AI Architect / Tech Lead (mahjong game)

Job description

## 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 Vlad Borysenko (0.15–0.2 FTE supervision during ramp-up) 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 account team flagged: licensing on new training data, engine-bridge capabilities, and multi-rule-set scope. ## Skills *(hands-on first)* - **Game AI / sequential decision-making**: hands-on RL, imitation learning, or search-based agents (MCTS, self-play) — ideally for imperfect-information games (mahjong, poker, card games) - Expert **Python** for ML systems; strong software engineering (APIs, testing, CI) - **Model training on gameplay data** end to end: data → training → evaluation → serving - **LLM application engineering**: reasoning layers, prompt and context design, structured outputs, guardrails - **Low-latency inference**: profiling, batching, caching, model-size trade-offs against a hard time budget - LLM observability and evaluation (Langfuse or similar) - AWS deployment for ML workloads - Technical leadership of a small pod; clear written and spoken communication with client engineers and executives ## Knowledge - Game theory for imperfect-information games; evaluation of play strength (win rates, Elo-style ratings, baseline agents) - Game-engine integration patterns (event streams, action masks, state bridges) - Web3 / gaming product context — plus, not required - AWS Well-Architected for ML workloads ## Experience Key characteristics (ideally 4/4): - Hands-on ML/AI engineering at production scale - Shipped an AI system inside a live product with hard latency limits - Cloud hyperscaler experience (AWS preferred) - Technology consulting / client-facing delivery background Role-specific characteristics: - **6+ years** hands-on ML/AI engineering, with real **game AI or sequential decision-making** work (RL / MCTS / self-play — not only LLM apps) - Trained models on user or gameplay data end-to-end (data → training → evaluation → serving) - Led small delivery teams while still coding personally - Comfortable owning an architecture in front of a technical client CTO ## Questions for Applicants - **Imperfect information**: mahjong hides most tiles from each player. How does hidden information change your algorithm choice compared to a perfect-information game like chess? - **Latency budget**: tell us about a system you shipped with a hard response-time limit. How did you design, measure, and defend the budget? - **LLM + model hybrid**: how would you combine a trained game model with an LLM explanation layer so the explanation never contradicts the move? - **Hands-on + lead**: how do you balance personally coding the hard parts with leading an engineer and fronting the client?