---
title: 'Senior Software Engineer - Mercury Command at Mercury'
canonical: 'https://feeny.ai/job/senior-software-engineer-mercury-command-mercury-san-francisco-ca-new-york-ny-qh9fax6pc9gq'
type: 'job'
last_seen: '2026-09-13'
---

# Senior Software Engineer - Mercury Command at Mercury

- **Company:** Mercury
- **Location:** San Francisco CA New York NY Portland OR OR Within Canada OR, United States
- **Compensation:** $190k–$251k
- **Work type:** remote
- **Posted:** 2026-02-13
- **Last confirmed live:** 2026-09-13
- **Apply:** https://job-boards.greenhouse.io/mercury/jobs/5803347004

## Job description

In 1965, an engineer in Scotland was given a mundane task with a tricky problem to it - banks wanted to close on Saturdays and still serve customers, but they didn’t know how to solve the authentication of the right user. James Goodfellow, working at Smiths Industries, uncovered the insights that you needed something you have (a card) and something you know (a PIN). Because someone told him they could only remember 4 digits instead of his proposed 6, today over 3 million ATMs use a card+4 digit PIN over 60 years later.

Like the ATM, Mercury is building technology that pushes forward financial interfaces for the long term. Command is Mercury's LLM-powered financial assistant, launched to all customers in June 2026. It lets users understand their finances and take action in plain language, from asking about cash flow to sending payments, issuing cards, and managing invoices. With the product now in customers' hands, the work is to evolve it, extend its capabilities, and find new ways to leverage LLMs to give Mercury customers a more powerful banking* experience.

## What you'll do

Ship new capabilities users love:

- Design and ship new Command skills, the domain-specific instruction sets that teach the model how to handle workflows like sending money, managing invoices, and understanding cash flow
- Design and build agentic workflows in Command, defining the architecture for how multi-step agent interactions should work as we extend what the product can do on a customer's behalf
- Work with backend teams to define tool schemas for new capabilities, shaping the data contracts between Mercury's business logic and the model
- Own new capabilities end to end, from the system prompt to the frontend component that renders the response

Own the LLM layer:

- Maintain and evolve Command's prompt architecture: the system prompt, skill loading system, session context, and the policy and compliance layers underneath
- Tune model behavior: reasoning effort, prompt caching strategy, fallback chains, and the streaming patterns that make the product feel fast
- Stay current with how models are evolving and bring that knowledge back to how Command is built

Build quality in:

- Write and expand Command's eval harness, adding cases that cover new capabilities and scoring rubrics that detect regressions before users do
- Partner with product and compliance teams to define what "working correctly" means for each new capability, then build the tests that prove it
- Own the reliability and quality of what you ship, from initial design through post-launch monitoring

This list is illustrative. Command is a product in motion and priorities will shift as we learn. The right person will help choose the next highest-leverage work.

The ideal candidate

- Has 7 or more years of software engineering experience, with deep technical expertise building and scaling LLM-powered applications in production
- Has gone beyond shipping a first version: you have scaled an LLM-powered product, dealt with the reliability and performance problems that come with real usage, and made it better over time
- Has experience designing agentic systems and has opinions about how to architect multi-step workflows that are reliable, explainable, and safe to run on behalf of real users
- Has built eval infrastructure and can write cases that actually measure whether the product works, not just whether the model outputs something plausible
- Understands the real tradeoffs in LLM deployments: latency, cost, compliance, and what breaks in production that doesn't show up in demos
- Has opinions about what makes an AI product trustworthy, not just impressive, and can build toward that bar
- Is comfortable with TypeScript and willing to learn Haskell for backend tool work, or already comfortable with both
- Can work across the full stack of an AI product, from the system prompt to the streaming frontend
- Has a track record of mentoring engineers and raising the technical bar of their team

If this role interests you, we invite you to explore our public demo at [demo.mercury.com](http://demo.mercury.com).

*Mercury is a fintech company, not an FDIC-insured bank. Banking services provided through Choice Financial Group and Column N.A., Members FDIC.

Mercury values diversity & belonging and is proud to be an Equal Employment Opportunity employer. All individuals seeking employment at Mercury are considered without regard to race, color, religion, national origin, age, sex, marital status, ancestry, physical or mental disability, veteran status, gender identity, sexual orientation, or any other legally protected characteristic. We are committed to providing reasonable accommodations throughout the recruitment process for applicants with disabilities or special needs. If you need assistance, or an accommodation, please let your recruiter know once you are contacted about a role.

## #LI-RA1

Total Rewards The total rewards package at Mercury includes base salary, equity (stock options/RSUs), and benefits.

Our salary and equity ranges are highly competitive within the SaaS and fintech industry and are updated regularly using the most reliable compensation survey data for our industry. New hire offers are made based on a candidate’s experience, expertise, geographic location, and internal pay equity relative to peers.

