Senior Fullstack Engineer (San Francisco Onsite)

Senior Full Stack Engineer

Sphere is looking for a versatile full stack engineer who can jump on different mission critical areas to help accelerate its production - e.g. filing infrastructure, tax engine and new product areas (input tax, withholding tax, e-invoicing). These areas are key levers towards scaling Sphere and growing ARR, meaning that your work will have a direct impact on the growth of the business.

Job Description

Mission :

Sphere has built the world's first AI-native tax engine that helps companies like Lovable, 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 Lovable, 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 a16z, Felicis Ventures and YC

Sphere is looking for a versatile full stack engineer who can jump on different mission critical areas to help accelerate its production - e.g. filing infrastructure, tax engine and new product areas (input tax, withholding tax, e-invoicing).

These areas are key levers towards scaling Sphere and growing ARR, meaning that your work will have a direct impact on the growth of the business

Why this is a massive opportunity :

The market is enormous : This is a 'need to have' solution for every business around the world. It's becoming increasingly hard to ignore (see below) and if businesses don't collect and remit indirect tax, they end up paying for it out of pocket later.

Strong macro tailwinds : Businesses are going global earlier and earlier and they're not equipped to deal with cross border compliance. Additionally, tax authorities are clamping down on cross border tax compliance which means demand for this solution will continue to grow (e.g. EU forcing payment processors to hand over tax evaders).

AI has changed the game : a lot of processes related to tax compliance / research have been extremely manual and cumbersome to date. That's why incumbents like Avalara, Vertex, Anrok haven't been able to move outside the US. LLMs have changed that and can automate a lot of what tax researchers do.

Product vision : We believe that our AI-native tax engine will be the foundation of a broader cross border compliance platform that help businesses go global from day 1 (think input tax, withholding tax, customs). We want to be the Deel for international billing.

What you will do : Within weeks :

Within months :

What's important to us :

Requirements :

Nice to have :