Lead .Net Full-Stack Engineer (with Angular or React)

N-iX is looking for a Lead .Net Full-Stack Engineer with Angular or React to join a dedicated delivery team working on a high-visibility engagement with a US-based payments technology company undergoing a strategic carve-out into a standalone business entity.

• Remediate security findings across ASP.NET applications (MVC, Web API, Razor Pages), including issues related to secrets management, cryptography, token handling, injection vulnerabilities, and sensitive-data logging.
• Upgrade legacy .NET Framework applications to supported versions and migrate components to .NET 6+/8 where feasible.
• Modernize and stabilize frontend dependencies across Angular, React, TypeScript, and Telerik/Kendo UI codebases.
• Investigate and reverse-engineer brownfield systems, including legacy components, to understand data flows and payment-processing logic.
• Collaborate closely with the client’s retained engineering team, working effectively even in areas with limited documentation or SME coverage.
• Contribute to validation and retest activities by preparing evidence packages, deployment logs, and before/after remediation artifacts.
• Support CI/CD-driven delivery and ensure changes are shipped with appropriate testing, QA validation, and rollback procedures.
• Participate in technical discussions around future platform modernization and integration initiatives.

• 6+ years of professional experience in .NET development on large-scale production systems.
• Strong expertise in C# and ASP.NET (MVC, Web API, Razor Pages).
• Hands-on experience working with both .NET Framework 4.5.x-era applications and .NET 6+/8 modernization or migration efforts.
• Solid experience with Entity Framework / EF Core.
• Strong frontend skills with Angular, React, and TypeScript.
• Proven experience working on brownfield or legacy modernization projects.
• Practical experience remediating security vulnerabilities and applying secure coding practices (OWASP-related issues, secrets handling, cryptography, authentication/session management).
• Ability to work independently in complex, partially documented environments.
• Upper-Intermediate English (B2+) or higher.

• 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