Senior .Net Developer
Improvix Technologies, Inc.
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
- 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)
- 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
- 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
Vacancy posted 15 hours ago
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