By Light Professional IT Services LLC readies warfighters and federal agencies with technology and systems engineered to connect, protect, and prepare individuals and teams for whatever comes next. Headquartered in McLean, VA, By Light supports defense, civilian, and commercial IT customers worldwide. 

By Light is seeking a highly skilled Senior Full Stack Developer to join a software development and network engineering team responsible for designing, integrating, producing, testing, and deploying cyber range environments worldwide. This role operates with minimal supervision and spans requirements analysis, architecture, coding, testing, validation, and research in support of advanced cyber training systems.

• Develop and maintain a modern, responsive web interface.
• Build backend scoring services, databases, and automated scoring agents for Windows and Linux.
• Conduct system testing within integrated cyber range environments.
• Create and maintain administrative, technical, and end‑user documentation.
• Collaborate with the RangeOS development team to ensure seamless integration with versioned cyber ranges.

Analysis and Design

• Contribute to solution designs that align with requirements and system constraints.
• Estimate effort, complexity, and timelines for assigned tasks.

Coding

• Implement clean, efficient, and maintainable code using modern programming practices.
• Select optimal algorithms and approaches to solve technical problems.
• Apply sound logic and design principles to feature development.
• Follow established coding conventions and standards.

Documentation

• Internal: Document code structures, logic flows, and module behavior.
• Process: Produce clear technical documentation for developers, engineers, and stakeholders.
• External: Develop customer‑facing documentation as required.
• Demonstrate strong written, verbal, and presentation skills.

Testing

• Perform unit testing to validate functionality.
• Support integration and validation testing across complex system environments.

• Bachelor’s degree in a computer‑related field and 3+ years of web development experience, or 6+ years of equivalent professional experience.
• 8570 IAT Level II certification or ability to obtain certification within 6 months
• Strong full‑stack development background, including:
  • Proficiency in one or more of the following: Node.js, React, jQuery/JavaScript, PostgreSQL or MySQL, AMQP.
  • Expertise with Git‑based source control (Git, Bitbucket).
  • Experience developing system services and daemons.
  • Understanding of Linux virtualization concepts (KVM).
  • Experience with Node.js frameworks such as Express, OpenAuth, and Socket.io.
  • Familiarity with AMQP or similar message‑oriented middleware.
  • Working knowledge of networking, Linux, Windows, testing practices, and Agile SDLC.
• Experience with cyber ranges, cyber training platforms, or simulation environments.
• Understanding of orchestrated training events, exercise lifecycle, and multi‑vendor tool integration.
• Familiarity with infrastructure automation (Terraform preferred).
• Ability to operate across complex, multi‑vendor, hybrid environments (RCS/ECS/cloud).

• Containerization experience (Docker, image optimization).
• CI/CD pipeline development (GitHub Actions, GitLab CI, Jenkins).
• Cloud platform experience (AWS, Azure, GCP).
• Knowledge of microservices and serverless architectures.
• Strong REST API design and versioning practices.
• Authentication and authorization implementation.
• Experience with background processing, queues, and event‑driven architectures.
• Ability to design maintainable, modular business logic.

• DoD Top Secret security clearance (Or the ability to obtain one)
• Up to 10% travel