Core C++ Developer (London)

About G-20 Group

G-20 Group is a leading cross-asset trading firm active in delta-one and derivatives markets. Established in 2010, G-20 offers liquidity solutions, treasury management, and institutional advisory services. We are supported by an outstanding team of professionals, with a robust global presence in EMEA, Americas, and APAC.

Role Overview

We are seeking a highly skilled and motivated Core C++ Developer to join our London team 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 as 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 C++ 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

• 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 infrastruc-ture, 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.

Requirements

Education: Bachelor’s or Master’s degree in computer sciences, Computer Science, Engineering, or a related field.

Experience: At least 3+ years or more of experience in software development, ideally in a high-paced trading environment.

Personal Qualities:

• 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.

Tech Skills:

• Proficiency in C++ (Cxx-17).
• Familiarity with Rust is a significant bonus, Python desired.
• Proficiency in Unix based systems.
• Experience of cloud-based platforms (AWS).
• Experience with real-time data messaging (websockets, Redis).
• Experience with CI/CD tools, Jenkins, Supervisor and docker.
• 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.
• Experience with high-paced production or trading environments.

Location and Right to work: This role will be based in our London office. Only candidates who reside in the UK and possess the pre-existing right to work in the UK without needing company sponsorship 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.