Senior Fullstack Engineer (d/f/m)

Senior Fullstack Engineer – Consumer Selling (f/m/d)

About the team
Join the Consumer Selling team at mobile.de and help empower our customers to sell their vehicles easily, successfully, and with confidence. As a Senior Fullstack Engineer, you’ll be a key problem solver and collaborator, working closely with a diverse group of frontend and backend engineers, a data scientist, a product manager, and a UX designer – together, you’ll take ideas from discovery to delivery. This means researching user needs, designing solutions, shipping features, and ensuring they run smoothly in production. You’ll contribute across the stack, influence product decisions, and help shape engineering practices to improve performance, maintainability, and developer experience.

If you’re passionate about building user-centric solutions, we’d love to hear from you!

What you’ll do

• Collaborate actively with product, UX, business, and engineering peers

• Help shape our product from initial planning to successful launch

• Write clean, maintainable code with strong test coverage (unit, snapshot, and integration tests)

• Ensure the quality of your product because you understand that quality is the responsibility of the entire team

• Dedicate up to 30% of your time to maintaining code quality and driving platform improvements and best practices

• Stay up-to-date with industry trends. Learn new tech and non-tech related skills to grow yourself and your team

• Participate in design decisions, QA and code reviews

• Communicate effectively and contribute to a culture of knowledge sharing and continuous learning

Who you are

Your Qualifications

• 3+ years of professional experience as a Fullstack Developer (React, TypeScript, Java 21 with Spring Boot)

• Experience working in multidisciplinary agile teams, with a strong sense of ownership that extends beyond deployment

• Passion for writing clean, elegant code with a focus on simplicity and pragmatism

• An ambition to follow the technology trends and apply new technologies to our technical stack

• Strong communication skills and fluency in English

Backend Expertise

• Proficient in backend development with Java 21 , including hands-on experience with Spring Boot and Maven

• Solid experience designing and building scalable, maintainable applications using microservices architecture

• Expertise in developing and integrating RESTful APIs

• Solid understanding of NoSQL databases , particularly MongoDB

• Experience working with CI/CD pipelines (e.g., GitHub Actions)

• Familiarity with distributed, event-driven architectures using Kafka

Frontend Expertise

• Proficient in JavaScript (and TypeScript ), with a solid grasp of modern frontend development practices

• Hands-on experience with React.js (and Next.js including SSR, API routes), and core concepts such as hooks, context API, and component lifecycles

• Skilled in translating UI/UX designs from tools like Figma into responsive, pixel-perfect interfaces

• Understanding of frontend performance optimization and cross-browser compatibility

• Experience with frontend testing tools like Jest , Cypress or React Testing Library is a plus