Clera

Senior Full Stack Developer (AI SaaS)

Cologne

Level: Senior
Work type: On-site · Cologne
Visa: Not offered

Not stated in the posting: salary.

Open. First seen 17 October 2026.

Apply on the company's site →

What this role asks for

Particular to this role

MongoDB · Nest.js

Rare in Clera's other 299 open postings.

Standard for full stack roles

TypeScript

Common in full stack postings at any company.

Read against Clera's other open postings on this site.

The team: Engineering HIRES STEADILY

This role is one of 292 open in Engineering. 226 were posted in the last 30 days and the oldest in March: a team that hires all year rather than one being built.

WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS

LLM (135 of 292), TypeScript (131 of 292), Python (123 of 292), React (107 of 292), Machine Learning (70 of 292), PostgreSQL (58 of 292), JavaScript (55 of 292)

OTHER ROLES ON THIS TEAM

Senior Full-Stack Developer (Backend Focus) posted Oct 18
Strategy & Operations Associate, Product Growth posted Oct 18
Founding Engineer posted Oct 18
Senior AI Engineer posted Oct 18
Founding Product Designer/Engineer posted Oct 18
Founding Engineer, AI and Geometry/CAD posted Oct 18
Senior Data Engineer posted Oct 18
Founding Engineer posted Oct 18
Founding Product Engineer posted Oct 18
Agent Product Manager posted Oct 18
Founding Forward Deployed Engineer posted Oct 18
Fractional Founding Designer posted Oct 18
Software Engineer, Foundation (Mid-Level) posted Oct 18
Senior Solutions Engineer posted Oct 18
Product Engineer (Mid to Staff Level) posted Oct 18
Lead Data Platform Engineer posted Oct 18
Senior Forward Deployed Engineer posted Oct 18
Senior Product Engineer posted Oct 18
AI Infrastructure / Product Engineer posted Oct 18
Director of IT posted Oct 18
Robotics Engineer, Autonomous Systems posted Oct 18
Senior Data Engineer posted Oct 17
Senior Platform Software Engineer posted Oct 17
Senior Product Designer posted Oct 17
Senior Platform Engineer (w/m/d) posted Oct 17
Senior Product Manager posted Oct 17
Senior Data Scientist posted Oct 17
Senior Software Engineer, Voice AI / Backend posted Oct 17
Founding Engineer posted Oct 17
Senior Legal Engineer posted Oct 17
GTM Engineer posted Oct 17
Senior Forward Deployed Engineer posted Oct 17
Founding Engineering Lead posted Oct 17
Member of Technical Staff posted Oct 17
Technical Sales / Business Development Manager, Ingredients posted Oct 17
Founding Product Designer posted Oct 17
Entry-Level Robot Learning Engineer posted Oct 17
Senior QA Engineer posted Oct 17
Senior Product Engineer posted Oct 17
AI-Native Founding Chief of Staff posted Oct 17
Computer Vision & Robotics Intern posted Oct 17
GTM Engineer (Mid-Level) posted Oct 17
Mid-Level Robotics Engineer, Autonomous Systems posted Oct 17
Founding DevOps Engineer posted Oct 17
Founding Product Engineer posted Oct 17
Senior Founding Product Engineer posted Oct 16
Senior Integration Engineer posted Oct 16
AI-Native Founding GTM Lead posted Oct 16
Founding Engineer posted Oct 16
Senior Member of Technical Staff, Agents posted Oct 16
AI Engineer (Mid-Level) posted Oct 16
Senior Member of Technical Staff posted Oct 16
Founding Applied AI Engineer posted Oct 16
Senior Forward Deployed Engineer posted Oct 16
Founding Product Engineer posted Oct 16
Agent Engineer posted Oct 16
Senior Product Engineer posted Oct 16
Senior Applied AI Engineer posted Oct 16
Founding Forward Deployed Engineer posted Oct 16
Senior/Staff Software Engineer, Platform posted Oct 16
