Back End Developer

About PrimmoWe’re building the AI copilot for notaries and real-estate professionals, automating complex legal workflows and document analysis.

Our platform combines FastAPI, PostgreSQL, LLMs, and knowledge graphs to reduce transaction times by over 80%.Having reached early product-market fit, we’re now scaling rapidly — expanding data pipelines, integrations, and AI-powered document logic.

You’ll join a small, focused engineering team at the moment when product architecture still shapes the company’s future.

Role Overview

As Backend Engineer, you’ll build the core systems behind a high-trust, mission-critical product used daily by legal professionals.

You’ll work closely with our Lead Backend Engineer, Lead Frontend Engineer and Lead LLMEngineer to design APIs, improve performance, and ship new AI-driven features.

We iterate fast and value reliability, ownership, and clarity of thought.

• What You’ll DoDesign and ship clean, well-tested REST APIs using Fast
• APIImplement business logic for document processing and data flows
• Design and optimize PostgreSQL schemas and queries (SQLAlchemy)
• Integrate with third-party APIs (Stripe, HubSpot, OCR/AI providers)
• Contribute to background jobs and async pipelines (Celery, Redis)
• Write tests and CI pipelines ensuring reliability at scale
• What We’re Looking For
• Core

Technical Skills

• 3–5 years of backend development with Python
• Solid experience with Fast
• API (or Flask)
• Strong grounding in PostgreSQL and SQLAlchemy
• Skilled in REST API design, testing (pytest), and Git workflow
• Familiar with Docker, Google Cloud Tasks
• Bonus
• Integrations with Stripe, HubSpot, OCR, or AI APIsExperience with Azure or Google Cloud
• Background in document automation or legal tech
• Understanding of async programming and performance tuning
• Mindset
• You write maintainable, production-ready code
• You thrive in fast feedback loops and small teams
• You value clarity, precision, and accountability
• What You’ll Get
• Impact: Build the infrastructure behind a product handling real estate transactions worth millions.
• Learning: Collaborate with senior engineers working at the frontier of AI, data, and legal tech.
• Ownership: End-to-end responsibility on features that ship fast and matter.

Compensation

Competitive salary + stock options.

Environment: Based in Paris, flexible hybrid setup across EU time zones.

• Hiring Process
• Application — send your CV or LinkedIn + short intro
• Technical Take-Home — real-world challenge aligned with our stack
• Technical Interview — deep dive with our senior engineer
• Team Conversation — collaboration and culture fit
• Offer