Freelance C#/.NET Full Stack Engineer

Company Description ThreatXIntel is a startup cyber security company dedicated to delivering customized, affordable solutions to protect businesses and organizations from cyber threats. With services including cloud security, web and mobile security testing, and DevSecOps, we aim to provide high-quality cyber security services to businesses of all sizes. Our proactive approach involves continuous monitoring and testing to ensure the security of our clients' digital environments. Role Description We are seeking a Senior Software Engineer (Freelance) with strong expertise in the design, development, deployment, and maintenance of web-based applications and relational databases to support program and project management systems. The ideal candidate will bring deep technical skills, especially in the .NET stack , SQL Server , and project reporting tools , and be comfortable working with data from multiple enterprise systems. Key Responsibilities: Lead architecture and development of custom software applications supporting project and program management systems. Translate business requirements into efficient data flows and application logic. Design, implement, and maintain web and mobile applications using C#.NET , ASP.NET , JavaScript , HTML5 , CSS3 , and SQL Server . Build and maintain reports, dashboards, and data integrations using data from ERP, HRIS, CMS, PMTools, and other external systems. Create SQL queries, stored procedures, triggers, and views for data retrieval, transformation, and reporting. Coordinate integration of project data with external partners and systems. Provide technical leadership and documentation across the software lifecycle, including requirements gathering, coding, testing, deployment, and maintenance. Mentor and support other developers or consultants as needed. Contribute to solution design, debugging, performance monitoring, and testing routines. Technical Environment: Languages & Frameworks: C#.NET, ASP.NET, HTML5, CSS3, JavaScript, jQuery, VBA, Python (desirable), Java (desirable), MVC Tools & Platforms: Visual Studio, IIS, SQL Server, Azure (preferred) Databases: SQL Server, Access Other Systems (for integration/data sharing): ERP, PMTools, CMS, HRIS, IMBM, EcoInteractive ProjecTrak, BidNet Required Skills & Experience: 5+ years of experience in software engineering, application development, and data integration (preferably within government, infrastructure, or transportation domains). Strong expertise in the Microsoft stack : Visual Studio, .NET Framework, SQL Server. Proficient in SQL: writing queries, stored procedures, views, and triggers. Experience developing web applications and tools for data reporting, dashboards, or project tracking. Familiarity with Agile development principles and documentation best practices. Strong problem-solving skills and ability to work independently with cross-functional teams. Excellent communication skills to interact with both technical and non-technical stakeholders. Show more Show less