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September 16, 2026

Senior .NET Integration Developer

Senior • On-site

Warsaw, Poland

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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