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.
- 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.
- 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
Top Skills
What We Do
N-iX is a global software solutions and engineering services company that helps world’s leading organizations turn challenges into lasting business value, operational efficiency, and revenue growth using advanced technology. Whether you need to build a custom solution, modernize your digital product or acquire extra tech expertise - we have the experience and capabilities to ensure your success.
With over 2,000 professionals in 25 countries across Europe and the Americas, N-iX offers expert solutions in cloud, data analytics, embedded software, IoT, AI, machine learning, and other tech domains. Being in business for over two decades, we have worked with dozens of industry-leading enterprises and Fortune 500 companies creating value across a wide variety of sectors, including finance, manufacturing, supply chain, retail, e-commerce, healthcare, and more. Our unique combination of business domain expertise and technical know-how enables us to effectively collaborate with ISVs, tech companies, and enterprises of all sizes. Thanks to the strong tech ecosystem and partnerships with AWS, GCP, Microsoft, SAP, OpenText, Snowflake, and others, we bring extra speed, scale and efficiency to more than 160 organizations across the globe. N-iX is recognized by numerous industry awards, such as CRN Solution Provider 500, Global Outsourcing 100 by IAOP, ISG Provider Lens™, Modern Application Development services providers by Forrester, etc
