Qureos Mentor

Ruby Labs

<div><h1 class="jobSectionHeader">About us</h1>
Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we're always looking for passionate individuals to join us. Learn more about our story at: https://rubylabs.com/about-us/<h1 class="jobSectionHeader">
About the role</h1>
We are looking for a highly meticulous PDF Forms Operations Specialist to own and scale the forms library for one of our core D2C subscription products. You will be fully responsible for sourcing, formatting, and publishing fillable PDF forms &mdash; tax, administrative, and business documents across multiple markets &mdash; used by hundreds of thousands of customers.
This is a hands-on, detail-driven role suited for someone who thrives on meticulous, repetitive work done to a consistently high standard. The operation is scaling its output 5&ndash;10x, and every form you ship is used by thousands of customers from day one. Sloppy fields, broken tab orders, and inconsistent formatting are not acceptable. The bar is high and so is the upside &mdash; performance here is directly and significantly rewarded, and strong operators take on bigger scope fast.<h1 class="jobSectionHeader">
Key Responsibilities</h1><h2 class="jobSectionHeader">
PDF Forms Preparation</h2><ul><li>
Source official forms (tax, administrative, business) across multiple countries and markets</li><li>
Format them into clean, fillable PDFs in Adobe Acrobat &mdash; field types, alignment, tab order, validations</li><li>
Ensure forms render correctly across desktop and mobile and behave consistently in the product editor</li><li>
Audit existing forms and continuously improve quality, fillability, and consistency</li></ul><h2 class="jobSectionHeader">
Content Library Management</h2><ul><li>
Upload and manage forms in the CMS with accurate categories, metadata, and discoverability</li><li>
Maintain a clean, well-organized library as output scales 5&ndash;10x</li><li>
Own quality checks before publication &mdash; every form ships correct the first time</li></ul><h2 class="jobSectionHeader">
Process &amp; Velocity</h2><ul><li>
Drive weekly output targets in a high-velocity production process</li><li>
Use AI tools to accelerate sourcing, formatting, and library operations</li><li>
Partner with the content and product teams to prioritize new forms based on market demand</li></ul><h1 class="jobSectionHeader">
Qualifications</h1><h2 class="jobSectionHeader">
Must-Have Experience</h2><ul><li>
2+ years in content operations, document operations, or a similar hands-on production role</li><li>
Hands-on expertise with Adobe Acrobat form preparation &mdash; field types, alignment, tab order, calculations, validations</li><li>
Experience working in a CMS &mdash; uploading, organizing, and managing structured content</li><li>
Proven track record of high-accuracy, high-volume production work</li><li>
Hands-on familiarity with AI tools (ChatGPT, Claude, or similar) to boost personal efficiency</li></ul><h2 class="jobSectionHeader">
Operating Attributes</h2><ul><li>
Extreme attention to detail &mdash; you catch what others miss, consistently</li><li>
Genuinely comfortable with repetitive, meticulous work &mdash; this is where you do your best work, not what you tolerate</li><li>
Self-directed &mdash; you drive your queue forward without needing constant direction</li><li>
Organized by default &mdash; large content libraries stay clean and structured under your ownership</li></ul><h1 class="jobSectionHeader">
Location</h1>
Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately &plusmn; 4 hours of CET. This ensures optimal collaboration and communication during working hours.<h1 class="jobSectionHeader">
Benefits</h1>
Discover the perks of being part of our vibrant team! We offer:<ul><li>
Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance.
</li><li>Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days.
</li><li>Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.
</li><li>Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them.
</li><li>Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here: https://docs.google.com/document/d/1nkrN76JlZkbKj9WSOhlT1_mni_CZeDkHdwfIjPXVwvk/preview?tab=t.0#heading=h.ndsdl4wapxtt</li></ul>
Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!<h1 class="jobSectionHeader">
Interview Process</h1>
After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps:<ul><li>
Recruiter Screening (40 minutes)</li><li>
Technical Interview (60 minutes)</li><li>
Final Interview (40 minutes)</li></ul><h1 class="jobSectionHeader">
Life at Ruby Labs</h1>
At Ruby Labs, we move fast, aim high, and expect the same from our team. We&rsquo;re not here to play small&mdash;we&rsquo;re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day.
This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you&rsquo;re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen.
Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more&mdash;more responsibility, more growth, and more success.
#LI-Remote</div>

