Senior Frontend Engineer - React / TypeScript Belfast | HybridSenior-level frontend engineering role at a fast-growing tech scaleupReact, TypeScript, tRPC, and AWS on mission-critical softwareHybrid working with Belfast baseSalary up to £85kWork on AI-driven video forensic tools used by law enforcement and security organisationsAbout the CompanyOur client is an advanced body camera and cloud software scaleup operating at the intersection of AI, video intelligence and public safety. Their platforms are trusted by some of the biggest names in security, services and law enforcement processing and analysing large-scale media and evidence data in real time. It's a high-growth environment with a strong "one team" culture built on openness, collaboration and genuine impact.The RoleThis is a hands-on Senior Frontend Engineering position within a team building next-generation AI-driven video forensic and evidence analysis tooling. You'll take real ownership of the user experience behind complex investigative workflows video review, transcription, timeline analysis, streaming and AI-assisted insights. Working closely with backend engineers, product and design, you'll deliver performant, maintainable React applications that power mission-critical workflows at scale.Key ResponsibilitiesBuild and maintain React applications using TypeScript, Tanstack Router/Query and Shadcn UIDesign and implement type-safe APIs with tRPC across frontend and backendDevelop AWS Lambda functions and manage infrastructure using AWS CDKWork across React (Vite) and monorepos with Turbo and pnpmWrite robust test coverage using Vitest and PlaywrightOptimise performance across bundle sizes, Core Web Vitals and query cachingReview code and uphold strict TypeScript standards and security best practicesCollaborate with product and design to take features from requirements through to productionWhat You'll NeedEssential:5+ years of professional TypeScript / JavaScript developmentExpert-level React with modern patterns across SPA applicationsStrong experience with modern build tools (Vite, Turbo, webpack) and monorepo managementA pragmatic approach - you understand the trade-offs between abstraction and clarityNice to Have:Experience with tRPC and the Tanstack ecosystem (Query, Router, Table)AWS CDK, Tailwind CSS, Shadcn/Radix componentsZod validation and Playwright E2E testingReact Native exposureWhy Apply?Salary up to £85k depending on experienceHybrid working with a Belfast city centre basePrivate health insurance and pension matching schemeGenerous annual leave allowanceLearning and development opportunities with real investment in your growthCycle to work and Home & Tech schemes via salary sacrificeHigh-trust environment with significant responsibility and real career progressionInterested?For more information or to submit your CV, connect with Ryan Quinn on LinkedIn or reach out via the link below. Skills:AWS TypeScript ReactBenefits:BonusWHJS1_NI