Senior Full Stack Engineer - Agent Runtime & Platform

Sydney

- Full time
- On-site/hybrid

Every agent task runs somewhere: a sandboxed container with a filesystem, a browser, tools and a time limit. This role owns that runtime and the platform services around it — the layer everything else in the product depends on.

What you'll do

- Own the agent sandbox runtime: provisioning, isolation, scheduling, lifecycle and cost per task at scale.

- Build and own platform services — identity plumbing, secrets, metering, object storage, workflow orchestration, and the tool/connector abstraction layer.

- Drive the observability stack from instrumentation through ingestion to the dashboard people actually open during an incident.

- Harden infrastructure against the failure modes that surface to users as “the agent got stuck”, and keep the platform from becoming a bottleneck to growth.





What we're looking for

- 5+ years building and operating production backend systems and platforms.

- Deep AWS (we are CDK-first) and container orchestration understanding below the level of configuration — schedulers, runtimes and isolation boundaries.

- Python strength, plus enough front end to build the internal tooling your platform needs rather than waiting for someone else.

- A bias for simplicity and pragmatism over architecture for its own sake.

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📌 Senior Full Stack Engineer - Agent Runtime & Platform (City of Sydney)
🏢 NinjaTech AI
📍 City of Sydney