fullstack engineer

Tether Operations Limited

<div>Join Tether and Shape the Future of Digital Finance
At Tether, we&rsquo;re not just building products, we&rsquo;re pioneering a global financial revolution. Our cutting-edge solutions empower businesses&mdash;from exchanges and wallets to payment processors and ATMs&mdash;to seamlessly integrate reserve-backed tokens across blockchains. By harnessing the power of blockchain technology, Tether enables you to store, send, and receive digital tokens instantly, securely, and globally, all at a fraction of the cost. Transparency is the bedrock of everything we do, ensuring trust in every transaction.
Innovate with Tether
Tether Finance: Our innovative product suite features the world&rsquo;s most trusted stablecoin, USDT, relied upon by hundreds of millions worldwide, alongside pioneering digital asset tokenization services.
But that&rsquo;s just the beginning:
Tether Power: Driving sustainable growth, our energy solutions optimize excess power for Bitcoin mining using eco-friendly practices in state-of-the-art, geo-diverse facilities.
Tether Data: Fueling breakthroughs in AI and peer-to-peer technology, we reduce infrastructure costs and enhance global communications with cutting-edge solutions like KEET, our flagship app that redefines secure and private data sharing.
Tether Education: Democratizing access to top-tier digital learning, we empower individuals to thrive in the digital and gig economies, driving global growth and opportunity.
Tether Evolution: At the intersection of technology and human potential, we are pushing the boundaries of what is possible, crafting a future where innovation and human capabilities merge in powerful, unprecedented ways.
Why Join Us?
Our team is a global talent powerhouse, working remotely from every corner of the world. If you&rsquo;re passionate about making a mark in the fintech space, this is your opportunity to collaborate with some of the brightest minds, pushing boundaries and setting new standards. We&rsquo;ve grown fast, stayed lean, and secured our place as a leader in the industry.
If you have excellent English communication skills and are ready to contribute to the most innovative platform on the planet, Tether is the place for you.
Are you ready to be part of the future?
About the job:
You'll work across the JavaScript and TypeScript layer of our local AI stack. Depending on the project, you might build user-facing applications (mobile or desktop) or contribute to the platform layer that bridges our C++ inference engines with the app ecosystem. Whether you're crafting polished product experiences or building the SDKs and bindings that other developers rely on, you'll be helping make local AI truly usable.
You&rsquo;ll be contributing to QVAC, our local AI stack built to bring fast, private AI directly to user devices.
This role suits engineers who thrive in a full-stack JS environment and enjoy working close to both product and platform to turn powerful AI capabilities into real-world applications.
Responsibilities
<ul><li>Own React (Expo/Electron) app development with clean, modular architecture</li><li>
Build UI using modern React stack (TypeScript, RN Navigation, Zustand/Recoil/Jotai)</li><li>
Implement local first / local only apps</li><li>
Integrate mobile apps with distributed systems, local inference, and p2p layers</li><li>
Strong experience with REST/WebSockets, async flows, and secure data storage</li><li>
Ability to build native modules (iOS/Android) when needed (with some help)</li><li>
Good understanding of offline-first systems, caching, and performance</li><li>
Comfortable integrating SDKs (payments, crypto, AI models, etc.)</li><li>
Write reliable code: unit tests, E2E tests (Maestro/Appium/Playwright)</li><li>
Experience with TypeScript across stack (frontend + backend)</li><li>
Bonus: experience with distributed/P2P APIs, on-device ML, cryptography</li></ul><ul><li>
5+ years of experience in Fullstack development</li><li>
Expert-level proficiency in Node.js/JavaScript for backend development and React frontend framework</li><li>
Experience with performant data handling on constrained devices (via SQLite or similar)</li><li>
Proven experience building and scaling distributed systems or event-driven architectures</li><li>
Experience with containerization technologies (Docker) and orchestration platforms (Kubernetes)</li><li>
Proficiency with databases, and a deep understanding of data modeling and optimization</li><li>
Solid understanding of networking, security principles, and best practices for production systems</li><li>
Experience with real-time data streaming and RPC implementations</li><li>
Ability to work independently in a remote environment and communicate effectively across time zones</li></ul>
Nice to have:<ul><li>
Experience with peer-to-peer technologies (Hyperswarm, libp2p, WebRTC) or similar distributed communication protocols</li><li>
Familiarity with AI/ML inference APIs and OpenAI-compatible endpoints</li><li>
Previous experience building AI SaaS or PaaS platforms</li><li>
Knowledge of GPU resource management and ML framework infrastructure</li><li>
Understanding of WebAssembly or edge computing paradigms</li><li>
Contributions to open-source projects in relevant domains</li></ul>
Important information for candidates 
Recruitment scams have become increasingly common. To protect yourself, please keep the following in mind when applying for roles:<ul><li>
Apply only through our official channels. We do not use third-party platforms or agencies for recruitment unless clearly stated. All open roles are listed on our official careers page: https://tether.recruitee.com/</li><li>
Verify the recruiter&rsquo;s identity. All our recruiters have verified LinkedIn profiles. If you&rsquo;re unsure, you can confirm their identity by checking their profile or contacting us through our website.</li><li>
Be cautious of unusual communication methods. We do not conduct interviews over WhatsApp, Telegram, or SMS. All communication is done through official company emails and platforms.</li><li>
Double-check email addresses. All communication from us will come from emails ending in @tether.to or @tether.io</li><li>
We will never request payment or financial details. If someone asks for personal financial information or payment at any point during the hiring process, it is a scam. Please report it immediately.</li></ul>
When in doubt, feel free to reach out through our official website.</div>