Founding Engineer, Computer Vision & Robotics posted Oct 16
Product Engineer posted Oct 16
Mid-Level GTM Engineer posted Oct 16
Robotics Engineer, Autonomous Systems (Mid-Level) posted Oct 16
Senior Member of Technical Staff posted Oct 16
Software Engineer, Mid-Level posted Oct 15
Senior Product Engineer posted Oct 15
Founding Product Designer posted Oct 15
Founding Engineer posted Oct 15
Backend Engineer posted Oct 15
Founding Engineer posted Oct 15
Mid-Level Platform Engineer (Kubernetes) posted Oct 15
Senior Silicon Engineer posted Oct 15
Senior Product Manager, SMB Platform posted Oct 15
Senior Product Manager, Banking posted Oct 15
Founding Machine Learning Engineer posted Oct 15
Founding Technical Partnerships Lead posted Oct 15
Founding Software Engineer posted Oct 15
Senior Product Designer posted Oct 15
Founding Design Engineer posted Oct 15
Senior Technical Product Manager posted Oct 15
Founding Engineer, Infrastructure posted Oct 15
Founding Product Manager posted Oct 15
Senior Founding Backend Engineer posted Oct 15
Research Engineer, Mid-to-Senior posted Oct 15
Senior MTS Software Engineer posted Oct 15
Founding Engineer posted Oct 15
Founding ML Research Engineer posted Oct 15
Founding DevOps Engineer posted Oct 15
Founding Product Engineer posted Oct 15
Machine Learning Engineer (Mid-Level) posted Oct 15
Founding DevOps Engineer posted Oct 14
Founding Backend Engineer posted Oct 14
Founding ML Research Engineer posted Oct 14
Founding Product Engineer posted Oct 14
Technical Operations Lead posted Oct 14
Founding Engineer (Full Stack) posted Oct 14
Founding Engineer posted Oct 14
Associate Fullstack Engineer posted Oct 14
Backend Engineer (Mid-Level) posted Oct 14
Founding Forward Deployed Engineer posted Oct 14
Founding Engineer posted Oct 14
Product Engineer, Mid-Level posted Oct 14
Forward Deployed Engineer, Early Career posted Oct 14
Founding Engineer posted Oct 14
Product Engineer (Mid-Level) posted Oct 14
Founding Forward Deployed Engineer posted Oct 14
Talent AI Operator posted Oct 14
Senior Android Software Engineer posted Oct 14
GTM Engineer posted Oct 14
Senior Fullstack Engineer posted Oct 14
Mid-Level Platform Engineer, Biotech posted Oct 14
Technical Writer posted Oct 14
Founding Software Engineer posted Oct 13
Lead Research Engineer, Data Quality posted Oct 13
Senior Engineer, Europe to San Francisco posted Oct 13
Principal AI Architect posted Oct 13
Founding Engineer, Full-Stack/AI (m/w/d) posted Oct 13
Founding Engineer posted Oct 13
Senior Full-Stack Software Engineer, Design posted Oct 13
Technical Chief of Staff posted Oct 13
Founding Engineer, NLP Systems & Infrastructure posted Oct 13
Senior Integrations Engineer posted Oct 13
Founding Product Engineer posted Oct 13
Founding Cloud Infrastructure Engineer posted Oct 13
Senior Agent Product Manager posted Oct 13
Founding Product Engineer posted Oct 13
Founding Engineer posted Oct 13
Mid-Level Product Engineer posted Oct 13
Founding Engineer posted Oct 13
Founding Data Engineer (Pricing/Comps) posted Oct 13
Senior Technical Program Manager posted Oct 13
Research Engineer, Privacy and Anonymization (Mid-Level) posted Oct 13
Research Engineer, QC Automation posted Oct 13
Senior Full-Stack Software Engineer, Reinforcement Learning posted Oct 13
Senior Software Engineer, Infrastructure posted Oct 13
Mid-Level Research Engineer, Benchmarks posted Oct 12
Senior Security Engineer posted Oct 12
Research Engineer, Synthetic Data (Mid-Level) posted Oct 12
