Senior .Net Engineer Job San Diego area,California USA,Software Development

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, Dev Ops, 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

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 Git Hub 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 Dev Ops teams.

Qualifications

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 Git Hub 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 Dev Ops preferred).
Good communication, collaboration, and mentoring skills

What We Offer