Top Front End Developer Jobs in Cologne

Develop and maintain React-based marketplace software, owning features from design through deployment and ongoing improvement. Collaborate with product managers, designers, and engineers to build user-facing products across digital, physical, and payments domains. Improve architecture, code quality, performance, and engineering practices while delivering measurable user growth, service quality, and sales impact.

Leads two distributed frontend engineering squads responsible for Grafana’s frontend platform and navigation. Owns team performance, hiring, planning, discovery, delivery, engineering direction, and customer outcomes. Partners with Product and Design, develops technical leaders, improves engineering workflows through AI and automation, and drives quality, security, reliability, accessibility, and operational excellence. Participates in engineering management on-call and helps shape frontend foundations, search, navigation, and multitenant capabilities.

Leads and mentors a frontend engineering team while remaining hands-on with coding, architecture, code reviews, and technical delivery. Owns migration to Nuxt.js and server-side rendering, performance engineering, Core Web Vitals, and technical SEO. Manages team performance, career development, and work allocation while collaborating with product, backend, and cross-functional stakeholders to deliver scalable, high-quality software.

Develop frontend interfaces and A/B experiments for a health-focused AI product using Vue 3, TypeScript, and Vite. Improve design systems and AI-assisted development workflows, own features from concept through production, collaborate across engineering, design, product, and analytics, and optimize performance, reliability, and development velocity using user data and experimentation results.

Develop and maintain responsive frontend applications using TypeScript, integrate APIs and services, implement UI/UX designs, optimize performance and scalability, apply frontend security and data protection practices, troubleshoot issues, participate in code reviews, and contribute to open-source privacy-focused projects.

Build and own complex, high-performance frontend experiences for observability products using Angular or another major frontend framework. Lead frontend architecture, translate complex data into intuitive interfaces, collaborate cross-functionally, write tested production code, review code, mentor engineers, and drive features from concept through production.

Build and optimize ZOE’s customer-facing website using TypeScript, React, and Next.js, with a strong focus on accessibility, performance, responsive design, and design-system development. Collaborate with designers, analysts, and product teams on user experiences and A/B testing. Contribute to backend services using Kotlin or Python, support API development, write maintainable code, and ship production improvements regularly.

Own the frontend architecture and implementation of a scientific experimentation platform. Build complex visualizations, workflow graphs, live monitoring, large result interfaces, and robust asynchronous workflows. Establish testing, review, component, and design standards while migrating to the Constructor React library. Work directly with physicists to translate scientific needs into usable interfaces and contribute to backend code when necessary.

Build and improve high-quality web products and reusable design-system components. Own frontend performance, including data loading, caching, server rendering, and streaming. Apply strong product judgment to complex UX problems and collaborate with designers, engineers, and product leaders. Work autonomously across products, establish frontend quality standards, and help elevate team practices through technical leadership and craftsmanship.

Build and operate production AI backend systems, including inference pipelines, orchestration layers, and reliable APIs. Optimize latency, throughput, caching, batching, and streaming while monitoring distributed services and responding to incidents. The role requires strong backend fundamentals, experience with high-throughput services, familiarity with LLM and multimodal inference, and the ability to debug systems under load.

Shape frontend architecture and technical direction across React, React Native, and a shared Nx monorepo. Own platform capabilities, shared libraries, design-system foundations, tooling, developer experience, performance, testing, migrations, and systemic quality improvements. Remain hands-on with implementation and investigations, partner across product, backend, and QA, and mentor senior engineers while improving consistency and effectiveness across teams.

Own complex frontend features across web and mobile using React, React Native, and TypeScript. Design reusable frontend architecture, diagnose rendering and performance issues, collaborate with product, backend, and QA, and maintain quality through code review and automated testing. Mentor colleagues, share knowledge, and contribute to weekly releases while owning work from problem definition through production.

Build and maintain user-facing features and interfaces for Restream web services. Design and implement UI and business logic, collaborate with product designers and engineers, perform code reviews, improve reliability and scalability, and evaluate emerging technologies.

Design and implement complex customer-facing frontend features using TypeScript and React. Provide technical leadership, mentor junior engineers, drive frontend architecture and best practices, improve performance and accessibility, partner with product/design, integrate with backend APIs, and manage technical debt and scalability.

Design, develop, and test user interfaces for mobile and web applications. Build reusable frontend code and libraries, translate user and business needs into functional solutions, debug and optimize applications, and collaborate with product management and user interaction designers. The role emphasizes end-to-end ownership, teamwork, adaptability, and converting ideas into implemented products.

Build and improve Restream’s web interfaces and user-facing features for the AI Clips team. Design UI and business logic, collaborate with product designers, participate in code reviews, improve system reliability, and evaluate emerging technologies. The role requires strong JavaScript and TypeScript expertise, advanced React knowledge, CSS preprocessor experience, and familiarity with backend development, cloud infrastructure, containers, and continuous deployment.

As a Frontend Engineer, you will build and enhance frontend solutions for financial configurations, develop internal tools, and create customer-facing interfaces, ensuring high performance and quality in financial applications.

Design and implement developer-facing UI from Figma to production using Hotwire (Turbo + Stimulus) and ViewComponents. Own the dashboard, API playgrounds, docs, marketing site, and data visualization. Optimize performance and bundle size, maintain a coherent component system, and ship polished, production-ready front-end with tests and CI/CD.

As a Senior Frontend Engineer, you'll create production-ready web components using React and TypeScript, optimize performance, and collaborate with teams to deliver complex UIs for AI applications.

Full-stack Developers at QuantCo build user interfaces for machine learning solutions, collaborating with data scientists and engineers to deliver actionable products.

Own end-to-end features across Java backends and a TypeScript/Angular frontend for a multi-tenant SaaS platform. Design APIs, schema and queries (MySQL/ClickHouse), build performant UIs, write unit/integration/e2e tests, deploy via containers/CI-CD, and integrate LLM/agentic workflows to help users find and fix data quality issues.

Lead frontend work on a TypeScript/Angular product, owning component architecture, state management, performance, and tests. Build data-dense UIs and Storybook-driven components, ship agentic (LLM) features, shape APIs and implement backend Java endpoints, write SQL, mentor engineers, and work directly with product, design, and customers to deliver end-to-end features.

Lead frontend engineering for AMBOSS's B2B Educator Tool: design and deliver features, set frontend best practices (testing, accessibility, performance), integrate AI coding agents into the workflow, collaborate with product and design, handle support requests, and mentor engineers to improve code health and delivery.

Join Cerebras Systems to optimize and develop frontend compiler infrastructure for PyTorch models on their unique wafer-scale AI platform, focusing on model representation and optimization.

Design and own the front-end ecosystem using TypeScript and React (Next.js), building responsive, accessible, and high-performance web apps for developer and enterprise users. Implement advanced state management, observability, testing (unit, integration, E2E), CI/CD, internal component libraries, and support real-time interactions (audio/streams). Troubleshoot production client-side issues and shape product UX and architecture.