Senior Staff Backend Engineer (C# / .NET)

Senior Staff Backend Engineer (C# / .NET)
Location: Cork (Hybrid
Salary : 110k - 130k DOE

Our client, a growing software company operating in the financial/legal technology space, is building a modern SaaS platform to support complex financial operations.
They are hiring a Staff Backend Engineer to act as a senior technical leader across their European engineering teams. This is a hands-on role with a strong focus on system design, architecture, and production reliability rather than just feature delivery.
You'll work closely with engineering leadership to ensure systems are scalable, stable, and well-designed, while supporting multiple teams and influencing technical direction.

Technical Leadership

• Act as a senior technical point of contact across European teams
• Guide architecture and ensure alignment with overall technical direction
• Review designs and challenge decisions to maintain system quality

System Design & Architecture

• Shape backend architecture in a distributed, event-driven environment
• Ensure systems are designed with:
  • Multiple entry points (APIs, integrations, async processes)
  • Strong data consistency and lifecycle management
  • Clear handling of failures and recovery

Production & Performance

• Investigate complex production issues across services and data layers
• Identify root causes of performance or scaling issues
• Drive long-term fixes rather than short-term patches

Engineering Standards

• Promote high standards in code and design reviews
• Support and mentor engineers on debugging, system thinking, and reliability
• Establish best practices for building scalable systems

Cross-Team Collaboration

• Work across multiple teams to maintain consistency in architecture
• Identify risks early and prevent technical issues before they arise
• Partner with engineering managers to balance delivery and quality

Hands-On Development

• Contribute directly to backend development when needed
• Work with technologies including:
  • C# / .NET
  • Event-driven architecture (CQRS / event sourcing)
  • Akka.NET (actor model)
  • MongoDB, Azure SQL, Elasticsearch
    
    

• Maintain system reliability, scalability, and data integrity
• Ensure consistent architecture across teams
• Prevent design drift and technical inconsistencies
• Lead resolution of complex system-wide issues
  
  

Technical Experience

• Strong background in C# / .NET backend development
• Experience building and supporting distributed systems
• Familiarity with Kubernetes and CI/CD pipelines

System Design Knowledge

• Understanding of:
  • Data flow across services
  • Concurrency and consistency
  • Idempotency and retries
  • Failure handling in distributed systems

Production Experience

• Proven ability to troubleshoot complex live issues
• Experience improving system performance and scalability
• Strong root cause analysis skills

Leadership

• Ability to influence multiple teams without formal authority
• Comfortable challenging technical decisions when needed
• Experience working at a senior or staff engineering level

Approach

• Strong ownership mindset
• Practical and solution-focused
• Clear and structured problem solving
  
  

• Experience with Akka.NET or actor-based systems
• Exposure to multi-tenant SaaS platforms
  
  

• Improved system design consistency across teams
• Faster resolution of production issues
• Stronger engineering standards and practices
• Increased system stability and scalability
• Better delivery speed through reduced rework
  
  

• Collaborative, cross-functional teams
• Strong focus on code quality, testing, and automation
• Modern CI/CD practices with frequent releases
• Engineers involved across the full lifecycle (design ? production)