Senior FIX Protocol Developer

Solytics Infotech; Greater London; On-site; GBP 80,000 - 100,000; Full time

Job summary

Solytics Partners Careers in Greater London is seeking a Senior FIX Protocol Developer to join their Front Office Market Connectivity team. This role focuses on designing and maintaining FIX-based connectivity for exchanges and brokers, with a strong requirement for expertise in C#/.NET and electronic trading. Ideal candidates will have 8+ years of relevant experience and have contributed to QuickFIX. The position offers a hybrid working model.

Qualifications

• 8+ years of experience in electronic trading or market connectivity development.
• Strong hands-on experience with C#/.NET is essential.
• Direct exposure to Power and Gas trading markets is required.

Responsibilities

• Design, develop, and maintain FIX-based market connectivity solutions.
• Build and enhance connectivity using the FIX protocol.
• Own and support connectivity components in production.

Skills

FIX protocol expertise

C#/.NET development

Market connectivity

Low latency optimization

Troubleshooting in production

Tools

QuickFIX

Job description

Solytics Partners is a Global Analytics firm, recognized with multiple industry awards for innovation and excellence. Our team comprises experts with deep domain knowledge in risk, analytics, AI/ML, AML/FCC, and fraud. By converging this expertise with cutting‑edge technologies like AI, Machine Learning, Generative AI, and Large Language Models (LLMs), we deliver powerful automated platforms and incisive point solutions.

Our offerings enable clients to streamline and future‑proof their risk, AML, and analytics processes, comply seamlessly with global regulations, and safeguard financial systems. Whether it’s solving complex challenges or driving operational efficiency, Solytics Partners is committed to empowering organizations with transformative tools to stay ahead in an evolving regulatory landscape.

Job Type: Inside IR 35 Contract for 1 year

Job Location: London, Hybrid

Job Summary

We are seeking a Senior FIX Protocol Developer to join a Front Office Market Connectivity team supporting Power and Gas trading. This role is focused on designing, building, and maintaining FIX‑based connectivity to exchanges, brokers, and counterparties, rather than purely trading applications. The ideal candidate will be a FIX protocol expert with strong C#/.NET development skills, deep understanding of electronic market connectivity, and direct experience working in Front Office environments. Highly desirable candidates will have contributed to, or authored components of, the QuickFIX open‑source project, demonstrating strong protocol‑level expertise and engineering rigor.

Key Responsibilities

• Design, develop, and maintain FIX‑based market connectivity solutions for Front Office trading systems
• Build and enhance exchange, broker, and counterparty connectivity using FIX protocol
• Implement FIX session management, order lifecycle handling, custom tags, and extensions
• Optimize connectivity for low latency, high throughput, and high availability
• Work closely with traders, connectivity teams, and infrastructure to deliver resilient solutions
• Own and support connectivity components in production, including troubleshooting and incident resolution

Key Requirements

• 8+ years of experience in electronic trading or market connectivity development
• Expert‑level knowledge of FIX protocol, including session management and message flows
• Authored or contributed to the QuickFIX open‑source project
• Deep experience with FIX engines such as QuickFIX or similar frameworks
• Strong hands‑on experience with C#/.NET
• Solid experience building and supporting market connectivity (exchanges, brokers, gateways, adapters)
• Direct exposure to Power and Gas trading markets
• Strong understanding of trading workflows, market structure, and connectivity architectures