Principal Engineer C# (Front Office Trading Technology)

Principal Engineer (Front Office Trading Technology)

About the Opportunity

Our client is a leading global financial markets organisation seeking an exceptional Principal Engineer to lead the architecture, design, and delivery of a next-generation trading desktop platform. This is a rare opportunity to shape a greenfield initiative that will automate and streamline complex front-office workflows across a global trading business operating in highly demanding, real-time markets.

This is a highly visible player-coach position, combining deep hands-on engineering with architectural leadership. You will be instrumental in defining the technology strategy, establishing engineering standards, and driving delivery in partnership with global and offshore development teams. The role offers significant scope for influence and may evolve into formal leadership responsibilities.

The Role

As Principal Engineer, you will take ownership of the technical vision and delivery of a strategic trading platform from concept through to production. Working closely with trading, operations, compliance, and technology stakeholders, you will build robust, scalable, and high-performance solutions that support mission-critical front-office activities.

You will be expected to remain close to the code while guiding architectural decisions, mentoring engineers, and ensuring technology solutions align with both business requirements and enterprise standards.

Key Responsibilities

1. Lead the technical architecture, design, and hands-on development of a strategic trading desktop platform.
2. Take ownership of a greenfield technology programme, delivering scalable and resilient solutions from inception through production support.
3. Define and implement architectures that meet stringent non-functional requirements, including performance, responsiveness, security, fault tolerance, and process isolation.
4. Navigate enterprise architecture and governance frameworks while maintaining focus on business outcomes and delivery objectives.
5. Mentor and develop engineers, fostering technical excellence and supporting career growth across distributed teams.
6. Partner effectively with offshore development teams and third-party delivery partners.
7. Establish and promote best practices for AI-assisted software development, ensuring robust governance and code-review standards.
8. Communicate technical decisions, risks, and trade-offs clearly to both technical and non-technical stakeholders.
9. Drive continuous improvement initiatives, including refactoring activities and architectural evolution as the platform scales.

What We're Looking For Essential Experience

1. 10+ years of experience designing and delivering front-office trading technology within financial markets.
2. Proven track record leading engineering teams and delivering complex, multi-year transformation programmes.
3. Strong end-to-end software development lifecycle expertise.
4. Practical experience leveraging AI-enabled development tools throughout the software delivery process.
5. Excellent communication and stakeholder management skills within global, matrixed organisations.
6. Degree in Computer Science, Engineering, Mathematics, Physics, or a related analytical discipline.

Markets & Trading Knowledge

Candidates should bring a strong understanding of electronic trading environments and front-office workflow challenges, including:

1. Relative value and multi-leg trading strategies.
2. Futures and fixed income market structures.
3. Trade lifecycle processes, settlement, clearing, and margining concepts.
4. Order execution connectivity and messaging protocols such as FIX.
5. Global trading operations supporting multiple regions and time zones.

Technical Expertise Core Technologies

1. Expert-level proficiency in C# and .NET (modern LTS releases).
2. Strong experience building backend services using ASP.NET Core .
3. Deep understanding of event-driven and service-oriented architectures.
4. Experience designing production-grade messaging, API, and asynchronous workflow solutions.

Desktop & Front-End Technology

1. Experience building desktop applications that integrate web-based user interfaces.
2. Knowledge of technologies such as Electron, Tauri, or equivalent desktop-hosted web frameworks.
3. Understanding of WebSockets, local APIs, IPC mechanisms, and desktop integration patterns.
4. Working knowledge of React, TypeScript, and Node.js , with the ability to review code and make architectural decisions.

Architecture & Engineering Excellence

1. Experience working within formal architecture governance and review processes.
2. Strong understanding of identity management, access control, process isolation, and secure system design.
3. Familiarity with modern CI/CD pipelines and software delivery tooling.
4. Demonstrated success using AI-assisted coding agents within structured development workflows.

Desirable Experience

Any of the following would be advantageous:

1. Experience with desktop interoperability frameworks and messaging standards.
2. WPF or other rich-client .NET application development.
3. Integration with third-party market data and desktop platforms.
4. Performance engineering and low-latency system optimisation.
5. High-throughput market data or trade-processing platforms.
6. Cloud technologies, containerisation, and orchestration platforms.
7. Data modelling, relational databases, and API/data contract design.
8. Design systems and component library development.