Software Engineer III with TS/SCI Polygraph

Deloitte is seeking a Software Engineer III to help design, build, and maintain secure, scalable applications in a compliance-driven environment. Working with the Process Engineering and Automation team, you will support technology-enabled improvements to business processes through full-stack development and AI-enabled capabilities. This role is based in Rosslyn, VA and requires an active TS/SCI clearance with polygraph.

Role overview

• Design, build, and maintain full-stack web applications, including user interfaces, databases, and server-side services, aligned to program requirements and security standards.
• Own assigned features across the software development life cycle, including requirements analysis, solution design, development, testing, deployment support, and maintenance.
• Develop and enhance applications using Python, HTML, CSS, .NET, and PowerShell, with security controls and secure coding practices built into day-to-day work.
• Integrate artificial intelligence capabilities, including large language model features, agentic workflows, intelligent search, and AI-assisted user experiences.
• Create and maintain unit, integration, and end-to-end tests; participate in code reviews; and document APIs, data models, and architectural decisions.

Team context

• The Process Engineering and Automation team improves business processes through technology-enabled solutions.
• The team works across automation, artificial intelligence, robotic process automation, agentic workflows, and scripting tools to deliver scalable solutions that support operational efficiency and business needs.
• Collaboration is focused on designing, building, and enhancing tools to solve complex process challenges in secure, highly regulated environments.

Required qualifications

• Bachelor’s degree
• 4+ years of application development experience, including test-driven development.
• 4+ years with Python and full-stack web development technologies, including React, HTML, CSS, .NET, and APIs.
• 4+ years across the software development life cycle, including requirements analysis, design, development, testing, deployment, and maintenance.
• Active Top Secret/Sensitive Compartmented Information (TS/SCI) clearance with polygraph.
• Ability to travel 10-25%, on average, based on work and client/industry needs.
• Must be legally authorized to work in the United States without employer sponsorship, now or in the future.

Technologies

• Python, HTML, CSS, .NET, PowerShell, React, APIs
• Large language model features, agentic workflows, intelligent search

Preferred qualifications

• Experience with PostgreSQL schema design and relational database development.
• Experience building applications with React and .NET.
• Experience implementing security controls aligned to OWASP Top 10 guidance.
• Experience integrating large language model capabilities, agentic workflows, or intelligent search into applications.
• Experience writing unit, integration, and end-to-end tests in a CI/CD environment.
• Experience supporting Authority to Operate (ATO) documentation or security review processes in classified environments.

Compensation

• Estimated wage range: $119,000 to $218,300 per year.
• May be eligible for a discretionary annual incentive program, subject to applicable program rules, based on individual and organizational performance.

Location: Rosslyn, VA (onsite)