YOU SHOULD HAVE

• 5+ years’ experience in .NET development, with deep exposure to ASP.NET (Web Forms and MVC) and ideally classic ASP
• Strong C# and T-SQL skills, including work on large monolithic codebases
• Comfort navigating and improving legacy enterprise systems
• Experience writing tests around legacy behavior to protect stability during change
• Solid experience with MSSQL Server tuning, including indexing, query optimisation, and performance diagnostics
• Track record of refactoring long-lived stored procedures with care
• A collaborative mindset and strong communication skills

ABOUT THE ROLE

We’re seeking a Senior .NET Developer who knows that modernising a legacy system starts with respect, patience, and smart engineering.
You’ll work on a business-critical payments platform built using ASP, ASP.NET, and SQL Server, with the goal of improving its reliability, performance, and maintainability while continuing to support ongoing business needs. This isn’t a greenfield role . it’s about stabilising and extending a large, mature system that still powers meaningful real-world operations.

WHAT YOU’LL DO

• Work hands-on with legacy ASP and ASP.NET code, identifying safe ways to extend or refactor functionality
• Write tests around existing behaviour before making changes
• Review current code, and new code developed by team members.
• Improve system performance, stability, and maintainability through targeted enhancements
• Refactor large, tightly-coupled stored procedures, improving clarity and modularity
• Tune MSSQL Server performance across queries, indexes, and configuration
• Document architectural decisions and “known quirks” to help bring the rest of the team up to speed
• Mentor and guide junior and mid-level engineers, helping them build confidence in working within complex systems and learning modern .NET.
• Collaborate with QA, Product, and Operations to ensure smooth delivery with minimal production risk

This role is ideal for someone who:

• Enjoys bringing order to complexity
• Sees legacy not as a burden, but as an opportunity to stabilise, clarify, and modernise
• Believes in safe progress, not heroic rewrites
• Takes pride in leaving codebases better than they found them
• Has the patience to mentor others through tricky terrai