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# Senior Front-End Developer

- **Company:** Segmentify
- **Location:** London, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** JavaScript (Programming Language), Application Programming Interfaces (APIs), Software Quality, Code Review, Computer Engineering, Web Development, Github, Node.Js, Open Web Application Security, Package Development Process, Svelte, Software Engineering, Software Systems, TypeScript, Management of Software Versions, Web Applications, Web Usability, Data Logging, ReactJS, Cypress (Programming Language), Caching, Backend, Rate Limiting, Vue.js, Webpack, Integration Tests, Information Technology, Playwright, Performance Monitor, Npm(Software), Graphql, Front End Software Development, NestJS, JestJS, Monolithic Repository
- **Published:** September 9, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/senior-front-end-developer/46481732

## About the Role

orchestration, caching, rate limiting, and security best practices Write robust, type-safe code in TypeScript with well-structured domain models Develop SDKs and reusable libraries used by external developers/customers Ensure code quality through unit/integration testing, code reviews, and performance/security improvements RequirementsDevelop scalable, maintainable web applications regardless of framework (React, Vue, Svelte, vanilla JS) BSc or MSc degree in Computer Science, Computer Engineering, Software Engineering or related disciplines from reputable universities 7+ years of professional web development experience Deep knowledge of Babel, Vite, and esbuild (plugins, loaders, build optimization) Strong experience with npm package development and publishing (monorepo/workspace experience is a plus) Proven experience with GitHub Actions (or similar) for front-end CI/CD Hands-on BFF development experience (Node.js, preferably NestJS/Express) Advanced TypeScript knowledge (generics,
utility types, strict mode, configuration optimization) Experience developing SDKs or client libraries and releasing them to production Experience working on customer integrations and handling revision requests Strong experience with npm package development and publishing (monorepo/workspace experience is a plus) Proven experience with GitHub Actions (or similar) for front-end CI/CD Hands-on BFF development experience (Node.js, preferably NestJS/Express) Advanced TypeScript knowledge (generics, utility types, strict mode, configuration optimization) Experience developing SDKs or client libraries and releasing them to production Experience working on customer integrations and handling revision requests English level B2 or higher - must be comfortable with technical communication, documentation, and client interactions Nice To Have:Monorepo setups (Nx, Turborepo), Storybook, Playwright/Cypress, Vitest/Jest Performance monitoring (Lighthouse, Web Vitals) and logging/observability Security
best practices (CSP, SRI, OWASP, dependency auditing) CDN, edge functions, SSR/SSG, ISR architectures Micro-frontend or design-system experience #J-18808-Ljbffr

## Description

and personalise their campaigns on a daily basis. Our Tech Stack includes TypeScript, Node.js, React/Vue/Svelte, Vite, esbuild, Babel, pnpm/npm, GitHub Actions, Jest/Vitest, Playwright/Cypress, NestJS/Express, REST/GraphQL (check details from Stack Share Profile ) Responsibilities:Develop scalable, maintainable web applications regardless of framework (React, Vue, Svelte, vanilla JS) Manage customer integrations, write integration documentation, and support setup phases Analyze and deliver customer revision and feature requests in a timely manner Configure and optimize build pipelines with Babel, Vite, and esbuild (HMR, tree-shaking, code-splitting, bundle size optimization) Develop and publish npm packages (semantic versioning, changelogs, automated releases) Build Front-End CI/CD pipelines with GitHub Actions (lint/test/build/storybook/e2e, caching, multi-environment deployments) Design and implement Backend-for-Frontend (BFF) layers (preferably using Node.js/NestJS) with, API


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