Lead Full Stack Engineer (.NET + Angular)

We are seeking an experienced Lead Full Stack Engineer to join a high-impact, strategic technology initiative. Our mission is to evolve a core business application for a market-leading enterprise, proactively transforming the platform into a secure, maintainable, and high-performance architecture.

As the team's technical pillar, you will be responsible for guiding the hands-on transformation of a legacy stack (.NET Framework 4.5.2, Angular 6) into a modern, decoupled, API-driven architecture, building the foundation for future innovation and scale.

What You'll Do:

• Lead the hands-on architecture and development for the complete modernization of a flagship business application.
• Guide the backend migration from the legacy .NET Framework 4.5.2 to .NET 10. This includes replacing the OWIN-based hosting infrastructure with native ASP.NET Core middleware and refactoring code to remove System.Web dependencies (e.g., HttpContext, Session).
• Spearhead the complex frontend migration from Angular 6 to Angular 20. You will manage an incremental, version-by-version approach to mitigate risk, addressing numerous breaking changes and updating third-party libraries.
• Collaborate with the Solution Architect to implement and enforce a strict "API-first" decoupled architecture, ensuring a clean separation between the new SPA frontend and the .NET 10 backend.
• Address and resolve critical dependency challenges, replacing dozens of incompatible NuGet packages (e.g., Microsoft.Owin, Swashbuckle.Core, MySql.Data.Entity) and outdated JavaScript libraries.
• Work closely with the DevOps Engineer to build and optimize multi-stage CI/CD pipelines in Azure DevOps using YAML.
• Mentor and guide the team's Senior and Middle engineers, establishing best practices and ensuring code quality within the new architecture.
• Partner with the QA team to support the creation of the manual regression test suite and validate functionality during continuous in-sprint testing phases.

What We're Looking For:

• Extensive senior-level software engineering experience with a proven track record of leading complex technical modernization projects.
• Deep mastery of the .NET ecosystem, including experience with both legacy .NET Framework 4.x (particularly ASP.NET) and modern .NET Core / .NET 10.
• Expert-level Angular skills, specifically with demonstrable experience in complex migrations across multiple major versions (e.g., migrating from Angular 6 or similar).
• Experience architecting and migrating monolithic (tightly-coupled) applications to decoupled, API-driven Single Page Application (SPA) architectures.
• Solid hands-on experience with Azure DevOps, particularly building and managing YAML-based CI/CD pipelines.
• Proven experience with MySQL, including upgrading data access drivers (e.g., from MySql.Data to MySql.EntityFrameworkCore) and refactoring data access logic.
• Familiarity with the challenges of replacing legacy .NET components like System.Web, OWIN, and Microsoft.AspNet.WebApi.Core.
• Strong communication and collaboration skills to work effectively with multidisciplinary technical teams (DevOps, QA, DBAs) and manage project dependencies.
• Exceptional command of written and spoken English.

Why Join Us?

• Take the primary technical leadership role in a critical, high-impact modernization project.
• Solve complex technical challenges spanning deep framework migrations and a complete architectural transformation.
• Work with a dedicated, multidisciplinary team of architects, engineers, and QA specialists focused on a clear objective.
• See the direct results of your work as you transform a core application into a modern, secure, and high-performance platform.
• Be part of a quality first company, multiple options for getting new education and certifications.

We offer:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers