backend software engineer (node.js / ruby on rails)

full stack developer

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backend software engineer (node.js / ruby on rails) Jobs in Karachi

backend software engineer node js ruby on rails

CareCloud

Job SummaryWe are seeking a talented and motivated Node.js / Ruby on Rails Developer with 3+ years of professional experience to join our engineering team. The ideal candidate should have hands-on experience in building scalable web applications, developing RESTful APIs, integrating third-party services, and working in an agile development environment. The candidate will collaborate with cross-functional teams to design, develop, test, and maintain high-quality software solutions.Key Responsibilities<ul><li>Design, develop, and maintain scalable backend applications using Node.js and/or Ruby on Rails.</li><li>Build and maintain RESTful APIs and backend services.</li><li>Develop secure, high-performance, and maintainable applications.</li><li>Integrate third-party APIs and external services.</li><li>Optimize application performance, scalability, and reliability.</li><li>Write clean, reusable, and well-documented code following best practices.</li><li>Participate in code reviews and ensure coding standards are maintained.</li><li>Troubleshoot, debug, and resolve production issues.</li><li>Work closely with Product Managers, QA Engineers, and Frontend Developers.</li><li>Participate in sprint planning, estimation, and agile ceremonies.</li><li>Stay updated with emerging technologies and recommend improvements.</li></ul>Required Qualifications<ul><li>Bachelor's degree in Computer Science, Software Engineering, or a related field.</li><li>3+ years of professional experience in backend development using Node.js and/or Ruby on Rails.</li><li>Strong understanding of JavaScript (ES6+) and asynchronous programming.</li><li>Experience with Express.js or similar Node.js frameworks.</li><li>Strong knowledge of Ruby on Rails architecture, MVC pattern, and Active Record.</li><li>Experience designing and consuming RESTful APIs.</li><li>Strong understanding of relational databases such as PostgreSQL or MySQL.</li><li>Experience with Git version control.</li><li>Familiarity with authentication mechanisms such as JWT and OAuth.</li><li>Understanding of software design patterns and clean coding principles.</li><li>Experience working in Agile/Scrum environments.</li><li>Strong analytical and problem-solving skills.</li></ul>Preferred Skills<ul><li>Experience with Docker and containerized applications.</li><li>Knowledge of Redis, Sidekiq, or background job processing.</li><li>Familiarity with AWS, Azure, or Google Cloud Platform.</li><li>Experience with CI/CD pipelines.</li><li>Understanding of GraphQL is a plus.</li><li>Experience with unit and integration testing frameworks.</li><li>Exposure to microservices architecture.</li></ul>Pay: From Rs100,000.00 per monthWork Location: In person

Backend Software Engineer (Node.js / Ruby on Rails)

MarketCube.io

Full Stack Developer (Node.js / React / GraphQL)Location: Karachi, Pakistan (On-site)About the Role:Market Cube is looking for an experienced Full Stack Developer to join our growing engineering team in Karachi. This is a hands-on role where you'll design, build and maintain scalable applications across multiple products, working with modern technologies including Node.js, React, GraphQL and Shopify.You'll work closely with the product and engineering teams to deliver high-quality software, solve complex technical challenges, and help mentor other developers.Key Responsibilities<ul><li>Design, develop and maintain scalable backend services using Node.js.</li><li>Build modern, responsive web applications using React.</li><li>Develop and maintain REST and GraphQL APIs.</li><li>Build and support Shopify integrations using the GraphQL Admin API, Webhooks, App Bridge and Polaris.</li><li>Develop business-critical functionality, including commission calculations, order splitting and payout logic, ensuring accuracy and reliability.</li><li>Contribute to multiple products across the Market Cube portfolio as business priorities evolve.</li><li>Troubleshoot production issues, resolve bugs, optimise application performance and investigate data-related problems.</li><li>Participate in code reviews and promote engineering best practices.</li><li>Mentor and support mid-level software engineers.</li></ul>Essential Requirements<ul><li>Minimum 5 years' professional software development experience.</li><li>Strong commercial experience with Node.js and JavaScript/TypeScript.</li><li>Strong experience building applications with React.</li><li>Experience designing and optimising PostgreSQL or MySQL databases, including schema design, indexing and query optimisation.</li><li>Experience developing REST APIs, GraphQL APIs, webhooks and asynchronous processing/queues.</li><li>Experience working across multiple applications, codebases or products.</li><li>Ability to translate business requirements into technical solutions with minimal supervision.</li><li>Strong analytical, problem-solving and debugging skills.</li><li>Excellent communication skills and the ability to collaborate within a cross-functional team.</li></ul>Desirable Skills<ul><li>Shopify app development experience.</li><li>E-commerce or multi-tenant SaaS experience.</li><li>Experience with AWS.</li><li>Docker and containerised application development.</li><li>CI/CD pipelines and automated deployment practices.</li></ul>What We Offer<ul><li>Opportunity to work on multiple innovative products using modern technologies.</li><li>A collaborative, supportive and highly skilled engineering team.</li><li>Exposure to challenging technical projects and real business impact.</li><li>Career progression and professional development opportunities.</li></ul>LocationThis is a full-time, on-site position based in Karachi, Pakistan.How to ApplyPlease send the following to Ali.haider@marketcube.io:<ul><li>Your CV.</li><li>Your GitHub profile (or a portfolio of relevant work).</li></ul>Applications submitted without a GitHub profile or relevant portfolio may not be considered.Job Type: Full-timeExperience:<ul><li>React, Node Js, Full Stack Development: 4 years (Required)</li></ul>Work Location: In person

