Sydney
2 weeks ago
Agent Harness Engineer - Core Runtime
NinjaTech AI
Sydney
2 weeks ago
Agent Harness Engineer - Core Runtime
NinjaTech AI is seeking a Core Runtime engineer to own the agent harness that powers autonomous AI agents. The role involves designing the run loop, orchestrator, and monitoring layer, and requires 4+ years of Python backend experience and familiarity with LLM APIs.
Core AIRemoteFull-timeMid LevelPythonConcurrency
Agent Harness Engineer - Core Runtime
NinjaTech AI is seeking a Core Runtime engineer to own the agent harness that powers autonomous AI agents. The role involves designing the run loop, orchestrator, and monitoring layer, and requires 4+ years of Python backend experience and familiarity with LLM APIs.
Core AIRemoteFull-timeMid LevelPython
Salary
Not specified
Core Qualifications
Technical (Must-have)
PythonConcurrencyProcess supervisionFault-tolerant designLLM APIsAgentic patternsTool callingFunction callingStreamingBackend systemsSystems software
Soft Skills
Engineering rigorScientific curiosityCollaboration
Preferred Qualifications
Technical (Nice-to-have)
SandboxingContainerizationSecure code execution
Key Responsibilities
- Design and evolve the agent run loop: context management, turn compaction, and recovery from failed or partial tool calls
- Build the orchestrator that launches, supervises, and hands off long-running background agents without losing state
- Implement the monitoring layer that detects stuck, looping, or runaway agents and intervenes safely
- Own the provider abstraction across model backends (Claude, Codex, and others) so the harness stays model-agnostic
- Make the harness observable end to end with structured telemetry, so failures are debuggable in production
- Keep the loop fast and cheap at scale while it powers millions of daily user interactions
- Research, design, and build the core run loop and orchestration that power autonomous agents
- Define how agents manage context, recover from errors, and hand off work cleanly
- Build rapid prototypes and proof of concepts to turn harness ideas into shipped product capabilities
- Stay up-to-date with agent architectures from research and industry, and fold the best ideas into our runtime
- Design self-healing mechanisms so agents degrade gracefully instead of failing hard
- Collaborate with cross-functional teams including applied science, product, and integrations
Agent HarnessCore RuntimePythonLLMAutonomous AgentsBackendSystems EngineeringRemoteFull-timeAI