PDF Forms Operations Specialist

<div><h1 class="jobSectionHeader">About us</h1>
Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we're always looking for passionate individuals to join us. Learn more about our story at: https://rubylabs.com/about-us/<h1 class="jobSectionHeader">
About the role</h1>
We are looking for an organised, proactive Project Manager / Product Owner to join a fast-moving product team. You will own the coordination layer across multiple teams, ensuring delivery runs smoothly, communication is clear, and nothing gets lost between teams.
This role is ideal for someone who enjoys building systems and is always looking for ways to make things work better.<h1 class="jobSectionHeader">
Key Responsibilities</h1><ul><li>
Maintain tasks and delivery tracking across teams &mdash; keeping everything visible, up to date, and clearly owned.</li><li>
Backlog management.</li><li>
Coordinate cross-functional handoffs and ensure smooth collaboration between product, engineering, QA, and other teams.</li><li>
Manage onboarding for new team members.</li><li>
Investigate and route incoming issues and escalations with the right context.</li><li>
Post regular team updates and summaries to keep everyone aligned.</li><li>
Identify process gaps and propose improvements.</li></ul><h1 class="jobSectionHeader">
Qualifications</h1><ul><li>
3+ years of experience in project management, product ownership, or operations in a tech company.</li><li>
Highly organised with a strong sense of ownership and follow-through.</li><li>
Proactive &mdash; you surface problems early and resolve them without being asked.</li><li>
Clear, concise communicator in writing.</li><li>
Able to manage multiple workstreams and stakeholders simultaneously.</li><li>
Fast learner who adapts quickly to new contexts and tools.</li><li>
Improvement-oriented &mdash; you regularly look for better ways to do things.</li></ul><h1 class="jobSectionHeader">
Nice to have</h1><ul><li>
Experience working across both product and growth teams.</li><li>
Background in a fast-scaling consumer or SaaS product.</li></ul><h1 class="jobSectionHeader">
Location</h1>
Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately &plusmn; 4 hours of CET. This ensures optimal collaboration and communication during working hours.<h1 class="jobSectionHeader">
Benefits</h1>
Discover the perks of being part of our vibrant team! We offer:<ul><li>
Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance.
</li><li>Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days.
</li><li>Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.
</li><li>Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them.
</li><li>Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here: https://docs.google.com/document/d/1nkrN76JlZkbKj9WSOhlT1_mni_CZeDkHdwfIjPXVwvk/preview?tab=t.0#heading=h.ndsdl4wapxtt</li></ul>
Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!<h1 class="jobSectionHeader">
Interview Process</h1>
After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps:<ul><li>
Recruiter Screening (40 minutes)</li><li>
Technical Interview (60 minutes)</li><li>
Final Interview (20 minutes)</li></ul><h1 class="jobSectionHeader">
Life at Ruby Labs</h1>
At Ruby Labs, we move fast, aim high, and expect the same from our team. We&rsquo;re not here to play small&mdash;we&rsquo;re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day.
This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you&rsquo;re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen.
Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more&mdash;more responsibility, more growth, and more success.
#LI-Remote</div>