Full Stack Developer (Node.js / React / GraphQL)

HR Ways

Hiring SysOps Engineer from Karachi | Oniste OpportuntyAbout client:﻿﻿A lead financial investment company based in Los Angeles providing regulatory technology software solutions to the financial sector multiple industries.﻿Role Overview &ndash; SysOps EngineerWe are looking for a reliable and experienced SysOps Engineer to support Finchor's technical operations.The purpose of this role is to reduce dependency on one person, create stronger technical backup, and support the business as it moves towards wider operational coverage.This is a hands-on role focused on infrastructure, APIs, trading platform integrations, CRM integrations, payment processor integrations, DNS/domain management, frontend/backend connectivity, and email delivery services.Key Responsibilities:<ul><li>Maintain the AWS environment, including RDS, S3, Lambda, and IAM policies/user access.</li><li>Build, secure, and maintain backend APIs.</li><li>Ensure reliable connectivity between backend APIs and the frontend application.</li><li>Manage DNS configurations and security settings through Cloudflare.</li><li>Support domain transitions and ongoing domain management.</li><li>Manage custom page redirections on the WordPress website.</li><li>Maintain the integration layer between the frontend and backend APIs.</li><li>Act as the technical point of contact for third-party trading platforms, CRM providers, and payment processors.</li><li>Configure and monitor data flow between external platforms and internal systems.</li><li>Manage and optimise SMTP services through SendGrid for reliable system email delivery.</li><li>Communicate clearly with the Director, internal team members, and external technical providers</li></ul>Requirements:<ul><li>Mid to senior-level experience in SysOps, DevOps, infrastructure support, or technical operations.</li><li>Strong experience with AWS, especially RDS, S3, Lambda, and IAM.</li><li>Experience building, securing, and maintaining backend APIs.</li><li>Good understanding of frontend/backend connectivity.</li><li>Experience with Cloudflare, DNS, domain management, and domain transitions.</li><li>Experience with SMTP/email delivery services such as SendGrid.</li><li>Experience with trading platforms, CRM systems, payment processors, or similar third party integrations.</li><li>Excellent English, both written and spoken.</li><li>Strong ownership mindset and ability to work independently.</li><li>Strong problem-solving and troubleshooting skills.</li><li>Good communication skills with internal teams and external providers.</li></ul>Nice to Have<ul><li>Experience in FinTech, RegTech, brokerage, trading, or financial services software.</li><li>WordPress technical maintenance experience.</li><li>Previous experience supporting shift-based, extended-hours, or round-the-clock operations.</li></ul>Other Details:Working days: Monday to Friday (1 day WFH) ﻿Working Timings: 10:00 to 06:00 ﻿Work Mode: Onsite ﻿Location: ﻿Gulshan-E-Iqbal,Kda Scheme,KarachiAbout HR Ways:HR Ways is an Award winning Technical Recruitment Firm helping software houses and IT Product companies internationally and locally to find IT Talent. HR Ways is engaged by 300+ Employers worldwide ranging from worlds biggest SaaS Companies to most competitive Startups. We have entities in Dubai, Canada, US, UK, Pakistan, India, Saudi Arabia, Portugal, Brazil and other parts of the world. Join our Whatsapp Channelhttps://whatsapp.com/channel/0029VamSiLr5fM5fMtAdCS2M﻿ to stay updated or visit www.hrways.co to know more.&quot;Pay: Rs29,911.44 - Rs180,416.44 per monthWork Location: Hybrid remote in Karachi Gulshan-E-Iqbal

