Software Engineer (Senior)

About the role

Our Mission

Global trade is one of the hardest, highest-stakes industries in the world and the software that runs it has never kept up.

Pax is changing that.

Pax is the AI control tower for global trade. Enterprises like Verkada, Glossier, Yamaha, and Kodak use Pax as the intelligence layer for their trade-compliance operations: connecting fragmented data, continuously auditing transactions, preparing and filing claims, and recovering money that has quietly slipped away for years.

We started with duty drawback, a $10B-per-year opportunity hiding in plain sight. Now, we’re building the operating system for how enterprises manage trade compliance and recover every dollar they’re owed.

Our platform includes:

- Duty drawback: Recover tariffs paid on goods that are later exported, returned, or destroyed. (Live.)

- IEEPA and reciprocal tariff recovery: Claim refunds associated with the latest wave of tariffs. (Live.)

- Entry and export audits: An AI agent that reviews customs transactions line by line and catches errors before they reach U.S. Customs and Border Protection. (Shipping now and you could own a meaningful part of it.)

This is only the beginning. Our goal is to build the complete control tower for global trade.

Tariffs have become a board-level concern. Companies have faced rates ranging from 25% to 145%, creating an urgent need for software that can turn complex regulations and fragmented records into accurate, actionable decisions. There has never been a better time to make a tangible impact on real businesses.

Who’s building this

Pax was founded by people who lived this problem.

Penny Chen, our CEO, holds a PhD from MIT and previously built optimization systems at Flexport and for Amazon’s last-mile supply chain. Chris Le is a repeat founder who previously worked at Brex, TikTok, and Amazon, including on last-mile supply-chain optimization.

We started Pax after seeing billions of dollars in refunds go unclaimed while working alongside the importers entitled to them.

We’re well-capitalized, serve real enterprise customers, and are looking for a senior software engineer to take ownership of critical products and systems. This is an opportunity to join early enough to shape the company, its engineering culture, and the future of a $10B-plus industry.

What you’ll do

- Own major product areas end to end, from customer problem and technical design through implementation, launch, and iteration

- Design durable APIs, data models, workflows, and system boundaries for products operating on high-stakes financial and regulatory data

- Build across the stack, including backend systems, data pipelines, AI-powered workflows, and polished customer-facing interfaces

- Turn complex regulations and messy trade data into products that feel simple and reliable

- Work directly with enterprise customers to understand their operations, identify the real problem, and ship solutions quickly