Senior .Net Engineer

About Qualysoft

· 25 years of experience in software engineering, established in Vienna, Austria · Active in Romania since 2007, with office in central Bucharest (Bd. Iancu de Hunedoara 54B) · Delivering End to End IT Consulting Services - From Team Augmentation and Dedicated Teams to Custom Software Development
· We deliver scalable enterprise systems, intelligent automation frameworks, and digital transformation platforms · Cross-industry experience by sustaining global players in BSFI (Banking, financial services and insurance), Telecom,Retail & E-commerce, Energy and Utilities, Automotive, Manufacturing, Logitics, High Tech · Global Presence: Switzerland, Germany, Austria, Sweden, Hungary, Slovakia, Serbia, Romania, and Indonesia · International team of 500+ software engineers · Strategic partnerships: Microsoft Cloud Certified Partner, Tricentis Solutions Partner in Test Automation and Test Management, Creatio Exclusive Partner, Doxee Implementation Partner · Powered by cutting-edge technologies: AI, Data & Analytics, Cloud, DevOps, IoT, and Test Automation. · Project beneficiaries ranging from large-scale enterprises to startups · Stable growth and revenue increase year over year, a resilient organisation in volatile IT market conditions · Quality-first mindset, culture of innovation, and long-term client partnerships · Global and local reach – trusted by key industry players in Europe and the US

• Design, develop, test, and maintain backend services and REST APIs using .NET, C#, and ASP.NET Core. • Contribute to backend architecture decisions with a focus on maintainability, security, and multi-tenancy. • Write efficient T-SQL queries and stored procedures in Microsoft SQL Server and improve query performance through appropriate indexing, in collaboration with the DBA team. • Implement data access using Entity Framework Core and/or Dapper. • Implement integrations with internal and external systems, including message-based communication (e.g. RabbitMQ). • Implement secure backend practices, including authentication, authorization, and role-based access. • Troubleshoot and resolve defects, performance issues, and production incidents. • Write and maintain unit and integration tests. • Lead code reviews and contribute to backend coding standards and best practices. • Participate in modernization and refactoring of existing services. • Use GitHub Copilot and other approved AI-assisted development tools to improve productivity, while ensuring code quality and correctness. • Mentor mid-level and junior developers and collaborate with Product, QA, DBA, and DevOps teams.

• At least 7 years of professional experience with C#, .NET / .NET Core, and ASP.NET Core. • Relevant hands-on experience with Microsoft SQL Server as a relational database. • Ability to write complex T-SQL queries, including the use of CTEs and temporary tables. • Knowledge of indexing strategies and the ability to read an execution plan to identify slow queries. • Experience with Entity Framework Core and/or Dapper. • Experience designing and consuming REST APIs. • Experience with asynchronous programming and message-based integrations (e.g. RabbitMQ). • Good knowledge of object-oriented programming, SOLID principles, design patterns, and clean code. • Good understanding of web application security, authentication, authorization, and role-based access. • Practical experience using GitHub Copilot or similar AI-assisted development tools, while maintaining responsibility for code quality and correctness. • Experience with Git, code reviews, unit testing, and CI/CD pipelines (Azure DevOps preferred). • Good communication, collaboration, and mentoring skills