AI Engineer San Francisco & Paris

Contract:

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

We are looking for an exceptional AI Engineer to join us for a high-impact, 2-month sprint. Your mission: build the robust, scalable brains behind our automated game creation workflow.

If this 2-month mission is a success, the goal is to convert this into a full-time Founding Engineer role.

• Architect and scale agentic loops:
  Design and implement robust multi-agent systems that generate entire games autonomously, from logic scripting to scene design.
• Design bridging architectures:
  Create and manage custom Domain-Specific Languages (DSLs) to reliably translate unstructured LLM reasoning into deterministic, playable 3D environments.
• Advanced Model Ops:
  Go beyond basic prompting. Handle complex context management, multi-turn memory systems, and fine-tuning of models (via Vertex AI) to improve accuracy, reduce latency, and control costs for game generation tasks.
• Master Foundation Models:
  Deeply integrate and orchestrate state-of-the-art models, primarily Claude (Anthropic) and Gemini (Google), optimizing tool use and planning abilities.
• Own the AI Cloud Infrastructure:
  Deploy, manage, and scale our AI applications using Google Cloud Platform (GCP), ensuring low latency and high reliability in production.
• Bridge AI and 3D:
  Work directly within interactive web environments, feeding AI outputs into real-time rendering engines.

• You have a proven track record of engineering production-ready applications powered by LLMs and agentic frameworks.
• You possess strong, hands‑on expertise in the GCP ecosystem (especially Vertex AI for fine‑tuning and model deployment).
• You are hands‑on with Web 3D:
  You either have solid experience with Three.js (WebGL/WebXR), OR you are a fearless learner totally willing to dive deep into 3D scene graphs, spatial reasoning, and game logic.
• You've shipped systems using frontier models (Claude, Gemini) and mastered advanced context window optimization, strict JSON enforcement, and function calling.
• Your personal workflow is heavily AI-augmented.
• You care deeply about speed of iteration — you are a hacker and a builder who thrives in a small team where everyone ships.
• Language:
  You are perfectly fluent in English (written and spoken).

• 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 reshaping how games are built and played by billions.
• Extreme Autonomy:
  You'll lead the architecture, not follow instructions.
• Talent & Culture:
  Work with A‑players in an AI‑native team that moves fast, celebrates hard, and obsesses over the mission.