Project Manager / Product Owner

<div><h1 class="jobSectionHeader">About us</h1>
Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we're always looking for passionate individuals to join us. Learn more about our story at: https://rubylabs.com/about-us/<h1 class="jobSectionHeader">
About the role</h1>
At Ruby Labs, we are building Direct-to-Consumer products in the AI category. We&rsquo;re looking for a Technical AI Product Manager to own and scale the integrations and connector ecosystem that powers our AI features &mdash; the third-party APIs, app integrations, and MCP (Model Context Protocol) servers that let our products reach beyond the model itself.
This is a high-ownership, technical role. Your core mandate is to scale connectors &mdash; growing the number, quality, and reliability of integrations available to our users &mdash; while making data-driven decisions about what to build, in what order, and how to measure success. You&rsquo;ll operate inside an AI engineering squad, working shoulder-to-shoulder with engineers on prompt systems, structured outputs, agentic workflows, and evaluation, and collaborating closely with product, growth, data, and billing teams.
We&rsquo;re looking for someone technical enough to read API docs and talk to engineers without a translator, who treats AI tools as a core part of their daily workflow, and who measures success in outcomes &mdash; not effort.<h1 class="jobSectionHeader">
Key Responsibilities</h1><ul><li>
Own and drive the roadmap for scaling the connector ecosystem, including the number, quality, and reliability of integrations (MCP servers, third-party APIs, and app integrations) that power AI features.</li><li>
Prioritise integrations and connectors based on user demand, business impact, and engineering effort.</li><li>
Write clear product specifications and acceptance criteria for new connectors, working closely with AI engineers.</li><li>
Define and own the framework for evaluating, onboarding, monitoring, and maintaining connectors over time.</li><li>
Translate AI capabilities, including LLM features, agentic workflows, and tool use, into clear, buildable product requirements.</li><li>
Partner with the AI engineering team on prompt systems, structured outputs, and evaluation pipelines, ensuring product requirements are reflected in technical design.</li><li>
Make pragmatic build-versus-buy decisions and define the scope of integration infrastructure.</li><li>
Own features end-to-end, from discovery and specification through QA, launch, and post-launch iteration.</li><li>
Define success metrics for connectors and AI features, including adoption, reliability, latency, cost, retention, and engagement impact.</li><li>
Design and run experiments and A/B tests, making ship, iterate, or kill decisions based on quantitative results.</li><li>
Build and maintain dashboards in Mixpanel and use observability tools such as Langfuse to monitor AI and connector performance and health.</li><li>
Surface actionable insights and recommendations to engineering and leadership teams on a regular cadence.</li><li>
Own and prioritise the integrations product backlog.</li><li>
Collaborate closely with AI engineering, growth, data, and billing teams to deliver initiatives reliably and on time.</li><li>
Communicate technical trade-offs, priorities, and roadmap decisions clearly to both technical and non-technical stakeholders.</li><li>
Use AI tools (Claude and others) as a core part of the daily workflow for prototyping, specification writing, analysis, and problem-solving.</li></ul><h1 class="jobSectionHeader">
Qualifications</h1><ul><li>
4+ years in product management, with a strong track record on technical, platform, API, or integration products.</li><li>
Demonstrated end-to-end ownership of products &mdash; from hypothesis through production and iteration.</li><li>
Solid technical fluency: comfortable reading API documentation, understanding data schemas and JSON, and partnering with engineers without needing everything translated.</li><li>
Practical understanding of how LLMs work and what modern AI products involve &mdash; prompts, structured outputs, agents / tool use, and their limitations.</li><li>
Working familiarity with the concepts behind MCP (Model Context Protocol), connectors, or integration / developer-platform products.</li><li>
Hands-on, daily use of AI tools (Claude or similar) for real work &mdash; this is how the team operates; it is not optional.</li><li>
Strong analytical skills and hands-on proficiency with a product analytics tool (Mixpanel preferred) &mdash; funnels, cohorts, and dashboards.</li><li>
Excellent communication and stakeholder-management skills, with comfort in a remote, asynchronous environment.</li></ul><h1 class="jobSectionHeader">
Nice to have</h1><ul><li>
Direct, hands-on experience with MCP &mdash; building, integrating, or shipping MCP servers or clients.</li><li>
Experience growing an integrations marketplace or connector ecosystem (scaling both breadth and reliability of third-party integrations).</li><li>
Experience with AI gateways / model routing (OpenRouter or similar) and LLM observability / evaluation tooling (Langfuse, LangSmith).</li><li>
Familiarity with the TypeScript / Node.js / Next.js ecosystem.</li><li>
Experience in a startup or fast-paced, high-iteration product environment.</li></ul><h1 class="jobSectionHeader">
Location</h1>
Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately &plusmn; 4 hours of CET. This ensures optimal collaboration and communication during working hours.<h1 class="jobSectionHeader">
Benefits</h1>
Discover the perks of being part of our vibrant team! We offer:<ul><li>
Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance.
</li><li>Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days.
</li><li>Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.
</li><li>Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them.
</li><li>Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here: https://docs.google.com/document/d/1nkrN76JlZkbKj9WSOhlT1_mni_CZeDkHdwfIjPXVwvk/preview?tab=t.0#heading=h.ndsdl4wapxtt</li></ul>
Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!<h1 class="jobSectionHeader">
Interview Process</h1>
After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps:<ul><li>
Recruiter Screening (40 minutes)</li><li>
Technical Interview (60 minutes)</li><li>
Second Interview (45 minutes)</li><li>
Final Interview (30 minutes)</li></ul><h1 class="jobSectionHeader">
Life at Ruby Labs</h1>
At Ruby Labs, we move fast, aim high, and expect the same from our team. We&rsquo;re not here to play small&mdash;we&rsquo;re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day.
This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you&rsquo;re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen.
Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more&mdash;more responsibility, more growth, and more success.
#LI-Remote</div>

