Senior Full Stack Developer (AI SaaS)
Clera · Cologne
Software EngineeringEngineeringFullTime
Clera is hiring a Senior Full Stack Developer (AI SaaS) in Cologne, North Rhine-Westphalia (full-time). Posted 17 October 2026. Apply directly on Clera's own careers site — no account needed.
About the Role
Join a European AI-powered B2B SaaS team building chat and voice agents that help customers navigate complex product ranges online and in stores. You will develop the platform and integrations behind these customer-facing experiences.
What You'll Do
Build and maintain full-stack features for an AI SaaS platform using TypeScript and NestJS.
Integrate current LLM APIs into chat and voice agent experiences.
Develop and support backend services and data workflows using MongoDB.
Contribute to product features that help customers search and make decisions across complex product catalogs.
What We're Looking For
Several years of professional experience with NestJS.
Very strong TypeScript skills and solid MongoDB experience.
Hands-on experience using current LLM APIs.
Based in Europe, or able to work in a hybrid arrangement from Cologne or Hamburg.
Compensation & Benefits
Visa sponsorship is not available.
Location
Remote across Europe, with hybrid options in Cologne or Hamburg. Primary location: Cologne, Germany.
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