Senior .NET Back-end Developer (Legacy Platform)

Experience and Skills

• Senior backend developer with 5+ years of recent C# and .NET experience, including hands-on .NET Framework experience.
• C1 English level or higher, with confidence in daily spoken communication.
• Strong experience with Dapper and Entity Framework, including sound judgment on when to use each.
• Strong SQL skills and production performance troubleshooting experience.
• AWS experience.
• Ability to understand, modify, and maintain large, non-modular legacy codebases safely.
• Hands-on experience with Production Troubleshooting, Legacy Code Maintenance.

Skills

• C#
• Dapper
• Entity Framework
• SQL
• AWS
• Production Troubleshooting
• Legacy Code Maintenance

Key Responsibilities

• Maintain and extend a large, mature .NET Framework backend while preserving system stability.
• Diagnose and resolve production incidents, prioritizing critical issues during tax season.
• Optimize SQL queries and data access using Dapper and Entity Framework.
• Analyze legacy, non-modular code and implement safe, incremental changes.
• Collaborate daily with the legacy team lead and engineers in English.
• Monitor reliability and performance, and contribute to practical improvements across the platform.

Benefits

We provide the opportunity to participate in impactful and technically rigorous industrial data projects that drive innovation and professional growth. Our work environment emphasizes technical excellence, collaboration, and continuous innovation.

Niuro supports a 100% remote work model, allowing flexibility in work location globally. We invest in career development through ongoing training programs and leadership opportunities, ensuring continuous growth and success.

Upon successful completion of the initial contract, there is potential for long-term collaboration and stable, full-time employment, reflecting our long-term commitment to our team members.

Joining Niuro means becoming part of a global community dedicated to technological excellence and benefiting from a strong administrative support infrastructure that enables you to focus on impactful work without distraction.

Nice to Have

• Regulated Environments
• Tax Software
• Fintech
• Banking
• Healthcare
• Claude Code

We are seeking a Senior .NET Backend Developer to maintain, stabilize, and evolve a mature legacy platform supporting US tax preparation software. This is a hands-on individual contributor role working with sensitive taxpayer data in a regulated environment. You will maintain a large .NET Framework codebase, resolve production incidents, optimize data access, and deliver safe incremental improvements. You will work closely with legacy platform engineers in English and take ownership of reliable delivery, especially during tax season.