Senior Software Engineer (Agents)

You’ll be a senior engineer on the core agent layer, the system that takes an engineer’s intent and executes multi-step workflows across complex desktop engineering software. This is the hardest and most important problem at the company.

You’ll report directly to the CTO and work as a senior individual contributor alongside AI engineers, a user researcher, and domain expert contractors. You don’t need to have built LLM agents before. What matters is a strong foundation in computer science and real curiosity about agents. You’ll be measured on agent task success rate, token efficiency, and workflow coverage.

What You’ll Own

• Build the core of the agent: tool-calling, state management across long multi-step workflows, error recovery, context management, and model routing
• Profile and optimize latency, track cost per completed workflow, and enforce per-task token budgets so the agent is commercially viable
• Write production code that drives desktop CAD/CAE/PLM applications on locked-down enterprise workstations, where robustness, concurrency, and failure handling matter
• Build evaluation infrastructure with benchmarks grounded in real user stories: reproducible, adversarial, and tied to customer value
• Work with the user researcher and domain experts to turn validated user stories into eval cases, and expand the share of workflow steps the agent handles end to end
• Raise the engineering bar through code review and sound design, and work with integration, product, and customers during POCs

Required Qualifications

• Extremely strong software engineering fundamentals
• 3-10 years of experience as a software engineer, shipping and maintaining production systems
• Depth in Python plus one other language
• Able to work on-site in San Francisco 5 days a week

Preferred Qualifications

• 5+ years of experience
• Experience at hyper-growth startups
• Familiarity with enterprise deployment constraints: how software behaves on a locked-down corporate workstation
• Degree from a top 20 CS program
• Experience with desktop automation, COM, or controlling applications programmatically
• Experience building agents and agentic AI systems