Senior Software Engineer, Exchange

Underdog Fantasy

Senior Software Engineer at Underdog designing and scaling core exchange infrastructure for prediction markets. Building APIs and optimizing performance for high throughput trading systems.

Posted 5/20/2026full-timeRemote • 🇺🇸 United StatesSenior💰 $160,000 - $240,000 per yearWebsite

Tech Stack

Tools & technologies

GoJavaRust

About the role

Key responsibilities & impact

Build and scale core exchange infrastructure - order matching, trade execution algorithms, and the data structures that underpin them
Build APIs and data feeds that clients depend on - REST, FIX, WebSockets - and make them fast and reliable
Design robust clearing infrastructure, position management, margining, and how money actually moves.
Drive technical relationships with our customers (market makers, traders, etc.)
Hunt down performance bottlenecks - in databases, internal services, and anywhere latency is costing us
Put systems under pressure before production does - rigorous testing of the things that can't go down
Help invent what prediction market structure looks like beyond what exists today - new contract types, new mechanics, etc.
Move fast, make calls, and own the outcome - we give real autonomy, which means real accountability.

Requirements

What you’ll need

At least 5+ years of engineering experience, with a track record on high-performance, low-latency systems
Strong command of highly performant programming languages (C, Rust, C++, Go, Java, or similar) and the willingness and desire to flex into others.
You are product minded and scope well, you make good tradeoffs, and don't need hand-holding.
Demonstrable experience thriving in fast-paced and ambiguous environments, where high-agency and ambition go hand-in-hand.
Experience in TradeFi, prediction markets, crypto exchange infrastructure or SOR.

Benefits

Comp & perks

Unlimited PTO for full-time employees (we're extremely flexible with the exception of the first few weeks before & into the NFL season)
16 weeks of fully paid parental leave
Home office stipend
A connected virtual-first culture with a highly engaged distributed workforce
5% 401k match, FSA, company paid health, dental, vision plan options for employees and dependents

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

CRustC++GoJavaorder matchingtrade execution algorithmsAPIsdata feedsperformance optimization

Soft Skills

product mindedscope wellmake good tradeoffshigh-agencyambitionautonomyaccountabilitythrive in fast-paced environmentsdrive technical relationshipsrigorous testing