Senior Backend Engineer

We are looking for a highly experienced Senior Backend Engineer to join an innovative and fast-growing company in the fitness tech industry.You will play a key role in building and scaling the backend architecture of a cutting-edge platform used by gyms across Europe. This is an exciting opportunity to work in a startup environment where your ideas, ownership, and technical expertise will have a direct impact on the product and customers.About the MissionYour mission will be to build and evolve the platform from the ground up, leveraging the experience acquired during the Beta phase and current product usage.You will work closely with product, customers, and the engineering team to deliver a scalable, reliable, and high-performance application.ResponsibilitiesDesign and implement scalable backend architectures and server-side application logicDevelop APIs, reusable libraries, and core system componentsIntegrate with external Gym Management Software and third-party servicesCollaborate closely with customers to gather feedback and solve technical issuesWrite clean, maintainable, and well-tested codeParticipate in technical decisions and mentor less experienced developersWork directly with clients for product conception and training purposesTravel occasionally across Europe to better understand gym staff workflows and operational needsContribute to building a responsive, cost-effective, and customer-centric platformRequired Skills & Experience10+ years of experience building backend systemsAt least 1 year of experience with Node.js and TypeScriptStrong experience with SQL databases, ideally PostgreSQLExperience working with Prisma ORMStrong sense of ownership and code qualityExperience writing automated testsAbility to learn quickly and adapt in a startup environmentExcellent communication skills with fluent English (C1 level)Customer-focused mindset and passion for delivering outstanding user experiencesTeam player willing to share knowledge and mentor othersNice to HaveExperience with AWS services and AWS LambdaExperience with Serverless architecturesExperience building GraphQL APIsAdditional European languagesPassion for fitness or regular sports practiceTech StackNode.jsTypeScriptPostgreSQLPrisma ORMAWSGraphQLWhat We OfferSalary: €50,000 - €55,000 gross/yearFully remote workSport card / fitness benefitPrivate medical insuranceInternational and collaborative environmentOpportunity to shape a product from an early stage

10+ years of experience building backend systems At least 1 year of experience with Node.js and TypeScript Strong experience with SQL databases, ideally PostgreSQL Experience working with Prisma ORM Strong sense of ownership and code quality Experience writing automated tests Ability to learn quickly and adapt in a startup environment Excellent communication skills with fluent English (C1 level) Customer-focused mindset and passion for delivering outstanding user experiences Team player willing to share knowledge and mentor others Nice to Have Experience with AWS services and AWS Lambda Experience with Serverless architectures Experience building GraphQL APIs Additional European languages Passion for fitness or regular sports practice Tech Stack Node.js TypeScript PostgreSQL

GraphQL What We Offer Salary: €50,000 - €55,000 gross/year Fully remote work Sport card / fitness benefit Private medical insurance International and collaborative environment Opportunity to shape a product from an early stage