Infrastructure Support Engineer

IBL UNISYS

DevOps Engineer (Backend Engineer)Location: Karachi, PakistanJob Type: Full-Time | PermanentNo. of Positions: 01About IBL-Unisys:IBL-Unisys, part of the IBL Group of Companies, has been a market leader in Pakistan for over a century. Specializing in the distribution, marketing, and manufacturing of global brands, we have expanded our portfolio into cutting-edge technology solutions. As a premier IT services provider, IBL-Unisys partners with globally renowned companies to deliver innovative and reliable technology solutions to our clients.Role Summary: As a Backend Engineer (Backend &amp; DevOps), you will be responsible for designing, developing, and maintaining scalable backend systems and cloud-based infrastructure. The role involves working closely with development operations and product teams to ensure seamless deployment, reliability, and high performance.You will take ownership of backend architecture, CI/CD pipelines, cloud deployment, and performance optimization of business-critical applications.Key Responsibilities:Backend Development<ul><li>Design and develop scalable, secure, and high-performance backend systems.</li><li>Build RESTful APIs and microservices architectures.</li><li>Implement authentication, authorization (JWT/OAuth), and security best practices.</li><li>Ensure code quality, testing, and maintainability.</li></ul>DevOps &amp; Infrastructure (Core Requirement)<ul><li>Design and maintain CI/CD pipelines.</li><li>Deploy and manage applications using Docker and containerized environments.</li><li>Work with Linux-based production servers.</li><li>Configure and manage web servers (Nginx, Apache).</li><li>Automate deployments and server configurations.</li><li>Monitor system performance, logs, and uptime.</li><li>Handle production issues and root cause analysis.</li></ul>Cloud &amp; Scalability<ul><li>Deploy and manage infrastructure on AWS / Azure / GCP.</li><li>Manage services such as EC2, S3, RDS, Lambda, App Services, etc.</li><li>Implement Infrastructure as Code (Terraform preferred).</li><li>Ensure scalability, load balancing, and high availability.</li><li>Optimize cost and resource utilization.</li></ul>Database &amp; Performance<ul><li>Design and optimize databases (MySQL, PostgreSQL, MongoDB).</li><li>Implement caching mechanisms (Redis, Memcached).</li><li>Optimize queries and backend performance.</li><li>Maintain database security and backups.</li></ul>Requirements:<ul><li>Bachelor&rsquo;s or Master&rsquo;s degree in Computer Science, Software Engineering, or a related field.</li><li>5+ years of professional backend development experience.</li><li>Strong expertise in Node.js (Express.js/NestJS) or PHP (Laravel).</li><li>Strong understanding of REST APIs, microservices, and backend architecture.</li><li>Hands-on experience in DevOps and cloud deployment.</li><li>Strong knowledge of Git and version control workflows.</li><li>Experience working in Agile/Scrum environments.</li></ul>Work Location: In person

DevOps (Backend Engineer)

