Systems Architect Senior

PAE Government Services Inc.; Washington (District of Columbia); On-site; USD 185,000 - 190,000; Full time

Benefits offered by this job

Health, dental, and vision insurance

401(k) matching

Educational reimbursement

Job summary

Amentum seeks a Senior Systems Architect to lead design, development, and deployment of enterprise applications for government IT missions. You will drive architecture across the SDLC, collaborating with engineers and users to create scalable, secure solutions.

The role requires TS SCI with Poly and 9+ years of architecture experience, with hands-on work in C#, Java, JavaScript, CSS, MVC, .NET, SQL, and TFS. Competitive benefits and ongoing professional growth are provided.

Qualifications

• Bachelor’s degree in Computer Science, Engineering, Information Technology, or related field.

Responsibilities

• Lead architectural design and development efforts for enterprise-level applications using C#, Java, JavaScript, CSS, MVC, .NET, and SQL.
• Coordinate with cross-functional teams to gather, analyze, and define system requirements that align with customer missions and long-term goals.
• Design and implement scalable, maintainable solutions leveraging T-SQL, JavaScript frameworks, and scripting languages, while ensuring code structure follows best practices.
• Oversee development workflows in TFS and ensure proper source control, build, and release processes are followed.
• Perform system integration and prototype emerging technologies to support innovation and future-proof existing infrastructures.
• Write, review, and maintain comprehensive technical documentation, including architecture diagrams, data flow models, and test plans.
• Stay up-to-date on industry trends and emerging technologies, recommending tools and approaches that improve development processes and system performance.
• Troubleshoot complex technical issues quickly and effectively, applying strong problem-solving and decision-making skills.
• Mentor junior developers and engineers, providing code reviews, architectural guidance, and technical leadership.
• Coordinate and prioritize multiple ongoing projects and tasks to meet deadlines in a high-pressure, mission-driven environment.
• Collaborate with business analysts, developers, and senior leadership, ensuring solutions meet performance, security, and usability standards.

Skills

C#

Java

JavaScript

CSS

MVC

.NET

SQL

T-SQL

Angular

React

Vue

Education

Bachelor’s degree in Computer Science, Engineering, Information Technology, or related field

Tools

TFS

AWS

Azure

Google Cloud

Job description

Purpose and Impact

Are you ready to launch your career where your code truly matters? At Amentum, we’re building more than just software — we’re delivering mission- critical solutions that shape the future. We’re looking for a Senior Level Front-End Developer to join our dynamic team and help us create powerful, intuitive interfaces that drive real- world results. As part of our agile and tight- knit development team, you’ll collaborate directly with system engineers and users to design and build clean, responsive, and high- performance front- end solutions. You'll work with modern tools — HTML, CSS, JavaScript — and have the opportunity to grow your skills in a fast- paced, mission- driven environment. This isn’t just another job — it’s a chance to be part of a company where your contributions directly support national security, technological innovation, and the future of digital transformation. We’re passionate about what we do, and we’re looking for developers who share that passion — self- starters who love learning, problem- solving, and being part of something bigger than themselves. If you're looking for a place where your work has real meaning, your team supports you, and your career can thrive — we’d love to hear from you.

Work Schedule

8 hours 5 days a week within the hours of 6:00am – 6:00pm

Essential Responsibilities

As a Senior Systems Architect at Amentum, you’ll be at the forefront of designing, developing, and deploying sophisticated enterprise applications in support of government IT missions. You’ll lead efforts across the full software development lifecycle while applying advanced technical knowledge and strategic insight to create systems that are efficient, secure, and scalable.

