Job Description

About the project

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

• 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

• 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.

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