We are looking for a Senior .NET Developer to join a high-scale smart-shopping and cashback platform serving millions of users. The role focuses on building and optimising backend services supporting cashback, loyalty, affiliate, and e-commerce functionalities within a modern Azure-based microservices environment.

This is a hands-on backend engineering role requiring strong experience with .NET, Azure Cloud, REST APIs, and scalable distributed systems operating in a high-traffic production environment.

Responsibilities:

• Develop and maintain backend services using .NET 8 and C#
  
• Design and build RESTful APIs and microservices for high-traffic use cases
  
• Integrate systems with third-party APIs and data providers
  
• Work with Azure cloud services (App Services, Azure Functions, AKS, Blob Storage, Cosmos DB, etc.)
  
• Implement unit and integration tests to ensure code quality and reliability
  
• Work with Azure DevOps, Docker, and Git for CI/CD and version control
  
• Collaborate with DevOps to optimise deployment pipelines and infrastructure
  
• Participate in code reviews, architecture decisions, and sprint planning
  
• Maintain documentation of backend architecture and API specifications
  

Requirements

• Minimum 4–5 years of experience in backend development with C# and .NET (latest version .NET 8 preferred)
  
• Proven experience designing scalable and secure REST APIs
  
• Strong knowledge of Azure Cloud and microservices architecture
  
• Experience with SQL (MS SQL Server, PostgreSQL) and ORM tools such as Entity Framework Core or Dapper
  
• Familiarity with Azure DevOps, Docker containers, Git, and CI/CD pipelines
  
• Good understanding of application security, error handling, and performance optimisation
  
• Ability to work in Agile/Scrum teams and communicate with business and technical stakeholders
  

• Experience with e-commerce, affiliate marketing, or cashback platforms
  
• Exposure to NoSQL solutions like Cosmos DB or MongoDB
  
• Experience with Event-Driven Architecture, e.g. Azure Event Grid or Kafka
  
• Familiarity with front-end technologies (React, Angular) for collaboration purposes
  

Benefits

• Solid, competitive salary
  
• Work in a multinational environment on international projects
  
• Comprehensive healthcare
  
• Long-term B2B contract with a stable project pipeline
  
• Work model: fully remote (1-2 times/month in Warsaw)
  
• Work on a large-scale, high-impact product with strong market presence
  
• Be part of a modern .NET development environment in a cloud-first organisation
  
• Collaborate in a stable, secure fintech setting with the speed of a startup
  
• Enjoy flexible working and ownership of your development responsibilities