Server-Side C# Engineer – Build at Scale, Influence Architecture, Work Flexibly

JR United Kingdom; Peterborough; On-site; GBP 55,000 - 80,000; Full time

Job summary

A cutting-edge company is seeking a Server-Side C# Engineer to join their senior-led team in Peterborough. You will tackle complex engineering challenges on a next-generation SaaS platform focusing on event-driven architecture and distributed systems. This role offers flexible hours, mentorship opportunities, and the chance to influence system architecture deeply. If you have a strong background in C#/.NET and modern engineering practices, this is an exciting opportunity to make a significant impact.

Benefits

Flexible hours

Team of experienced professionals

Relaxed, mature setup

Input into architecture

Qualifications

• Approximately 8 years of commercial server-side experience in C#/.NET.
• Experience implementing event sourcing and DDD in production.
• Proficiency in asynchronous message-based systems.

Responsibilities

• Work on a greenfield microservices platform with 24+ services.
• Mentor and train other engineers in a hands-on leadership role.
• Contribute to architectural direction as part of a mature agile team.

Skills

C#/.NET

Event Sourcing

DDD

Messaging Tech

Job description

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Server-Side C# Engineer – Build at Scale, Influence Architecture, Work Flexibly, Peterborough

Our client is on a mission to simplify complex delivery infrastructure and has built a next-generation SaaS platform that is scaling internationally. With the UK launch completed and a US rollout underway, they are tackling significant engineering challenges and delivering powerful technology at scale.

They are seeking a highly skilled server-side C# engineer to join their lean, senior-led engineering team. The role involves working on a platform that pushes boundaries in event-driven architecture, distributed systems, and customer-first delivery.

What You’ll Work On:

• A greenfield microservices platform (24+ services) built around CQRS, Event Sourcing, and DDD
• High throughput transactional systems processing tens of thousands of requests per hour
• Real-time tracking and customer self-service layers designed to minimize support tickets
• A technically mature, agile team where every developer contributes to architectural direction

Tech Snapshot (and What You Must Know Cold):

• C#/.NET: Approximately 8 years of commercial server-side experience, ideally across multiple codebases and domains
• You will mentor and train other engineers—this is a hands-on leadership role
• Event Sourcing & DDD: You must have commercial experience implementing, supporting, and evolving these patterns in production
• Messaging Tech: Proficiency in at least one asynchronous message-based system (e.g., RabbitMQ, Azure Service Bus, Kafka, etc.)

What You'll Bring:

• A test-first, craft-focused engineering mindset
• Strong architectural instincts with a collaborative, debate-positive attitude
• Comfort with modern engineering workflows and continuous delivery

Why You’ll Love It:

• Interesting problems: Not just CRUD—think event sourcing at scale, complex routing logic, and fast data decisions
• Input into architecture: Every engineer contributes to system evolution
• Relaxed, mature setup: Flexible hours and a team of experienced professionals who value quality code
• Modern stack: Using cutting-edge tools in real-world applications