Salary
≈ $57k – $95k per year (Estimated)
Location
In office (Warsaw)
Seniority
Senior · 5+ years exp
Employment
Full-Time
Confirmed on the employer's own hiring board on Oct 11, 2026. First seen by Alion on Oct 10, 2026.
Overview
Company
Impact
Profile match
Madiff is an IT consulting and staff augmentation company that provides remote agile teams, nearshore development teams and individual IT contractors to enterprise clients, with most of its hiring run from Warsaw. It works across retail, banking and insurance, telecom and media, automotive, energy, transportation and life sciences, recruits consultants in Poland and Portugal and sells its services into the UK, Ireland, France, Switzerland, Northern Europe and the US. Its openings cover .NET and full stack developers, data engineers and data scientists, AI architects, system and business analysts, QA testers, project managers and IT sales staff.
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 inSQL Server andCosmos 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 andC# experience
- Experience creating and optimising queries inSQL Server
- Experience with microservices architecture
- Experience with messaging systems such asAzure Service Bus,Event Hub,Kafka orMQ
- 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, preferablyAzure AI Search, or alternatives such asElasticSearch
- Experience withAzure Cosmos DB or other NoSQL databases such as MongoDB
- Experience building cloud applications inAzure
- Experience withApp Services,Azure Functions,Storage,Application Insights orLog Analytics
- Experience creating API documentation usingSwagger 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
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