Our target new hire base salary ranges for this role are the following:

US employees (any location): $200,700—$250,900 USD

Canadian employees (any location): $189,700—$237,100 CAD

## About Mercury

## Company Overview
- **One-liner**: Mercury provides banking and financial workflow solutions for startups and ambitious companies.
- **Entity Type**: Private (venture-backed)
- **Headquarters**: San Francisco, California, USA (offices also in New York, NY and Portland, OR)
- **Founded**: Not publicly available
- **Founders**: Not publicly available

## Core Business
- **Primary industry/industries**: Fintech, Business Banking, Financial Operations
- **Target customers**: B2B – primarily startups and growing companies
- **Mission or purpose statement**: “Transformative banking for ambitious entrepreneurs” – making banking better and simplifying financial operations so businesses can focus on growth.

## Products & Services
- **Mercury Banking**: A powerful business bank account (checking, savings, debit and credit cards) that serves as the nucleus of financial operations. (Service)
- **Bill Pay & Spend Management**: Tools to pay bills, send invoices, monitor spending, and understand cash flow – all from one platform. (SaaS/Service)
- **Financial Operations Platform**: Integrates payments, invoices, bill pay, cash flow monitoring, and spend management into a single dashboard. (SaaS)

## Market Standing
- **Valuation/Market Cap**: Not publicly available
- **Key Metric**: Over 200,000 startups use Mercury; employees count exceeded 1,000 (950+ as of one source, 919 U.S.-based employees reported by Great Place to Work).
- **Notable Investors/Partners**: Backed by top-tier venture capitalists (specific names not disclosed in available sources). Banking services provided through Choice Financial Group, Column N.A., and Evolve Bank & Trust (Members FDIC).
- **Growth Signals**: 
  - Within days of Silicon Valley Bank’s failure (March 2023), Mercury picked up more than $2 billion in deposits and retained 92% of those customers six months later.
  - Recognized on Fortune’s Best Medium Workplaces 2023 (ranked 16th), Forbes Fintech 50, and Fast Company’s Most Innovative.
  - 96% of employees say Mercury is a great place to work (Great Place to Work certified).

## Competitive Advantages
- **All-in-One Financial Hub**: Combines banking, payments, bill pay, and spend management in one platform, reducing the need for multiple tools.
- **Startup-First Design**: Built specifically for high-growth companies, with features that scale from early stage to established enterprise.
- **High Customer Retention**: Proven stickiness after the SVB crisis demonstrates strong trust and product-market fit.
- **Top-Tier Backing and Recognition**: Endorsed by leading investors and media, reinforcing credibility.

## Strategic Focus
- **Product Expansion**: Continuing to build out financial workflows (bill pay, spend management) to become the single source of truth for business finance.
- **AI Integration**: Hiring for roles like Senior Machine Learning Operations Engineer, AI Engineering, and Model Risk Manager – indicating a push to embed AI/ML into products and internal processes.
- **Remote-First Talent**: Embracing a remote-first culture with physical offices in SF, NY, Portland, and hiring across the US and Canada.

## Why Work Here
- **Culture & Values**: Emphasizes “build relentlessly,” “think actively,” “be super helpful,” and “act with humility.” Employees report a strong sense of purpose and collaboration.
- **Remote & Hybrid Flexibility**: Remote-first with optional in-office hubs. Open roles are listed as “Any office or remote” in the US and Canada.
- **Benefits Package**:
  - Health, dental, vision insurance
  - 12+ weeks paid parental leave
  - $600 custom work-from-home equipment setup
  - Annual $1,000 learning & development budget
  - Paid 6-week sabbatical after 5 years
  - Weekly $100 food budget
  - Monthly $100 wellness budget
  - Monthly $50 cellphone reimbursement
  - Unlimited vacation (with mandatory minimum)
  - 401(k) matching up to 4% of base salary
  - Inclusive fertility and family-forming benefits (Carrot Fertility)
  - Pet-friendly offices with free lunch, snacks, and beverages
- **Growth Opportunities**: 950+ employees (as of one source) and growing; strong commitment to career development and high-impact work.
- **Diversity & Inclusion**: Stated priority to embrace every individual and provide tools for great work.

## Sources
1. [mercury.com/jobs](https://mercury.com/jobs) – Benefits, culture, open roles
2. [mercury.com/about](https://mercury.com/about) – Company overview, values, press mentions, Forbes quote
3. [job-boards.greenhouse.io/mercury](https://job-boards.greenhouse.io/mercury) – Current job listings
4. [linkedin.com/company/mercuryhq/jobs](https://www.linkedin.com/company/mercuryhq/jobs) – LinkedIn jobs page
5. [greatplacetowork.com/certified-company/7025113](https://www.greatplacetowork.com/certified-company/7025113) – Employee satisfaction certification, headcount

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