Senior Backend Developer

About the role

About the Role A fast-growing, Series A AI search analytics SaaS company based in Berlin is looking for a Senior Backend Developer to architect and build the systems powering its AI-driven recommendation engine. You'll work at the intersection of scalable infrastructure and cutting-edge AI integrations, collaborating closely with product, data, and frontend teams to ship reliable, high-quality software. This is a fully on-site role (Berlin office, 5 days/week). The company operates in the AI/ML space, helping marketing teams track, analyze, and optimize brand performance across AI search platforms. Backed by Series A funding and trusted by thousands of brands and agencies, the team is scaling quickly and looking for engineers who thrive in a high-ownership, fast-moving environment. What You'll Do Architect and build backend systems that power real-time AI-driven recommendations. Design, implement, and maintain scalable REST and GraphQL APIs, data pipelines, and database models. Integrate with AI model APIs (OpenAI, Claude, Perplexity, Gemini, Llama, and others) to support live recommendation features. Develop and maintain automated tests (unit and integration) and CI/CD pipelines to ensure quality and rapid delivery. Enforce security best practices, authentication/authorization, and data privacy across backend services. Implement end-to-end changes across backend services with clean, maintainable, well-styled code. Translate product and data requirements into robust technical specifications and solutions. Leverage AI-assisted development tools (e.g., Cursor) to enhance productivity while keeping committed code concise and maintainable. What We're Looking For Required: Deep proficiency in TypeScript . Hands-on experience with Google Cloud Platform (GCP) , including Cloud Functions, Cloud Tasks, PostgreSQL, and Firestore. Proven experience designing and building scalable REST and/or GraphQL APIs and data pipelines for AI-driven features. Experience integrating with AI model APIs (OpenAI, Claude, Perplexity, Gemini, Llama, etc.) for real-time use cases. Strong system design and architectural decision-making skills. Experience implementing automated testing (unit/integration) and CI/CD pipelines. Knowledge of security best practices, authentication/authorization, and data privacy in backend services. Ability to match an existing codebase's style 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. Nice to Have: Experience with AI productivity tooling (e.g., Cursor or similar). Background at companies working in AI/ML infrastructure, LLM tooling, or marketing analytics SaaS. Visa sponsorship: Not available. Candidates must be authorized to work in Germany. Compensation & Benefits Salary: $75,000 – $120,000 USD annually (or equivalent), depending on experience. High-ownership role with meaningful impact on a core product used by thousands of brands and agencies. Work with a technically strong, fast-moving team on problems at the frontier of AI search. Location Berlin, Germany — fully on-site, 5 days per week. Remote work is not available for this role.