Staff Platform Engineer

Quanta•San Francisco, CA

1d•Onsite

About The Position

We're building a new system of record for finance, one that understands not just the numbers, but the business context behind them. At its core is our Operational Ledger: a financial data layer that preserves every event, calculation, policy, source, and decision behind the financials, rather than reducing them to contextless entries. Questions that once took weeks to answer become as routine as a Google search: Why did margins change? Which customers are actually profitable? How are we tracking against budget? We're not bolting AI onto legacy software. Quanta was built from the ground up around granular financial data, flexible primitives, and systems that agents can safely understand and act on. We've spent years closing the books for real, fast-growing companies and turning what we learn into product. We've already replaced much of what QuickBooks and NetSuite can do and the manual work surrounding them. Customers are now turning off legacy accounting systems and moving to Quanta. We're still early. The problems are hard, the ambition is enormous, and there's no playbook for what we're building. As a Staff Engineer on the Platform team, you'll work on the foundational systems that Quanta's product and engineering teams build on top of. You'll own problems where architecture, correctness, reliability, and developer leverage matter—and where the right abstraction can unlock an entire category of product capabilities. You'll operate across team boundaries, identifying the technical investments that matter most and driving them from ambiguous problem to production.

Requirements

10+ years of software engineering experience, with significant experience building and owning complex backend, platform, or distributed systems in production.
Deep backend and distributed systems experience, particularly with systems where correctness, reliability, and data integrity matter.
Strong systems thinking, including API design, data modeling, system boundaries, failure modes, and operational tradeoffs.
Excellent technical judgment and the ability to distinguish between problems that require durable infrastructure and those where the simplest solution is the right one.
Strong debugging instincts and comfort working through difficult problems across application, data, and infrastructure layers.
Ability to create clarity from ambiguity and independently identify the highest-leverage technical problems to solve.
Strong communication and collaboration skills, particularly when translating complex technical tradeoffs for engineers and non-engineers.
A hands-on mindset. You want to design systems and build them.

Nice To Haves

Experience with financial systems, ledgers, accounting infrastructure, data platforms, developer platforms, or other systems where correctness and auditability are critical.
Excited about working in person with a collaborative team in San Francisco.

Responsibilities

Work on the foundational systems that Quanta's product and engineering teams build on top of.
Own problems where architecture, correctness, reliability, and developer leverage matter.
Operate across team boundaries, identifying the technical investments that matter most and driving them from ambiguous problem to production.
Design systems and build them.