Software Engineer - Mercury Command

Royper Royco LLC; United States; Remote; USD 122,000 - 176,000; Full time

Job summary

Mercury is seeking a backend/full-stack engineer to evolve Command, a large language model-powered financial assistant. You will ship new capabilities, learn Haskell, React, TypeScript, and Redux, and join a small, experienced team shaping Mercury’s future.

You will partner with product and compliance to define what success looks like for each capability, build tests, and apply AI tools to accelerate development and improve quality.

Qualifications

• Has 1-4 years of backend or full-stack development experience.
• Knowledge or interest in learning Haskell, React, TypeScript, and Redux.
• Experience building LLM powered products.
• A builder who is product-minded and has shipped new products.
• Empathizes with users and can translate their perspective into lovable products.
• Able to balance tradeoffs and find creative solutions.
• Active in incorporating AI tools to accelerate development and quality.

Responsibilities

• Ship new capabilities users love.
• Design and ship new Command skills with ownership.
• Partner with product and compliance to define success and build tests.
• Join a small team of experienced engineers building Mercury's future.

Skills

Backend development

Full-stack development

LLM-powered products

Product-minded

User empathy

Trade-off analysis

AI tools

Haskell

React

TypeScript

Redux

Tools

Git

Job description

Application facts

• Application form: from 12 forms we checked, 12 ask for a cover letter; about 3 questions only Mercury asks per form. What it asks
• Pay benchmark: Software Engineer postings that list pay show a $175K median (22,764 postings)
• Pay benchmark: Mercury postings that list pay show a $198K median (88 postings)

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 authentication of the right user. James Goodfellow, working at Smiths Industries, uncovered the insight 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
• Feel a strong sense of product ownership and actively seek responsibility – help design and ship new Command skills
• Partner with product and compliance teams to define what "working correctly" means for each new capability, then build the tests that prove it
• Join a small but mighty team of experienced product and AI engineers building the future of Mercury

This list is illustrative. Command is a product in motion and priorities will shift as we learn. The right person should be comfortable working in ambiguity, in a scrappy startup environment

The Ideal Candidate:

• Has 1-4 years of backend or full-stack development experience, with knowledge of or excitement to learn Haskell, React, TypeScript, and Redux
• Experience building LLM powered products
• A builder who is passionately product-minded and has experience building and shipping new products
• Empathizes with users and can channel their perspective to build lovable products
• Can balance tradeoffs and find creative solutions to accomplish goals
• Actively incorporates AI tools into their workflow and is excited about leveraging them to amplify their impact — whether that's accelerating development, improving code quality, or finding creative solutions to hard problems

If this role interests you, we invite you to explore our public demo at demo.mercury.com.

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

• 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.
• US employees (any location): $122,400 - $176,000 USD
• Canadian employees (any location): $115,700 - $166,399 CAD

What the Mercury application asks

From 12 application forms we checked.

• Location (City) asked on 12 of 12 forms
• Upload anything asked on 12 of 12 forms
• From where do you intend to work? asked on 11 of 12 forms
• Contact details: 12 of 12 forms
• Resume or CV: 12 of 12 forms
• Cover letter: 12 of 12 forms
• Visa sponsorship: 12 of 12 forms

Weekly email for Mercury jobs

We'll email you once a week with how many new Mercury jobs are open. Choose a plan and Applystead applies for you.

Applystead is not the employer. This description is shown as Mercury published it on its careers site, read on October 24, 2026 . Employers can ask [e-mail] to remove a posting.