Technical AI Product Manager

<div><h1 class="jobSectionHeader">About us</h1>
Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we're always looking for passionate individuals to join us. Learn more about our story at: https://rubylabs.com/about-us/<h1 class="jobSectionHeader">
About the role</h1>
At Ruby Labs we are looking for a Senior AI Engineer to own and drive the quality, reliability, and evolution of our AI systems in production.
This is a high-ownership role. You will be responsible for end-to-end delivery of major AI features, production stability of AI systems, and data-driven experimentation using tools like Langfuse, Mixpanel and OpenRouter. You&rsquo;ll work in a modern stack built on Next.js, TypeScript, Node.js, and Redis, collaborating closely with product, growth, data, and billing teams. Increasingly, this includes building agentic, tool-using AI systems &mdash; defining clean tool contracts (including MCP-based tools) and orchestrating how AI interacts with internal services and business systems.
Our engineering organization uses a squad-based structure. You will operate within an AI engineering squad, contributing as a senior technical voice and driving engineering quality within your area of the product.<h1 class="jobSectionHeader">
Key Responsibilities</h1><ul><li>
Take complete ownership and deliver major AI engineering features within agreed timelines.</li><li>
Own AI output quality, structure, and predictability across all user-facing AI interactions.</li><li>
Design, implement, and maintain output-type-based AI systems, including segmentation, routing, and enforcement.</li><li>
Ensure consistent output structure and formatting across different LLMs for the same request type.</li><li>
Integrate and orchestrate multiple LLM providers via OpenRouter, managing model selection, fallback strategies, and cost optimisations.</li><li>
Design and orchestrate tool-using and agentic AI workflows, defining clean tool contracts (including MCP-based tools), function-calling interfaces, and reliable AI-to-system integrations.</li><li>
Build and maintain complex, multi-step LLM workflows, including with orchestration frameworks such as LangChain or LlamaIndex, for advanced reasoning, context reuse, and retrieval.</li><li>
Design and manage production prompt systems with dynamic prompting, context injection, and conditional logic.</li><li>
Own the deployment and release of LLM experiments, prompt management, and Langfuse-based evaluation pipelines.</li><li>
Run A/B tests across models, analyse results, and present data-driven impact assessments of AI features and experiments.</li><li>
Monitor AI system metrics, quality signals, latency, and release health using Langfuse and other observability tools.</li><li>
Deep-debug complex LLM chains using Langfuse traces, identifying bottlenecks and optimising for cost, latency, and context-window usage, and build output-scoring systems to root-cause hallucinations and logic errors.</li><li>
Write clean, scalable, and maintainable TypeScript code across the Next.js and Node.js stack.</li><li>
Build reliable backend logic for AI systems, with strong error handling, request validation, fallback flows, and predictable behaviour in production, including reliable tool execution and AI-to-service integrations.</li><li>
Ensure high code quality through testing, code reviews, and clear engineering standards.</li><li>
Monitor, troubleshoot, and improve production performance, reliability, and system health.</li><li>
Drive maintainability and technical quality through solid architecture, refactoring, and disciplined release practices.</li></ul><h1 class="jobSectionHeader">
Qualifications</h1><ul><li>
6+ years of backend/full-stack software engineering experience, including production-grade TypeScript/Node.js. Experience with Next.js and/or Python is a plus.</li><li>
2+ years of experience building AI/LLM systems in production. Less experience may be considered for exceptional candidates.</li><li>
Deep hands-on experience working with LLM APIs (OpenAI, Anthropic, or similar) in production environments.</li><li>
Experience with Agentic AI, multi-agent orchestration, tool-based workflows (function calling/tool execution), and/or RAG pipelines, including indexing, retrieval, and re-ranking.</li><li>
Experience with LLM observability tools such as Langfuse, LangSmith, or similar platforms.</li><li>
Experience with AI gateways and model routing solutions, such as OpenRouter or equivalent technologies.</li><li>
Solid understanding of Redis and relational databases, such as PostgreSQL.</li><li>
Exceptional ownership mindset and personal responsibility for engineering quality and delivery.</li></ul><h1 class="jobSectionHeader">
Nice to have</h1><ul><li>
Experience with AI-centered development tools such as Cursor, Claude Code, Windsurf, or similar platforms.</li><li>
Familiarity with evaluation frameworks, including LLM-as-a-judge, RAGAS, or similar approaches.</li><li>
Experience working in high-pressure startup environments with rapid product iteration cycles.</li><li>
Experience with MCP (Model Context Protocol), including building MCP servers/clients or designing tool contracts for AI agents.</li><li>
Experience with edge and serverless runtimes, such as Cloudflare Workers, and supporting services including KV, Durable Objects, Queues, R2, and D1.</li><li>
Experience with payments, billing and checkout flows, or orchestration platforms.</li><li>
Practical experience fine-tuning models for domain-specific tasks or achieving strict JSON/schema compliance.</li><li>
Working proficiency in Python for data science, evaluation scripts, or AI tooling.</li></ul><h1 class="jobSectionHeader">
Location</h1>
Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately &plusmn; 4 hours of CET. This ensures optimal collaboration and communication during working hours.<h1 class="jobSectionHeader">
Benefits</h1>
Discover the perks of being part of our vibrant team! We offer:<ul><li>
Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance.
</li><li>Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days.
</li><li>Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.
</li><li>Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them.
</li><li>Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here: https://docs.google.com/document/d/1tzxGX4Uu7Ts_HCLFXESKLnKaaBfVCPf1f9AYZPrkjJM/preview?tab=t.0</li></ul>
Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!<h1 class="jobSectionHeader">
Interview Process</h1>
After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps:<ul><li>
Recruiter Screening (40 minutes)</li><li>
Technical Interview (60 minutes)</li><li>
Second Interview (30 minutes)</li><li>
Final Interview (20 minutes)</li></ul><h1 class="jobSectionHeader">
Life at Ruby Labs</h1>
At Ruby Labs, we move fast, aim high, and expect the same from our team. We&rsquo;re not here to play small&mdash;we&rsquo;re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day.
This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you&rsquo;re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen.
Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more&mdash;more responsibility, more growth, and more success.
#LI-Remote</div>

