Full Stack Developer - React.js/Node.js
First seen by Alion on Oct 31, 2026.
About the role :
Own a frontend module and backend end to end its component architecture, state strategy, performance budget, accessibility and test suite along with the API contracts it depends on. Roughly 70% frontend and 30% backend in Node.js services. You will work independently, contribute to architectural decisions, mentor one engineer, carry on-call, and present your work directly to enterprise client stakeholders.
What you will do :
- Own the component architecture and state strategy of a frontend module, recording non obvious decisions.
- Own the module's performance budget (bundle size, render performance, Core Web Vitals) and accessibility to WCAG 2.2 AA measured, not assumed.
- Own the test strategy, including component, integration and end-to-end coverage.
- Negotiate and validate API contracts with backend engineers, and implement endpoints where the feature requires it.
- Debug production issues across the frontend and backend boundary and write the root cause analysis.
- Review pull requests, mentor one engineer, and present design and delivery risk to clients.
What we are looking for :
- 3+ years with React and TypeScript in production applications.
- Production Next.js rendering modes, data fetching, caching behaviour.
- Demonstrated ownership of component architecture and state strategy on a real module.
- Measured performance work (bundle analysis, code splitting, render optimisation) and practical accessibility experience.
- Ownership of an end-to-end test suite (Playwright or Cypress) alongside component and integration tests.
- Daily use of AI coding assistants (Cursor, Claude, GitHub Copilot or equivalent) - prompt and context engineering, spec-driven development, and the judgement to verify output and catch AI-introduced defects in review.
- Strong Git and code review discipline, and evidence of mentoring other engineers.
- Confident written and spoken English for direct client communication.
Also part of the role :
- Strong working knowledge of Node.js and TypeScript with NestJS or Express.
- REST API design - validation, versioning, error contracts; GraphQL where used.
- PostgreSQL or MongoDB schema design, query optimisation and indexing.
- Debugging across the service boundary, and reviewing AI-generated backend code.
Nice to have :
- Agentic AI frameworks (LangGraph, CrewAI, PydanticAI)
- OpenAI SDK
- MCP
- RAG and vector databases
- Design systems and Storybook
- Micro-frontends
- AWS
Skills
Full Stack, React.js, TypeScript, Node.js, Next.js, Javascript, RESTful API, AWS