.NET developer

Wiser Technology designs, builds, and scales complex software systems that power real-world impact. With 500+ engineers and over 25 years of experience in mission-critical environments, we help global organizations turn ambitious ideas into working solutions. Across Europe, MENA, and North America, we combine deep engineering expertise with AI and data to support leading companies in aerospace & defense, automotive, telecom & media, IT, and financial services.

WHAT YOU WILL DO:

• At least three years of commercial experience in C# and .NET

• Hands-on experience with both .NET Framework (4.x) and modern .NET (8+), and an understanding of what changes when you move code between them

• Strong SQL skills with SQL Server: writing and reading stored procedures, T-SQL, indexes, transactions and locking

• Experience with ADO.NET data access (SqlClient, DataSets, parameterised queries), not only Entity Framework

• Experience building and consuming web services, both SOAP/WCF and RESTful APIs in ASP.NET Core Web API

• Experience with background processing: Windows Services, scheduled jobs or workers, and the concurrency problems they bring (multiple instances, idempotency)

• Solid object-oriented design and familiarity with Dependency Injection and async patterns

• Ability to write unit-testable code, and experience writing unit and integration tests (xUnit/NUnit/MSTest)

• Working knowledge of Git and pull-request-based workflows

• Experience using AI coding assistants (GitHub Copilot, Claude Code or similar), and the discipline to review and verify what they produce

• NICE TO HAVE:

• PostgreSQL experience, especially migrating schema or T-SQL from SQL Server to PostgreSQL

• Microsoft Azure: App Service, Azure Functions, Key Vault, managed identity, Azure Database for PostgreSQL

• Setting up CI/CD pipelines (GitHub Actions or Azure DevOps) with build and test gates

• Characterization, regression, or contract testing on legacy systems

• Multi-tenant application design, row-level security, or role-based access control

• Some exposure to WPF/XAML or a modern web front end (React, Angular)

• Experience in transport, logistics, or other operational/ERP domains

SOFT SKILLS & ATTRIBUTES:

• Fluent English, spoken and written. You will work daily with the client's UK-based team

• Comfortable reading and changing large, unfamiliar legacy code without rewriting what already works

• Careful and methodical with production data, credentials and anything security-related

• Able to follow a specification, and to raise it when the code tells a different story from the spec

• Works well inside a mixed Wiser and client team and communicates progress and blockers early

• Willing to learn and share knowledge within the team

WHAT'S IN IT FOR YOU?

Culture & Development:

• Friendly Environment: We take pride in our culture and love spending time together.

• Team Spirit: Be part of a supportive team that uplifts each other.

• Mentorship and coaching: Our colleagues are experts in their field, and you can expect to have a solid team to rely on.

• Personalized Development Program: We realize that one size doesn't fit all, so you'll receive an individual development plan tailored to your career aspirations.

Social Benefits:

• Work Flexibility: Embrace flexible working hours and choose from remote, hybrid, or onsite work models.

• Multiple Office Locations: In Sofia, Plovdiv, Stara Zagora, and Nis, you can choose where you would like to work.

• A Suite of Perks: Enjoy food vouchers, additional health insurance, and more.
  Community and Connections: Engage in exciting social events and team initiatives.

Ready to advance your career with a tech leader passionately driven by innovation?

Wiser, We Have The Code®