About The Project (description, Duration, Stage) Hands-on Tech Lead for an AI Companion in an online mahjong game.

The client is a social gaming company (web3 element) that scales its product and team.

We deliver the AI side of their game as their embedded AI partner.

The AI Companion plays mahjong at a strong level and explains its moves.

The core of the role is to build the mahjong-playing algorithm: a dedicated decision-making model (RL, imitation learning, or search-based — trained on the client's hand-history data) with an LLM reasoning layer on top.

Key design constraints: a valid-action contract with the game engine (the bridge supplies legal moves), win detection, and a 2-second response budget per move.

Explanations run async.

Support for more than one rule set (riichi and regional variants) is on the roadmap.

Duration: 3 months, 0.5 FTE.

What You’ll Actually Do (example Tasks) Design and build the mahjong-playing algorithm: choose and defend the approach (imitation learning on hand histories, RL / self-play, search with MCTS, or a hybrid), then train, evaluate, and ship it.





Own the technical architecture end to end: game model + LLM reasoning layer, valid-action mask, win detection, and the API contract with the client's game bridge.

Hit the 2-second response budget: design and measure the inference path, batching, and caching; keep a latency buffer for the client-facing number.

Define what data and event names we need from the client (hand histories, event streams); build the training and calibration pipeline on that data.

Build and run the evaluation harness: measure play strength against the client's reference points, and validate explanation quality.

Stand up LLM observability with Langfuse (async logging, N+1 batch) as an early sprint quick win.

Take over context from the team and lead the sprint work with the AI Engineer; work with the client's Product Owner in a scrum process.

Front the client's CTO and engineers on technical decisions; explain trade-offs in plain language and in depth when asked.

Watch the risks the

📌 Ai architect / tech lead (mahjong game) (España)
🏢 Neurons Lab
📍 España