Trading Systems Engineer

What You Will Do • Write and maintain JavaScript / Node.js code for automated trading systems, background jobs, and market data ingestion • Contribute to Go services where concurrency and predictable behavior matter • Rewrite outdated or messy JavaScript services in Go • Work across multiple repositories communicating via WebSockets, Redis, and HTTP • Debug real production issues in live systems • Move fast: build, break, fix, and ship • Gradually take ownership of small but critical parts of the system What We're Looking For • Comfortable with JavaScript / Node.js • Some exposure to Go, or interest in learning it • Understanding of async code, OOP, and event-driven systems • Not afraid of messy codebases or unfamiliar repos • Able to move quickly, ask questions, and take feedback well • Strong debugging instincts • Startup, side-project, or self-taught engineering background • Flexible availability, including occasional nights or weekends Nice To Have • Betting, trading, or market-related experience • Experience with real-time systems (WebSockets, Redis, pub/sub) • Some infrastructure or Linux experience • Bonus: scraping or automation experience (Playwright, Puppeteer, Selenium) What This Role Is • A high learning-curve role with an emphasis on getting systems into production • Direct visibility into how real-world trading systems are built • Working closely with a small, highly involved team • Shipping code that runs live with real money What This Role Isn't • No formal onboarding or extensive documentation • Not a heavy-process environment (minimal tickets, meetings, or planning cycles) Base salary: $100,000+ annually, depending on experience and role fit Structure: Role begins with a 1–2 month paid contract engagement, followed by full-time conversion upon mutual fit Equity: Available for the right candidate About 4C Software 4C Software builds the technology powering one of the largest sports prediction markets in the world, with $750M+ traded on the platform this year. We also develop automated trading and market infrastructure software that operates on multiple platforms at a significant scale. We’re a small team working in a fast-paced environment, building systems that run live with real money in production. Our team is based in Chicago, but this role is fully remote. Apply tot his job