> Markdown version of [/jobs/ext/74054-senior-frontend-engineer](https://www.wearedevelopers.com/jobs/ext/74054-senior-frontend-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Frontend Engineer - **Company:** Halos Body Cams - **Location:** Belfast, UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** JavaScript (Programming Language), Application Programming Interfaces (APIs), Artificial Intelligence, Cloud Computing, Code Review, Performance Tuning, E2e Testing, Next.js, TypeScript, Web Usability, AWS Cdk, Network Routers, Tailwind, ReactJS, AWS Lambda, Backend, Webpack, Playwright, Build Tools, React Native, Front End Software Development, JestJS - **Published:** May 13, 2026 - **Apply:** https://uk.indeed.com/viewjob?jk=acf2a8014eb21c2c ## About the Role Do you have experience in TypeScript?, You're a pragmatic engineer who values simplicity and type safety. You've shipped production apps at scale and understand trade-offs between abstraction and clarity. You're experienced in taking features from requirements through implementation to production. Required: * 5+ years professional TypeScript/JavaScript development * Expert React with modern patterns in SPA applications * Modern build tools (Vite, Turbo, webpack) and monorepo management Helpful: * tRPC, Tanstack ecosystem (Query, Router, Table), & Next.js * AWS CDK * Tailwind CSS, Shadcn/Radix components * Zod validation, Playwright E2E testing * Performance optimization and Web Vitals experience * React Native ## Description HALOS is an advanced body camera and cloud software scaleup, working with some of the biggest names in security, services, and law enforcement. At HALO, we're passionate about safety and innovation, constantly staying ahead of threats and reducing risk. What sets HALOS apart is not just the cutting-edge technology we develop but the culture we've nurtured. Our team embodies openness, transparency, and a "one team" spirit. We're a group of passionate individuals, all working on exciting and impactful projects. Here, you'll find an environment that fosters collaboration, creativity, and a shared sense of purpose. What you'll work on We're building the next generation of AI-driven video forensic and evidence analysis tooling for our body-worn camera platform. As a Senior Frontend Engineer, you'll help shape the user experience behind complex investigative workflows including video review, transcription, timeline analysis, streaming, and AI-assisted insights. This is a hands-on engineering role focused on building fast, reliable, and intuitive interfaces for large-scale media and data-heavy applications. You'll work closely with backend engineers, product, and design to deliver modern React applications that balance performance, usability, and maintainability across mission-critical workflows. Day to Day * Build React applications using TypeScript, Tanstack Router/Query, and Shadcn UI * Design type-safe APIs with tRPC spanning frontend and backend * Develop AWS Lambda functions and manage infrastructure with AWS CDK * Work across React (Vite) and Next.js monorepos using Turbo and pnpm * Write tests with Vitest and Playwright * Optimize performance (bundle sizes, Core Web Vitals, query caching) * Review code, maintain strict TypeScript standards, and ensure security best practices with Zod validation ## Related Videos - [GraphQL + Apollo + Next.js: A Lovely Trio](https://www.wearedevelopers.com/videos/311-graphql-apollo-next-js-a-lovely-trio) - [Micro Frontends with Module Federation: Why and How?](https://www.wearedevelopers.com/videos/165-micro-frontends-with-module-federation-why-and-how) - [But, you're not Facebook](https://www.wearedevelopers.com/videos/378-but-you-re-not-facebook) - [From Zero to Hero: NextJS 13 and Tailwind CSS for Beginners](https://www.wearedevelopers.com/videos/766-from-zero-to-hero-nextjs-13-and-tailwind-css-for-beginners) - [Native Federation: The Future of Micro Frontends and Plugin-Systems in Angular](https://www.wearedevelopers.com/videos/1018-native-federation-the-future-of-micro-frontends-and-plugin-systems-in-angular) - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) ## Related Articles - [The Best 7 Frontend Frameworks for Developers in 2025](https://www.wearedevelopers.com/magazine/400-the-best-7-frontend-frameworks-for-developers-in-2025) - [16 Best Free React UI Libraries in 2025](https://www.wearedevelopers.com/magazine/148-16-best-free-react-ui-libraries-in-2025) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Dev Digest 133 - Back to Front](https://www.wearedevelopers.com/magazine/474-dev-digest-133-back-to-front) - [25 Essential Tools for Front End Developers](https://www.wearedevelopers.com/magazine/210-25-essential-tools-for-front-end-developers) - [React Developer Salary [2023]](https://www.wearedevelopers.com/magazine/198-react-developer-salary-2023)