Senior/Staff Software Engineer, Product

About Slash

Slash is building the future of business banking, one industry at a time. We believe businesses deserve financial infrastructure tailored to how they actually operate. That's why we're creating a new category of business banking. We combine the reliability of traditional banking (high yields, competitive rewards, and comprehensive security) with industry-specific features that make businesses more efficient, more competitive, and more profitable.

Started in 2021, Slash is one of the fastest growing fintechs in the world and we power over ten billion dollars a year in business purchasing across numerous industries. We recently raised a $100M Series C led by Ribbit Capital with participation from Khosla Ventures, Goodwater Capital, NEA, and Y Combinator, accelerating our expansion into new markets and products.

Slash is headquartered in San Francisco, and has a strong in-person culture.

About the role

Slash is, at its core, a technology company and is on a mission to build the best engineering team in the world. We’re looking for a Senior/Staff Software Engineer to help build and evolve our core banking product that powers $10b in transaction volume a year. This role blends infrastructure-level thinking with deep product intuition. You’ll build fault-tolerant, user-facing financial primitives that spans across all customers, and you’ll do it fast, cleanly, and with ownership.

What you’ll do

• Own and ship entire product surfaces end-to-end, from database schema and API design to building the product customers interact with daily

• Build and scale our core financial infrastructure: payments, transfers, invoicing, bill pay, onboarding, and card management systems that move tens of billions of dollars a year

• Design data models, write migrations, and build the backend services that power complex multi-step financial operations

• Work directly with product, design, and compliance to ship features that are correct, compliant, and actually good to use — in financial software, the details are the product

• Shape engineering standards, contribute to architecture decisions, and talk to customers to figure out what to build next

We're Looking for Someone Who

• Has shipped and owned full product surfaces — not just isolated features, but entire systems from data model to deploy

• Is a strong full-stack engineer: comfortable designing API endpoints, writing a database migration, and building the frontend for a project end to end

• Has strong product instincts — thinks holistically about UX, API ergonomics, and system correctness, and pushes back when something doesn't feel right

• Thrives working independently in a small team that ships fast — you're the kind of person who builds product without requiring a full spec

• Cares about craft: writes clean, well-tested code, thinks about edge cases, and takes pride in building software that is delightful to use

• Bonus: Has an intuition for financial systems (payments, ledgers, compliance) or a genuine desire to go deep on them

What's in it for You:

• Opportunity for high growth

• High autonomy + ownership culture

• Comprehensive health + benefits plan

• Working out of our downtown San Francisco office space

• Unlimited PTO