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Backend .NET Developer

MADIFF Polska · Warsaw, Masovian Voivodeship, Poland

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Backend .NET Developer at MADIFF Polska. We’ll keep it in your applied jobs, so you can see it later and be warned before applying to the same employer twice.

We are looking for a Senior Backend .NET Developer to join a product team responsible for developing and maintaining a large-scale digital platform. The role focuses on building and enhancing backend services using .NET Core and microservices, optimising databases, integrating with external partners, and delivering scalable, high-quality solutions in a modern Agile environment.

Responsibilities

  • Design and implement new backend functionalities in .NET Core
  • Develop and maintain microservices
  • Integrate backend services with external partners
  • Implement and develop content search capabilities
  • Create and optimise database queries in SQL Server and Cosmos DB
  • Participate in requirement analysis, backlog refinements and sprint planning
  • Maintain code quality through unit testing and code reviews
  • Follow backend engineering best practices
  • Support API documentation and technical documentation where needed

Requirements

  • Minimum 5 years of commercial backend development experience
  • Strong .NET Core and C# experience
  • Experience creating and optimising queries in SQL Server
  • Experience with microservices architecture
  • Experience with messaging systems such as Azure Service Bus, Event Hub, Kafka or MQ
  • Experience working in Agile delivery teams
  • Ability to analyse requirements and work with Product Owners
  • English at a level enabling business communication

Nice to have

  • Experience with search engines, preferably Azure AI Search, or alternatives such as ElasticSearch
  • Experience with Azure Cosmos DB or other NoSQL databases such as MongoDB
  • Experience building cloud applications in Azure
  • Experience with App Services, Azure Functions, Storage, Application Insights or Log Analytics
  • Experience creating API documentation using Swagger or OpenAPI
  • Experience building backend services for mobile applications
  • Degree in Computer Science, Engineering, Mathematics, Physics or similar

Benefits

  • Solid, competitive salary
  • Work in a multinational environment on international projects
  • Comprehensive healthcare
  • Long-term B2B contract with a stable project pipeline

Skills

  • .NET
  • .NET Core
  • SQL Server
  • Cosmos DB
  • C#
  • Azure Service Bus
  • Kafka
  • Azure AI Search
  • Elasticsearch
  • MongoDB
  • Azure
  • Azure App Service
  • Azure Functions
  • Azure Application Insights
  • Azure Log Analytics
  • Swagger
  • OpenAPI

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