Senior Frontend Engineer

Senior Frontend Engineer (React & Cross-Platform) Location: Central London (Hybrid – 3 days per week in the office) We're partnering with an innovative technology company developing AI-powered software that transforms video data into actionable insights. Their flagship platform combines cutting-edge computer vision with intuitive applications used by customers globally, and they're now looking for an experienced Frontend Engineer to take ownership of the product as it moves fully in-house. This is an opportunity to join a small, highly technical team where you'll have genuine ownership over the frontend architecture, technical direction and delivery across multiple platforms. The Role You'll become the technical owner of an established production application built in React, taking responsibility for its continued evolution across web, iOS and Android. You'll be responsible for understanding the existing architecture, evaluating the current codebase and making key technical decisions around whether components should be maintained, refactored or redesigned. Working closely with backend and machine learning engineers, you'll build new functionality, improve reliability and own the complete release process across all supported platforms. Responsibilities Take ownership of an existing production React application Drive frontend development across web, iOS and Android Analyse and understand an inherited codebase with limited historical knowledge Define the long-term frontend architecture and technical roadmap Deliver new features while improving maintainability and performance Build and manage CI/CD pipelines Own deployments to production, including web and mobile app releases Improve monitoring, observability and production reliability Integrate frontend applications with Python/FastAPI backend services Work independently while collaborating closely with a small engineering team What They're looking For Strong commercial experience with React Excellent JavaScript and TypeScript skills Experience taking ownership of existing production applications Cross-platform development experience across web and mobile CI/CD pipeline ownership and production deployment experience Comfortable making architectural decisions independently Experience integrating frontend applications with REST APIs Ability to troubleshoot production issues and deliver solutions quickly Nice to Have Experience working within startup or scale-up environments Exposure to React Native or similar cross-platform frameworks Experience with monitoring or observability tooling Familiarity with Python/FastAPI environments Background building technical or engineering-focused software products Why Join? High-impact role with complete ownership of a core product Small, collaborative engineering team with minimal bureaucracy Opportunity to shape the future technical direction of the platform Cutting-edge AI and computer vision technology Modern engineering environment with significant autonomy Hybrid working from a Central London office Timing This is an immediate priority hire. The business is reviewing applications as they arrive and is keen to move quickly for the right person.