Senior Software Engineer

Tariffs don’t have to be money lost forever. Pax claws it back. Pax helps retailers, manufacturers, and wholesalers get refunds when they pay tariffs. We’re building the control center for U.S. duty drawback—a $10B/year opportunity hiding in plain sight. We use AI and automation to recover tariffs paid by importers when goods are later exported, returned, or destroyed. Most companies don’t even realize they’re eligible.

We make sure no dollar is left behind. Tariffs have been top of mind for everyone. Companies have gone from paying 25% to 145% tariffs. There’s never been a better time to make a real world impact on real businesses. We’re well-capitalized and looking for a senior software engineer to take core ownership of our product.

• Own major features end-to-end: API design, backend logic, frontend UI, and everything in between
• Build tools that make complex regulations feel like magic
• Work closely with customers to understand what matters, then ship fast
• Help shape our engineering culture, system architecture, and technical roadmap
• Solve real problems for real businesses, not imaginary ones

• Has built and shipped meaningful software at high-growth startups or tech-forward companies
• Can go deep on backend architecture and also cares that the UI feels crisp
• Interested in building with LLMs to solve real world problems
• Understands tradeoffs, knows when to move fast, and when to polish
• Is comfortable with ambiguity and thrives in early-stage environments
• Doesn’t need permission to start something, but knows when to ask for input
• Wants to own real outcomes—not just code
• Has experience with frameworks like React, Next.js, FastAPI, SQLModel, Postgres, etc.

We’re a small team by design. Your work will shape the future of the company—and the $10B+ industry we’re transforming. This will be the most fulfilling work of your career.

We work from San Francisco
, in-person. Our office is focused, fast, and full of energy.

If you’ve built something you’re proud of, we want to see it.