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Added 47 mins ago
Full-Stack Web Developer - WordPress
CACI, INC.-FEDERAL
Chantilly, VA
CACI is seeking a proactive, cleared Full‑Stack Web Developer who thrives in a fast‑paced environment and enjoys collaborating to create high‑impact solutions. In this role, you will…
Added 53 mins ago
Systems Engineer
Radiance Technologies, Inc.
Beavercreek, OH
Radiance Technologies is an employee-owned company with benefits that are unmatched by most companies in the Dayton OH area. Employee ownership, generous 401K, full…
Added 3 hours ago
Full-Stack Web Developer - WordPress
CACI
Chantilly, VA · Chantilly
CACI is seeking a proactive, cleared Full‑Stack Web Developer who thrives in a fast‑paced environment and enjoys collaborating to create high‑impact solutions. In this role, you will…
Added 4 hours ago
Senior DevOps Engineer, Observability and FinOps
CACI, INC.-FEDERAL
Reston, VA · Rome, NY · Denver, CO
Minimum Clearance Required to Start: TS/SCI with Polygraph
Added 4 hours ago
Senior DevOps Engineer, Observability and FinOps
CACI
Reston, VA · Rome, NY · Denver, CO · Reston · Rome · Denver
Minimum Clearance Required to Start: TS/SCI with Polygraph
Added 16 hours ago
Software Test Automation Engineer w/ TS/SCI clearance
GD Information Technology, Inc.
United States
Active TS/SCI clearance with the required polygraph.
Added 20 hours ago
A
AI Engineer SME
AnaVation
Chantilly, VA
- $95,352.72 to $212,566.06 USD / year
This position requires an active Top Secret (TS) clearance and the ability to obtain SCI access with a CI polygraph. This position is on-site in Chantilly, VA.
Added 23 hours ago
W
Artificial Intelligence Machine Learning Skill Level 1
Wyetech
Annapolis Junction, MD
- $20 to $50 USD / hour
Required Clearance: Active TS/SCI with Full Scope Polygraph (in scope within the past 7 years)
Added 1 day ago
Java Cloud Software Engineer
Peraton
Annapolis Junction, MD
Active TS/SCI with current polygraph required
Added 1 day ago
Kubernetes Application Software Engineer
Peraton
Laurel, MD
Active TS/SCI with current Polygraph required
Added 1 day ago
Full Stack Java Cloud Software Engineer
Peraton
Annapolis Junction, MD
Active TS/SCI with current polygraph required
Added 1 day ago
Senior Application Developer
Belay Technologies
Annapolis Junction, MD
Belay Technologies is seeking a Senior Application Developer to join our intel team. You will act as a general-purpose Software Engineer and CNO Reverse Engineer for up-and-coming projects…
Added 1 day ago
Windows System Administrator, Sr.
Unisity, LLC
Annapolis Junction, MD
…appropriate security clearance is required. (e.g. Active TS/SCI security clearance with customer appropriate…
Added 1 day ago
SOFTWARE INTEGRATION ENGINEER - Linux/Bash/Jira - 8+ yrs of Experience - TS/SCI w/Poly clearance is required - ID - 542
Halogen Engineering Group, Inc
Annapolis Junction, MD
Generate documentation for the full software stack.
Added 1 day ago
W
ID Software Integration Engineer (SIE) Level 3
Wyetech
Annapolis Junction, MD
- $82.14 to $103.82 USD / hour
Required Clearance: Active TS/SCI with Full Scope Polygraph
Added 1 day ago
Sr. Full Stack Developer
Ideal Innovations
Bethesda, MD
As a Sr. Full Stack Developer on this program, you will have the opportunity to build strong systems, software, and cloud environments and provide operations and maintenance for critical…
Added 1 day ago
Cognitive AI Engineer SWE
Bigbear.ai
Annapolis Junction, MD
Design, develop, and maintain full-stack applications across frontend and backend systems.
Added 2 days ago
Digital Signal Processing Software Engineer
Booz Allen Hamilton_United States
McLean, VA
Develop full-stack software applications that integrate digital signal processing algorithms and RF theory techniques. Apply leading-edge principles, theories, and concepts and contribute…
Added 2 days ago
Senior Full Stack Developer
LEIDOS, INC.
Reston, VA
Leidos is looking for a Senior Full Stack Developer / Senior Software Engineer to guide the technical support, development, and expansion of our core application ecosystem. In this role,…
Added 2 days ago
Sr. Full Stack Developer
LEIDOS, INC.
Bethesda, MD
This is an excellent opportunity for an accomplished software developer to apply their expertise in full stack development, cloud technologies, and modern DevOps practices while…
Added 2 days ago
Senior Full Stack Developer
LEIDOS, INC.
Bethesda, MD
As a Full Stack Developer on this program, you will have the opportunity to build strong systems, software, and cloud environments and provide operations and maintenance for critical…
Added 2 days ago
Senior Application Developer (Full Stack)
Belay Technologies
Fort Meade, MD
Belay Technologies is seeking a Senior Application Developer to join our intel team. You will operate as a Full Stack Software Engineer on the Enduring Targets, Global Technology section's…
Added 2 days ago
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Software Engineer (SWE) Skill Level 2,Software Engineer (SWE) Skill Level 3
Wyetech
Fort Meade, MD
- $86.14 to $122.7 USD / hour
Required Clearance: Active TS/SCI with Full Scope Polygraph
Added 2 days ago
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System Engineer Skill Level 6
Wyetech
Fort Meade, MD
- $100.3 to $126.76 USD / hour
Required Clearance: Active TS/SCI with Full Scope Polygraph
Added 2 days ago
Lead, Software Engineer - TS/SCI
L3Harris
Palm Bay, FL
…matter. You will work on a wide range of projects, from modern full-stack web applications using React, TypeScript, JavaScript, Python, Docker, and Linux to embedded software integrated…

