Mid Level Frontend Developer Jobs in Manassas, VA

Amentum is searching for a Front-End Developer to join our team in Arlington, VA. You will be working in support of a DoW Special Programs customer developing a new application in AWS GovCloud. The mission is to modernize and sustain a secure, web-based platform that consolidates critical government workflows, enabling automated data management, role-based access control, and multi-level security capabilities in support of national security operations.
Work Schedule:
Work is typically performed, Monday through Friday 8-hour days onsite. Flexibility within a 2-week pay period to reach 80 hours.
Essential Responsibilities:
The Front-End Developer is responsible for

• Develop and maintain scalable, high-performance web applications using modern front-end frameworks.
• Collaborate with UX/UI developers and back-end developers to deliver seamless user experiences.
• Translate design mockups and wireframes into clean, efficient code.
• Optimize applications for maximum speed, scalability, and accessibility.
• Implement responsive designs that work across various devices and screen sizes.
• Ensure cross-browser compatibility and maintain code quality through testing and reviews.
• Stay current with emerging technologies and propose improvements to existing systems.

Work Environment, Physical Demands, and Mental Demands:
Office environment with no unusual hazards, occasional lifting to 50 pounds, constant sitting while using the computer terminal, constant use of sight abilities while reviewing documents, constant use of speech/hearing abilities for communication, constant mental alertness, must possess planning/organizing skills, and must be able to work under deadlines.
Minimum Requirements (Knowledge, Skills, and Abilities):
Minimum of 5 years of experience collectively with the following:

• Proficiency in HTML5, CSS3, JavaScript, and TypeScript.
• Experience with modern frameworks/libraries such as Angular, React, or Vue.js.
• Familiarity with RESTful APIs and asynchronous request handling.
• Understanding of version control systems (e.g., Git).
• Strong attention to detail and a passion for clean, maintainable code.
• Exposure to Agile development environments.

Security Clearance Required: TS/SCI - This position requires an active DoD TS/SCI security clearance that has been adjudicated in the last 5 years or designated CE and the ability to obtain and maintain special accesses.
Minimum Education: Bachelor's degree in information systems engineering, Computer Science, Engineering, Business, or other related fields. In absence of degree, additional years of experience may be substituted for educational requirements
Minimum Years of Experience:5-8 Years
Required Certifications:

• AWS Solutions Architect - Associate (minimum); Professional preferred
• AWS SysOps Administrator - Associate or AWS DevOps Engineer - Professional
• Security+ CE

Preferred Qualifications:

• Experience supporting a DoW ATO or FedRAMP authorization process
• Familiarity with DISA STIG compliance requirements and implementation
• Experience operating PostgreSQL on Amazon RDS including patching coordination and backup/restore validation
• Experience with Keycloak or equivalent OIDC/SAML identity provider integration in a GovCloud environment
• AWS Security- Specialty certification
• Git, GitLab, Terraform, Splunk, HashiCorp Vault, JIRA, Jenkins, Ansible
• Amazon Web Services GovCloud
• Microsoft Windows Server and Linux
• AWS Associate level or above certification

Preferred Certifications:

• AWS Security - Specialty.
• ITIL Foundation.

Other Responsibilities:
Safety - Amentum enforces a safety culture whereby all employees have the responsibility for continuously developing and maintaining a safe work environment. As appropriate, each employee is responsible for completing all training requirements and fulfilling all self-aid/buddy aid responsibilities, participating in emergency response tasks and serving on safety committees and teams.
Quality - Quality is the foundation for the management of our business and the keystone to our goal of customer satisfaction. It is our policy to consistently provide services that meet customer expectations. Accordingly, each employee must conform to the Amentum Quality Policy and carry out job activities in compliance with applicable Amentum Quality System documents and customer contracts. Each employee must read and understand his/her Quality Management and Customer Satisfaction responsibilities.
Procedure Compliance - Each employee must read, understand and implement the general and specific operational, safety, quality and environmental requirements of all plans, procedures and policies pertaining to his/her job. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability or protected veteran status.
#javelin
Compensation Details:
$130,000 - $145,000
The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws.
Benefits Overview:
Our health and welfare benefits are designed to support you and your priorities. Offerings include:

• Health, dental, and vision insurance
• Paid time off and holidays
• Retirement benefits (including 401(k) matching)
• Educational reimbursement
• Parental leave
• Employee stock purchase plan
• Tax-saving options
• Disability and life insurance
• Pet insurance

Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.
Original Posting:
06/08/2026 - Until Filled
Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs.
Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters.