Software Engineer - FIX Connectivity

Referment; Greater London; On-site; GBP 60,000 - 100,000; Full time

Job summary

An innovative hedge fund is seeking a skilled Software Engineer to enhance their trading systems with FIX protocol expertise. You'll join a dynamic team, focusing on building robust solutions that integrate seamlessly with trading workflows. This role offers the chance to work in a fast-paced environment, contributing to mission-critical systems that directly impact trading success. If you're passionate about technology and eager to make a difference in capital markets, this opportunity is perfect for you.

Qualifications

• Proven experience delivering FIX protocol solutions in trading environments.
• Strong C#/.NET development skills with multi-threading expertise.

Responsibilities

• Lead implementation of FIX connectivity solutions for trade execution.
• Collaborate with stakeholders to understand trading needs.

Skills

C#/.NET Development

FIX Protocol

SQL Server

Python Scripting

Multi-threading

Design Patterns

Real-time Systems

Tools

Git

JIRA

KDB+

Job description

1 week ago Be among the first 25 applicants

This range is provided by Referment. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

Base pay range

Referment is partnering with a top-performing hedge fund that is seeking a Software Engineer with strong FIX connectivity experience to join their high-calibre Engineering team. This is an exciting opportunity to contribute to a world-class trading environment that values autonomy, innovation, and technical excellence.

You will join a tight-knit team of developers, building and supporting tools that underpin the fund’s trading and investment workflows, with a particular focus on trading systems integration and FIX protocol. This is a highly visible role, working closely with traders, portfolio managers, and other stakeholders to deliver robust solutions across the full SDLC.

Technologies & Platform:

Core platform: .NET (C#), SQL Server, KDB+.

Messaging and connectivity: FIX protocol, REST APIs.

Key Responsibilities for the role include:

• Lead the implementation and enhancement of FIX connectivity solutions for trade execution and post-trade workflows.
• Collaborate with internal stakeholders to understand business and trading needs.
• Build reusable components to improve scalability and system performance.
• Ensure robust, low-latency, and high-throughput integration with external venues and counterparties.
• Monitor and support live trading environments and troubleshoot FIX-related issues.
• Contribute to the broader engineering strategy and codebase via design reviews and clean, testable code.
• Proven experience delivering and supporting FIX protocol-based solutions in a trading or capital markets environment.
• Strong C#/.NET development skills with solid understanding of multi-threading, architecture, design patterns, and real-time systems.
• Python proficiency for scripting and API development.
• Experience working across the full SDLC in fast-paced financial environments.
• Strong background with relational databases (SQL Server) and modern dev tools (Git, JIRA, etc.).

This is a unique opportunity to become part of a collaborative and innovative team within a leading hedge fund, where you’ll work on mission-critical systems and directly impact trading success.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Information Technology

• Industries

  Capital Markets and Financial Services

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