Senior Fullstack Engineer

Lumenalta

<div>
 
 
 Evergreen Role &ndash; Talent Pipeline
 
 
 
 This is an evergreen role. We continuously meet talented engineers to support upcoming client projects. While there may not be an immediate opening, qualified candidates may be considered for future engagements.
 
 
 
 
 
 
 With over 20 years of fully remote experience, Lumenalta offers:
 
 
 <ul>
 <li>
 Fully remote work
 </li>
 <li>
 Rapid growth opportunities
 </li>
 <li>
 Self-Improvement
 </li>
 <li>
 Industry-leading clients
 </li>
 <li>
 Nurturing engineers&rsquo; career paths
 </li>
 </ul>
 
 
 
 
 
 What You Will Work On
 
 
 <ul>
 <li>
 Collaborate with visionary enterprise clients
 </li>
 <li>
 Create transformative digital products
 </li>
 <li>
 Learn how to handle difficult situations
 </li>
 <li>
 Tackle complex challenges at scale
 </li>
 <li>
 Push boundaries with emerging technologies
 </li>
 </ul>
 
 
 
 
 
 Requirements
 
 
 <ul>
 <li>
 Expertise in React, Node, Express, Mongo, SQL
 </li>
 <li>
 We have a 2-hour assessment
 </li>
 <li>
 High-level English proficiency (written &amp; verbal)
 </li>
 <li>
 Show up as a proactive, team-oriented self-starter on Zoom
 </li>
 </ul>
 
 
 
 
 
 Why Lumenalta?
 
 
 <ul>
 <li>
 Work on meaningful, impactful projects.
 </li>
 <li>
 Collaborate with a talented, supportive team
 </li>
 <li>
 Enjoy a flexible, remote-first environment
 </li>
 <li>
 Join a company that values your growth
 </li>
 </ul>
 
 
 
 
 If you&rsquo;re a passionate, career-focused developer ready to make a lasting impact, we want to hear from you!
 
 
 
 
 
 What's it like to work at Lumenalta?
 
 
 
 
 
 This is a fully remote position open to candidates based in
 
 Europe or regions with compatible time zones
 
 . To ensure effective collaboration with our client and team, candidates must maintain a
 
 6-hour overlap with Eastern U.S. business hours
 
 .
 
 
 
 
 
 
 Application Deadline
 
 
 
 This role is an evergreen position with no predetermined start date. Applications will be accepted until
 
 March 29, 2026
 
 . As we continue to build our talent pipeline, the position may be reposted to allow us to connect with additional qualified professionals.
 
