Senior Backend Developer

A fast-growing, Series A-backed AI search analytics company in Berlin is looking for a Senior Backend Developer to architect and build the systems that power its AI-driven recommendations platform. You’ll work at the intersection of scalable backend engineering and cutting-edge AI integrations, collaborating closely with product, data, and frontend teams to deliver reliable, high-performance insights for marketing teams worldwide., * Architect and build backend systems powering AI-driven recommendations.

• Design, implement, and maintain scalable APIs, data pipelines, and databases delivering reliable analytics insights.
• Collaborate with product, data, and frontend teams to translate requirements into robust technical solutions.
• Develop and maintain automated tests and CI/CD pipelines to ensure quality and rapid delivery.
• Integrate with AI model APIs (OpenAI, Claude, Perplexity, Gemini, Llama) to support real-time recommendations.
• Ensure security, authentication/authorization, and data privacy across backend services.
• Implement end-to-end changes across backend services with clean, maintainable code.
• Build and scale REST/GraphQL APIs and data models to support AI-driven product features.
• Actively leverage AI-assisted developer tools (e.g. Cursor) to enhance productivity while keeping committed code concise and clear.

Formal degrees or fixed years of experience are not required - demonstrated excellence and the ability to move fast are what matter most., Required:

• Deep proficiency in TypeScript.
• Hands-on experience with the core stack: GCP (Cloud Functions, Cloud Tasks), PostgreSQL, Firestore.
• Experience integrating with AI model APIs such as OpenAI, Claude, Perplexity, Gemini, and/or Llama for real-time use cases.
• Strong system design and architectural decision-making abilities.
• Experience designing and building scalable REST and/or GraphQL APIs, data pipelines, and data models.
• Experience implementing automated testing (unit/integration) and CI/CD pipelines.
• Solid knowledge of security best practices, authentication/authorization, and data privacy.
• Ability to match the code style of an existing codebase and implement changes end-to-end.
• Excellent collaboration skills across product, data, and frontend teams.
• A demonstrated track record of exceptional performance or notable achievements in past projects.
• Willingness to work on-site full-time in Berlin, including extended hours when needed.

• Salary: €75,000 - €120,000 per year, depending on experience.
• Work at the cutting edge of AI and search analytics in a high-growth, well-funded startup environment.