Sr. Software Engineer, Agents

Plug is building agents to automate operational workflows across its used electric vehicle marketplace. The Senior Software Engineer, Agents will develop, evaluate, integrate, and monitor reliable agents and multi-agent workflows, while helping the engineering team adopt reusable patterns.

Responsibilities:

• Build and ship agents and multi-agent workflows for operations, dealers, and sellers: document extraction, inspection and title review, dealer and seller communication, and internal tooling
• Use LangChain and LangGraph to build agents, and LangSmith or Langfuse to trace, debug, and evaluate them
• Write evals, build datasets from real cases, measure accuracy and failure modes, and make regressions visible
• Integrate agents with the services the team already owns, through clean APIs and tools. Work within the existing architecture and raise design concerns with the owning engineer instead of routing around them
• Monitor agents in production: cost, latency, error rates, and human-review rates. Fix what breaks and tighten prompts, tools, and guardrails over time
• Ship full-stack when the job calls for it: the TypeScript and React screens where people review and correct agent output, and the backend endpoints behind them
• Help the rest of engineering adopt the same patterns. Build reusable tools, examples, and short write-ups that make the next agent faster to build