Your day-to-day responsibilities will include:

• Lead architectural design and development efforts for enterprise- level applications using technologies including C#, Java, JavaScript, CSS, MVC, .NET, and SQL.
• Coordinate with cross-functional teams to gather, analyze, and define system requirements that align with customer missions and long- term goals.
• Design and implement scalable, maintainable solutions leveraging T- SQL, JavaScript frameworks, and scripting languages, while ensuring code structure follows best practices.
• Oversee development workflows in Team Foundation Server (TFS) and ensure proper source control, build, and release processes are followed.
• Perform system integration and prototype emerging technologies to support innovation and future- proof existing infrastructures.
• Write, review, and maintain comprehensive technical documentation, including architecture diagrams, data flow models, and test plans.
• Stay up-to-date on industry trends and emerging technologies, recommending tools and approaches that improve development processes and system performance.
• Troubleshoot complex technical issues quickly and effectively, applying strong problem- solving and decision- making skills.
• Mentor junior developers and engineers, providing code reviews, architectural guidance, and technical leadership.
• Coordinate and prioritize multiple ongoing projects and tasks to meet deadlines in a high- pressure,mission- driven environment.
• Collaborate with business analysts, developers, and senior leadership, ensuring solutions meetperformance, security, and usability standards.
• Communicate effectively across technical and non- technical audiences to align project goals, timelines,and deliverables.

Minimum Requirements (Knowledge, Skills, and Abilities)

• Bachelor’s degree in Computer Science, Engineering, Information Technology, or a related field.
• 9+ years of experience in systems architecture, software development, or enterprise IT design.
• Which at least seven (7) years specialized experience.
• Proven expertise in full software development lifecycle (SDLC), with hands- on experience in analysis, coding, testing, documentation, and system acceptance.
• Demonstrated knowledge of government IT systems, standards, and security frameworks.
• Proficiency in multiple programming languages and technologies, including: C# Java JavaScript CSS .NET Framework MVC architecture T- SQL / SQL JavaScript Frameworks (e.g., Angular, React, Vue).
• Strong understanding of system design, prototyping, and technology evaluation to support mission objectives and enterprise scalability.
• Experience conducting requirements gathering, functional analysis, and cost- benefit assessments for large- scale IT solutions.
• Ability to develop and maintain technical documentation, system diagrams, and architecture reports.
• Excellent communication and interpersonal skills, including the ability to interface with technical teams and non- technical stakeholders.

Security Clearance Required

TS SCI with Poly

Minimum Education

Bachelor’s Degree in Computer Science, Information Systems, Engineering, Business Minimum Years of Experience: Related discipline with nine (9) years of which at least seven (7) years specialized experience.

Required Certifications

• IAM1 8570 Compliance (Security +)

Preferred Qualifications

• Prior experience supporting DOD or other federal government agencies.
• Familiarity with Team Foundation Server (TFS) and version control best practices.
• Knowledge of cloud platforms and services, such as AWS, Azure, or Google Cloud.
• Experience with Agile or DevSecOps methodologies in a systems development context.
• Certifications such as:
• TOGAF (The Open Group Architecture Framework)
• Microsoft Certified: Azure Solutions Architect Expert
• AWS Certified Solutions Architect – Associate/Professional
• Security+ Certification
• Ability to lead and mentor multidisciplinary technical teams.

#javelin

This position is not designated as a safety sensitive position. As part of our commitment to maintaining a safe and compliant work environment, Amentum is a drug- free workplace and requires all personnel to comply with company drug and alcohol policies as a condition of employment. Employment is contingent upon successful completion of the drug screening process. Please note that this may include pre- hire screening for marijuana, as well as other federally controlled substances due to Amentum’s role as a federal contractor and trusted partner to the U.S. Government.

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.

Compensation Details

$185,000 - $190,000

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.

Original Posting

10/21/2026 - 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.

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Thank you for continued interest in employment with Amentum. For more than 100 years, Amentum has tackled the world’s toughest challenges to deliver agile and steadfast solutions to the U.S. government and its allies. With more than 50,000 employees on all seven continents and in more than 60 countries, Amentum delivers a broad range of operational support services to meet the critical needs of our clients.

Our headquarters are in Chantilly, VA.

Find us online at https://www.amentum.com/

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