Full Stack Software Developer (C#/.NET)

Improvix; Washington (District of Columbia); Hybrid; USD 170,000 - 190,000; Full time

Job summary

Improvix Technologies in Washington, DC is seeking a Senior .NET Developer to provide technical leadership and architectural direction for a federal program delivering high-visibility outcomes. You will own architecture decisions across Microsoft stack and mentor developers.

Join a fast-paced team onsite/hybrid in Washington, DC, with opportunities to define standards, improve CI/CD, and guide modern web applications using .NET and React.

Qualifications

• 5+ years of progressive .NET development (C#, ASP.NET MVC/Core).
• Experience with React.js, xUnit, Playwright, Cypress or Selenium.
• Hands-on use of AI tools to accelerate end-to-end development.
• Cloud deployment experience with Azure services for web apps.
• Ability to articulate architecture decisions for enterprise apps.

Responsibilities

• Define and enforce architecture standards for full-stack apps.
• Lead design reviews and establish coding standards across the team.
• Mentor mid-level and junior developers and oversee CI/CD pipelines.
• Partner with stakeholders to translate requirements into technical solutions.
• Prototype solutions and contribute code to critical-path items.
• Support modernization and migration of legacy systems.

Skills

C#

ASP.NET Core

React.js

xUnit

Playwright

Cypress

Selenium

AI Tools in SDLC

Cloud deployment

CI/CD

Tools

GitHub Actions

Azure DevOps

Azure Cloud Services

SharePoint Online

Power Platform

Dataverse

Microsoft 365

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

Full Stack Software Developer (C#/.NET)

FullTime Professional Washington, DC, US

3 days ago Requisition ID: 1140

Salary Range: $170,000.00 To $190,000.00 Annually

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.jsand other modern web frameworks, defining patterns, standards, and best practices for the development team
• Design, 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 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

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 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 DevOps practices (GitHub Actions, Azure DevOps, 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 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
• Familiarity with Dataverse for Teams and Power Apps embedded in Microsoft Teams
• Experience with TypeScript across frontend and/or Node.js development
• Exposure to containerization and orchestration tools such as Docker or Kubernetes
• Experience integrating AI/LLM capabilities or AI-assisted developer tooling into team workflows
• Understanding of Section 508 accessibility standards
• Prior experience supporting federal government programs and working within government security and compliance frameworks
• Relevant 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.