Design Jobs in Belleville, IL

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1mo ago

Senior UI/UX & API Developer

D&G Support Services, LLC Belleville, IL

Belleville, IL

1mo ago Closed

Full time Backend Developer Senior Accessibility

This position is no longer accepting applications (closed Oct 24, 2026).

Job Description

D&G Support Services, LLC is hiring a Senior UI/UX & API Developer to support application modernization tied to the IGC Contract. This role helps deliver secure, responsive, and accessible web experiences along with RESTful APIs in a hybrid Agile DevSecOps environment, with work designed to align to Section 508 requirements.

The position is based in Belleville, IL (hybrid) and supports development, testing, and sustainment across front-end and back-end capabilities. Active Secret clearance and U.S. person eligibility are required.

Responsibilities

Design, develop, test, and sustain secure, responsive, accessible web applications and reusable front-end components using JavaScript/TypeScript, HTML, CSS, and frameworks such as React, Angular, or comparable technologies.
Convert mission workflows and user requirements into intuitive interfaces, user flows, wireframes, prototypes, reusable components, and accessible experiences that support applicable Section 508 requirements.
Build and maintain RESTful APIs, web services, microservices, and integration components using Java, C#, Python, or comparable technologies, including API contracts, data models, validation rules, error handling, versioning, and interface documentation.
Integrate applications and APIs with relational databases, data services, analytics platforms, and existing enterprise interfaces while maintaining business rules and data integrity.
Implement secure authentication, authorization, role-based access, input validation, logging, auditing, and other application-security controls; troubleshoot API, integration, performance, data-mapping, and connectivity issues.
Create unit, API, integration, accessibility, and automated regression tests, and support build, testing, security validation, and deployment activities through GitLab CI/CD processes.
Participate in Agile delivery activities, including requirements refinement, sprint planning, demonstrations, GVT/GAT, release readiness, production support, and defect resolution.
Provide technical leadership through design and code reviews, mentoring, documentation, technical-debt identification, and collaboration with developers, architects, data engineers, DevSecOps, cybersecurity personnel, testers, Product Owners, functional analysts, and Government stakeholders.

Requirements

Eight (8) or more years of professional software-development experience, including complex enterprise web applications and system integrations.
Hands-on experience with JavaScript/TypeScript, HTML, CSS, and modern front-end frameworks such as React, Angular, or comparable technologies.
Experience translating functional requirements and user workflows into production-ready interfaces, reusable components, and practical UX designs.
Experience developing RESTful APIs, web services, microservices, and enterprise integrations using Java, C#, Python, or comparable technologies, including API contracts and documentation using OpenAPI/Swagger or similar approaches.
Working knowledge of relational databases, SQL, data-access patterns, and application-to-database integration.
Experience with Git, CI/CD, automated testing, secure coding, authentication/authorization, input validation, and application-security practices.
Experience developing accessible enterprise or federal web applications, including applicable Section 508 requirements.
Bachelor’s or Master’s degree in Computer Science, Cybersecurity, Data Science, Software Engineering, Information Technology, Information Systems, or a related software-engineering discipline; or one of the following certifications: FITSP-D, GCSA, GISF, or SSCP.
Strong technical leadership, troubleshooting, design-review, mentoring, documentation, and stakeholder-communication skills.

Technologies

JavaScript, TypeScript, HTML, CSS, React, Angular
Java, C#, Python
RESTful APIs, microservices, OpenAPI/Swagger
SQL, Git, GitLab CI/CD
Section 508

Benefits

Competitive salary
Comprehensive benefits
401(k)
Bonus and profit sharing
Flexible hours
Education reimbursement
Generous paid time off

Preferred

Experience supporting U.S. Transportation Command, Department of Defense logistics, or another mission-critical federal system.
Experience modernizing legacy enterprise user interfaces and web services while maintaining operational continuity.
Experience with UX design and prototyping tools such as Figma, Adobe XD, Sketch, or comparable products.
Experience with enterprise identity and access management, single sign-on, and role-based access-control patterns.
Experience integrating applications with business-intelligence or analytics platforms such as Apache Superset.
Familiarity with Oracle, PostgreSQL, Amazon Aurora, Amazon RDS, or comparable relational databases.
Familiarity with containerized and AWS-hosted environments, DevSecOps practices, DoD Risk Management Framework, and STIG/SRG requirements.

Clearance and Eligibility

Active Secret security clearance or the ability to obtain and maintain one, as required by assigned duties and contract requirements.
Restricted to U.S. person(s) (U.S. citizens, permanent residents, and other protected individuals under 8 U.S.C. 1324b(a)(3)).

Location

Hybrid
Remote work may be authorized consistent with program requirements.
Personnel must be available for required on-site meetings, user-engagement activities, testing, demonstrations, release activities, classified-system access, or other assigned mission needs at Scott Air Force Base, Illinois.

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