Senior Fullstack Engineer (Go / Kotlin & React)

About the role

Merchant EMEA Engineering builds the technology that helps merchants join, grow and operate across the markets supported by Wolt and Deliveroo, which is now part of DoorDash. The team works on the merchant journey, including onboarding, analytics and recommendations, menu and order management, integrations and merchant applications. This role is based in the Berlin or Helsinki tech hubs on a hybrid basis; fully remote work, visa sponsorship and relocation support are not offered.

Key responsibilities

• Build and maintain production software across backend services and user-facing applications.
• Work on areas such as merchant onboarding, analytics, recommendations, menu and order management, integrations or merchant-facing tools.
• Develop reliable APIs, data models, services and user-facing features.
• Collaborate with product managers, designers, operations and other engineers to turn business needs into technical solutions.
• Own features from implementation through production and ongoing maintenance.
• Take part in technical design discussions and improve the quality, scalability, observability and maintainability of the systems.
• Use AI-assisted development tools effectively, evaluate their output and take ownership of the final solution.

Required profile

• Proven experience building production software in backend, frontend or fullstack environments at scale.
• Strong expertise in at least one area of the stack, with a willingness to contribute outside it.
• Comfortable working across boundaries, independently on well-scoped problems and collaborating with others.
• Good communication skills and a pragmatic, collaborative mindset.

Required skills

• Modern backend language such as Go, Kotlin, Java or similar, and/or frontend technologies such as TypeScript and React.
• Understanding of APIs, databases, testing and software design fundamentals.
• Nice to have: merchant-facing or operational tools, analytics or recommendation systems, marketplace technology, Kafka, streaming technologies, AWS, Kubernetes or Docker.