Senior Software Engineer – Card Platforms & Payments

Mercury; United States; Remote; USD 167,000 - 208,000; Full time

Job summary

Mercury is seeking a Senior Software Engineer to own architecture and delivery for our Cards Integration team in a fast-paced fintech environment. You will lead end-to-end initiatives, learn the inner workings of debit/credit processing, and implement features across the stack.

You will collaborate with product, design, and operations while mentoring peers and ensuring high reliability and observability in mission-critical systems. Strong maturity in fintech is a plus.

Qualifications

• Have strong full-stack experience, a product mindset, systems thinking, and a knack for getting things across the line.
• Have made architectural decisions on complex systems, and be able to explain your reasoning and the trade-offs.
• Be excited to put new features in customers' hands, and care just as much about keeping existing ones working like a charm.
• Care about correctness in systems where failure has real financial consequences.
• Communicate clearly, handle ambiguity well, and enjoy mentoring others.
• Be comfortable with our tech stack (Haskell and TypeScript) or be ready to learn.
• Bonus: experience in fintech, payments, or card issuing.

Responsibilities

• Lead projects from idea to tech spec to implementation to launch, working with your PM, EM, tech lead, and teammates at each stage.
• Learn how debit and credit cards actually work under the hood (authorization, clearing, settlement, disputes) and use that knowledge every day.
• Build features across the stack, from the card experiences customers use to the backend systems that move money.
• Help keep our operations excellent. Our systems are some of the most observable at Mercury, and with great observability comes great responsibility.
• Mentor other engineers and raise engineering quality through design reviews, code reviews, and collaboration.
• Work with product, design, operations, risk, compliance, sales, and many other teams.

Skills

Full-stack experience

System architecture

Mentoring

Haskell

TypeScript

Fintech payments

Job description

Mercury is seeking a Senior Software Engineer to own architecture and delivery for our Cards Integration team in a fast-paced fintech environment. You will lead end-to-end initiatives, learn the inner workings of debit/credit processing, and implement features across the stack.

You will collaborate with product, design, and operations while mentoring peers and ensuring high reliability and observability in mission-critical systems. Strong maturity in fintech is a plus.