.NET Full stack Developer

**Mandatory Skills** We are looking for a Senior Full Stack .NET Engineer to help design, build, maintain, and improve business\-critical internal software platforms. This role will work across backend services, frontend applications, APIs, integrations, databases, testing, and production support. * Design, develop, test, and maintain full\-stack applications using .NET / C\# on the backend and modern web technologies on the frontend. * Build and maintain APIs, services, integrations, user interfaces, background jobs, and data\-driven application features. * Work with SQL Server\-backed systems, including data access, query performance, stored procedures where applicable, and production data behavior. * Translate engineering\-ready backlog items and acceptance criteria into practical, maintainable technical solutions. * Partner with Product / Delivery Managers to clarify requirements, edge cases, user workflows, and release expectations. * Partner with Product Group Team Leads / Architects on technical design, implementation approach, estimates, dependencies, and risks. * Write clean, maintainable, testable, and well\-documented code that follows GEO engineering standards. * Participate in code reviews and provide practical feedback to improve quality, maintainability, security, and performance. * Write and maintain automated tests where practical, including unit, integration, API, and UI tests depending on the system. * Support QA and Product / Delivery teams during defect triage, regression testing, UAT support, release readiness, and post\-release validation. * 5\+ years of professional software development experience with strong hands\-on experience in .NET / C\# and ASP.NET Core or similar Microsoft\-based backend technologies. * Strong frontend development experience using Angular; experience with other modern JavaScript / TypeScript frameworks (e.g., React, Vue.js) is a plus. * Strong understanding of HTML, CSS, JavaScript / TypeScript, browser behavior, API integration, and frontend application structure. * Experience designing, building, and maintaining RESTful APIs and integrations with internal and external systems. * Strong experience with relational databases, especially SQL Server; PostgreSQL, MySQL, or other relational databases are also helpful. * Solid understanding of software design patterns, SOLID principles, object\-oriented programming, testability, maintainability, and secure coding practices. * Experience working with existing enterprise applications, production systems, legacy code, or complex business workflows. * Experience using Git\-based workflows, CI/CD pipelines, and standard software development lifecycle practices. * Practical experience with Azure DevOps, Jira, or similar systems for work tracking, backlog execution, code collaboration, and delivery visibility.