Software Engineer, Backend Systems

Software Engineer, Backend Systems

Company: Fullstack
Location: New York, NY (on-site)
Compensation: $185,000 - $300,000 + competitive equity
Employment Type: Full-time
Visa Sponsorship: TN and H-1B transfers only (excluding H-1B holders in year 3 or year 6)

About Fullstack

Fullstack is building a single front end for crypto trading. Today retail traders are spread across multiple front ends, browser-extension wallets, bridges and a growing list of venues. Fullstack brings perpetuals, cross-chain spot and prediction markets into one portfolio-margin trading experience with a single unified balance, extending USDC collateral to the venues of each user's choice.

One co-founder built Insilico Terminal, which the company describes as the leading order execution and management system for centralized exchanges; the other ran one of the top on-chain and centralized-exchange high-frequency trading firms. Fullstack has raised $15M+ and has a team of about 10.

The Role

Fullstack is looking for a backend engineer with production Rust experience to help build the infrastructure behind its real-time trading platform: risk, settlement, market data and the APIs traders depend on. This role suits someone with strong asynchronous programming, solid systems knowledge and a performance-driven mindset who thrives in a collaborative, in-person environment.

What You Will Do

• Build and maintain risk and liquidation engines that improve capital efficiency in volatile markets.
• Design and implement the blockchain state machines that power trading, settlement and risk.
• Build services that keep state consistent across asynchronous processes using voting, consensus and coordination.
• Process live market data and coordinate actions across trading venues over WebSocket streams.
• Build high-performance REST and WebSocket APIs with millisecond-level response times.

What You Bring

• 2-4 years as a backend software engineer
• In-depth production experience with Rust
• Strong asynchronous programming (Tokio a plus) and distributed systems knowledge
• A performance-driven mindset for latency-sensitive, real-time systems
• Ability to work on-site in New York

Tech Stack

Rust, Tokio, distributed systems, blockchain, REST APIs, WebSocket APIs, Docker

REVENUE: 25% of first-year salary. Est. fee per hire $46K-$75K; 4 seat(s) = up to $243K if all filled.

TARGET COMPANIES (suggested): Hyperliquid, Coinbase, Jump Crypto, Wintermute, dYdX, Kraken.

BEST-FIT CANDIDATE: 2-4 yrs; production Rust; async/distributed; visa: TN or H-1B transfer only (not yr 3/6); location: NYC on-site.