LEIDOS, INC.

Senior Full Stack Developer

Reston, VA, United States

Pay Range $131,300.00 - $237,350.00 The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary.

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Job details

Pay: Pay Range $131,300.00 - $237,350.00 The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary.
Experience: BS degree and 12 – 15 years of prior relevant experience or Masters with 10 – 13 years of prior relevant experience.
Posting language: English
Posted: Oct 27, 2026

Original job description

Leidos is looking for a Senior Full Stack Developer / Senior Software Engineer to guide the technical support, development, and expansion of our core application ecosystem. In this role, you will take immediate hands on ownership of our modern stack built on React.js, Node.js, Python, and PostgreSQL. Your initial focus will include overseeing a straightforward, simple transition of existing web applications (internal tools and core applications) into our ecosystem. This is a direct, functional transition without the need for complex, heavy migration planning. As a senior member of the team, you will help scale active applications, design new features, and collaborate with other innovative technology experts to build brand-new software applications from scratch to fill emerging requirements. You will lend your robust engineering skills to support our modern features, including assisting with the integration of AI-driven tools, chat interfaces, workflows, and data pipelines into our core ecosystem. You will work closely within a highly collaborative, fast-moving small team environment.

Technical Execution & Application Support

Technical Ownership: Act as a core technical lead for all active web applications, taking responsibility for their overall system health, code quality, and technical design.
Application Support: Oversee day-to-day maintenance, troubleshooting, and operational support to ensure application reliability.
Seamless Transitions: Manage the simple, direct transition of core tools into our supported ecosystem with minimal friction.

Greenfield Development & Innovation

New Feature & App Creation: Architect and build high-impact features, optimize backend processing scripts in Python, scale Node.js services, and design high-performance APIs (FastAPI/RESTful).
Modern Integration Support: Assist with the development and technical plumbing required for emerging features, including chat interfaces, RAG concepts, and intelligent application components.
Code Quality & Mentorship: Conduct code reviews, establish testing strategies, and mentor a Mid-Level developer to maintain a pristine codebase.
Foundational Codebases: Set up and maintain foundational repositories, boilerplates, and clean code standards for the React/Node/Python stack.

Basic Qualifications

Must have an active TS/SCI with Polygraph
BS degree and 12 – 15 years of prior relevant experience or Masters with 10 – 13 years of prior relevant experience. May possess a Doctorate in technical domain.
Develops solutions that are highly innovative, and achieved through research and integration of best practices.
Recommends and develops new technical solutions, products, and/or standards in support of the program’s strategy and operations.
Duties include computer programming, documenting, managing configuration, testing, and bug fixing involved in creating and maintaining applications and frameworks involved in a software release life cycle and resulting in a software product.
Expertise in JavaScript/TypeScript Ecosystems: Strong experience building production-grade web applications using React.js and Node.js.
Python & API Proficiency: Strong experience using Python for backend services, background jobs, or data processing pipelines, with deep knowledge of building robust RESTful APIs (specifically using frameworks like FastAPI).
Database Design: Strong command of PostgreSQL (or similar relational databases), including schema design, indexing, complex joins, and query optimization.
C# / .NET Literacy (Read-Only): You do not need to write or maintain C# moving forward, but you must be comfortable reading and understanding legacy structures to help guide simple application transitions.
Modern Tooling: Deep familiarity with Git and CI/CD concepts.

Preferred Qualifications

Agile Frameworks: Practical experience working effectively within an Agile-based development environment (Scrum, Kanban, or similar sprint-based workflows).
AI & Modern Workflow Familiarity: Practical experience or familiarity supporting AI-adjacent application features, such as conversational/chat interfaces, vector databases, or Retrieval-Augmented Generation (RAG) architectures.
Containerization (Docker): Experience with Docker configurations, container security, or image hardening is a plus, but containerization is not a strict requirement for this role.

Preferred Soft Skills & Experience

The "Small Team" Mindset: Thrives in a small team environment where you have high autonomy, direct business impact, and less corporate red tape.
Innovation & Ideation: Eager to brainstorm with other technical experts to build new platforms and solve fresh problems from the ground up.
Pragmatic Delivery: Focused on shipping clean, working software on time rather than over-engineering complex frameworks.

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:

October 27, 2026 For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

Pay Range $131,300.00 - $237,350.00 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.

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