Senior Product Engineer

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Location: San Francisco, CA
Company size: 10–50
Posted: 2mo ago
Via: Yc

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Job listing · Updated 21 AUG 2026

Senior Product Engineer

Sphere· San Francisco, CA, USView company profile

Job title: Senior Product Engineer
Job location: San Francisco, CA, US
Job listing URL: https://www.ycombinator.com/companies/sphere/jobs/bbaPgMs-senior-product-engineer
Job description: **Mission** Sphere has built the world’s first AI-native tax engine that helps companies like Eleven Labs, Replit, Runway AI, Windsurf (+ many more) automate their sales tax, VAT and GST obligations: * We're growing rapidly (34%+ MoM revenue growth) and helping the fastest growing tech companies around the world including Eleven Labs, Replit, Windsurf, Fathom, Linktree, Photoroom, Sierra AI, Zed etc * We’ve spent the last 1.5 years building local rails into tax authorities in both the US and internationally to properly automate compliance processes (no other vendor has done this) * We're building the world's first AI-native tax engine (which will be the foundation for a broader cross border compliance platform; think Deel for international billing) * We're well funded by Felicis Ventures and YC Sphere is looking for a passionate product engineer to help build out new features / products on our roadmap and take our customer experience to the next level. They’ll be working directly with customers, our design and eng team as well as our CEO / Founder to bring Sphere’s product vision of becoming the world’s first cross-border compliance engine to life **Why this is a massive opportunity:** 🌍 Massive TAM: Every business around the world needs this. Compliance isn’t optional. 🌬️ Strong macro tailwinds: Businesses are expanding globally at a faster pace, while tax authorities are cracking down on cross-border compliance, driving urgent demand. ✨ AI advantage: Incumbents can’t scale beyond the U.S.; our AI-native tax engine can. 🔮 Product vision: Indirect tax is just the start; we’re building the Deel for international billing. **What you will do:** _Within weeks:_ * Work / listen to many of our customers on what their main pain points are and prioritize lowest hanging fruit features that can help solve their problems * Collaborate extensively with design on bringing those features to life * Executing and shipping features, end-to-end, on a daily basis * Doing customer support where necessary to understand our customers and how they think as much as possible _Within months:_ * Own our feature / product roadmap in conjunction with the CEO / Founder (you will work a lot together) * Build / implement more rigorous customer feedback / analysis processes to allow us to better prioritize roadmap **What’s important to us:** * The Dog: Grit > pedigree. * Ship fast: If it can be done today, do it today. * Self-starter: No hand-holding * Accountability: You’ll be held accountable to objective, measurable targets each month. * In-person: SF only. **Requirements:** * Strong experience with React. Our entire front end is built in react. * Strong experience with Figma. In order to collaborate efficiently with design. * Customer obsession. You’re going to be talking to a lot of people in the finance realm (Controller, Heads of Finance, Heads of Tax). You need to like them and obsess over them. * Very strong attention to detail. When you work with numbers this is a non-negotiable - it’s not enough to be 99% right. * Strong organization skills. We get hundreds of feature requests every day. How you monitor, organize and prioritize these is key. _Nice to have:_ * Experience working with large volumes of transaction data. You’ll be getting very familiar with it! * Experience in Python and Django. Our core application backend and data pipeline services are built with Python and Django * Experience using tools like PostHog and Sentry

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