(Senior) Backend Engineer – Golang

The essentialsTeam: Product & EngineeringStart date: As soon as possibleLocation: Berlin — hybrid, 3 days in the officeWorking language: English (German: a plus)Salary band: Shared before your first interviewYour impactAs (Senior) Backend Engineer at Gymondo, you build and improve the scalable backend systems that power our platform for hundreds of thousands of active users. You work with a modern tech stack, establish new services using clean architecture principles, and help translate legacy concepts into maintainable, future-proof code. Your work directly shapes the technical foundation that enables Gymondo to grow — reliably, efficiently and at scale.What you’ll driveYou build, improve and maintain scalable backend services using Golang and Gin-Gonic, following clean architecture and established design patternsYou design and implement REST APIs following OpenAPI standards, with a focus on clarity, reliability and long-term maintainabilityYou contribute to our microservice architecture — working on reliability, scaling, stateless applications and event-driven systemsYou rebuild legacy concepts and translate them into well-known programming patterns with transparent and maintainable business logicYou develop data-driven features and are involved in all stages of the development process — from design to deploymentYou work on our scalable, automated infrastructure using AWS, Kubernetes and TerraformYou participate in peer code reviews, write unit tests and champion agile development practicesYou share knowledge, discuss better solutions openly and grow together with the teamWhat defines youMust-have4+ years of professional experience in backend-focused development, including infrastructure3+ years contributing to microservice architectures with a focus on reliability, scaling, stateless applications, event-driven systems and clean architecture3+ years designing REST APIs following OpenAPI standardsProven hands-on experience with Golang and Gin-GonicAbility to design