Principal .Net Software Engineer

MCS Group

Belfast, Northern Ireland💼 Full-time💰 $58,000–$58,000🗓 2026-07-02 → 2026-08-07

Core

Lead technical direction and architecture for large-scale, business-critical financial platforms.

Role type

Principal Software Engineer (.NET)

Builds

Scalable, resilient enterprise applications and distributed systems for global financial services.

Domain

Financial services / Trading platforms

Deliverable

production ML models | product features | infrastructure

Required skills

C#, .NET / .NET Core, distributed systems, cloud technologies (AWS/Azure), REST APIs, event-driven architectures, team leadership in Agile environments

Preferred skills

FIX protocol, WPF, React, microservices

Technologies

C#, .NET, .NET Core, AWS, Azure, React, WPF

Responsibilities

Take ownership of technical direction, lead a high-performing engineering team, shape architecture of large-scale platforms, design scalable and resilient enterprise applications

Seniority

Principal, hands-on IC with leadership

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About MCS Group

Our client is a leading RegTech and tax technology scale up headquartered in London that builds automation platforms used by banks, financial institutions and enterprise organisations to manage complex regulatory and tax reporting across multiple jurisdictions. Their technology helps clients stay compliant with fast-changing legislation by translating regulation into scalable, automated workflows and platform capabilities. As the business continues to grow and onboard larger enterprise clients, they are expanding their regulatory product capability and are looking for a regulatory-focused Prod