At a Glance
- Tasks: Develop and maintain a cutting-edge platform using React and Node.js.
- Company: Join a forward-thinking tech company focused on enhancing online customer journeys.
- Benefits: Competitive salary, flexible working options, and opportunities for professional growth.
- Other info: Work in a collaborative team with a focus on quality and testing.
- Why this job: Make a real impact by building innovative solutions in a dynamic environment.
- Qualifications: 3+ years of JavaScript experience with strong skills in React and Node.js.
The predicted salary is between 40500 - 49500 £ per year.
Job Description
If you are a Full Stack Java Script Developer with a proven track record of developing single-page applications, we have a new role we would like to discuss with you.
The client is building a platform that guides consumers through the complete online customer journey, from their first visit through identity verification, e-signature and submission.
As a Mid-Level Full-Stack Java Script Developer, you'll work across the platform: a React single-page application on the Front End, Node. js APIs and background workers on the Back End, and Microsoft SQL Server as the system of record.
This is a hands-on product engineering role where you'll ship customer-facing journey steps, build and consume REST APIs, write database migrations and integrate third-party services behind clean, maintainable interfaces.
Build and maintain customer-journey screens and shared components in React 19, using React Router 7, Vite and Sass/SCSS across multiple branded sites from a single codebase.
js, including a Fastify API, an Express Back End-for-Front End and durable background jobs processed through a SQL-backed outbox queue.
Design and evolve the SQL Server schema through forward-only migrations, using parameterised queries and transactional business logic.
Integrate and mock third-party services, including identity-verification and lead-management providers, while keeping transport details behind well-defined interfaces.
Vitest unit and route tests, Testing Library component tests, and Playwright end-to-end journeys against a real database running in Docker.
Build with the needs of a regulated consumer product in mind, including robust input validation, careful PII handling, audit trails, idempotent retries and graceful degradation.
At least three years of professional Java Script development experience, with meaningful hands-on work across both Front End and Back End development.
Strong React fundamentals, including hooks, controlled forms, routing and state management, together with confidence using modern ESM tooling.
Experience building and consuming REST APIs in Node. js using Fastify, Express or a comparable framework.
Practical SQL knowledge covering schema design, joins, transactions and indexes. SQL Server experience is helpful but not essential.
A genuine testing habit: you write useful tests because they prevent defects and support confident delivery, not simply because the CI pipeline requires them.
Experience working on multi-tenant or multi-brand products.
Exposure to regulated industries such as financial services or insurance, or experience with KYC and identity-verification journeys.
Full stack Developer - URGENT in Upminster employer: Devonshire Hayes
Devonshire Hayes is an exceptional employer that fosters a dynamic work culture, encouraging innovation and collaboration among its team members. Located in Watford, the company offers comprehensive benefits, including fully covered travel expenses, and prioritises employee growth through continuous professional development opportunities. Join us to be part of a forward-thinking organisation where your contributions directly influence our success in winning major bids across diverse sectors.
