Senior Lead Developer

Empower, Innovate, Impact!   At Team A-TEK, we EMPOWER people to drive INNOVATION that IMPACTS mission! A-TEK operates at the intersection of mission and innovation by applying our deep domain expertise across the federal markets. Embracing our digital-first strategy, A-TEK provides enhanced capabilities in application development, digital transformation, enterprise IT, and scientific services. Our solutions are designed to modernize, automate, secure, protect, and enhance the operations of our federal clients, ensuring they stay ahead in a rapidly evolving digital landscape. Our work is fueled by a passion to serve our clients’ needs and to protect the safety and welfare of Americans. That passion shapes how we nurture our most valuable asset – Our Employees. A-TEK actively cultivates the talent that drives our success and fosters a creative, challenging, and mission-driven work environment for current and future employees. The Senior Lead Developer serves as the technical leader for enterprise application development activities supporting a Federal civilian agency's Application Development and Support Services (ADSS) program. This position leads the design, development, modernization, integration, testing, deployment, and operational support of mission-critical business applications across Microsoft 365, Azure Government, and modern cloud-native platforms. The Senior Lead Developer provides hands-on technical leadership while mentoring development teams, establishing development standards, conducting code reviews, and ensuring software quality throughout the Agile software development lifecycle. The role is expected to balance new development with modernization of existing applications, leveraging Python, React, .NET, Microsoft Power Platform, SQL Server, PostgreSQL, and Azure cloud services. This is a hybrid position based in Washington, DC. Key Responsibilities Technical Leadership Lead software development efforts across multiple Agile development teams. Serve as the senior technical authority for application design and implementation. Establish development standards, coding guidelines, and engineering best practices. Mentor and coach developers through design reviews, pair programming, and technical guidance. Conduct peer code reviews and approve production-ready code. Application Development Design, develop, test, deploy, and maintain enterprise web applications. Develop modern React-based user interfaces. Design and develop scalable Python backend services and RESTful APIs. Maintain and enhance existing C#/.NET applications while supporting long-term modernization initiatives. Develop reusable software components and shared application services. Integrate enterprise applications with Microsoft 365, Power Platform, Azure services, and external systems. Cloud Modernization Lead migration of legacy applications to modern cloud-native architectures. Design scalable solutions using Azure Government services. Support migration from SQL Server to PostgreSQL where appropriate. Implement microservices, API-first architectures, and container-ready applications where applicable. Participate in modernization assessments and technology roadmaps. Database Development Design relational database schemas. Develop SQL Server and PostgreSQL stored procedures, views, and optimized queries. Support data migration and data quality initiatives. Optimize application performance through database tuning. DevSecOps Build and maintain CI/CD pipelines using Azure DevOps and/or GitHub. Implement automated builds, testing, and deployments. Integrate static and dynamic application security testing into development pipelines. Maintain Software Bills of Materials (SBOMs) for production releases. Support infrastructure-as-code and automated deployment practices. Software Quality Develop automated unit, integration, and regression tests. Ensure all development complies with secure coding standards. Support Section 508 accessibility compliance. Participate in sprint planning, backlog refinement, demonstrations, and retrospectives. Resolve production issues and perform root cause analysis. Security & Compliance Support Authority to Operate (ATO) activities. Remediate security vulnerabilities identified through automated scanning or penetration testing. Ensure compliance with: FISMA NIST SP 800-53 Zero Trust principles Federal secure software development requirements Agency security policies Documentation Produce technical design documentation. Maintain system architecture documentation. Document APIs and integration specifications. Develop deployment guides and operational runbooks. Maintain software configuration documentation. Minimum Qualifications Bachelor's degree in Computer Science, Information Systems, Engineering, or related technical discipline. Minimum 10 years of professional software development experience. Minimum 5 years supporting Federal Government IT systems. Demonstrated experience leading software development teams. Experience delivering enterprise applications using Agile methodologies. Strong verbal and written communication skills. Required Technical Skills Programming Languages Python C# .NET JavaScript/TypeScript SQL Front-End Technologies React HTML5 CSS3 Responsive web design Backend Technologies Python frameworks (FastAPI, Flask, or Django) ASP.NET Core REST API development JSON/XML Databases PostgreSQL Microsoft SQL Server Entity Framework Dataverse Cloud Platforms Microsoft Azure Azure Government Azure App Services Azure Functions Azure Storage Azure Key Vault Microsoft Technologies Microsoft 365 Power Apps Power Automate Power Pages Power BI SharePoint Online Microsoft Teams DevOps Git Azure DevOps GitHub CI/CD pipelines Automated testing Infrastructure as C