QA Engineer San Francisco & Paris

QA Engineer — Engine Reliability & Bug Fixing

Paris & San Francisco (Remote / Hybrid)

Contract: 2-Month Freelance Mission (Path to Full-time Founding Engineer)

The Mission

Your role is simple: find every bug, understand it deeply, and fix it fast.

If this mission is a success, the goal is to convert this into a full-time Founding Engineer role.

What you'll do

• Break the system relentlessly: Design and execute aggressive testing strategies to uncover edge cases, inconsistencies, and failures across the entire pipeline (LLMs -> DSL -> 3D engine).
• Own bug fixing end-to-end: Identify, reproduce, debug, and fix issues directly in the codebase — not just report them.
• Build testing infrastructure: Create automated test suites, validation pipelines, and regression systems to ensure stability as we iterate fast.
• Test AI-driven systems: Validate outputs from LLMs (Claude, Gemini), ensuring consistency, determinism, and correctness when translated into game logic and 3D environments.
• Stress test agentic workflows: Push multi-agent systems to their limits, identify failure modes, and harden the system against unpredictable behaviors.
• Collaborate tightly with engineers: Work side-by-side with AI and 3D engineers to quickly diagnose issues and ship fixes in real time.
• Improve product quality at speed: Ensure we can ship fast without breaking everything.

You might be a fit if...

• You have a strong track record in QA or engineering roles where you owned product reliability and stability.
• You are obsessed with edge cases, weird bugs, and breaking systems.
• You have experience testing complex systems (APIs, AI systems, game engines, or distributed systems).
• You are comfortable working with AI outputs and understand their non-deterministic nature.
• You know how to build automated tests (unit, integration, end-to-end).
• You move fast, think clearly under pressure, and prioritize impact over perfection.
• Your personal workflow is highly technical and AI-augmented.
• Language: You are perfectly fluent in English (written and spoken).

What we offer

• The Mission Setup: A highly competitive freelance rate for the initial 2-month contract.
• The Path to Founding Engineer: If we're a great match, you'll transition to a full-time role with Founding team equity — build and own a piece of what you create.
• Impact: A defining role in building a system that could change how games are created worldwide.
• Extreme Ownership: You don't just test — you ensure the system works.
• Talent & Culture: Work with A-players in an AI-native team that ships fast, breaks things, fixes them, and keeps going.