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

Additional information

• Recharge with 28 days of paid time off.
• Stay mobile with a €50 monthly transportation/mobility allowance.
• Keep growing with a development budget and access to coaching.
• Family first - enjoy up to 12 (non-birth parent) or 20 (birth parent) weeks of fully paid parental leave.
• Learn anytime, anywhere with our online and offline library.
• Get rewarded with an attractive base salary and participation in our annual incentive plans.
• Work from anywhere - up to 20 days per year from wherever you feel most productive.
• Prioritize your well-being with a 24/7 Employee Assistance Programme for you and your immediate family.

Company description

Founded in 1996, mobile.de disrupted the status quo of buying and selling cars as the first online vehicle marketplace.

Today, we are Germany’s largest vehicle marketplace with around 1.4 million listed cars, commercial vehicles, motorcycles and e-bikes. Both private customers and more than 40,000 registered vehicle dealers use the platform and benefit from 108 million customer visits per month. As a "one-stop shop”, mobile.de’s offering includes financing and leasing solutions in addition to buying and selling – and we will not stop innovating. If you are driven by an eagerness to learn and a passion for collaboration then we should get to know each other.

mobile.de is an equal opportunity employer and we value diversity. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status or disability status.

If you feel like you don’t meet all of the requirements for this role but are interested, please consider applying anyway. We strongly encourage people from historically excluded groups to apply.

What we offer

Meaningful Work: We are a diverse, international, highly skilled and passionate team committed to a world where people share more and waste less. Every day you will have the opportunity to make a huge difference for our users, customers as well as shape the future.

Embracing AI: We’re at the forefront of integrating cutting-edge AI technologies into our operations. Being part of mobile.de you will work with and learn about AI tools, contributing to projects that leverage AI to enhance efficiency, improve customer experiences, and drive our mission forward. With an AI-first mindset, we foster a culture of continuous learning and experimentation, empowering our team to explore and apply AI in meaningful ways for the company and themselves.

Growth and Development: We are a global organisation who truly believes in growing our people. To support this we offer lots of development and training opportunities and provide a budget for our team members.

Connection and Inclusion: Our culture is the glue that holds us together. We believe in making meaningful connections and creating an inclusive atmosphere with lots of opportunities to connect both in your day to day work and through social team activities (online and offline).