</div>

Javascript Fullstack Engineer - Senior

sonnen Egypt

<div>
 
 Standort
 
 
 
 Cairo, EG
 
 
 
 Stellen-ID
 
 : 5306
 
 
 Join the energy revolution with #teamsonnen!
 
 
 At sonnen, we&rsquo;re driven by a clear goal: creating a future powered by clean, affordable energy for everyone. That&rsquo;s why we make our customers independent &ndash; not only from fossil fuels, but also from rising electricity costs.
 
 
 The key to this independence is our intelligent, all-in-one energy system. It combines solar panels, battery storage, energy tariffs, and wallboxes &ndash; all developed and manufactured in Germany.
 
 
 As the first and only provider in Germany, we also connect thousands of home batteries into one shared network: the sonnenVPP, our industry-leading virtual power plant.
 
 
 In short: every day, we&rsquo;re working to shape the energy future. And we&rsquo;d be thrilled to have you join us!
 
 
 
 What you will do to help drive the energy transition:
 
 
 
 <ul>
 <li>
 Participate in the entire development process, including refinements, code reviews, tests, deployment and monitoring on production.
 </li>
 <li>
 Maintain and extend our Ruby on Rails based services.
 </li>
 <li>
 Implement user friendly frontends using modern technologies including Hotwire.
 </li>
 <li>
 Build and maintain GraphQL interfaces and RESTful endpoints (JSON:API).
 </li>
 <li>
 Convert acceptance criteria into test cases written in RSpec framework.
 </li>
 <li>
 Write new and update existing documentation entries.
 </li>
 <li>
 Contribute to the implementation of micro-services.
 </li>
 <li>
 Push and follow up on builds and deploys, using CI/CD pipeline tools.
 </li>
 <li>
 Collaborate with a development team on the planning and implementation of tasks, troubleshoot of issues, and refactoring.
 </li>
 <li>
 Interpretate log messages and mitigate errors coming from our monitoring tools.
 </li>
 <li>
 Collaborate closely with cross-functional teams in an Agile development environment, familiar with a Software Delivery Lifecycle following Scrum practices.
 
 
 </li>
 </ul>
 
 What You Will Need On That Journey
 
 
 
 <ul>
 <li>
 2+ years of full-stack experience with Ruby on Rails, RSpec and GraphQL
 </li>
 <li>
 Proficiency with CI/CD processes (GitLab/GitHub), backend infrastructure (AWS) and monitoring tools (Datadog).
 </li>
 <li>
 You are keen on following architectural paradigms &amp; object-oriented patterns.
 </li>
 <li>
 You are open-minded to follow instructions from other senior developers.
 </li>
 <li>
 You are outspoken and see feedback exchange as a normal part of your everyday work.
 </li>
 <li>
 You comfortably express your ideas and arguments in good spoken and written English.
 
 
 </li>
 </ul>
 
 Stellensegment:
 
 Ruby on Rails, Testing, Technology
</div>

Fullstack Engineer (m/w/d)

Payce

Full Stack EngineerCompany: Payce Location: Oman (Remote or Hybrid) Job Type: Full TimeAbout PaycePayce is building a modern payment platform for restaurants and venues. Customers scan a QR code, view their bill, and pay directly from their phone. Our goal is to make payments faster and simpler for both businesses and customers.RoleWe are looking for a full stack engineer to help build and improve the Payce platform. You will work closely with the founder to ship features, improve the system, and help scale the product as more businesses start using it.Tech StackPayce uses modern web technologies including React, Node.js, and PostgreSQL. Experience with similar technologies is acceptable.What We Look ForStrong full stack development experience Ability to build and ship features independently Good understanding of APIs and databases Problem solving mindset Interest in building real products used by customersWhy Work at PayceOpportunity to work on a real fintech product High ownership and responsibility Chance to help build a growing startup from an early stageJob Type: Full-timePay: RO500.000 - RO650.000 per monthWork Location: Remote

Fullstack Software Engineer

Pet Media Group (PMG)

<div>
 
 About us
 
 Pet Media Group (PMG) is a scale-up that acquires, launches, and develops market-leading pet marketplaces globally, with over 1.5 million animals finding new homes through our platforms every year. We currently operate in 6 countries (UK, Sweden, Netherlands, Italy, Spain, and most recently the US) &mdash; all within just 5 years of launching. Here's one of our apps: Pets4Homes.co.uk
 
 
 The way pets find new loving homes has remained largely unchanged for centuries. We're on a mission to change that through innovative technology &mdash; and increasingly, through the intelligent use of AI. We're a young and ambitious team who have built unicorns before (e.g. Avito), backed by some of Europe's leading investors (e.g. Verdane and Otiva &mdash; early backers of Klarna, CAIA, Apotea, and Easypark).
 
