Frontend Developer (m/f/d)

We are looking for a Frontend Engineer to turn complex audience-intelligence, marketing and data workflows into clear, reliable product experiences. You will help build the interfaces through which more than 300 organisations understand their customers, create campaigns and act on insights. Working closely with Product, Design, Backend and Data Science, you will own frontend work from shaping a solution through implementation, testing, release and iteration. This is a hands-on role for someone who combines strong React and TypeScript skills with product judgement, attention to detail and a pragmatic approach to shipping. Build and ship responsive, accessible and maintainable product experiences with React and TypeScript. Translate product requirements, designs and data or machine-learning capabilities into intuitive user workflows. Own frontend features end to end: technical design, implementation, testing, release and iteration. Create reusable components and modules, and improve the shared UI patterns used across our platform. Integrate with GraphQL and REST APIs, working with backend and data engineers on contracts, loading states, errors and edge cases. Maintain quality through code reviews, automated testing, monitoring and performance improvements. Collaborate closely with Product and Design, surface trade-offs early and help turn ambiguous problems into shippable solutions. Contribute to frontend architecture, tooling and development practices as the platform grows. What we are looking for in you: Approximately 2–5 years of professional experience building modern web applications. Strong practical knowledge of React, TypeScript, JavaScript, semantic HTML and modern CSS. Solid command of React fundamentals, including hooks, component composition and state management such as Redux. Experience building responsive, accessible interfaces with close attention to usability and detail. Experience testing frontend applications at unit, integration and end-to-end level. Confidence integrating APIs and handling asynchronous, data-rich user experiences. A collaborative, product-minded way of working and the ability to explain technical decisions clearly. Professional English. German is helpful, but not required. ‍ Helpful, but not required Experience with micro-frontend architectures or shared design systems. Experience with GraphQL. Familiarity with Python services such as FastAPI or Flask. Familiarity with Docker, CI/CD, AWS or infrastructure as code. Experience with data-heavy, AI-enabled, MarTech or AdTech products. Experience in a startup or another quickly changing product environment. You do not need to meet every item on this list. We care about the quality of your work, your judgement, your willingness to learn and the way you collaborate. What success looks like within your first six months You independently ship meaningful frontend features from definition to release. You make complex workflows easier for customers to understand and use. You strengthen the consistency, test coverage and maintainability of our frontend. Product, Design and Engineering trust you to surface risks, trade-offs and open questions early. We offer a hands-on environment at the intersection of data, AI and marketing, with real ownership and direct customer impact. Work with an international team across Product, Design, Engineering, Data Science, Marketing and Sales. Take ownership of varied product challenges with room to shape how we build. An attractive and competitive salary. A monthly learning budget. Support for an Urban Sports Club membership. Support for your preferred means of transport, including a new bike or public transport subscription. A startup office in one of Berlin’s cultural hubs. We welcome applicants with different backgrounds and experiences. If the role interests you but you do not meet every listed qualification, we still encourage you to apply and share with us why your are a great fit.