Senior AI Engineer

<div><h1 class="jobSectionHeader">About us</h1>
Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we're always looking for passionate individuals to join us. Learn more about our story at: https://rubylabs.com/about-us/<h1 class="jobSectionHeader">
About the role</h1>
At Ruby Labs we are looking for a Senior AI Engineer to own and drive the quality, reliability, and evolution of our AI systems in production.
This is a high-ownership role. You will be responsible for end-to-end delivery of major AI features, production stability of AI systems, and data-driven experimentation using tools like Langfuse, Mixpanel and OpenRouter. You&rsquo;ll work in a modern stack built on Next.js, TypeScript, Node.js, and Redis, collaborating closely with product, growth, data, and billing teams. Increasingly, this includes building agentic, tool-using AI systems &mdash; defining clean tool contracts (including MCP-based tools) and orchestrating how AI interacts with internal services and business systems.
Our engineering organization uses a squad-based structure. You will operate within an AI engineering squad, contributing as a senior technical voice and driving engineering quality within your area of the product.<h1 class="jobSectionHeader">
Key Responsibilities</h1><ul><li>
Take complete ownership and deliver major AI engineering features within agreed timelines.</li><li>
Own AI output quality, structure, and predictability across all user-facing AI interactions.</li><li>
Design, implement, and maintain output-type-based AI systems, including segmentation, routing, and enforcement.</li><li>
Ensure consistent output structure and formatting across different LLMs for the same request type.</li><li>
Integrate and orchestrate multiple LLM providers via OpenRouter, managing model selection, fallback strategies, and cost optimisations.</li><li>
Design and orchestrate tool-using and agentic AI workflows, defining clean tool contracts (including MCP-based tools), function-calling interfaces, and reliable AI-to-system integrations.</li><li>
Build and maintain complex, multi-step LLM workflows, including with orchestration frameworks such as LangChain or LlamaIndex, for advanced reasoning, context reuse, and retrieval.</li><li>
Design and manage production prompt systems with dynamic prompting, context injection, and conditional logic.</li><li>
Own the deployment and release of LLM experiments, prompt management, and Langfuse-based evaluation pipelines.</li><li>
Run A/B tests across models, analyse results, and present data-driven impact assessments of AI features and experiments.</li><li>
Monitor AI system metrics, quality signals, latency, and release health using Langfuse and other observability tools.</li><li>
Deep-debug complex LLM chains using Langfuse traces, identifying bottlenecks and optimising for cost, latency, and context-window usage, and build output-scoring systems to root-cause hallucinations and logic errors.</li><li>
Write clean, scalable, and maintainable TypeScript code across the Next.js and Node.js stack.</li><li>
Build reliable backend logic for AI systems, with strong error handling, request validation, fallback flows, and predictable behaviour in production, including reliable tool execution and AI-to-service integrations.</li><li>
Ensure high code quality through testing, code reviews, and clear engineering standards.</li><li>
Monitor, troubleshoot, and improve production performance, reliability, and system health.</li><li>
Drive maintainability and technical quality through solid architecture, refactoring, and disciplined release practices.</li></ul><h1 class="jobSectionHeader">
