Senior Full Stack Engineer (m/f/d)

Help Shape How Millions Of Users Discover Products

Team Discover owns a core part of the customer journey at intersport.de: search, navigation, category pages, filters, and recommendations. Our work directly impacts how customers explore products and how the business grows.

We are a small, empowered product team with end-to-end ownership. That means we take responsibility for what we build and how it performs in production.

We are looking for a Senior Full Stack Engineer with strong frontend expertise who enjoys solving product-relevant problems, working across the stack, and taking real ownership.

What You Will Do

• Build and improve user-facing experiences across search, navigation, category pages, filters, and recommendations.
• Develop and maintain frontend applications with a strong focus on performance, scalability, and usability.
• Contribute to backend services, APIs, and event-driven systems where needed.
• Help shape technical decisions across architecture, tooling, and build vs. buy questions.
• Work closely with Product, Design, and Engineering to define and deliver impactful solutions.
• Take ownership from idea to production, including quality, performance, and operational stability.

What We Are Looking For

• Several years of experience building and shipping complex web applications.
• Strong frontend expertise with modern TypeScript-based frameworks.
• Solid full-stack engineering skills and willingness to work across frontend and backend.
• Experience with server-side rendering and performance-oriented web development.
• Good understanding of system design, APIs, databases, and cloud-based architectures.
• Product mindset and the ability to balance technical quality with business impact.
• Ability to ensure observability of systems in production, including metrics, logging, tracing, and alerting.
• Experience with backend technologies such as Kotlin / Spring Boot, event-driven systems (e.g., Kafka), and cloud environments (AWS), or strong ability to ramp up quickly.
• High level of ownership, self-direction, and comfort working in an autonomous team.
• Strong communication skills in German and English.

Nice to Have

• Experience with microfrontend architectures.
• Experience with Kotlin, Spring Boot, Kafka, PostgreSQL, or DynamoDB.
• Experience with AWS and infrastructure as code.
• Experience in e-commerce or product discovery environments.
• Experience using AI tools pragmatically to improve development workflows, productivity, and code quality.

Our Current Tech Stack

• Frontend: Preact, Vite, SSR, TypeScript, PostCSS, microfrontends
• Backend: Kotlin, Spring Boot, Kafka, PostgreSQL, DynamoDB
• Infrastructure: AWS, Pulumi, GitLab CI/CD
• Tooling: Datadog, Algolia, Unleash, Vitest, Playwright

You do not need to match every technology in our stack. We care more about strong engineering fundamentals, curiosity, and the ability to learn.