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.
Role Overview
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.
Key Responsibilities
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Trading Engine Development: Develop the existing and new components within the trading engine while maintaining overall system design.
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Ownership of Engine Components: Grow into ownership of existing or newly developed trading engine components, such as pricing, market-making, hedging, etc.
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Performance Optimization: Continuously monitor and optimize trading engine performance.
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Systems Refactorization: Work on appropriate code modularization, versioning, deployment and test processes.
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Trading Infrastructure Development: Develop, improve and maintain overall trading infrastructure, including reference and market data, trades and balance dissemination services.
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Trading Engine Operations: Ensure that day-to-day trading operations run smoothly.
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Collaboration with Trading: Work directly with the trading team to understand their needs and deliver appropriate solutions that support the firm's strategic goals.
Requirements
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Education: Bachelor’s or Master’s degree in computer sciences, Computer Science, Engineering, or a related field.
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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
Preferred / Desirable Experience
- 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.
Deadline for applications: January 9th, 2026
Location and Right to Work: 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.