Core Developer

About G20 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.

The G-20 London Office is seeking a highly skilled and motivated Core Python Developer to further develop and maintain the proprietary, in-house trading engine.

We are seeking a candidate with a strong background in building large-scale low-latency systems
. The role involves maintaining daily trading operations as well developing scalable, high-performance code, optimizing system architecture and modularity to ensure seamless operations and functionality.

The ideal candidate will be self-driven, motivated, responsible and highly responsive
, working independently to develop and improve the existing code base, while collaborating closely with diverse cross-functional teams of stakeholders and fellow developers. We are looking for someone with strong expertise in python programming, debugging, and system optimization, who is passionate about delivering practical, high-quality, PnL-focused solutions.

The primary focus for this role will be working on core engine components, including trading engines, pricing, market making strategies and underlying trading infrastructure.

• Trading Engine Development: Develop the existing and new components within the trading engine while maintaining overall system design.
• Ownership of Engine Components
  :
  Grow into ownership of existing or newly developed trading engine components, such as pricing, market‑making, hedging, etc.
• Performance Optimization
  :
  Continuously monitor and optimize trading engine performance.
• Systems Refactorization: Work on appropriate code modularization, versioning, deployment and test processes.
• Trading Infrastructure Development
  :
  Develop, improve and maintain overall trading infrastructure, including reference and market data, trades and balance dissemination services.
• Trading Engine Operations: Ensure that day‑to‑day trading operations run smoothly.
• Collaboration with Trading
  :
  Work directly with the trading team to understand their needs and deliver appropriate solutions that support the firm’s strategic goals.

• Education
  :
  Bachelor’s or Master’s degree in computer sciences, Computer Science, Engineering, or a related field.
• Experience
  :
  At least 5+ years’ experience in software development, ideally in a high‑paced trading environment.

• self-driven, motivated, responsible and highly responsive individual.
• mature enough to work collaboratively on the existing code base.
• ability to work effectively in a fast-paced trading environment.
• strong and tactful communication skills, both verbal and written

• Proficiency in Python and Async
  . Rust and React.js are bonuses.
• Proficiency in Unix based systems.
• Experience of cloud‑based platforms (e.g. AWS).
• Experience with real-time data messaging (e.g. Redis, websockets).
• Experience with CI/CD tools, Jenkins, Supervisor and docker in particular
• Fast problem‑solving skills, combined with attention to details

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

Final date to receive applications: January 9th, 2026

This role will be based full time from our London office. Only candidates who possess the right to work in the UK need apply
.

Join G-20 and be a part of a team that is at the forefront of financial markets, driving innovation and excellence in the sector.