Senior BackEnd Engineer (Node.js / TypeScript) Job in Europe

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Description

Senior BackEnd Engineer (Node.js / TypeScript). €60k to €80k gross/year Hybrid job Tech industry Europe Job ref47460 Post DateOctober 15, 2026 Senior Back-End Engineer (Node.js / TypeScript) Location: Sofia, Bulgaria Work model: Hybrid About the Opportunity Our client is an international technology company providing B2B software solutions for the online sports betting and iGaming industry, developing scalable sportsbook platforms for gaming operators worldwide. The Role We’re looking for a backend-focused JavaScript developer to build and maintain API-driven applications within a microservices architecture using Node.js, TypeScript, NestJS, MongoDB, and Apache Pulsar. You’ll collaborate with engineers to develop new features, optimize performance, and ensure backend systems remain reliable and scalable. Key Responsibilities Develop and maintain backend services and APIs. Collaborate with the engineering team to deliver new features. Optimize application performance and scalability. Troubleshoot issues and identify effective solutions. Write clean, maintainable code and contribute to backend architecture improvements. Required Experience and Skills 5+ years of experience with Node.js. 5+ years of experience with JavaScript, including ES6+ features. Solid experience with the NestJS framework. Good understanding of REST API design and development. Strong analytical thinking and problem-solving capabilities. Effective communication and collaboration skills. Good written and spok

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