The Undersea Systems Division at Leidos currently has an opening for a Senior Software Engineer in Lynnwood, WA.  Candidate will join a fast-paced engineering group rapid-prototyping unresolved and emergent requirements for data management that may be addressed with advanced AI tools and architectures.

Primary Responsibilities:

• Direct the architecture, development, and sustainment of mission-critical sensor recording systems across up to several concurrent projects

Collaborate with team to identify embedded firmware and software requirements and evaluate candidate design approaches for solving wide-ranging technical problems.

• Review the current state of the recording system codebase, including any changes made since my departure, to assess what needs attention and prioritize next steps.

• Identify and resolve any existing code quality issues to establish a stable baseline for ongoing development.

• Begin setting up the recording system build in a CI pipeline to enable automated builds and reduce manual integration risk.

• Begin active development on the recording system, picking up priority tasks based on current project needs.

• Provide technical guidance to the development team on the recording system architecture and best practices.

Basic Qualifications

• U.S. Citizen with ability to obtain TOP SECRET security clearance.

•  Software architecture, modernization, and system design expertise

• AI-assisted development using Cursor, LLMs, and agentic workflows

• Expert in C#, .NET, WPF/XAML, SQL Server, XML, and desktop application development

• Extensive experience with GIS, navigation, sonar, imagery, and analytical systems • Proven ability to rapidly understand and improve large legacy codebases

• Ability to read, understand, and interpret complex technical documents.

• Ability to communicate complex ideas orally and visually.

Preferred Qualifications

• 25+ years of experience in development for one or more of the listed applications:

• Languages: C#, T-SQL, Delphi, C++, VBA, ASP, HTML, XML
• Frameworks & Technologies: .NET, WPF/XAML, OpenXML, Word Automation
• Databases: SQL Server, Access, Paradox, dBase
• AI Tools: Cursor, Large Language Models, Agentic Development Workflows
• Platforms: Windows, macOS, Android, iOS
• Tools: Visual Studio, Microsoft Office, Git • Proficiency in Linux command line tools (grep, etc.) and with Linux shell scripting (Bash, etc.).

• Proficiency in data processing.
• Experience in test automation.
• Experience with Graphical User Interfaces.

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting:

June 12, 2026

Pay Range:

Pay Range -

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.