TypeScript developer (Frontend) - Senior - Contract - London/Hybrid - £430pd Inside IR35

TypeScript developer (Frontend) - Senior - Contract - London/Hybrid - £430pd Inside IR35

12 months

£430pd Inside IR35

1 day per week on site in London

We are looking for a highly skilled TypeScript Developer to join our team and play a pivotal role in the implementation of a new project. You will be instrumental in shaping our shift-left testing strategy, ensuring quality and resilience are Embedded from the very beginning of development. With strong expertise in Next.js, you will work across the stack-from building modern, performant Front End experiences to designing and integrating APIs and microservices. You will take ownership of delivering secure, scalable, testable, and maintainable solutions that meet the highest engineering standards.

Key Responsibilities:

Design, build, and maintain full-stack applications using TypeScript, Next.js, Node.js, and React.

Champion the shift-left approach by embedding quality early in the SDLC, writing unit, integration, and end-to-end tests alongside feature development.

Implement and maintain automated test suites using Playwright, Jest, and React Testing Library to ensure reliability and regression coverage.

Collaborate with cross-functional teams (UX/UI designers, product owners, QA, DevOps) to deliver well-scoped, high-quality features.

Contribute to system architecture discussions, ensuring scalability, security, and performance.

Build reusable components, libraries, and utilities to accelerate development across the team.

Participate in code reviews, ensuring adherence to best practices, coding standards, and security guidelines.

Work closely with DevOps to enhance CI/CD pipelines, enabling continuous integration, test automation, and smooth deployments.

Monitor application performance and troubleshoot issues across the stack, proactively improving system resilience.

Stay up to date with industry trends and emerging tools in TypeScript, Next.js, and test automation to continuously raise the bar of engineering excellence.

Required Skills and Experience:

Proven professional experience in Front End software development.

Next.js (v14+)

Gitlab pipelines

Broad knowledge & practical expertise in Front End technologies including JavaScript, TypeScript, React, and Node.js.

Strong understanding of Advanced Typescript concepts (eg Generics, Mapped & Utility types etc.)

Knowledge of REST APIs and tools for testing API endpoints.

Understanding of Agile software development methodologies and shift-left testing practices.

Required experience in Design & developing automated tests for Front End and Back End services using TypeScript and modern test frameworks (Playwright, React-test library).

Excellent communication and collaboration skills.

Computer science, software engineering, or relevant technical background required.

Desirable:

Experience with maintaining mono-repo (eg Nx, Lerna or Turborepo)

Familiarity with containerised environments (eg Docker, Kubernetes).

Exposure to monitoring and observability tools (eg DataDog, Grafana).

Experience in performance or accessibility testing (eg Playwright Lighthouse)