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Senior Website Developer

Job

Knowesis

Arlington, VA (In Person)

Full-Time

Posted 03/10/2026 (Updated 7 weeks ago) • Actively hiring

Expires 5/27/2026

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Job Description

To be eligible for this position, candidates must have a Public Trust clearance and possess U.S. Citizenship without the need for sponsorship, both now and in the future. Applicants without proof of U.S. Citizenship will not be considered due to the position's security clearance requirements. The Job Duties and Responsibilities include but are not limited to the following: Design, code, test, and maintain websites and web applications for NSF, focusing on user interface (front-end), server-side functionality (back-end), or both (full-stack) development. Develop responsive, accessible, and user-friendly web interfaces that comply with Section 508 accessibility standards and the U.S. Web Design System (USWDS). Implement front-end development using HTML, CSS, JavaScript, and modern frameworks to create intuitive user experiences. Build and maintain back-end functionality, including server-side logic, database integration, and Application Programming Interfaces (APIs). Collaborate with User Experience (UX) designers, graphic designers, and content teams to translate design mockups and wireframes into functional web pages. Ensure all web products comply with federal requirements, including the Plain Writing Act of 2010, Section 508 compliance, and NSF branding guidelines. Conduct testing, debugging, and troubleshooting of web applications to ensure optimal performance across various browsers and devices. Integrate websites with Content Management Systems (CMS) such as Drupal, WordPress, or similar platforms. Implement Search Engine Optimization (SEO) best practices to improve website visibility and performance. Maintain and update existing websites by adding new features, updating content, fixing bugs, and resolving broken links. Collaborate with cross-functional teams, including OLPA staff, program officials, and stakeholders, to gather requirements and deliver solutions that meet organizational needs. Develop and maintain web analytics integration using tools such as Google Analytics and Google Tag Manager. Create technical documentation for developed solutions, including system architecture, code documentation, and user guides. Support website security measures and ensure data protection in accordance with federal standards. Participate in code reviews and adhere to version control best practices using systems such as Git.
Required Qualifications:
Minimum of 5 years of professional experience in website development and web application programming. Bachelor's degree in Computer Science, Information Technology, Web Development, or a related field (or equivalent combination of education and experience). Proficiency in front-end technologies including HTML5, CSS3, JavaScript, and modern JavaScript frameworks (React, Angular, Vue.js, or similar). Experience with back-end development languages and frameworks (PHP, Python, Ruby, Node.js, or similar). Demonstrated experience with responsive web design and mobile-first development approaches. Experience working with Content Management Systems (CMS), particularly Drupal, WordPress, or similar platforms. Strong understanding of web standards, cross-browser compatibility, and web accessibility (Section 508 and WCAG standards). Experience with database management systems (MySQL, PostgreSQL, MongoDB, or similar). Familiarity with RESTful APIs and web services integration. Proficiency in version control systems, particularly Git. Strong problem-solving skills and ability to troubleshoot technical issues independently. Excellent communication skills and ability to collaborate effectively with both technical and non-technical team members.
Preferred Qualifications:
Experience working with federal agencies or in government contracting environments. Familiarity with the U.S. Web Design System (USWDS) and federal digital strategy requirements. Experience with Agile development methodologies and project management tools (JIRA, Confluence, or similar). Knowledge of web security best practices and experience implementing secure web solutions. Certifications in web development, such as Certified Web Developer, AWS Certified Developer, or similar credentials. Experience with web performance optimization and analytics tools (Google Analytics, Google Tag Manager, etc.). Understanding of user-centered design principles and experience collaborating with UX/UI designers. Experience with DevOps practices and continuous integration/continuous deployment (CI/CD) pipelines. Familiarity with cloud platforms (Amazon Web Services, Microsoft Azure, Google Cloud Platform). Knowledge of Search Engine Optimization (SEO) and Answer Engine Optimization (AEO) principles.
Benefits:
Health (PPO & HDHP) Insurance, Dental, Vision, STD & LTD, Basic Life Insurance, 401k Company Match, & Voluntary Products. Knowesis is committed to providing equal employment opportunities to all individuals based on merit and qualifications. We prohibit discrimination in all aspects of employment as required by Title VII of the Civil Rights Act and other applicable federal laws. Our company values all applicants and employees and fosters a work environment where everyone is treated with respect and dignity. Equal Opportunity Employer This employer is required to notify all applicants of their rights pursuant to federal employment laws. For further information, please review the Know Your Rights notice from the Department of Labor.

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