Senior Software Development Engineer Jobs in Washington, DC

Unissant, Inc. delivers innovative capabilities to the agencies that keep our nation healthy and safe. We apply our domain expertise, data acumen, and technology know-how to achieve breakthrough results for our clients. Working collaboratively, we advance missions and careers through a focus on honesty, integrity, and dependability. We continuously look for talent, excited to join that effort. To learn more about our exciting organization, please visit us at www.unissant.com.

Unissant is seeking a Web Software Developer to support a newly awarded program for a federal health agency. Develop and maintain accessible web application interfaces and supporting components for agency customers and business users.

The ideal candidate brings practical delivery experience, sound judgment, and a collaborative approach to maintaining Federal business applications while improving technical capability.

Essential Duties and Responsibilities:

• Implement approved web pages, application features, reusable components, and integration with backend services.
• Translate requirements and design guidance into responsive interfaces that work across supported browsers and devices.
• Apply accessible HTML structure, keyboard behavior, form validation, and other Section 508 design practices.
• Develop and maintain unit and interface tests; support regression, browser, and accessibility testing.
• Troubleshoot display, behavior, performance, and data integration issues with analysts and engineers.
• Maintain source code and configuration under review and address security and code-quality findings.
• Support controlled deployments, release documentation, user feedback, and ongoing maintenance of assigned sites.
• Support transition knowledge transfer and maintain current technical or process documentation for assigned responsibilities.
• Coordinate assigned work with program leadership, Government stakeholders, and related teams; report blockers and dependencies promptly.
• Use Government-approved tools and handle program data within authorized environments. Validate any AI-assisted output before it informs delivery decisions.

Work Experience and Job Skills:

Basic Qualifications:

• Minimum 7 years of experience developing and maintaining web application interfaces using HTML, CSS, and JavaScript or an assigned framework.
• Ability to integrate web interfaces with backend services and handle data validation and error states.
• Understanding of responsive design, browser compatibility, and accessible interaction patterns.
• Experience debugging browser behavior and application performance issues.
• Experience with version control, peer review, automated testing, and secure web development.
• Ability to collaborate with content owners, designers, analysts, and backend engineers.
• Ability to document work clearly, protect sensitive program information, and collaborate across Government and contractor teams.
• Ability to meet federal suitability and access requirements and provide on-site support in the Bethesda, Maryland area as directed.

Additional Qualifications:

• Experience with Drupal-based sites or the assigned Java/.NET web environment.
• Federal Section 508 remediation and accessible form development experience.
• Experience with reusable components, automated builds, and approved AI-assisted coding with human review.
• Experience supporting a Federal IT services environment, preferably within a federal health agency or comparable federal IT environment.
• Experience transferring knowledge from an incumbent team and maintaining reliable services during transition.

Education:

• A degree or relevant coursework in computer science, information systems, engineering, or a related discipline is preferred.

Certificates, Licenses and Registrations:

• Relevant web development, CMS, or accessibility credentials are preferred.

Communication Skills:

• Clear verbal and written communication skills, with the ability to coordinate professionally across Government, prime contractor, and subcontractor teams.
• Ability to explain role-specific findings, document decisions and procedures, and communicate risks and recommended actions to the appropriate audience.

Clearance Requirements:

• Must hold or be eligible for a Public Trust Moderate (Tier 2) background investigation and meet applicable federal suitability, badging, and system-access requirements.

Travel:

• Washington, DC.

Environmental Requirements:

• Mainly a routine office environment.
• May be required to lift up to ten (10) pounds
• Flexible in working extended hours

The above statements are intended to describe the general nature and level of work being performed by the individual(s) assigned to this position. They are not intended to be an exhaustive list of all duties, responsibilities, and skills required. Unissant management reserves the right to modify, add, or remove duties and to assign other duties as necessary. In addition, where applicable and available, reasonable accommodation(s) may be made to enable individuals with disabilities to perform essential functions of this position.

Candidate(s) will be required to go through pre-employment screening.

Unissant, Inc. is a proud Equal Opportunity Employer! (EOE; M/F/Disability/Vets)