Senior Software Engineer - Mercury Command

Any Office or RemoteFull-timeCA$201k–CA$251k2026-07-11 → 2026-11-12

Core

Building and evolving Command, Mercury's LLM-powered financial assistant, to enable users to understand finances and take actions like sending payments and managing invoices via natural language.

Role type

Senior Software Engineer (LLM/Agentic Systems)

Builds

LLM-powered financial assistant features and agentic workflows for banking customers

Domain

Fintech / Large Language Models / Agentic AI

Deliverable

production ML models

Required skills

LLM application scaling, agentic system design, eval infrastructure, TypeScript, Haskell, full-stack AI product development, mentoring

Preferred skills

Experience with reliability/performance in production LLM systems, opinionated approach to trustworthy AI, cross-functional leadership

Technologies

TypeScript, Haskell, LLMs

Responsibilities

Design and ship new Command skills and agentic workflows; maintain and evolve prompt architecture and policy layers; tune model behavior and streaming patterns; build and expand evaluation harnesses; own reliability and quality from design to post-launch monitoring

Seniority

Senior, hands-on IC with mentorship

About Mercury

Mercury is on a mission to defy those expectations. We're a financial technology company that helps startups spend less time banking* and more time building. We believe that the key to our success revolves around thoughtful design — and we hold the craft of that design to an exceptionally high standard. We're looking for a Staff Brand Designer who sets that bar: someone whose eye is so precise, and whose execution is so considered, that the work around them gets better just by virtue of their presence.