ELEKS Software Engineering and Development Office  is looking for a Senior/ Team Lead .NET Developer in Poland.   ABOUT PROJECT We are building a web portal for the automation of insurance processes in the Healthcare domain. ELEKS has been collaborating with the client for more than 5 years. Currently, it is one of the biggest accounts within the Business Unit. The team consists of approximately 25 specialists located in Poland and Ukraine. There are currently 8 development teams involved in the project (7 on the customer side and 1 on the ELEKS side). The ELEKS team is primarily focused on developing new functionality and product enhancements. REQUIREMENTS At least 5 years of commercial experience in software development Strong commercial experience with C#, .NET 8+ and modern development practices Experience with Entity Framework Strong knowledge of Microsoft SQL Server Experience with Microsoft Azure (Azure Service Bus) Experience developing RESTful APIs Experience working with Azure Service Bus Knowledge of unit testing and xUnit Upper-Intermediate or higher level of English FOR TEAM LEAD ADDITIONALLY * Experience leading or mentoring engineers * Experience making technical decisions and driving implementation approaches * Ability to coordinate development activities and support the team * Experience taking ownership of technical solutions and delivery NICE TO HAVE * Experience in Healthcare or Insurance domains * Experience with AI-assisted development tools such as Windsurf RESPONSIBILITIES * Develop and enhance new functionality for the platform * Design and implement scalable backend services * Participate in architecture and technical discussions * Write clean, maintainable, and testable code * Collaborate with distributed teams across the project FOR TEAM LEAD ADDITIONALLY * Drive technical decisions and implementation strategy * Mentor and support team members * Ensure engineering best practices and code quality standards * Participate in planning, estimation, and coordination activities * Collaborate closely with stakeholders and other development teams