About the role:

We are looking for an experienced developer to join us in one of two ongoing projects within ista:

• Project A – .NET-focused
  Development and maintenance of a work planning web application used by hundreds of users.
• Project B – SQL / Data-focused
  Supporting and evolving a data-heavy system with strong emphasis on SQL Server querying, performance, and operational stability.

One role, one recruitment process – the project assignment will depend on your strengths and experience.

Tech Stack:

• Backend: .NET, .NET Core, C#
• Frontend: JavaScript / TypeScript, HTML, CSS (project-dependent)
• Databases: SQL Server (T-SQL, Stored Procedures)
• Tools & Processes: Git, CI/CD, Agile/Scrum, REST APIs
• Other: Legacy systems, code quality tools, testing frameworks

What you will do:

Depending on the project, you will:

Project A – .NET-oriented

• Implement new features in a web application
• Participate in the full development lifecycle (analysis → design → implementation)
• Maintain and refactor legacy code
• Ensure high code quality and alignment with standards
• Collaborate closely with other developers (incl. .NET & PHP teams)

Project B – SQL-oriented

• Write advanced ad-hoc T-SQL queries
• Create, deploy and optimize stored procedures
• Perform performance tuning and query optimisation
• Support day-to-day SQL Server operations: 
  • user creation
  • permissions
  • SQL Server Agent jobs
• Work with large, complex databases (100+ tables / procedures)

Must-have:

• 5+ years of professional experience as a developer
• Very strong SQL Server skills (T-SQL, performance optimisation)
• Solid experience in .NET / C# or strong motivation to deepen it
• Experience with web applications
• Analytical, solution-oriented mindset
• Strong communication skills and team attitude
• English B2+
• Openness to working in an international environment

Nice to have:

• SSIS (deployment, maintenance, package creation)
• BI / Data Warehousing experience
• Experience with legacy systems
• Knowledge of frontend frameworks
• Familiarity with CI/CD pipelines

Why join ista?

• International environment with flat hierarchies
• Real influence on system development and technical direction
• Hybrid work model and flexible arrangements
• Certified trainings, e-learning platforms
• IT conferences (local & international)
• Language courses and platforms
• Private medical care, group insurance
• Sports card
• In-office massage sessions
• Team integration budgets
• Modern office in Gliwice with private parking