Mid-Level GTM Engineer posted Oct 12
Mid-Level Forward Deployed Research Engineer posted Oct 12
Founding ML Engineer, Computer Vision (Object Detection) posted Oct 12
Senior Member of Technical Staff posted Oct 12
Mid-Level Product Engineer posted Oct 12
Founding Hardware Engineer posted Oct 12
US Founding Engineer posted Oct 12
Founding RL Engineer posted Oct 12
Senior Product Engineer posted Oct 12
Senior Backend Engineer posted Oct 12
Senior Freelance Product Designer (Fractional) posted Oct 12
Staff Engineer, Agentic AI posted Oct 12
Senior Robotic Systems Engineer posted Oct 12
Deployment Strategist / Success Engineer posted Oct 12
Founder's Associate, Product posted Oct 12
Founding Product Engineer posted Oct 12
Founding Electrical Engineer posted Oct 11
Principal Product Manager, AI Platform posted Oct 11
Senior Pricing Architect posted Oct 11
Lead Product Designer posted Oct 11
Founding Engineer (AI/ML) posted Oct 11
Forward Deployment Engineer posted Oct 11
Senior Product Engineer posted Oct 11
Founding Engineer (Applied AI) posted Oct 11
Lead AI Engineer, Agents & Infrastructure posted Oct 11
AI/ML Engineer posted Oct 11
Founding Agentic Engineer posted Oct 11
Founding GTM Engineer posted Oct 11
Senior Full-Stack Developer, Backend Focus posted Oct 11
Strategy & Operations, Product Growth Associate posted Oct 11
Founding Engineer posted Oct 11
Senior AI Engineer posted Oct 11
Founding Product Designer/Engineer posted Oct 11
Founding Engineer (AI and Geometry/CAD) posted Oct 11
Senior Data Engineer posted Oct 11
Founding Engineer posted Oct 10
Founding Product Engineer posted Oct 10
Senior Software Engineer posted Oct 10
Agent Product Manager posted Oct 10
Senior Forward Deployed Engineer posted Oct 10
Fractional Founding Designer posted Oct 10
Software Engineer, Foundation posted Oct 10
Senior Solutions Engineer posted Oct 10
Product Engineer, Mid-Level to Staff posted Oct 10
Lead Data Platform Engineer posted Oct 10
Senior Forward Deployed Engineer posted Oct 10
Senior Product Engineer posted Oct 10
Senior Platform Engineer posted Oct 10
Senior Product Manager posted Oct 10
Developer Relations Engineer posted Oct 10
Senior Data Scientist posted Oct 10
Senior Software Engineer, Voice AI / Backend posted Oct 10
AI Infrastructure / Product Engineer posted Oct 10
Founding Engineer posted Oct 10
Legal Engineer posted Oct 10
Junior to Mid-Level GTM Engineer posted Oct 10
Senior Forward Deployed Engineer posted Oct 10
Founding Engineering Lead posted Oct 10
Full Stack Developer (AI SaaS) posted Oct 10
Director of IT posted Oct 10
Senior Member of Technical Staff posted Oct 10
Technical Sales / Business Development Manager posted Oct 10
Founding Product Designer posted Oct 10
Entry-Level Robot Learning Engineer posted Oct 10
QA Engineer posted Oct 10
Senior Product Engineer posted Oct 10
AI-Native Founding Chief of Staff posted Oct 10
Senior Founding Product Engineer posted Oct 10
Senior Integration Engineer posted Oct 10
AI-Native Founding GTM Lead posted Oct 10
Founding Engineer (Europe) posted Oct 10
Member of Technical Staff, Agents posted Oct 10
Mid-Level AI Engineer posted Oct 10
Senior Member of Technical Staff posted Oct 10
Founding Applied AI Engineer posted Oct 10
Senior Forward Deployed Engineer posted Oct 10
Founding Product Engineer posted Oct 10
Computer Vision & Robotics Intern posted Oct 10
Senior Agent Engineer posted Oct 10
Senior Product Engineer posted Oct 10
Senior Applied AI Engineer posted Oct 10
Founding Forward Deployed Engineer posted Oct 10
