Senior.Net Engineer

About the Position

Senior.Net Engineer

Bucharest

Qualysoft, a leading software engineering company with 25 years of experience, is seeking a Senior.Net Engineer to join our team in Bucharest. We offer hybrid work options and a dynamic, innovative environment.

Responsibilities

• 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.

Requirements

• 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.

We Offer

• Premium medical package
• Lunch Tickets & Pluxee Card
• Bookster subscription
• 13th salary/yearly bonuses
• Enterprise job security with a startup mentality (diverse & engaging environment, international exposure, flat hierarchy) under the stability of a secure multinational
• A supportive culture (we value ownership, autonomy, and healthy work-life balance) with great colleagues, team events and activities
• Flexible working program and openness to remote work
• Collaborative mindset – employees shape their own benefits, tools, team events and internal practices
• Diverse opportunities in Software Development with international exposure
• Flexibility to choose projects aligned with your career path and technical goals
• Access to leading learning platforms, courses, and certifications (Pluralsight, Udemy, Microsoft, Google Cloud)
• Career growth & learning – mentorship programs, certifications, professional development opportunities, and above-market salary

About the Company

Qualysoft is a software engineering company with 25 years of experience, established in Vienna, Austria, and active in Romania since 2007. We deliver scalable enterprise systems, intelligent automation frameworks, and digital transformation platforms. Our cross-industry experience spans BSFI, Telecom, Retail & E-commerce, Energy and Utilities, Automotive, Manufacturing, Logistics, and High Tech. We have a global presence in Switzerland, Germany, Austria, Sweden, Hungary, Slovakia, Serbia, Romania, and Indonesia, with an international team of 500+ software engineers. We are powered by cutting-edge technologies: AI, Data & Analytics, Cloud, DevOps, IoT, and Test Automation. Our project beneficiaries range from large-scale enterprises to startups.

We are an equal opportunity employer and value diversity. All employment decisions are made without regard to age, gender, disability, race, ethnicity, religion, sexual orientation, or any other protected characteristic. We encourage applicants from all backgrounds to apply.

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.

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