.NET Developer

We’re looking for a .NET Developer to join the team developing and evolving an internal corporate HR system, with opportunities to work on new functionality, integrations, and modernization of the platform.

About Us

Kyivstar.Tech is a Ukrainian hybrid IT company and a resident of Diia.City. We are a subsidiary of Kyivstar, one of Ukraine's largest telecom operators.

Our mission is to change lives in Ukraine and around the world by creating technological solutions and products that unleash the potential of businesses and meet users' needs.

Over 600+ KS.Tech specialists work daily in various areas: mobile and web solutions, as well as design, development, support, and technical maintenance of high-performance systems and services.

We believe in innovations that truly bring quality changes and constantly challenge conventional approaches and solutions. Each of us is an adherent of entrepreneurial culture, which allows us never to stop, to evolve, and to create something new.

What You Will Do

• Develop and enhance functionality of an internal corporate HR system.
• Analyze and safely modify existing legacy .NET code, XML configurations, XSLT transformations, and generated components.
• Investigate existing subsystems and reconstruct their logic based on code, data structures, and system behavior.
• Clarify requirements with business stakeholders and translate business needs into technical solutions, specifications, and development tasks.
• Develop algorithms, modules, and integrations with internal corporate systems and external services.
• Work with SQL databases, ORM, SSRS, IIS and related infrastructure components.
• Diagnose issues across the application, IIS, database, integrations, Office, and operating system.
• Contribute to the gradual modernization of the legacy system and migration to a modern .NET stack.
• Create technical documentation and, when needed, provide guidance to users, developers, and administrators.
  
  

Qualifications And Experience Needed

• 2+ years of commercial experience developing enterprise solutions with C# and .NET Framework.
• Strong understanding of OOP, design patterns, and separation of responsibilities.
• Hands-on experience working with legacy .NET Framework code and willingness to work with older approaches and APIs.
• Ability to read, analyze, and safely modify unfamiliar legacy code.
• Practical experience with ASP.NET Web Forms and understanding of the web application lifecycle.
• Strong SQL skills and understanding of relational databases, indexes, transactions, and query optimization.
• Practical experience with XML, XSD, XML validation, and XSLT.
• Understanding of ORM principles and experience with NHibernate, Entity Framework, or a similar technology.
• Experience with Microsoft IIS and troubleshooting ASP.NET application deployment and runtime issues.
• Experience integrating systems via REST API, SOAP, or web services; understanding of HTTP, authorization, data formats, TLS, and certificates.
• Experience with Git, basic MSBuild, and understanding of CI/CD and the software development lifecycle.
• Experience with Jira and Confluence and ability to document technical solutions and changes.
• Ability to clarify requirements with business stakeholders and translate business needs into technical tasks.
• Strong communication skills and ability to collaborate with developers, administrators, analysts, and business stakeholders.
• Higher technical education, preferably in Computer Science, Software Engineering, or IT
  
  

A plus would be

• Experience with NHibernate, SSRS, XML/XSLT code generation.
• Experience generating Excel/Word documents without COM.
• Knowledge of modern .NET, ASP.NET Core, EF Core, or Dapper.
• Experience with React, message brokers, and automated testing.
• Experience with legacy system modernization, gradual refactoring, and migration to modern technologies.
• Experience working with large-scale enterprise or corporate systems.
  
  

What We Offer

• Office or remote — it's up to you.
• Remote onboarding.
• Performance bonuses for everyone (annual or quarterly — depends on the role).
• We train employees: the opportunity to learn through the company’s own library, internal resources and programs from partners.
• Health and life insurance.
• Wellbeing program and corporate psychologist.
• Reimbursement of expenses for Kyivstar mobile communication.
  
  

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.