- Salary: up to $250k + super + bonus
- Location: Remote

A growing AI company whose product uses AI agents to complete real work for customers end to end. Small senior team based across Sydney and Melbourne, working directly with the founder.
The chance
They are hiring a Senior AI Engineer to own the engineering around the model: the runtime, tooling and reliability work that makes agents dependable in production. You will work directly with the founder and own much of the architecture.
What you will work on

- Agent runtime design: orchestration, checkpointing, cancellation, concurrency and handling provider failures
- Context engineering and persistent memory: history compaction, prompt-cache efficiency, memory scoped per user
- Typed tools and MCP integrations, keeping model intent separate from deterministic validation and execution
- Reliable transactions: idempotency, reconciliation and approval flows
- Sub-agent delegation and longer-running workflows
- Evaluation and observability:



replay suites, tracing, and per-task success, latency and cost

The stack
Python 3.12, FastAPI, Pydantic, SQLAlchemy, PostgreSQL and Redis. LangGraph, LangChain and MCP. TypeScript, React and Next.js. LangSmith, Sentry and PostHog.
You will have

- Hands-on experience shipping AI agents in real-time production for real users - the key requirement
- Strong production Python: asyncio, typed interfaces and debugging concurrent systems
- Solid backend depth: Postgres, transactions, migrations, caching and distributed-system failure modes
- Experience evaluating probabilistic systems and using traces to diagnose failures
- Security fundamentals: tenant isolation, least-privilege tool access and sensitive data handling

Apply with your CV for a confidential chat with Jordan Burns, Sustain Recruit.

📌 Senior AI Engineer - Agent Infrastructure (Sydney)
🏢 Sustainrecruit
📍 Sydney