Lead AI Engineer

On-site

$20K

Requirements

Our AI (TRAM) ingests global trade law, interprets it, resolves conflicts across jurisdictions, and produces compliance determinations more reliable than human experts.
THE ROLE You'll lead development of TRAM, our proprietary AI reasoning model that reads and interprets global trade law.
WHAT YOU'LL DO Within weeks: - Lead development of new features aimed at increasing TRAM’s test-time accuracy - Work on the underlying data and retrieval pipelines that help power our AI workflows - Work directly with our internal tax experts to understand how TRAM can better reason like them Within months: - Own TRAM’s eval framework and workflows - Work directly with leading frontier labs to reinforce fine tune models on our proprietary data
experience building AI enabled products, particularly RAG systems -
Experience fine tuning base models, ideally via RFT - Willingness to dive into tax technical problems - if you aren’t willing to dive deep on how the model should reason through the tax research process you won’t be effective - A strong understanding of how LLMs and reasoning models function NICE TO HAVES -
Experience working with LLMs on legal applications -
Experience with RAG data pipelines and collecting/curating data for the pipeline WHO YOU ARE You'll thrive here if: - You're a Dog.

We handle the entire lifecycle — calculation, registration, filing, remittance — at millisecond latency with zero downtime. - Backed by a16z and YC. $21M Series A, 30%+ month-over-month growth, customers include ElevenLabs, Replit, Deel, Runway, and Lovable. - Small team, global surface area.
Expanding into input tax, withholding, e-invoicing, tariffs — each multiplies the complexity.

ABOUT SPHERE Every breakthrough in trade infrastructure has followed the same pattern: reduce a transaction cost, expand the market.
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.
Everyone owns a domain that would be a full team at a larger company.
San Francisco, five days in office. - The problem keeps compounding.
Tens of millions of transactions today, billions ahead.
This isn't a lookup problem, it's a reasoning problem — and it only became solvable with LLMs.
You'll build the data pipelines that ingest legal sources, the model stack that produces structured evidence, the evaluation frameworks that measure accuracy, and the fine-tuning loops that improve performance.
The unusual constraint: you need speed, scale, correctness, and robustness simultaneously — at millisecond latency, zero downtime, heading toward billions of transactions where a single error costs a customer $20K.
You've been underestimated, gone through struggle, and never stopped running.