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 Apply tot his job