Senior Full Stack Engineer

Compensation\n\n$240K – $280K • Offers Equity\n\n## ABOUT SPHERE\n\nEvery breakthrough in trade infrastructure has followed the same pattern: reduce a transaction cost, expand the market. Containerization for goods. SWIFT for money. Stripe for payments. Compliance is one of the last and largest — and the hardest, because trade rules aren't data to be looked up. They're a complex adaptive system with 190+ sovereign jurisdictions, in different languages, changing constantly, reacting to each other.\n\n## THE ROLE\n\nSphere is looking for senior full stack engineers who will own and build out new product lines (input tax, withholding tax, e-invoicing, tariffs) as well as mission critical parts of the Sphere platform (filing infrastructure, tax engine and AI / agentic related features).\n\n## WHAT YOU'LL DO\n\nWithin weeks:\n\n- Ship mission critical features that clients will use daily - e.g. filing infrastructure\n\n- Own and manage a feature and drive measurable outcomes\n\n- Work directly with customers like Eleven Labs, Lovable and Deel to improve / optimize that key component of the platform (e.g. improve filing generation and submission speed [x]%)\n\nWithin months:\n\n- Own the end-to-end development of new products lines that will help build out our AI-native revenue-based compliance platform\n\n- Lead / mentor additional engineers in component areas that you have worked in\n\n## REQUIREMENTS\n\n- Experience in Python . Our core application backend and data pipeline services are built with Python and Django\n\n- While frontend / React may not be your primary focus, you’re not afraid to dive in when needed\n\n- Very strong attention to detail. When you work with numbers this is a non-negotiable - it’s not enough to be 99% right.\n\n## NICE TO HAVES\n\n- Experience working with large volumes of transaction data. You’ll be getting very familiar with it!\n\n- Experience with Django or Python ORM\n\n## WHO YOU ARE\n\nYou'll thrive here if:\n\n- You're a Dog. You've been underestimated, gone through struggle, and never stopped running. You have a chip on your shoulder and enormous drive. You look at Stripe, Deel, and Flexport all punting on compliance and think: _good, that means the opportunity is ours._ Hunger beats pedigree.\n\n- Early stage is in your bones. You've built things where there's no playbook and nobody handing you the answer. You define the problem instead of waiting for instructions.\n\n- You own it end to end. Give you a goal and you figure out your own path. Small team, global surface area — everyone owns a domain that would be a full team at a larger company. No one tells you how.\n\n- You believe speed and accuracy are both possible. We're building a complex product that requires robustness and 100% uptime, and we have to build at our customers' pace. Move fast. Don't break things. Both.\n\n- Being in the room is a feature, not a cost. Five days in SF isn't a policy, it's how the work gets done. The speed and density of collaboration we need doesn't survive over video.\n\nThis won't be a fit if:\n\n- You need structure handed to you or ambiguity feels draining rather than motivating\n\n- You want to manage people more than own hard problems (we're a flat, experienced team — everyone builds)\n\n- You're used to "good enough" shipping (small errors have outsized impact here)\n\n- Being in the room five days a week feels like a cost instead of a benefit\n\n## Benefits\n\n- Compensation Range: $240K - $280K