Skills

Communication Leadership Python Java C# SQL DevOps Docker Test Attention to detail Architecture SQL Server Azure C++ .NET Kafka

Job Specifications

Software Engineer (Senior) - C#/.Net & SQL Server | Trading Desk Engineering | Hedge Fund

London (primarily office based in Liverpool Street)
Permanent, Full-time
£120,000 – £160,000 base + discretionary bonus (of up to 100%)

The role:

This is an opportunity to join a systematic trading firm as a Senior Software Engineer working directly with the trading desk on the platform that executes trades in live markets.

You will be based in the firm’s Liverpool Street front-office trading floor working alongside the traders, senior engineers and the CEO. The firm has around 18 employees, with roughly 9 engineers today (growing to 10). Technology sits at the centre of the business, and engineers work directly on the systems that power trading activity.

The environment is fast-paced and trading desk focused, meaning you will regularly context switch between development work and real-time trading needs. You will work closely with end users and have direct access to senior leadership, especially the CEO, so strong communication, attention to detail and empathy for users is important. The role focuses on evolving an established platform while contributing to the longer-term modernisation of the architecture.

Non-Negotiables:

Strong software engineering experience (C# preferred but Java, or C++ considered)
Strong SQL / relational database experience
Careful approach to testing and safe refactoring
Clear, concise technical and verbal communication
Have previously worked for a Financial Service organisation or for a software vendor that’s utilised within the Financial Service industry.

What You’ll Work With

C#
.NET Framework
SQL Server
WinForms desktop applications
Azure infrastructure
Legacy platform modernisation
Automated testing
Kafka

Future platform direction includes:

Docker / containerisation
Modernised execution architecture

Core Responsibilities:

Maintain and improve the trading execution platform
Refactor and enhance a long-lived C#/.NET application
Make safe changes to legacy code while preserving behaviour
Write tests that validate and document system behaviour
Deliver small, well-structured changes with clear commits
Work with traders to support real-time trading needs
Improve system usability and operational efficiency
Contribute to the future rebuild of the execution platform
Collaborate with engineers across trading systems and infrastructure

Examples of the kinds of changes you’ll make to the application:

Incremental changes, tweaks and improvements across the execution platform
Adding new features that support trading workflows and strategies
Cleaning up parts of the UI to improve usability
Simplifying the platform so junior engineers can build starter algorithms without relying on senior leadership for every change

Nice to Haves

Exposure to futures, options, or crypto markets
Experience improving legacy or difficult-to-test systems
Experience refactoring large codebases
Exposure to Python or DevOps tooling
Experience in smaller, high-ownership engineering teams

Why Join

You will join a small, engineering-led systematic trading firm where software sits at the core of the business. Around half the company is technical, and engineers work directly on the systems that drive trading performance.

The trading desk engineering role offers unusually close collaboration with traders and senior technical leadership, giving you real insight and influence over how the platform evolves.

Software Engineer (Senior) - C#/.Net & SQL Server | Trading Desk Engineering | Hedge Fund

About the Company

We are Prism Digital, your DevOps and Cloud talent partner. Proud sponsors and co-organisers of the London DevOps meetup group. We are a niche consultancy with a tight focus on driving quality over quantity. We pride ourselves on our consultative approach, our extensive knowledge of the DevOps, Cloud and infrastructure sector and most importantly how important great talent is to help your company grow and succeed. We offer: • Expertise in Cloud (AWS, Azure, GCP), Linux, Windows, CI/CD, Configuration Management, IaC, Cont... Know more