Core Developer

About G-20 Group

The G-20 Group is a pioneer in Quantitative Trading systems in cross-asset markets. Headquartered in Switzerland, we operate at the intersection of Quantitative Research, Software Engineering and Trading. The team combines a startup mindset with extensive experience in proprietary Trading, Technology and Quantitative Finance.

We are hiring a Core Python Developer to further develop and maintain the proprietary, in‑house trading engine. The role involves maintaining daily trading operations, developing scalable, high‑performance code, and optimizing system architecture.

The ideal candidate is self‑driven, motivated, responsible and highly responsive
, working independently to improve the existing code base while collaborating with cross‑functional teams. We look for strong expertise in Python, debugging, and system optimization, and a passion for delivering high‑quality, PnL‑focused solutions. Primary focus: core engine components, including trading engines, pricing, market‑making strategies, and underlying infrastructure.

• Develop new and existing components within the trading engine, maintaining overall system design.
• Take ownership of engine components such as pricing, market‑making, and hedging.
• Continuously monitor and optimize trading engine performance.
• Refactor code for modularity, versioning, deployment, and testing.
• Develop, improve, and maintain trading infrastructure (reference data, market data, trade and balance dissemination services).
• Ensure day‑to‑day trading operations run smoothly.
• Collaborate with the trading team to understand needs and deliver solutions that support strategic goals.

• Education:
  
  Bachelor’s or Master’s degree in Computer Science, Engineering, or related field.
• Experience:
  
  5+ years in software development, preferably in a high‑paced trading environment.
• Personal qualities: self‑driven, responsible, collaborative, effective in fast environments, strong communication.
• Tech skills:
  Proficiency in Python. Knowledge of Rust and React.js is a bonus. Unix systems, cloud platforms (AWS), real‑time data messaging (Redis, websockets), CI/CD tools (Jenkins, Supervisor, Docker) preferred.
• Fast problem‑solving and attention to detail.

• Familiarity with low‑latency, high‑throughput systems.
• Experience in finance or cryptocurrency sectors (nice but not mandatory).
• Experience in high‑paced production or trading environments.

January 9th, 2026

Full‑time, based in London office. Candidates must have the right to work in the UK.