Software Engineer II

Amentum; Helena (MT); Remote; USD 97,000 - 121,000; Full time

Benefits offered by this job

Health insurance

401(k) matching

Parental leave

Educational reimbursement

Job summary

Amentum is seeking a Software Engineer II to deliver full stack development using C#, ReactJS, MVC, Linq, and REST API on the .NET Core platform. This US remote telework role requires US citizenship and offers a comprehensive benefits package.

You will design, develop, and support software across is systems while collaborating with cross-functional teams. Minimum 3 years of C#/.NET experience with MVC and REST API; ReactJS experience preferred.

Qualifications

• 3 years of C#/.NET development with MVC and REST APIs.
• US Citizenship and ability to pass Security Clearance.
• Experience with ReactJS preferred.

Responsibilities

• Design, develop, troubleshoot software for computer-based systems.
• Ensure automated data feeds and system interfaces work as intended.
• Participate in design reviews and software acceptance processes.
• Design, write, test, deploy and support software code.
• Travel up to 5%.

Skills

C#

ReactJS

MVC

Linq

REST API

Education

Bachelor's degree

Tools

SQL Server

Job description

Amentum is a global leader in advanced engineering and innovative technology solutions, trusted by the United States and its allies to address their most significant and complex challenges in science, security and sustainability. Headquartered in Chantilly, Virginia, we have approximately 50,000 employees in more than 70 countries across all 7 continents.

The Software Engineer II will perform full stack development with C# program, ReactJS, MVC, Linq, and rest API development in NET Core platform. This position is US remote teleworking within the US and US Citizenship is required.

Essential Responsibilities:

• Under general supervision, design, develop, troubleshoot, and analyze software programs for computer-based systems
• Ensure automated data feeds and system interfaces are working as intended
• Participate in software requirements review, preliminary and critical design reviews, integration readiness review, and software acceptance reviews
• Design, write, test, deploy and support software code, as assigned
• Perform software upgrades in accordance with software quality procedures
• Frequent inter-organizational and outside customer contacts on technical matters
• Support Continuous Improvement efforts intended to improve the quality of existing software
• Design and implement new or existing standard software application programs and reports according to project software standards and conventions
• Perform other duties as assigned

Knowledge, Skills and Abilities:

• Deep understanding of relational databases and Microsoft SQL Server (T-SQL)
• Strong knowledge of Model-View-Controller (MVC), Linq Query, and rest API development
• Ability to build robust, maintainable web applications and services
• Excellent communications and analytical skills required
• Good Planning/organizing skills
• Ability to prioritize and adapt to dynamic changes in the environment
• Must be able to work under deadlines
• Position may require travel 5%

Minimum Education and Experience Required:

• Typically, 3 years of C# program experience with .NET technology, MVC, Linq, and rest API development with a Bachelor’s degree in a related technical discipline (e.g., BSEE, BSCS) or equivalent in Computer Science or related field
• ReactJS programming experience preferred
• Position may require the ability to pass and maintain a Security Clearance
• US Citizenship is required.

Compensation Details:

$97k - $121k

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:

09/29/2026 - 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 (https://postings.govdocs.com/#/vxSkbztPuAwwxfs) .