Qualix Solutions

Location: PECHS, Karachi, Pakistan (Onsite) - Afternoon shiftEmployment Type: Full-timeExperience: 2-5 years of professional software development, including at least 1 year building AI or LLM-powered featuresAbout the RoleQualix Solutions builds AI-powered products, and we're looking for a mid-level engineer who is strong on the backend, hands-on with agentic AI development, and has a genuine eye for good UI. You'll work on features end to end: designing APIs and data models, orchestrating LLM-driven agentic workflows, and shipping interfaces that feel clean and intuitive. Our backend work spans both Python and Node.js/NestJS, so strength in either is a great fit.This is a role for someone who thrives in ambiguity. Requirements won't always arrive fully formed. We expect you to ask the right questions, propose a direction, and turn vague problems into clear, working software.What You'll Do<ul><li>Design and build backend services and REST APIs in Python (FastAPI, Django, or Flask), or Node.js (NestJS)</li><li>Build agentic AI features: tool calling, multi-step workflows, LLM orchestration, and integrations with model APIs (Claude, OpenAI, etc.)</li><li>Implement authentication and authorization (JWT / OAuth), input validation, and error handling</li><li>Design database schemas and write efficient queries (PostgreSQL and/or MongoDB), including indexing and performance tuning</li><li>Build and refine frontend features in React with attention to layout, spacing, and usability</li><li>Take loosely defined problems, clarify scope with stakeholders, and deliver well-scoped solutions</li><li>Debug issues across the stack and participate in code reviews</li><li>Collaborate with designers, engineers, and product stakeholders</li></ul>What We're Looking ForBackend (Strong):<ul><li>Strong proficiency in either Python (FastAPI, Django, or Flask) or Node.js/TypeScript (NestJS): REST APIs, modules/services, typing, validation, and error handling. You only need one; comfort in both is a plus</li><li>Deep understanding of backend fundamentals: API design, authentication, caching, background jobs, error handling, and logging</li><li>Databases: schema design, indexing, and query optimization in PostgreSQL or MongoDB</li><li>API security: input validation, basic XSS / CSRF awareness</li></ul>Agentic AI:<ul><li>Hands-on experience building agentic systems: tool use / function calling, multi-step agent workflows, and prompt design</li><li>Experience integrating LLM APIs (Anthropic, OpenAI, or similar) into production features</li><li>Familiarity with frameworks such as LangChain, LangGraph, or the Claude Agent SDK, or equivalent custom orchestration</li></ul>Frontend and UI:<ul><li>React: hooks, functional components, state management (Redux or Zustand)</li><li>Tailwind CSS or equivalent, responsive layouts (Flexbox, CSS Grid)</li><li>A strong sense of good UI design: you notice bad spacing, confusing flows, and inconsistent components, and you fix them</li></ul>Ways of Working:<ul><li>Comfortable working with ambiguity and driving toward clarity</li><li>Excellent verbal and written English communication</li><li>Problem-solving mindset and attention to detail</li></ul>Nice to Have<ul><li>Next.js (SSR, SSG, API routes)</li><li>Vector databases and RAG pipelines (e.g., pgvector, Pinecone, Weaviate)</li><li>Docker basics and cloud exposure (AWS / Azure / GCP)</li><li>CI/CD awareness</li><li>Bachelor's degree in Computer Science or a related field</li></ul>Job Type: Full-timeApplication Question(s):<ul><li>Why do you want to switch?</li><li>What is your current salary?</li><li>What is your expected salary?</li><li>Is your expected salary negotiable?</li><li>What is your notice period?</li><li>Rate your English speaking skills from 1 (Novice) to 10 (Expert)?</li></ul>Experience:<ul><li>Development: 2 years (Preferred)</li></ul>Work Location: In person

