Sr. UI Engineer

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Mantech seeks a motivated, career-driven, and customer-focused Sr. UI Engineer to join our team in Hanover, MD.

This position will play a key part in building secure, scalable, and mission-enabling applications that support enterprise infrastructure capabilities for a global workforce. This role requires hands-on expertise in both front-end and back-end development, as well as knowledge of infrastructure and DevOps tools in a secure enterprise environment.

Responsibilities include, but are not limited to:

• Act as a senior technical consultant delivering expert guidance on full-stack technologies and modern development practices
• Design and develop responsive user interfaces and rich browser applications using modern UI frameworks and design patterns
• Prototype, test, and iterate UI/UX solutions based on user research, journey mapping, and usability principles
• Build scalable backend services and APIs using Java and Spring Boot
• Support containerized deployments using Docker, and manage builds with Maven
• Implement and manage GitOps pipelines with Flux and Kustomize for Kubernetes-based environments
• Integrate services using REST APIs and manage infrastructure using Helm, Kudectl, and Rancher
• Leverage tools such as Git/GitLab, Jira, and Confluence for agile collaboration and tracking
• Develop in Linux environments using scripting languages like Python and tools like IntelliJ IDEA

Minimum Qualifications:

• Bachelor's degree with 12+ years of relevant experience OR associate's degree with 15 years of relevant experience OR high school diploma/GED with 20 years of relevant experience
• Experience with Java, Spring Boot, and Maven for backend development
• Experience with React, TypeScript, Material UI (MUI), Cypress, Vitest, or Vite for UI development
• Experience with Docker, RESTful APIs, and GitOps workflows
• Experience with maintaining and modernizing AWS platforms
• Strong scripting skills in Python and familiarity with Linux-based development
• IAT I certification (DoD 8140 required within 60 days of starting employment. Acceptable certifications include A+ CE/CCNA-Security/CND/Network+ CE /CySA+/GICSP/GSEC/Security+ CE/CND/SSCP)

Preferred Qualifications:

• Experience with MongoDB
• Experience with Mattemost/HUSTLE
• Experience with Kubernetes, Helm, Rancher, Flux, and Kudectl in secure DevOps environments
• Hands-on experience with JIRA, Confluence, IDEA IDE, and CI/CD pipeline tools such as Git/GitLab

Clearance Requirements:

• Must have a current/active TS/SCI with Polygraph

Physical Requirements:

• Must be able to remain in a stationary position 50% of the time
• Occasionally moves about inside the office to access file cabinets, office machinery, etc.
• Frequently communicates with co-workers, management, and customers via email, phone, and virtual tools, which may include delivering presentations. Must be able to exchange accurate information in these situations

The projected compensation range for this position is $175,800.00-$312,200.00. There are differentiating factors that can impact a final salary/hourly rate, including but not limited to, Contract Wage Determination, relevant work experience, skills and competencies that align to the specified role, geographic location (For Remote Opportunities), education and certifications as well as Federal Government Contract Labor categories. In addition, MANTECH invests in its employees beyond just compensation. MANTECH's benefits offerings include, dependent upon position, Health Insurance, Life Insurance, Paid Time Off, Holiday Pay, short-term and long-term Disability, Retirement and Savings, Learning and Development opportunities, wellness programs as well as other optional benefit elections.

MANTECH International Corporation considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation. If you need a reasonable accommodation to apply for a position with MANTECH, please email us at and provide your name and contact information.