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Senior Software Engineer - Mercury Command

MercurySan Francisco, CA, New York, NY, Portland, OR, or Remote within Canada or United StatesEngineering
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Salary
Not listed
Job type
Full-time
Work mode
Remote
Posted
13 Feb 2026
Status
Open · checked 7d ago

About this role

Mercury is seeking a Senior Software Engineer for the Command team to develop and scale LLM-powered financial assistant tools. This remote-friendly position is well-suited for an experienced technologist interested in shaping the future of AI-driven business banking interfaces.

Role Overview

The Senior Software Engineer - Mercury Command position involves building and expanding Command, an LLM-powered financial assistant that lets users handle workflows like cash flow analysis, invoice management, and payments using plain language. The selected candidate will lead the design of agentic workflows, shape data contracts between business logic and the model, and maintain the prompt architecture. Working across the full stack from system prompts to frontend components, this role directly influences how customers interact with financial tools.

Key Responsibilities

Design and ship new Command skills and domain-specific instruction sets for tasks like sending money and managing invoices.
Build agentic workflows and define the multi-step agent interaction architecture.
Collaborate with backend teams to establish tool schemas and data contracts between business logic and the model.
Own features end-to-end, spanning system prompts and frontend rendering components.
Maintain and evolve prompt architecture, including system prompts, skill loading systems, session context, and compliance layers.
Tune model behavior across reasoning effort, prompt caching, fallback chains, and streaming patterns.
Develop and expand the eval harness by writing test cases and scoring rubrics to prevent regressions.
Partner with product and compliance teams to define and test correct functionality.

Requirements

Seven or more years of professional software engineering experience.
Deep technical expertise in building and scaling production-grade LLM-powered applications.
Experience designing reliable, explainable, and safe agentic systems for multi-step workflows.
Track record of building evaluation infrastructure to measure actual product efficacy rather than simple output plausibility.
Deep understanding of deployment tradeoffs such as latency, cost, and compliance.
Comfort using TypeScript and a willingness to learn Haskell, or existing familiarity with both languages.
Ability to work across the full stack of an AI product from prompts to streaming frontends.
Experience mentoring other engineers and raising team technical standards.

Skills and Tools

TypeScript
LLM
Haskell (willingness to learn)
Agentic workflows
Evaluation harnesses and testing frameworks
Prompt architecture and tuning

Salary and Benefits

Mercury provides a total rewards package that includes a competitive base salary, equity through stock options or RSUs, and comprehensive benefits. Target new hire base salary ranges depend on geographic location and experience. For US employees across any location, the base salary ranges from $200,700 to $250,900 USD. For Canadian employees across any location, the base salary ranges from $189,700 to $237,100 CAD.

About the Company

Mercury builds technology that advances long-term financial interfaces, operating as a fintech company rather than an FDIC-insured bank. Banking services are provided through partner institutions including Choice Financial Group and Column N.A., Members FDIC. Mercury is an Equal Employment Opportunity employer that values workplace diversity, belonging, and provides reasonable accommodations for applicants with special needs.

How to Apply

Interested candidates should visit the official Mercury careers page to submit an application for this opportunity.

Skills and tech stack

TypeScriptLLM

Questions candidates ask

What is Mercury Command?

Command is Mercury's LLM-powered financial assistant that enables users to manage finances, understand cash flow, issue cards, send payments, and handle invoices using plain language.

What are the location options for this role?

The role can be based in San Francisco, CA, New York, NY, Portland, OR, or done remotely within Canada or the United States.

What programming languages are required?

Candidates must be comfortable with TypeScript and willing to learn Haskell for backend tool work, or already be comfortable with both languages.

What is the salary range for US employees?

The target new hire base salary range for US employees in any location is $200,700 to $250,900 USD.

What is the salary range for Canadian employees?

The target new hire base salary range for Canadian employees in any location is $189,700 to $237,100 CAD.

Ready to apply?

The application is on the official Mercury careers page.

Apply on company site