Senior Software Developer III

Jobtailor; Washington (WA, District of Columbia); On-site; USD 140,000 - 180,000; Full time

Job summary

Jobtailor seeks a senior software engineer to support mission-critical federal government systems in Washington. You will troubleshoot production issues, collaborate with a high-performing team, and contribute to design, development, and modernization of enterprise applications with secure coding practices.

The role requires TS/SCI clearance, 10+ years of software development, and expertise in C#, .NET, ASP.NET, SQL Server, front-end JS/TS frameworks, and DevOps with Docker.

Qualifications

• Active Top Secret clearance with SCI access.
• Bachelor’s degree in CS or SWE preferred; relevant experience may substitute.
• Certification meeting DoD 8140 (Security+ or higher).
• Azure Developer Associate, AWS Developer Associate, or similar.
• 10+ years of professional software development in mission-critical environments.
• Expertise in C#, .NET, ASP.NET and Entity Framework.
• Front-end: TypeScript/JavaScript/HTML/CSS/Angular/React.
• Back-end: SQL Server/T-SQL.
• Experience with Azure DevOps, GitLab, or GitHub; CI/CD and Docker.
• Windows Server, PowerShell, IIS, Kerberos, OIDC.

Responsibilities

• Troubleshoot and resolve production issues promptly.
• Collaborate in a high-performing team delivering federal systems.
• Support O&M and design, develop, and modernize enterprise apps.
• Apply secure coding across all development phases.
• Participate in code reviews and Agile ceremonies.
• Support CI/CD pipelines and automated deployments.
• Communicate technical decisions clearly to stakeholders.
• Maintain customer trust through professionalism.
• Use creativity to meet mission needs.

Skills

Security clearance

.NET/C#

ASP.NET/WebForms/MVC/REST

TypeScript/JavaScript

SQL/ T-SQL

CI/CD

Docker

Windows Server/PowerShell

Communicating with stakeholders

Education

Bachelor’s degree in Computer Science or Software Engineering

Tools

Azure DevOps

GitHub

Docker

Job description

Responsibilities

• Troubleshoot and resolve production issues in a timely and effective manner
• Work as part of a collaborative, high‑performing team delivering technical solutions for mission‑critical federal government systems
• Support O&M and design, develop, and modernize custom enterprise applications
• Apply secure coding practices across all phases of development
• Participate in code reviews and Agile ceremonies (planning, stand‑ups, retros, etc.)
• Support and contribute to CI/CD pipelines and automated deployments
• Communicate technical decisions and solutions clearly to both technical and non‑technical stakeholders
• Establish and maintain a high level of customer trust and confidence through technical expertise and professionalism
• Use creativity and innovation to deliver solutions that meet customer and mission needs

Requirements

• Active Top Secret with current or previously held SCI access.
• Bachelor’s degree in Computer Science or Software Engineering preferred; relevant experience may substitute.
• Certification meeting DoD 8140 (e.g., Security+ or higher).
• Required certification: Azure Developer Associate, AWS Developer Associate, or recent/relevant software development certification.
• 10+ years of professional software development experience building, testing, and maintaining enterprise applications in mission‑critical environments.
• Expertise in C#, .NET, .NET Framework, Entity Framework, and development using ASP.NET (e.g., WebForms, MVC, REST APIs).
• Front‑end experience with TypeScript, JavaScript, HTML, CSS, Node.js, and Angular and/or React.
• Back‑end experience with database development and administration (e.g., SQL Server, T‑SQL).
• Experience with source code management tools (e.g., Azure DevOps, GitLab, or GitHub), CI/CD pipelines, and containerization using Docker.
• Strong understanding of Windows Server, PowerShell scripting, IIS hosting, Kerberos, and OIDC authentication.
• Ability to contribute immediately with minimal ramp‑up in a dynamic, mission‑critical environment.