Hays
Senior EFX Developer | FX eTrading Transformation | London (Hybrid)
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Location: London, UK (1 day per week onsite at Triton Square) Contract Type: Contract / Consultancy Sector: Investment Banking | Electronic Trading | Foreign Exchange (FX)
Hays is partnering with a leading global investment banking organization undergoing a major transformation within its FX Electronic Trading (eFX) division. As part of a strategic multi-year modernization program, our client is completely redesigning its pricing, trading, hedging, risk, and booking platforms, replacing legacy vendor solutions with cutting-edge in-house Java-based systems.
We are looking for an experienced Senior EFX Developer to join a highly skilled international engineering team and play a key role in building the next generation of low-latency electronic trading platforms.
This is an exciting opportunity to work on business-critical systems handling large volumes of real-time market data and trading activity, using modern technologies and best-in-class engineering practices.
Responsibilities
- Design and develop high-performance, low-latency trading applications within the FX electronic trading ecosystem.
- Build scalable and resilient components for pricing, trading, hedging, risk management, and trade processing.
- Contribute to the strategic migration from third-party vendor platforms to proprietary Java-based solutions.
- Optimize application performance, latency, throughput, and resource utilization.
- Develop and maintain connectivity with major electronic trading venues and liquidity providers such as Bloomberg, FxAll, and 360T.
- Improve system observability, monitoring, instrumentation, and operational resilience.
- Collaborate closely with Product Owners, Business Analysts, Quantitative teams, and fellow engineers across multiple international locations.
- Mentor junior developers and promote engineering excellence through best practices in coding, testing, and software design.
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Required Skills & Experience
Technical Skills
- Strong commercial experience with Java 17+.
- Expertise in low-latency and high-performance development.
- Deep understanding of:
- Garbage Collection (GC) tuning
- JVM performance optimization
- OS-level performance tuning
- Zero-copy and zero-GC design techniques
- Strong experience with the FIX Protocol.
- Experience with low-latency messaging technologies, including:
- Aeron
- Agrona
- Chronicle
- Knowledge of optimized serialization and transport protocols:
- SBE
- Protocol Buffers (Protobuf)
- Experience with distributed systems and caching technologies such as:
- Hazelcast
- Redis
- Oracle Coherence
- Similar technologies
Business Knowledge
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- Strong understanding of the FX trading domain.
- Experience with:
- Spot FX
- Forwards
- NDFs
- Pricing engines
- Liquidity management
- Hedging platforms
- Knowledge of:
- RFQ trading workflows
- Streaming pricing protocols
- Market-making systems
- Order management platforms
What We're Looking For
The ideal candidate is a hands-on senior engineer with a proven track record of delivering production-grade trading systems in demanding, low-latency environments. You will be comfortable taking ownership of complex technical challenges, driving architectural decisions, and leading by example within a collaborative engineering culture.
What's on Offer
- Opportunity to join a large-scale strategic transformation programme within a leading investment banking environment.
- Exposure to state-of-the-art electronic trading technologies.
- Work alongside highly skilled engineering teams across the UK, Spain, Poland, and LATAM.
- Long-term contract engagement.
- Hybrid working model with only one day per week onsite in Central London.
- Significant influence on the architecture and development of next-generation FX trading platforms.
If you have a passion for low-latency systems, electronic trading technologies, and high-performance Java development, we'd love to hear from you.
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