Senior low-latency Core Java Developer

Overview

Contract Role – Senior Low-latency Core Java Developer – London/Hybrid – 12 months initial – Inside IR35

• Job Title: Senior Low-latency Core Java Developer
• Location: Hybrid – 4 days onsite per week in London
• Contract Type: Contract
• Duration: 12 months initial
• Core focus is hands-on low-latency Java development
• Exposure to low-latency trading systems in banks or similar institutions
• Experience building or contributing to low-latency systems
• Typically around 10+ years overall engineering experience
• Ideally ~4-5 years working on low-latency systems (flexible if strong elsewhere)
• Has worked on systems handling very high throughput (e.g. billions of events/day)
• Able to design and implement components within a Java-based system
• Comfortable working in finance/trading environments (FX preferred)
• FX / electronic trading experience (spot, forwards, swaps, execution systems) (preferred)
• Some familiarity with rates or equities environments acceptable
• Crypto experience is less relevant (not ideal for latency expectations)
• Nice-to-have technologies: KDB (but not required), Solace messaging (nice to have). Kubernetes / cloud / messaging tech (not core focus for this role)
• Has worked in multiple complex production systems (often banking/trading firms) Must be able to work from a high-level “loose” specification
• Expected to: Break down epics into Jira tasks, estimate and plan their own work, work fairly independently
• Strong hands-on coding role (not architecture-only)

Not looking for

• Pure microservices / REST-only backend developers
• Candidates with misleading CVs (claims of low-latency without real experience)
• Pure UI/front-end developers (React/TypeScript not needed)
• Very junior engineers or those with only brief exposure to low-latency systems

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