Senior/Staff Software Engineer, Platform posted Oct 10
Machine Learning Engineer (Mid-Level) posted Oct 10
Founding Engineer, Computer Vision & Robotics posted Oct 10
Product Engineer, Mid-Level posted Oct 8
GTM Engineer posted Aug 10
Founding AI Engineer posted Aug 5
Senior Product Manager, Growth posted Aug 1
Technical Product Marketing Manager, Mechanical Engineering posted Aug 1
Pricing Architect posted Aug 1
Founding Design Engineer posted Aug 1
Founding Full Stack Engineer posted Aug 1
Founding AI Engineer posted Aug 1
Founding Product Engineer posted Aug 1
Founding AI Engineer posted Aug 1
Founding Forward Deployed Engineer posted Jul 18
Founding Engineer: Agent Infrastructure posted Jun 7
Frontend Engineer posted Jun 3
Head of Engineering posted Jun 3
Senior AI/ML Engineer posted Jun 3
Founding Engineer - Full Stack posted Jun 3
Product Engineer (Software Engineer) posted Jun 3
Platform Engineer (Kubernetes) posted Jun 3
Founding Engineer posted Jun 3
Founding Engineer posted Jun 3
Senior Android Software Engineer posted Jun 3
Founding Engineer posted Jun 3
Founding Engineer posted Jun 3
Founding Software Engineer posted Jun 3
Senior/Staff Software Engineer (Platform) posted Jun 3
Forward Deployed Engineer (Founding Customer Engineer) posted Jun 3
Software Engineer - Full Stack posted Jun 3
Backend-Leaning Product Engineer posted Jun 3
Founding Engineer Intern posted Jun 3
Founding Engineer posted Jun 3
Founding Full Stack Engineer posted Jun 3
Founding Engineer posted Jun 3
Frontend Engineer - Cluster OS Platform posted Jun 3
Medical AI Researcher posted Jun 3
Staff Engineer - Agentic AI posted Jun 3
Founding Engineer posted Jun 3
AI/ML Engineer posted Jun 3
Member of Technical Staff posted Jun 3
Founding Product Engineer posted Jun 3
Founding Engineer (Full-Stack) posted Jun 3
AI Engineer (Mid-Level) posted Jun 3
Applied AI Engineer (Matching & Search) posted Jun 3
Founding Engineer ($3M pre-seed) posted May 31
Founding Engineer ($3M pre-seed) posted Mar 23
Founding Engineer ($3M pre-seed) posted Mar 23
Founding Engineer ($3M pre-seed) posted Mar 23
Founding Engineer ($3M pre-seed) posted Mar 23
Founding Engineer ($3M pre-seed) posted Mar 23
Founding Engineer – SF Hackerhouse (Visa sponsored; $3M pre-seed) posted Mar 23
Member of Technical Staff / Fullstack Engineer posted Mar 23
Founding Engineer ($3M pre-seed) posted Mar 23
Founding Engineer ($3M pre-seed) posted Mar 23
Founding Engineer – SF Hackerhouse (Visa sponsored; $3M pre-seed) posted Mar 23
Founding Engineer ($3M pre-seed) posted Mar 23
Founding Engineer ($3M pre-seed) posted Mar 23
Founding Engineer ($3M pre-seed) posted Mar 23
Founding Engineer – SF Hackerhouse (Visa sponsored; $3M pre-seed) posted Mar 23
Founding Engineer – SF Hackerhouse (Visa sponsored; $3M pre-seed) posted Mar 23
Founding Engineer – SF Hackerhouse (Visa sponsored; $3M pre-seed) posted Mar 23
Founding Engineer – SF Hackerhouse (Visa sponsored; $3M pre-seed) posted Mar 23
Founding Engineer – SF Hackerhouse (Visa sponsored; $3M pre-seed) posted Mar 23
Founding Engineer – SF Hackerhouse (Visa sponsored; $3M pre-seed) posted Mar 23
Founding Engineer – SF Hackerhouse (Visa sponsored; $3M pre-seed) posted Mar 23
Founding Engineer ($3M pre-seed) posted Mar 23
Founding Engineer ($3M pre-seed) posted Mar 23
Founding Engineer ($3M pre-seed) posted Mar 23

From the team and dates on Clera's own job board.

About the role

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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