 
 
 Who are we looking for?
 
 
 
 We're expanding our Monetisation team and looking for an FE-focused full stack engineer to help us build great products in the payment processing &amp; value-added services space, and improve the user experience in the payment domain.
 
 
 We're not just looking for a strong engineer &mdash; we're looking for someone who actively uses AI tools as part of their daily workflow: whether that's using LLMs to accelerate development, exploring AI-powered tooling for testing, code review, or product ideation, or simply staying genuinely curious about where the technology is heading.
 
 
 We expect roughly 6 years of engineering experience, ideally with our current tech stack &mdash; and a mindset that sees AI as a multiplier, not a buzzword.
 
 
 
 Requirements
 
 We're a fast-growing scale-up. We want engineers who build fast, fail fast, and learn fast. You don't need to be a world-class expert in every tool we use &mdash; but you do need a critical, open mindset, strong JavaScript proficiency, and a genuine enthusiasm for AI-assisted development.
 
 
 
 Core (required):
 
 
 
 <ul>
 <li>
 Building apps with TypeScript, Next.js, Node.js &amp; React
 </li>
 <li>
 Understanding of GraphQL and its usage in large systems with multiple consumers
 </li>
 <li>
 Experience with frontend testing tools and testing strategies
 </li>
 <li>
 Experience with relational databases like PostgreSQL
 </li>
 <li>
 Active use of AI tools (e.g. Claude, Cursor, Codex, ...) in your day-to-day engineering work &mdash; we want to hear how you use them
 
 
 </li>
 </ul>
 
 Bonus (helpful &amp; appreciated):
 
 
 
 <ul>
 <li>
 Experience with payment processing (Stripe, Adyen, Braintree)
 </li>
 <li>
 Experience with search technologies like Elasticsearch
 </li>
 <li>
 Experience with monitoring &amp; observability tools like Grafana
 </li>
 <li>
 Experience with responsive design &amp; mobile web UX
 </li>
 <li>
 Experience with UI/component frameworks like Tailwind
 </li>
 <li>
 Experience evaluating or experimenting with AI coding workflows at team or company level
 
 
 </li>
 </ul>
 Working proficiency in English is required.
 
 
 
 
 Our tech stack
 
 
 Next.js, React, Node.js &amp; React Native (TypeScript throughout)
 
 
 <ul>
 <li>
 GitLab CI/CD
 </li>
 <li>
 Elasticsearch
 </li>
 <li>
 Redis
 </li>
 <li>
 GraphQL &amp; PostgreSQL
 </li>
 <li>
 Knex
 </li>
 <li>
 Docker
 </li>
 <li>
 Serverless with AWS Lambda
 </li>
 <li>
 AWS
 </li>
 <li>
 Grafana
 </li>
 <li>
 Bitrise
 
 
 </li>
 </ul>
 
 What We Offer
 
 
 
 <ul>
 <li>
 Join a rapidly growing, already-profitable business with a clear vision and genuine energy
 </li>
 <li>
 A diverse team across Sweden, Germany, Austria, UK, Poland, Portugal, Bosnia, Croatia, Ukraine and Egypt
 </li>
 <li>
 A real opportunity to shape our tech department &mdash; and to help define how AI becomes part of how we build
 </li>
 <li>
 Competitive compensation and great benefits (remote or in-person)
 
 
 </li>
 </ul>
 We very much look forward to your application, contact us if you have any questions!
</div>

Senior Fullstack Engineer (FE-focused) — Monetisation Team (f/m/d)

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