Senior Software Engineer, Auctions

Alt Platform Inc•New York, NY

12d•$200,000 - $220,000•Remote

About The Position

Alt is unlocking the value of alternative assets, starting with the $5 B trading-card market. We let collectors buy, sell, vault, and finance their cards in one place and we are backed by leaders at Stripe, Coinbase, Seven Seven Six, and pro athletes like Tom Brady and Giannis Antetokounmpo. Our next frontier is real-time pricing at scale—the Alt Value that powers every trade, loan, and product on the platform. The last ten seconds of an auction are the whole product. Hundreds of people who have been watching one card for a week all arrive at once, every one of them refreshing, every one of them bidding. That's this job. You build and scale the high-concurrency bidding and listing systems behind nine figures of annual GMV, and you build the surfaces on top of them. Not one or the other. The low-latency backend logic that resolves a bid and the responsive real-time UI where a collector watches it land are the same feature, and they're both yours. The number this team is measured on: auction GMV. Every system here either moves it or protects it.

Requirements

5+ years building and scaling complex applications — Python, Postgres, AWS or comparable cloud infrastructure.
Deep experience with React, TypeScript, and building high-performance real-time UIs.
A track record of building systems that stay up when the stakes and the traffic are highest.
Experience turning LLMs or computer vision models into practical, user-facing features that solved a real business problem.
Product instincts: understanding the collector mindset and building things that delight them.
High agency: thriving where expected to find the highest-leverage work and execute it without a hand-holding manual.

Nice To Haves

Experience with personalization engines, recommendation systems, or AI/ML integrations.
Startup experience.
You collect, or you have a view on where this market is going.

Responsibilities

Build and scale the high-concurrency bidding and listing systems that power nine-figure annual GMV. Thundering herd in the closing seconds is a design constraint, not an incident.
Develop the next generation of features that use AI to give consignors and sellers instant valuations and upfront liquidity.
Use data and machine learning to match unique, one-of-one collectibles to the right buyers.
Design and launch the management tools that high-frequency sellers and veteran hobbyists actually need.
Own the entire experience, from backend bid resolution through the responsive UI where the action happens.
Mentor the team and set the standard for code quality, reliability, and performance.