Senior .Net Developer

Senior .NET Developer / Tech Lead

Location: Onsite, Hybrid - 3x days / week - Washington, DC (3 on, 2 off)

Clearance Required: Active Secret

Join the Mission

Improvix Technologies is seeking a Senior .NET Developer / Tech Lead to support a fast-paced federal program delivering high-visibility mission outcomes. This role blends hands-on full stack development with technical leadership - ideal for a seasoned engineer who can build alongside the team while owning architecture, tooling decisions, and engineering standards at a higher level.

You will develop, maintain, and enhance applications built on Microsoft and modern web technologies - leveraging AI-powered developer tools to accelerate delivery - while serving as the senior technical voice guiding tool selection, design decisions, and the growth of the development team.

What You'll Do

• Design, develop, and maintain full stack applications using .NET (C#/ASP.NET Core) on the backend and React on the frontend, while owning the technical architecture, patterns, and standards behind them
• Evaluate, select, and recommend tools, frameworks, libraries, and platforms - weighing tradeoffs in scalability, maintainability, security, and total cost of ownership
• Build and consume REST APIs and guide the team's overall API strategy, including service design, authentication patterns, and integration with Microsoft 365, SharePoint, Teams, and external systems
• Develop scalable Node.js services and middleware to support application workflows
• Leverage AI-powered developer tools - including GitHub Copilot, OpenAI Codex, and similar assistants - to accelerate coding, code review, and documentation, and guide the team's adoption of AI-assisted engineering practices
• Integrate and evaluate LLM-based features and AI APIs (e.g., OpenAI, Azure OpenAI) into application workflows where applicable
• Design and build Power Apps (canvas and model-driven) to automate business processes, and provide architectural guidance on when Power Platform is the right fit versus custom development
• Configure and manage Microsoft Dataverse as a data platform - including table design, relationships, business rules, and security roles - and establish data governance patterns for the team
• Develop Power Automate flows to integrate Power Platform solutions with Microsoft 365, SharePoint, Teams, and external APIs
• Lead the modernization of legacy SharePoint-backed systems, defining migration roadmaps and executing against them
• Lead technical design reviews, establish coding standards, and oversee code review processes to ensure quality and consistency across the team
• Mentor mid-level and junior developers, conducting knowledge transfer sessions and growing the technical capability of the team
• Define and improve CI/CD pipelines, branching strategies, and release management practices to support frequent, reliable deployments
• Perform operational support (O&M), bug fixes, and enhancements across the application stack, prioritizing and remediating technical debt, performance bottlenecks, and security risks
• Partner with program leadership, government stakeholders, and team members to translate mission requirements into achievable technical solutions and meet delivery timelines
• Troubleshoot, debug, and test applications across frontend and backend layers to ensure stability and performance
• Work onsite with the team to support rapid collaboration and delivery

What You Bring

Required Qualifications

• Bachelor's degree in Computer Science, Information Technology, or related field (or equivalent experience)
• 8+ years of progressive experience in .NET development (C#, ASP.NET MVC, ASP.NET Core), including experience in a technical lead or senior engineering role
• Demonstrated experience making architecture and technology selection decisions for enterprise applications - and the ability to articulate the reasoning behind them
• Proficiency in React - including hooks, component design, state management, and building responsive UIs
• Experience developing server-side applications or APIs with Node.js
• Demonstrated use of AI-powered developer tools such as GitHub Copilot, OpenAI Codex, or similar code-generation assistants in a professional setting
• Hands-on experience with Microsoft Power Platform - including Power Apps (canvas and/or model-driven), Power Automate, and Power BI - with the judgment to know when low-code is and isn't the right answer
• Working knowledge of Microsoft Dataverse - including data modeling, table configuration, relationships, and security roles
• Experience supporting or modernizing SharePoint-backed systems, with familiarity across SharePoint Online and legacy SharePoint (2013 or newer)
• Deep experience with MS SQL, Entity Framework, and RESTful API design and consumption
• Experience establishing or maturing CI/CD pipelines and deployment workflows, with strong Git fundamentals for source control and collaborative development
• Experience leading code reviews, setting coding standards, and mentoring developers
• Strong understanding of application security concepts, Active Directory, and identity/access patterns in enterprise environments
• Familiarity with Microsoft 365 / Office suite - including SharePoint Online, Teams, Outlook, Excel, Word, and OneDrive - in a collaborative enterprise environment
• Excellent communication skills, with the ability to present technical recommendations to both engineering teams and non-technical stakeholders
• Ability to work onsite in a federal environment (occasional Saturday hours may be required for deployment activities)

Preferred Qualifications

• Experience architecting solutions in Azure cloud environments, including deployments in a federal or FedRAMP context
• Experience integrating LLM/AI APIs (e.g., Azure OpenAI, OpenAI API, Hugging Face) into production applications
• Familiarity with AI development platforms and prompt engineering techniques
• Familiarity with Dataverse for Teams and Power Apps embedded in Microsoft Teams
• Experience with GitHub Actions, Azure DevOps, or similar CI/CD pipelines
• Familiarity with TypeScript for frontend and/or Node.js development
• Exposure to containerization tools such as Docker or Kubernetes
• Understanding of Section 508 accessibility standards
• Relevant certifications such as Microsoft Certified: Azure Solutions Architect, Power Platform Solution Architect, or equivalent

Why Improvix

At Improvix Technologies, we don't just deliver IT solutions - we deliver mission success. Our teams support critical government programs by building secure, innovative, and scalable technology that enables agencies to operate more efficiently and securely.

We believe great technology starts with great people. That's why we invest in our employees' growth, well-being, and long-term success.

Our benefits include:

• Competitive compensation and performance-based incentives
• 401(k) with company match
• Three weeks of paid annual leave that increases with tenure
• Comprehensive medical, dental, and vision insurance
• Life insurance and disability coverage
• Transit and commuting benefits
• Professional development and paid training opportunities

At Improvix, you'll join a collaborative, mission-focused environment where your expertise drives meaningful impact.

Equal Opportunity Employer

Improvix Technologies, Inc. is an Equal Opportunity Employer and is committed to building a diverse and inclusive workplace. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, protected veteran status, or any other characteristic protected by federal, state, or local law.

Improvix is committed to providing reasonable accommodations to qualified individuals with disabilities during the application and employment process. If you require assistance or accommodation, please contact our Human Resources team.

Security Clearance / Citizenship Requirements

Due to the nature of our government contracts, U.S. citizenship may be required for certain positions, and some roles may require the ability to obtain and maintain a U.S. government security clearance.

Pay Transparency Statement

In accordance with applicable laws and regulations, Improvix Technologies will not discharge or otherwise discriminate against employees or applicants for discussing, disclosing, or inquiring about compensation.