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 applicationDrive frontend development across web, iOS and AndroidAnalyse and understand an inherited codebase with limited historical knowledgeDefine the long-term frontend architecture and technical roadmapDeliver new features while improving maintainability and performanceBuild and manage CI/CD pipelinesOwn deployments to production, including web and mobile app releasesImprove monitoring, observability and production reliabilityIntegrate frontend applications with Python/FastAPI backend servicesWork independently while collaborating closely with a small engineering team What They're looking For Strong commercial experience with ReactExcellent JavaScript and TypeScript skillsExperience taking ownership of existing production applicationsCross-platform development experience across web and mobileCI/CD pipeline ownership and production deployment experienceComfortable making architectural decisions independentlyExperience integrating frontend applications with REST APIsAbility to troubleshoot production issues and deliver solutions quickly Nice to Have Experience working within startup or scale-up environmentsExposure to React Native or similar cross-platform frameworksExperience with monitoring or observability toolingFamiliarity with Python/FastAPI environmentsBackground building technical or engineering-focused software products Why Join? High-impact role with complete ownership of a core productSmall, collaborative engineering team with minimal bureaucracyOpportunity to shape the future technical direction of the platformCutting-edge AI and computer vision technologyModern engineering environment with significant autonomyHybrid 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.