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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Web Developer - **Company:** Yuno - **Location:** DIEMEN, Netherlands (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Clean Code Principles, Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Amazon S3, Application Services, Software Quality, Code Review, Continuous Integration, Cursor (Graphical User Interface Elements), Software Debugging, Object-Oriented Software Development, Payment Service Provider, Scrum Methodology, E2e Testing, Systems Integration, TypeScript, Management of Software Versions, Data Storage Technologies, Apache Yarn, GitHub Copilot, ReactJS, Large Language Models, Backend, Git, Npm(Software), NestJS, Network Server, Docker - **Published:** September 5, 2026 - **Apply:** https://startup.jobs/senior-web-developer-yuno-8057096 ## About the Role * 5+ years building production applications with React, with strong JavaScript and TypeScript * Solid command of the modern web stack - Node, CSS, Next.js, Storybook, and Emotion * Engineering fundamentals - OOP, Git, unit and E2E testing, and CI/CD * Build and packaging tooling (NPM / yarn), with an eye for bundle size and performance * AWS (S3, Amplify) and Docker * AI-assisted development - fluent use of tools like Claude Code, Cursor, or GitHub Copilot, and leveraging LLMs across design, implementation, debugging, testing, documentation, and code reviews * Autonomy and agile delivery - you own tasks end to end and work comfortably in SCRUM * English - advanced proficiency, written and spoken, * Experience in the payments industry and integrating Payment Service Providers (PSPs) * Backend experience (e.g., NestJS) and familiarity with backend languages * Building custom workflows with AI agents, MCP servers, development assistants, or engineering automation platforms Nice to Have * Experience defining AI-driven development practices within an engineering team * Spanish proficiency ## Description Yuno is looking for a Senior Web Developer to build the SDK, design system, and web components that power how third parties integrate with our platform. You'll own the developer-facing surface of Yuno's single API - the reusable components and SDKs that merchants, banks, and partners embed into their own products across browsers, frameworks, and environments. This is a role where developer experience is the product: the quality, performance, and consistency of what you ship directly shape how easily the world connects to Yuno. How AI Shows Up in This Role * AI is our default execution layer - you'll use AI-assisted tools like Claude Code, Cursor, and GitHub Copilot, and LLMs more broadly, across design, implementation, debugging, testing, documentation, and code review as standard practice, not novelty * You'll help shape how the engineering team works with AI, building workflows with AI agents and MCP servers and defining AI-driven development practices that raise the whole team's leverage * The SDKs and components you build are the developer-facing edge of an AI-native payments platform whose agents learn from every transaction on the network, * SDK and design system - create the design system and web components used across third-party applications, ensuring SDK compatibility across browsers, frameworks, and integration environments * Cross-platform consistency - collaborate with backend and mobile teams so the SDK behaves consistently across every platform and integration * Performance and build optimization - design low-latency, high-availability applications and optimize bundle size, tree-shaking, and build performance for SDK distribution * Full-stack integration - connect user-facing elements with server-side logic and integrate data storage solutions into cohesive, reliable systems * Code quality and security - write reusable, testable, and efficient code, and implement security and data protection throughout * Developer experience and releases - maintain high-quality documentation and DX for integrators, and design automated pipelines for publishing and versioning SDK releases What Success Looks Like Within your first 6-12 months, you've shipped SDK components adopted by external integrators, raised the bar on developer experience and documentation, and own the pipeline that publishes and versions Yuno's web SDKs. ## Related Videos - [WeAreDevelopers LIVE – AI, Freelancing, Keeping Up with Tech and More](https://www.wearedevelopers.com/videos/1786-wearedevelopers-live-ai-freelancing-keeping-up-with-tech-and-more) - [Nest.js - TypeScript in the backend can also be clean](https://www.wearedevelopers.com/videos/1033-nest-js-typescript-in-the-backend-can-also-be-clean) - [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered) - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [Next, Nest, Nuxt… Nust?](https://www.wearedevelopers.com/videos/421-next-nest-nuxt-nust) - [Streaming AI Responses in Real-Time with SSE in Next.js & NestJS](https://www.wearedevelopers.com/videos/1630-streaming-ai-responses-in-real-time-with-sse-in-next-js-nestjs) ## Related Articles - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [Dev Digest 133 - Back to Front](https://www.wearedevelopers.com/magazine/474-dev-digest-133-back-to-front) - [Dev Digest 113 - Debugging above the cloud](https://www.wearedevelopers.com/magazine/422-dev-digest-113-debugging-above-the-cloud) - [Dev Digest 109 -Egg-citing things…](https://www.wearedevelopers.com/magazine/408-dev-digest-109-egg-citing-things) - [WeAreDevelopers Dev Digest Issue 116 - The new search wars…](https://www.wearedevelopers.com/magazine/445-wearedevelopers-dev-digest-issue-116-the-new-search-wars)