Software Engineer - FIX Connectivity

JR United Kingdom; London; On-site; GBP 60,000 - 100,000; Full time

Job summary

An established industry player in the hedge fund sector is seeking a skilled Software Engineer specializing in FIX connectivity. This role offers the chance to work within a high-caliber engineering team, contributing to a world-class trading environment. You will be responsible for implementing robust solutions that enhance trade execution and post-trade workflows. With a focus on low-latency integration and high-throughput systems, you'll collaborate closely with traders and portfolio managers. This is a unique opportunity to make a significant impact in a fast-paced financial setting, where innovation and technical excellence are paramount.

Qualifications

• Strong C#/.NET development skills with a solid understanding of multi-threading.
• Proven experience delivering FIX protocol-based solutions in trading environments.

Responsibilities

• Lead the implementation and enhancement of FIX connectivity solutions.
• Collaborate with stakeholders to understand business and trading needs.

Skills

C#

.NET

FIX protocol

SQL Server

Python

REST APIs

Multi-threading

Tools

Git

JIRA

Job description

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Software Engineer - FIX Connectivity, london

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Client:

Referment

Location:

london, United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Views:

5

Posted:

05.05.2025

Expiry Date:

19.06.2025

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Job Description:

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.