Full Stack Developer

COMFORT SYSTEMS; Arlington (VA); On-site; USD 107,900 - 195,050; Full time

Benefits offered by this job

Health and Wellness programs

Paid Leave

Retirement benefits

Job summary

COMFORT SYSTEMS is seeking an experienced Full Stack Developer to support the Compartmented Enterprise Services Office (CESO) program. This role will develop, test, and maintain secure applications across the full tech stack.

The ideal candidate has at least 8 years of experience in IT and is proficient in Java, JavaScript, and Python. The position is on-site in Arlington, VA, with some travel required.

Qualifications

• 8 years minimum of experience in Information Technology.
• Demonstrated experience across the full stack (front-end + back-end + database).
• Experience with automated testing and modern software delivery practices.
• Strong collaborative skills with cross-functional teams.

Responsibilities

• Design and develop full-stack applications in an Agile environment.
• Collaborate with UX/design for user-friendly front-end features.
• Build and maintain back-end services and APIs.
• Ensure data integrity and performance via optimized database queries.

Skills

Java

JavaScript

Python

SpringBoot

HTML/CSS

Oracle

SQL Server

Ansible

Terraform

Automated Testing

Education

BA/BS in Information Technology

Tools

GitLab

Jenkins

Docker

AWS EC2

JMeter

Job description

Description

Leidos is seeking an experienced Full Stack Developer to support the Compartmented Enterprise Services Office (CESO) program delivering mission‑focused software capabilities for DISA. This role develops, tests, and maintains secure, reliable applications across the full technology stack (front‑end, APIs/services, and data). Full stack developers can switch between front‑end and back‑end development based on requirements and help the team prototype rapidly when needed. This person should be a seasoned, self‑motivated, and professional with at least 8 years of hands‑on engineering and administration experience in virtualized Information Technology environments.

This position is 100% on‑site in Arlington, VA. Occasional, situational travel within the DC‑Metro area may be required.

PRIMARY RESPONSIBILITIES

• Design, develop, test, and maintain full‑stack applications (UI, service/API layer, and data access layer) in an Agile delivery environment.
• Participate in software programming initiatives to support innovation and enhancement, using Java, JavaScript, Python, SpringBoot.
• Implement responsive, user‑friendly front‑end features and collaborate with UX/design to ensure usable, accessible experiences.
• Build and maintain back‑end services and APIs; implement business logic, integrations, and data access patterns.
• Develop, maintain, and evolve a modernized database architecture aligned to modernization initiatives, including cloud adoption.
• Create and optimize database queries and data models; ensure data integrity and performance.
• Write automated tests and participate in code reviews to improve quality, security, and maintainability.
• Troubleshoot, debug, and resolve defects across the stack; support production and lower‑environment issue resolution as required.
• Produce technical documentation (design notes, API documentation, and operational runbooks) aligned to program needs.
• Operate and improve reliability/availability through monitoring, alerting, incident response, and continual service improvement.
• Produce and maintain technical documentation (build guides, runbooks, diagrams, and operational procedures).
• Stage new and upgraded services components or services to integration and testing environment.
• Develop and engineer improvements to the infrastructure and architecture to support continuous development and continuous integration utilizing modern practices and tools.
• Support and perform deployment orchestration, automation, and security configuration management (i.e., CloudFormation, Terraform, Ansible, GitLab, Bitbucket).
• Maintain documentation of code developed in support of CESO environments.
• Support patching, logging, vulnerability scanning, and compliance tracking.
• Participate in the release management process.
• Participate in Agile ceremonies (daily stand‑ups, sprint planning, retrospectives) and Jira‑based task tracking.

BASIC QUALIFICATIONS

• Candidate must currently have a TS and SCI eligible with the ability to obtain and maintain a CI Poly.
• BA/BS and 8 years minimum of experience in Information Technology.
• Demonstrated experience developing and supporting applications across the full stack (front‑end + back‑end + database).
• Experience with modern front‑end fundamentals (HTML/CSS/JavaScript) and building responsive user experiences.
• Experience with back‑end development concepts such as APIs, server‑side logic, and database interaction.
• Hands‑on technical experience in at least three of the following areas: Oracle, SQL Server, Java, engineered systems, cloud technologies, data integration, automated testing and deployments, and DevSecOps.
• Strong background in automated testing, CI/CD, and modern software delivery practices.
• Experience with software development languages/environments such as: JavaScript, GitLab, Jenkins, Ansible Automation, Java, PSSQL, YAML, and Terraform.
• Ability to work effectively with cross‑functional teammates and contribute across the full development lifecycle.
• 4 years’ experience with tools to include Ansible, Terraform, JMETER, EC2, ELB, RDS, Lambda, Docker.
• Experience with deployment orchestration, automation, and security configuration management (i.e., CloudFormation, Terraform, Ansible, GitLab, Bitbucket).

PREFERRED QUALIFICATIONS

• Prior experience with DISA and DISA’s support to mission partners.

ABOUT OUR PROGRAM

With the CESO effort, the Defense Information System Agency (DISA) is looking to transform the existing Secure Web Services (SWS) environment, used to provide secure information sharing to the community, into a more mature service offering to meet the DoD and IC community. The program will support an automated platform capable of supporting a rapidly expanding customer population.

PAY RANGE

Pay Range $107,900.00 - $195,050.00 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.

PAY AND BENEFITS

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available on the Leidos careers website.

COMMITMENT TO NON‑DISCRIMINATION

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.