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September 16, 2026
Senior .NET Integration Developer
Senior • On-site
Warsaw, Poland
Apply now
Quick Facts
Role: Senior .NET Integration Developer
Description
You will design, develop, and maintain enterprise applications and API-based integrations supporting HR, Payroll, and Finance systems. You will build scalable, secure APIs and services integrating internal applications, SaaS platforms, and external systems using C# and .NET. You will also work on platform modernization and improve resiliency, scalability, performance, automation, and operational efficiency.
Responsibilities
Design, develop, and maintain enterprise applications and API-based integrations (HR, Payroll, Finance)
Build REST APIs and services for integrations with internal systems, SaaS, and external platforms
Develop backend solutions in C# and .NET focused on enterprise application integration
Work with SQL and relational databases (data modeling, query optimization, performance tuning, troubleshooting)
Translate business and technology requirements into robust technical solutions
Contribute to architecture and modernization, including legacy-to-cloud migration
Improve resiliency, scalability, performance, automation, and operational efficiency
Collaborate with DevOps on production issues, CI/CD pipelines, and DevOps practices
Participate in automated testing, code reviews, and continuous delivery
Improve integrations and applications using modern technologies and AI-assisted development tools
Requirements
6+ years of professional software development experience (enterprise/business-critical preferred)
Strong hands-on experience with C# and .NET
Strong SQL and relational database skills, including data modeling, query optimization, and debugging
Proven experience designing and developing REST APIs, web services, and system integrations
Experience integrating enterprise applications, SaaS platforms, and external systems
Experience with automated testing, source control, code reviews, and CI/CD
Working knowledge of cloud environments and distributed systems
Experience supporting production applications and resolving complex technical issues
Strong analytical and problem-solving skills
Good communication skills and ability to work with business stakeholders and technology teams
Benefits
Not specified in the provided posting.
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