Senior Backend Developer (Node.Js)
Core
Building and maintaining scalable APIs and systems for a fitness platform serving millions of users across Europe.
Role type
Senior Backend Developer (Node.js)
Builds
APIs, platform infrastructure, and features for a fitness membership and workout tracking app.
Domain
Fitness / Health Tech / SaaS
Deliverable
production ML models | product features | infrastructure
Required skills
Node.js, TypeScript, Nest.js, Postgres, Redis, Azure EventGrid, Azure ServiceBus, Heroku, API design, SLO definition, architectural design, security, privacy, performance optimization, AI tooling adoption
Preferred skills
Experience with React ecosystem, knowledge of AI in development, ownership mindset, risk management
Technologies
Nest.js, TypeScript, Prisma, Postgres, Redis, Azure EventGrid, Azure ServiceBus, Heroku, Azure DevOps, New Relic, Akamai, GitHub Copilot
Responsibilities
Building and maintaining high-scale APIs, defining Service Level Objectives, driving structural improvements, supporting teams with documentation and architectural design, co-shaping the engineering roadmap, co-owning non-functional topics like security and performance, driving AI adoption in development
Seniority
Senior, hands-on IC with strategic influence
