Mercury
Senior Software Engineer - Mercury Command
$201K–$251K
San Francisco, CA, New York, NY, Portland, OR, or Remote within Canada or United States +1 · Remote · Senior · Full-time · Posted Feb 13, 2026
- Location
- San Francisco, CA, New York, NY, Portland, OR, or Remote within Canada or United States
Any Office or Remote - Experience
- 7 or more years of software engineering experience.
About the job
Build and evolve Mercury Command, an LLM-powered financial assistant, including its capabilities, agentic workflows, LLM infrastructure, and quality systems.
What you'll do
- Design and ship Command skills, agentic workflows, tool schemas, and end-to-end user capabilities.
- Maintain and tune the prompt architecture, model behavior, and LLM reliability and performance.
- Build evaluation infrastructure and tests, and own quality from design through post-launch monitoring.
What they ask for
- 7 or more years of software engineering experience, with deep expertise building and scaling LLM-powered applications in production.
- Experience scaling a production LLM product and designing reliable, explainable, and safe agentic systems.
- Experience building evaluation infrastructure and measuring product performance.
- Comfort with TypeScript and willingness to learn Haskell for backend tool work, or comfort with both.
Nice to have
- Track record of mentoring engineers and raising the technical bar of a team.
Pay
$200,700 — $250,900 USD (base salary); $189,700 — $237,100 CAD (base salary)
Tools
TypeScript, Haskell
AI focus
Build and scale an LLM-powered financial assistant, including agentic workflows, prompt architecture, model tuning, and evaluation systems.
Model-written summary · the original posting is authoritative