Full Stack Software Engineer - Strong backend

LN Technologies

We are looking for a Mid level .NET Core developer with strong experience in ASP.NET Core, Blazor/Razor, and ABP Framework(PLUS), capable of building secure, data-driven applications, including dashboards, analytics, and reporting features.Required Skills &amp; Qualifications:1. Backend Application Development<ul><li>Design, develop, and maintain enterprise-grade web applications using C#, .NET Core, and ASP.NET Core.</li><li>Develop scalable RESTful APIs following industry best practices.</li><li>Build secure and high-performance backend services using Entity Framework Core and SQL Server.</li><li>Develop and maintain Razor Pages and MVC applications.</li><li>Optimize application performance, scalability, and reliability.</li></ul>2. Frontend Development<ul><li>Develop responsive and interactive user interfaces using Angular (TypeScript).</li><li>Build and maintain Razor MVC applications.</li><li>Implement dynamic client-side functionality using JavaScript (ES6+), AJAX/Fetch API, and jQuery where required.</li><li>Develop dashboards, reports, and analytics using modern charting libraries.</li><li>Ensure cross-browser compatibility and responsive design.</li></ul>3. Cloud &amp; Microservices Development<ul><li>Develop and deploy applications on Microsoft Azure.</li><li>Design and implement cloud-native and microservices-based solutions.</li><li>Integrate cloud services to improve scalability, availability, and performance.</li><li>Participate in cloud deployment, monitoring, and optimization activities.</li></ul>4. Database &amp; API Management<ul><li>Design and optimize SQL Server databases.</li><li>Implement data access using Entity Framework Core.</li><li>Develop secure, versioned RESTful APIs.</li><li>Optimize database queries and improve application performance.</li><li>Ensure data integrity and application reliability.</li></ul>6. Code Quality &amp; Best Practices<ul><li>Write clean, reusable, and maintainable code.</li><li>Perform code reviews and ensure adherence to development standards.</li><li>Troubleshoot, debug, and resolve complex technical issues.</li><li>Participate in sprint planning, estimation, and Agile ceremonies.</li><li>Continuously improve application quality through testing and optimization.</li></ul>7. Collaboration &amp; Technical Support<ul><li>Work closely with Business Analysts, UI/UX Designers, QA Engineers, and Project Managers.</li><li>Translate business requirements into technical solutions.</li><li>Provide technical guidance and support to junior developers.</li><li>Collaborate with cross-functional teams to deliver high-quality software solutions.</li></ul>8. Documentation &amp; Continuous Improvement<ul><li>Prepare and maintain technical documentation.</li><li>Document APIs, database structures, and system architecture.</li><li>Stay current with emerging Microsoft technologies and development trends.</li><li>Recommend improvements to development processes and application architecture.</li></ul>Required Qualifications<ul><li>Bachelor's degree in Computer Science, Software Engineering, or a related field.</li><li>3+ years of professional experience in .NET application development.</li><li>Strong expertise in C#, .NET Core, ASP.NET Core, MVC, and Razor Pages.</li><li>Experience with Microsoft Azure Cloud Services.</li><li>Strong understanding of Microservices Architecture.</li><li>Experience developing RESTful APIs.</li><li>Hands-on experience with Entity Framework Core and SQL Server.</li><li>Strong experience with Angular (TypeScript).</li><li>Proficiency in JavaScript (ES6+), AJAX/Fetch API, jQuery, DOM manipulation, and event handling.</li><li>Experience developing dashboards, analytics, and reporting modules.</li><li>Strong understanding of secure application development and software design principles.</li><li>Excellent analytical, debugging, and problem-solving skills.</li><li>Strong communication and collaboration skills.</li><li>Develop scalable RESTful APIs following industry best practices.</li><li>Build secure and high-performance backend services using Entity Framework Core and SQL Server.</li><li>Develop and maintain Razor Pages and MVC applications.</li><li>Optimize application performance, scalability, and reliability.</li></ul>Job Type: Full-timeApplication Question(s):<ul><li>How many years of experience do you have working with .NET Core development?</li><li>How many years of experience do you have working with MVC development?</li><li>Have you worked on EntityFramework Core?</li><li>Have you worked on JavaScript (ES6+)?</li><li>Have you worked on jQuery (legacy &amp; integration scenarios)?</li><li>Have you worked on Chart libraries for analytics?</li><li>Have you implemented Architecture &amp; Design Patterns?</li><li>Do you have experience with Blazor and Razor Pages for building dashboards or data-driven UIs?</li><li>What is your current salary?</li><li>What is your expected salary?</li><li>How soon you can join us?</li></ul>Work Location: In person

Dot Net Developer (Mid Level)

RIKSOF (Private) Limited

RIKSOF is an award-winning agency building AI-enabled solutions for mobile, web and IoT projects.We are currently on the lookout for highly motivated QA &amp; Test Automation Engineer with 3 years of post-graduate experience. In this role, you should be able to work in a challenging environment with seniors.You should have excellent personal, organizational and problem-solving skills.Successful candidates will have the opportunity to work on high visibility and technically complex projects.<ul><li>Ensuring high quality in the software we build through the use of test automation.</li><li>Research and implementation of the latest trends and technologies in Agile development.</li><li>Programming of system and UI test cases.</li><li>Performance and Security Testing</li><li>Writing clear, concise and comprehensive test plans and test cases</li><li>Ensuring project deadlines are met</li></ul>Desired Languages: Javascript or TypescriptRequirements:<ul><li>Proven work experience in software quality assurance</li><li>Knowledge about puppeteer and jenkins.</li><li>Strong knowledge of software QA methodologies, tools and processes</li><li>BS/MS degree in Computer Science</li></ul>Compensation &amp; Benefits<ul><li>Fuel allowance.</li><li>18 annual holidays.</li><li>Employee Old-Age Benefit (EOBI).</li><li>Casual, friendly environment.</li></ul>Pay: Up to Rs100,000.00 per monthWork Location: In person

QA & Test Automation Engineer

Explore 290+ Backend software engineer node js ruby on rails in Karachi this August. Find roles across top companies and apply now to boost your career.