Description
The client requires occasional on-site work at its premises in Warsaw, Poland, for enterprise-level web applications in a complex IT environment.
Responsibilities
•Design, develop, and maintain enterprise web applications using C#, ASP.NET Core / .NET 8, Entity Framework, and SQL Server
•Develop responsive single-page applications using React and TypeScript
•Translate functional and business requirements into technical designs, using UML where appropriate
•Design and implement application components across data, business logic, and presentation layers
•Optimize application performance, security, reliability, and maintainability
•Contribute to software integration, prototyping, testing, and quality assurance
•Provide technical guidance to development teams and promote best practices and coding standards
•Participate in Agile/Scrum activities, technical planning, and effort estimation
•Conduct code reviews, identify technical debt, and propose improvements
•Produce and maintain technical documentation, solution designs, and development specifications
•Collaborate with external development partners on knowledge transfer, application handover, and technical continuity
•Manage application builds, deployments, and releases using Azure DevOps Pipelines
•Support application deployment and operations across Windows/IIS, virtualized, and containerized environments, including Nutanix or OpenShift
•Implement and maintain background-processing services using frameworks such as Hangfire
•Support application security mechanisms, including ASP.NET Core Data Protection, certificate management, and identity federation
•Address vulnerabilities identified through security scanning, including Checkmarx, and penetration testing
•Integrate enterprise applications with authentication and identity-management solutions, including SAML 2.0 and Microsoft Entra ID
•Develop and maintain integrations involving document-management systems, PDF generation, and image-processing technologies
•Provide second- and third-line application support, including incident investigation, troubleshooting, and root-cause analysis
•Support user acceptance testing (UAT), change management, and release coordination through governance processes, including Change Advisory Boards (CAB)
•Work with third-party contractors during application transition and support periods to ensure operational stability and continuity
Requirements
•At least 8 years of experience in IT, including at least 6 years using the mentioned tools
•UML certification
•Certification in software development related to .NET/Microsoft technologies, such as Azure or C#
•Strong professional experience developing and supporting enterprise applications using C#, ASP.NET Core / .NET 8, and Entity Framework
•Front-end development experience with React and TypeScript
•Knowledge of SQL Server, database design, and application data management
•Hands-on experience with Azure DevOps, CI/CD pipelines, and application release processes
•Understanding of multi-tier application architecture, object-oriented design, and UML modelling
•Experience in Agile/Scrum environments
•Familiarity with application hosting and deployment on Windows/IIS and containerized or virtualized infrastructure
•Experience with enterprise authentication, application security, and secure development practices
•Ability to support production applications and resolve complex technical issues
Conditions
•Contract employment
