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