Senior Product Engineer

Quanta•San Francisco, CA

9d•Onsite

About The Position

Quanta is an AI-powered accounting and finance platform that fixes a major frustration for businesses: stale and slow financial data. We can do in seconds what takes our competitors weeks, which is why we’re trusted by many of today’s fastest growing startups. By rebuilding accounting from the ground up, we enable business decisions to be made with timely, complete, and explainable financial information. Many of today’s fastest-growing startups, including Decagon, Braintrust, Browserbase, and Mintlify, rely on Quanta as their financial foundation. The Team We are a tight-knit team of 17, working fully in-person in downtown San Francisco. Our backgrounds sit at the intersection of finance and engineering. As a group, we have built accounting systems at Affirm, ledgers at Stripe and Robinhood, and companies from the ground up. We have passed CPA exams, built finance teams from one to dozens, shipped 0→1 products, and scaled systems that support billions in transactions. We understand our customers because we have been in their shoes. We care deeply about correctness, trust, and building systems that last. We are opinionated about the future of finance and committed to building it together. We are defining the Operational Ledger, a new financial foundation for how businesses truly understand themselves. If you want to work on deep, consequential systems, financial data is one of the hardest places to do it well. Accounting sits at the center of every business, yet today it is slow, opaque, and stripped of the context needed to answer real questions. We use accounting as the raw material, not the end goal. By operating directly on real customer data and real workflows, we turn messy, judgment-heavy financial data into a reliable, queryable system of record.

Requirements

6–7+ years of full-stack engineering experience , ideally on small, high-impact B2B teams
Strong technical fundamentals across modern backend and frontend systems
Systems thinking , including API design, data modeling, and reliability
Product mindset with good judgment around tradeoffs
Comfort with ambiguity , ownership, and self-direction
Strong collaboration skills

Nice To Haves

Experience with financial systems, ledgers, or accounting workflows.
Excited about working in person with a collaborative team in San Francisco.

Responsibilities

Build and evolve the core infrastructure that runs Quanta’s accounting and finance platform in production, including ledgers, reconciliation pipelines, and automation workflows.
Design systems that can be reasoned about end to end and that remain stable as customers, workflows, and scale increase.
Work closely with accountants and the engineers leading our operational data model to apply, stress-test, and evolve these abstractions in real use.
Take responsibility for problems from first signal to shipped solution.
Design modular systems that make customization possible without sacrificing stability.
Work alongside other engineers to explore how new tools, workflows, and agentic systems can change how we design, implement, and maintain our product.
Ship quickly without cutting corners.