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

JR United Kingdom; Watford; On-site; GBP 50,000 - 80,000; Full time

Job summary

A leading technology company in Watford is seeking a highly skilled Server-Side C# Engineer to join a senior-led engineering team. You will tackle complex delivery challenges while influencing system architecture. Enjoy flexible hours, a collaborative culture, and opportunities to work with modern technologies in a relaxed environment.

Benefits

Flexible hours

Collaborative team environment

Opportunities for professional development

Use of cutting-edge technologies in real applications

Qualifications

• Approximately 8 years commercial server-side experience.
• Experience with multiple codebases and domains.
• Commercial experience in implementing Event Sourcing and DDD.

Responsibilities

• Develop and maintain a greenfield microservices platform.
• Mentor and train other engineers, providing hands-on leadership.
• Contribute to architectural direction and modern engineering workflows.

Skills

C#/.NET

Event Sourcing

DDD

Messaging Tech

Mentoring

Job description

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

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

They are seeking a highly skilled server-side C# engineer to join their lean, senior-led engineering team—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
• This role involves mentoring and training other engineers—providing hands-on leadership
• Event Sourcing & DDD: 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 is involved in shaping how the system evolves
• Relaxed, mature setup: Flexible hours and a team of experienced professionals who value great code
• Modern stack: Use of cutting-edge tools in real-world applications, not just theory