Full Stack Software Developer

Senior .NET Developer / Fullstack Developer Location: Onsite, Hybrid – 3x days / week – Washington, DC Clearance Required: Active Secret Join the Mission 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. What You'll Do Support the technical architecture for full stack applications built on .NET (C#/ASP.NET Core), React.js and other modern web frameworks, defining patterns, standards, and best practices for the development teamDesign, build, and maintain highly interactive, responsive web applications using React.js, ASP.NET Core and Azure Cloud Services. Develop test frameworks: Design, implement, and maintain scalable, reusable automated test frameworks from scratch for web UIs and front-end components to support test automation efforts. Evaluate, select, and recommend tools, frameworks, libraries, and platforms — weighing tradeoffs in scalability, maintainability, security, and total cost of ownershipActively participate in technical design reviews, establish coding standards, and oversee code review processes to ensure quality and consistency across the teamDefine and maintain technical roadmaps for application modernization, including migration of legacy SharePoint-backed systems to modern architecturesSupport 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 developmentSupport establishing data architecture and governance patterns for Microsoft Dataverse, including table design, relationships, business rules, and security role modelsGuide API strategy and integration architecture, including RESTful service design, authentication patterns, and integration with Microsoft 365, SharePoint, Teams, and external systemsMentor mid-level and junior developers, conducting knowledge transfer sessions and growing the technical capability of the teamPartner with program leadership, government stakeholders, and technical leads to translate mission requirements into achievable technical solutionsHelp improve CI/CD pipelines, branching strategies, and release management practices to support frequent, reliable deploymentsIdentify and remediate technical debt, performance bottlenecks, and security risks across the application portfolioRemain hands-on as needed — prototyping solutions, unblocking developers, and contributing code to critical-path itemsWork onsite with the team to support rapid collaboration and delivery What You Bring Required Qualifications 5+ years of progressive experience in .NET development (C#, ASP.NET MVC, ASP.NET Core), React.js, xUnit, Playwright, Cypress or Selenium.Hands-on experience with agentic development life cycle to leverage AI Tools to expediate end to end development. Hands-on experience with Cloud services supports web application deployment and management. Demonstrated experience supporting architecture and technology selection decisions for enterprise applications — and the ability to articulate the reasoning behind themStrong command of full stack architecture, including modern frontend frameworks (React or similar), RESTful API design, and service-oriented patternsHands-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 answerExperience 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 applicationsProven experience establishing or maturing CI/CD pipelines and DevOps practices (GitHub Actions, Azure DevOps, or similar)Experience participating in code reviews, setting coding standards, and mentoring development teamsStrong understanding of application security concepts, Active Directory, and identity/access patterns in enterprise environmentsFamiliarity with Microsoft 365 / Office suite — including SharePoint Online, Teams, Outlook, Excel, Word, and OneDrive — in a collaborative enterprise environmentExcellent communication skills, with the ability to present technical recommendations to both engineering teams and non-technical stakeholdersAbility 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 contextFamiliarity with Dataverse for Teams and Power Apps embedded in Microsoft TeamsExperience with TypeScript across frontend and/or Node.js developmentExposure to containerization and orchestration tools such as Docker or KubernetesExperience integrating AI/LLM capabilities or AI-assisted developer tooling into team workflowsUnderstanding of Section 508 accessibility standardsPrior experience supporting federal government programs and working within government security and compliance frameworksRelevant certifications such as Microsoft Certified: Azure Solutions Architect, Power Platform Solution Architect, or equivalent 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.