Senior AI Agent Engineer @ Planera

Senior AI Agent Engineer @ Planera - Back to Planera’s Job Listings Senior AI Agent Engineer Location United States Employment Type Full time Location Type Remote Department Engineering About the Role Join Planera to build Manny, our AI scheduling assistant, and shape how construction schedulers work with AI on a modern Critical Path Method platform. You will own agent features end to end: designing and evolving the LangGraph/LangChain agent, engineering prompts and tools, integrating LLMs across providers, and holding response quality to a high bar with a real evaluation and observability stack. This is a hands-on applied AI role with a strong software engineering foundation and a focus on reliability, behavior quality, and user impact. You will work directly with the CTO and the lead AI engineer. Key Responsibilities Design, build, and own Manny features end to end across the agent backend, tools, and UI Improve agent behavior, reliability, and answer quality through prompt engineering, tool design, and changes to the agent control flow Evolve the agent architecture: ReAct loop, routing and controller logic, multi-node graphs, tool selection, and streaming responses Integrate and tune LLMs across providers (Anthropic, OpenAI, Google), balancing quality, latency, and cost, including prompt caching and model selection Design and extend Manny's tool surface through the MCP server that connects the agent to Planera's scheduling services Build and own the evaluation loop: golden datasets, automated evaluators, snapshot-based replay, and offline and online quality metrics Implement observability for agent runs with tracing, metrics, and structured logging, and use it to debug and improve behavior in production Ensure safe, sandboxed execution of model-generated code and safe handling of tool side effects and mutations Collaborate with product, backend, and frontend to deliver AI features end to end Requirements 4+ years of