Qualifications</h1><ul><li>
6+ years of backend/full-stack software engineering experience, including production-grade TypeScript/Node.js. Experience with Next.js and/or Python is a plus.</li><li>
2+ years of experience building AI/LLM systems in production. Less experience may be considered for exceptional candidates.</li><li>
Deep hands-on experience working with LLM APIs (OpenAI, Anthropic, or similar) in production environments.</li><li>
Experience with Agentic AI, multi-agent orchestration, tool-based workflows (function calling/tool execution), and/or RAG pipelines, including indexing, retrieval, and re-ranking.</li><li>
Experience with LLM observability tools such as Langfuse, LangSmith, or similar platforms.</li><li>
Experience with AI gateways and model routing solutions, such as OpenRouter or equivalent technologies.</li><li>
Solid understanding of Redis and relational databases, such as PostgreSQL.</li><li>
Exceptional ownership mindset and personal responsibility for engineering quality and delivery.</li></ul><h1 class="jobSectionHeader">
Nice to have</h1><ul><li>
Experience with AI-centered development tools such as Cursor, Claude Code, Windsurf, or similar platforms.</li><li>
Familiarity with evaluation frameworks, including LLM-as-a-judge, RAGAS, or similar approaches.</li><li>
Experience working in high-pressure startup environments with rapid product iteration cycles.</li><li>
Experience with MCP (Model Context Protocol), including building MCP servers/clients or designing tool contracts for AI agents.</li><li>
Experience with edge and serverless runtimes, such as Cloudflare Workers, and supporting services including KV, Durable Objects, Queues, R2, and D1.</li><li>
Experience with payments, billing and checkout flows, or orchestration platforms.</li><li>
Practical experience fine-tuning models for domain-specific tasks or achieving strict JSON/schema compliance.</li><li>
Working proficiency in Python for data science, evaluation scripts, or AI tooling.</li></ul><h1 class="jobSectionHeader">
Location</h1>
Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately &plusmn; 4 hours of CET. This ensures optimal collaboration and communication during working hours.<h1 class="jobSectionHeader">
Benefits</h1>
Discover the perks of being part of our vibrant team! We offer:<ul><li>
Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance.
</li><li>Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days.
</li><li>Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.
</li><li>Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them.
</li><li>Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here: https://docs.google.com/document/d/1tzxGX4Uu7Ts_HCLFXESKLnKaaBfVCPf1f9AYZPrkjJM/preview?tab=t.0</li></ul>
Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!<h1 class="jobSectionHeader">
Interview Process</h1>
After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps:<ul><li>
Recruiter Screening (40 minutes)</li><li>
Technical Interview (60 minutes)</li><li>
Second Interview (30 minutes)</li><li>
Final Interview (20 minutes)</li></ul><h1 class="jobSectionHeader">
Life at Ruby Labs</h1>
At Ruby Labs, we move fast, aim high, and expect the same from our team. We&rsquo;re not here to play small&mdash;we&rsquo;re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day.
This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you&rsquo;re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen.
Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more&mdash;more responsibility, more growth, and more success.
#LI-Remote</div>

Senior AI Software Engineer