Senior .Net Developer

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Full Time Professional Washington, DC, US

14 days ago Requisition

Location:Onsite, Hybrid - 3x days / week - Washington, DC

Clearance Required:Active Secret

Improvix Technologies is seeking a Senior .NET Developer to provide technical leadership and architectural direction for a fast-paced federal program delivering high-visibility mission outcomes. This role is ideal for a seasoned engineer who has grown beyond writing code into shaping how it gets written - someone who can evaluate competing technologies, define standards, and guide a team of developers toward sound, scalable solutions.

You will serve as the senior technical voice on the team, owning architecture and tooling decisions across a portfolio of Microsoft and modern web applications while mentoring developers and ensuring delivery quality across the full stack.

• Support the technical architecture for full stack applications built on .NET (C#/ASP.NET Core) and modern web frameworks, defining patterns, standards, and best practices for the development team
• Evaluate, select, and recommend tools, frameworks, libraries, and platforms - weighing tradeoffs in scalability, maintainability, security, and total cost of ownership
• Actively participate in technical design reviews, establish coding standards, and oversee code review processes to ensure quality and consistency across the team
• Define and maintain technical roadmaps for application modernization, including migration of legacy SharePoint-backed systems to modern architectures
• Support architectural oversight for Microsoft Power Platform solutions - guiding when Power Apps (canvas and model-driven), Power Automate, and Dataverse are the right fit versus custom development
• Support establishing data architecture and governance patterns for Microsoft Dataverse, including table design, relationships, business rules, and security role models
• Guide API strategy and integration architecture, including RESTful service design, authentication patterns, and integration with Microsoft 365, SharePoint, Teams, and external systems
• Mentor mid-level and junior developers, conducting knowledge transfer sessions and growing the technical capability of the team
• Partner with program leadership, government stakeholders, and technical leads to translate mission requirements into achievable technical solutions
• Help improve CI/CD pipelines, branching strategies, and release management practices to support frequent, reliable deployments
• Identify and remediate technical debt, performance bottlenecks, and security risks across the application portfolio
• Remain hands-on as needed - prototyping solutions, unblocking developers, and contributing code to critical-path items
• Work onsite with the team to support rapid collaboration and delivery

• 5+ years of progressive experience in .NET development (C#, ASP.NET MVC, ASP.NET Core)
• Demonstrated experience supporting architecture and technology selection decisions for enterprise applications - and the ability to articulate the reasoning behind them
• Strong command of full stack architecture, including modern frontend frameworks (React or similar), RESTful API design, and service-oriented patterns
• 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
• Experience leading SharePoint modernization or migration efforts, with familiarity across SharePoint Online and legacy SharePoint (2013 or newer)
• Deep experience with MS SQL, Entity Framework, and database design for enterprise applications
• Proven experience establishing or maturing CI/CD pipelines and Dev Ops practices (Git Hub Actions, Azure Dev Ops, or similar)
• Experience participating in code reviews, setting coding standards, and mentoring development teams
• 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 One Drive - 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
• Familiarity with Dataverse for Teams and Power Apps embedded in Microsoft Teams
• Experience with Type Script across frontend and/or Node.js development
• Exposure to containerization and orchestration tools such as Docker or Kubernetes
• Experience…