Sr. Full Stack UI/UX Software Engineer

Socket.dev; Washington (District of Columbia); On-site; USD 140,000 - 180,000; Full time

Job summary

CSSI LLC in Washington, DC seeks a Senior Full UI/UX Stack Software Engineer to design, develop, modernize, and maintain mission-critical applications for transportation and safety programs.

The role requires strong front-end, cloud, and integration expertise, plus experience with Agile development and production systems support. Join a team delivering scalable solutions and impactful public safety outcomes.

Qualifications

• Bachelor's degree in Computer Science, Software Engineering, Information Systems, or related discipline.
• Minimum of 8 years of professional software development experience.
• Minimum of 5 years of experience developing modern web applications.
• Experience working throughout the Software Development Lifecycle (SDLC).
• Experience supporting production systems and enterprise applications.
• Experience working in Agile/Scrum development environments.
• U.S. Citizen or Green Card Permanent Resident (minimum3+ years of U.S. residency) and Public Trust approval

Responsibilities

• Design, develop, test, and deploy full-stack software solutions supporting mission and operational objectives.
• Develop and maintain cloud-native applications utilizing AWS services.
• Build and enhance APIs, and web-based user interfaces.
• Collaborate with program managers, engineers, analysts, and stakeholders to translate business requirements into technical solutions.
• Support application modernization and cloud migration initiatives.
• Implement software engineering best practices, including code reviews, automated testing, and CI/CD pipelines.
• Troubleshoot production issues and provide technical support for deployed systems.
• Participate in Agile ceremonies, sprint planning, and development reviews.
• Develop technical documentation, architectural diagrams, and implementation plans.

Skills

React

Angular

JavaScript/TypeScript

HTML5

CSS3

Responsive UI

Data visualization

Visualization tools integration

GitHub Actions

CI/CD pipelines

Unit testing

Education

Bachelor's degree in Computer Science or related field

Tools

AWS

AWS Lambda

CloudFormation

DynamoDB

S3

Tableau

Job description

CSSI is seeking a highly skilled Senior Full UI/UX Stack Software Engineer to support the design, development, modernization, integration, and maintenance of mission-critical applications supporting transportation and operational safety programs. The successful candidate will leverage modern web technologies, cloud-native architectures, and software engineering best practices to develop scalable solutions that enhance operational performance and decision-making. The role requires strong experience across front-end development, cloud platforms, application integration, and Agile software development.

Minimum Qualifications

• Bachelor's degree in Computer Science, Software Engineering, Information Systems, or a related technical discipline.
• Minimum of 8 years of professional software development experience.
• Minimum of 5 years of experience developing modern web applications.
• Experience working throughout the Software Development Lifecycle (SDLC).
• Experience supporting production systems and enterprise applications.
• Experience working in Agile/Scrum development environments.
• U.S. Citizen or Green Card Permanent Resident (minimum3+ years of U.S. residency) and Public Trust approval

Required Technical Skills

Front End Development

• Experience developing web applications using React, Angular, JavaScript/TypeScript, HTML5, FIGMA and CSS3.
• Experience building responsive user interfaces and reusable components.
• Experience integrating visualization and reporting tools into web applications.

Cloud and DevOps

• Experience designing and deploying applications within AWS environments.
• Experience with AWS Lambda, CloudFormation, DynamoDB, S3, CI/CD pipelines, and GitHub Actions.
• Experience automating software deployments and system operations.

Software Engineering

• Object-oriented design and development.
• Data structures and design patterns.
• Unit testing and Test-Driven Development (TDD).
• Code reviews and Continuous Integration/Continuous Delivery (CI/CD).
• Application performance optimization and troubleshooting.

Preferred Qualifications

• AWS Developer Associate certification.
• AWS Solutions Architect certification.
• AWS DevOps certification.
• Experience with enterprise modernization initiatives.
• Experience supporting transportation, aviation, federal government, or safety-related systems.
• Experience with Tableau integration and data visualization platforms.

Key Responsibilities

• Design, develop, test, and deploy full-stack software solutions supporting mission and operational objectives.
• Develop and maintain cloud-native applications utilizing AWS services.
• Build and enhance APIs, and web-based user interfaces.
• Collaborate with program managers, engineers, analysts, and stakeholders to translate business requirements into technical solutions.
• Support application modernization and cloud migration initiatives.
• Implement software engineering best practices, including code reviews, automated testing, and CI/CD pipelines.
• Troubleshoot production issues and provide technical support for deployed systems.
• Participate in Agile ceremonies, sprint planning, and development reviews.
• Develop technical documentation, architectural diagrams, and implementation plans.

Desired Competencies

• Strong analytical and problem-solving skills.
• Ability to communicate technical concepts to both technical and non-technical audiences.
• Ability to work independently and within multidisciplinary teams.
• Strong customer engagement and collaboration skills.
• Commitment to quality, continuous improvement, and innovation.

About CSSI

CSSI, LLC., has 30 years of experience working in complex, dynamic, safety critical systems supporting both government and commercial clients to address their toughest challenges, with efficient and low-risk solutions. Our collaborative work has improved the safety of transportation related human and systems infrastructure, increased the efficiency of the National Airspace System (NAS), and facilitated the modernization of both NAS and DoD systems and capabilities. Founded in 1990 and headquartered in Washington, D.C., CSSI employs nearly 200 employees throughout the country, helping customers across the United States and globally understand and implement the solutions to their biggest obstacles. For more information on CSSI, please visit www.cssiinc.com.