A career driven by you. At LeasingMarkt.de, we bring customers and dealers together to make car leasing more accessible, transparent, and efficient. With over 1,000 partner dealerships and nearly 2 million users across the DACH region and the Netherlands, we’ve become Germany’s #1 leasing platform. To keep growing and driving innovation in the mobility space, we’re looking for a Senior Software Engineer to join our high-performance team at our Düsseldorf office. 

As a Senior Software Engineer, you will play a key role in designing and developing robust, scalable applications that power one of the largest automotive leasing marketplaces in Europe. You’ll collaborate with a cross-functional team to build and evolve solutions that are architecturally sound, easy to maintain, and built for long-term impact. You’ll help shape technical direction while raising the bar for software quality and stability across the platform. 

What you’ll do:

• Join one of our builders’ teams to build great products loved by our customers. 
• Apply an AI-first mindset to every phase of you-build-it-you-run-it: from design and coding to testing, deployment and operations.
• Work hands-on in real product codebases (for example TypeScript/Node/Next.js or Java/Spring), using GenAI tools to accelerate development, improve quality and simplify existing systems.
• Build and evolve AI-powered internal tools and workflows (assistants for coding, reviews, documentation, testing) that engineers across AutoScout24 can rely on every day.
• Act as a multiplier and culture driver: coach teams on effective GenAI usage, share patterns and anti-patterns, and help establish AI-first ways of working across our engineering organization.
• Experiment, measure and improve: run small, data-informed experiments with teams, learn what works in our context, and turn successful approaches into repeatable standards and playbooks. 

What you’ll bring: 

• Experience leveraging AI and Generative AI (GenAI) to enhance engineering productivity — including code generation, debugging, reviews, documentation, and decision support — with a proactive mindset toward adopting tools that streamline development and drive innovation. 
• Deep, hands-on experience building production systems (we expect you’ve spent at least 5 years doing this, possibly much more), ideally with PHP and Laravel as well as TypeScript/Node.js/Next.js on AWS, Azure or GCP.
• Demonstrated personal excellence in using GenAI coding tools (for example GitHub Copilot, ChatGPT, Claude Code, Cursor, OpenAI Codex) to significantly improve your own development speed and quality: code generation, refactoring, debugging, tests and documentation. 
• Experience integrating LLM APIs (such as OpenAI, Anthropic, Azure OpenAI, Vertex AI or similar) into applications or internal tools.
• Strong communication and influencing skills: you can introduce new tools and practices, align stakeholders, handle skepticism and iterate based on feedback.
• A curious, growth-oriented mindset: you actively seek out new practices and tools, you are comfortable learning in public, and you help others do the same.
• A pragmatic view of GenAI: you understand its limitations and risks and know how to put guardrails in place (reviews, tests, policies) to keep usage safe, compliant and sustainable at scale.
• Experience with performance optimization, caching strategies, and system observability is a plus. 

A culture of growth  

With over 50 nationalities represented, we’re proud to welcome people of all backgrounds to our growing community, and we’re always finding new ways to help people feel welcomed and included. Here, you’ll have the tools, training and support you need to work in a way that suits you, learn new skills and reach your potential.  

For a career where you can drive our business and shape your future, apply now. 

Join us as a (Senior) Full Stack Developer - Web (f/m/d) in Berlin 

Our Story 

We are looking for a Senior Full Stack Developer (Web Platform) to help shape and scale think-cell’s web platform and enable multiple teams to efficiently manage and publish content.

This is not a role for someone who only wants to work within a fixed web stack or maintain existing templates. We are looking for a web engineer who enjoys solving complex technical problems, making sound architectural decisions, and building systems that remain robust and maintainable as requirements evolve.

You will work across frontend and backend, improve the technical foundation of our web platform, and help us build scalable solutions that enable our teams to manage and publish content. Along the way, you will collaborate closely with stakeholders across design, marketing, product and engineering but with strong ownership over technical quality, long-term maintainability, and the overall direction of the platform.

 Our Values

As part of our team, you will embody and help shape the following principles that define us:

• Forward Thinking: We embrace change and challenge the status quo.

• Ownership: We take pride in our work and learn from our mistakes.

• Customer First: We prioritize delivering lasting value.

• Unified Team: We foster collaboration, respect, and integrity.

• Strive for Excellence: We set ambitious goals and pursue quality.

What you will do

• Design, build, and evolve our web platform features across front-end and CMS back-end.
• Solve complex technical problems in a pragmatic way, balancing speed of delivery with long-term maintainability
• Drive architectural improvements that make our web ecosystem more robust, scalable, and easier to work with
• Build and improve our back-end functionality in PHP and Laravel for integrations, dynamic features, and internal tooling
• Extend and optimize our CMS and publishing workflows to support efficient content operations without compromising technical quality
• Improve performance, Core Web Vitals, accessibility, and technical SEO foundations across the platform
• Work on the evolution of our current web architecture, while also challenging existing approaches when better solutions exist
• Collaborate with design, marketing, product, and engineering teams to turn business requirements into well-structured technical solutions
• Interface with back-end systems written in C++, ensuring reliable and efficient data exchange across system boundaries
• Identify opportunities to improve developer experience, reduce complexity, and raise the overall engineering standard of the platform
• Take ownership of technical tasks and help define best practices for modern web development at think-cell

What we are looking for

• Strong experience building and shipping production-grade web platforms, applications, or systems
• A proven ability to solve non-trivial technical problems and work confidently in complex web related codebases
• Strong full stack engineering skills, with solid backend experience in PHP, Laravel, or similar technologies and a frameworks
• Strong frontend fundamentals, including HTML, CSS, JavaScript and modern approaches to building maintainable user interfaces
• Good judgment when making architectural and technical trade-offs
• A pragmatic mindset: you know when to build for flexibility and when to keep things simple
• Curiosity and confidence to work with unfamiliar technologies or domains when needed
• A strong sense of ownership and responsibility for code quality, maintainability, and technical outcomes
• Experience collaborating across disciplines and communicating clearly with technical and non-technical stakeholders in English

Nice to have

• Experience with Statamic CMS
• Experience with static site generation challenges
• Experience with Deployment Tools such as Jenkins or similar tools
• Familiarity with Tailwind, Alpine.js, or similar frontend tools
• Experience improving performance-critical, SEO-relevant, or content-heavy platforms
• Familiarity with Python for automation or tooling
• Experience integrating with non-web backend systems or services

Why is think-cell the right place for you? 

think-cell is a profitable, fast-paced software company based in Berlin. Our products simplify and enhance PowerPoint, used by over 1.3 million professionals worldwide including top consulting firms and global corporations. 

We prioritize code quality, elegant algorithms, and a refined user experience. Owned and led by computer scientists, think-cell offers a developer-focused environment that attracts and retains top engineering talent.