Senior/Staff Software Engineer, Product

Slash

San Francisco (CA)

On-site

USD 400,000 - 700,000

Full time

14 days+

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Benefits offered by this job

High autonomy + ownership culture

Comprehensive health + benefits plan

Unlimited PTO

Job summary

Slash, a leading fintech in San Francisco, is seeking a Senior/Staff Software Engineer to develop their core banking product, handling over $10B in transactions. This role demands ownership from database schema to user-facing product features. Candidates should possess full-stack capabilities, strong product instincts, and the ability to work independently in a fast-paced environment. Slash offers a high autonomy culture, comprehensive benefits, and opportunities for significant growth. The compensation range is $400K - $700K.

Qualifications

Experience shipping full product surfaces from data model to deployment.
Strong background in full-stack engineering with API and frontend skills.
Excellent product instincts, emphasizing UX and system correctness.

Responsibilities

Own and ship entire product surfaces end-to-end.
Build and scale core financial infrastructure.
Design data models and backend services for complex operations.
Collaborate with product, design, and compliance on features.
Contribute to architecture decisions and engineering standards.

Skills

Full-stack engineering

API design

Database migrations

Frontend development

Clean code and testing

Financial systems intuition

Job description

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 span 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