Senior .NET Software Engineer

About the role

We are looking for a senior engineer to maintain, extend, and modernize a high‑volume e‑commerce platform that processes thousands of orders daily across Amazon and other marketplaces. You will work in an AI‑augmented team where Claude Code and other coding assistants are part of the daily workflow.

Key responsibilities

• Design, build, and maintain backend services and web applications using C# and .NET.
• Develop and extend integrations with Amazon and other marketplace APIs (orders, inventory, listings, fulfillment).
• Maintain and improve high‑volume order‑processing and data pipelines.
• Modernize legacy .NET Framework components to modern .NET where appropriate.
• Work with MS SQL Server and MySQL on schema design, query optimisation and performance tuning.
• Write automated tests and uphold a high bar for code quality.

Required profile

• 5+ years of professional .NET development experience.
• Strong C# skills across both legacy .NET Framework and modern .NET (ASP.NET Core).
• Solid experience with MS SQL Server and MySQL.
• Experience integrating third‑party APIs; e‑commerce or marketplace background is a plus.
• Daily use of AI coding tools such as Claude Code, Codex or Cursor.
• Bachelor’s degree in Computer Science or equivalent experience.

Required skills

• C#
• .NET Framework
• ASP.NET Core
• MS SQL Server
• MySQL
• Amazon Marketplace API integration
• AI‑assisted coding tools (Claude Code, Codex, Cursor)

What we offer

• Real‑scale environment handling thousands of orders daily.
• Opportunity to work on a 20‑year‑old platform with both legacy and modern code.
• Small senior team with no bureaucracy.
• Modern AI‑first workflow.
• Fully remote, long‑term full‑time engagement.