Senior Backend Engineer / Architect (.NET / Distributed Systems)

Senior Backend Engineer / Architect (.NET / Distributed Systems)

Cork (Hybrid)
€120k-€140k DOE

We're partnering with a scaling SaaS company building a high-throughput platform in a complex financial technology domain.

They're entering a major growth phase and need a very senior backend engineer who has already operated inside large-scale SaaS/platform environments where scalability, system behaviour, reliability, and production performance are constant challenges.

This is not a standard feature-delivery role.

They want someone who can step into a complex distributed system, understand how it behaves under load, identify weaknesses early, and help shape the long-term technical direction of the platform.

What You'll Be Doing



Platform & Systems Engineering

• Design and evolve distributed backend systems in C# / .NET
• Improve scalability, resilience, performance, and operational reliability
• Analyse production behaviour across services, messaging, APIs, and databases
• Prevent bottlenecks, data growth issues, and architectural drift before they become problems
• Drive long-term engineering improvements rather than short-term fixes
  
  

Architecture & Technical Leadership

• Influence architecture and engineering direction across multiple teams
• Review designs and challenge technical decisions where needed
• Help establish patterns for building scalable, production-ready systems
• Mentor engineers around debugging, distributed systems thinking, and reliability
  
  

Production & Scalability

• Troubleshoot complex production issues across distributed services
• Improve observability, diagnostics, logging, and system monitoring
• Work closely with engineering leadership on system-wide technical priorities
• Balance delivery speed with long-term platform health
  
  

Hands-On Engineering

You'll still be close to the code and involved in:

• C# / .NET backend services
• Distributed/event-driven systems
• CQRS and asynchronous workflows
• Multi-tenant SaaS architecture
• CI/CD and cloud-native environments
  
  

What They're Looking For

• Strong experience building large-scale backend systems in C# / .NET
• Background working in scaling SaaS or platform engineering environments
• Deep understanding of distributed systems and real-world production behaviour
• Strong experience with:
  • scalability and performance optimisation
  • concurrency and consistency
  • retries, idempotency, and failure handling
  • debugging complex production issues
• Comfortable operating at Staff/Principal/Architect level
• Someone who brings ideas, improves systems, and raises engineering standards
  
  

Tech Environment

• .NET / C#
• Distributed systems
• CQRS / event-driven architecture
• MongoDB, Azure SQL, Elasticsearch
• Kubernetes / CI/CD
• Akka.NET experience beneficial
  

Desired Skills and Experience

Senior backend engineer with strong C#/.NET experience, proven track record designing distributed/event-driven systems, and a hands-on approach to solving complex production and scalability challenges.