React Software Developer - Hybrid

Castello Systems, Inc.; Corridor North (MD); Hybrid; USD 90,000 - 130,000; Full time

Benefits offered by this job

Telework up to 1 day per week

Job summary

Castello Systems, Inc. is seeking a Software Engineer to maintain and enhance a React-based front-end for a DoD–Industry collaboration application. You will develop, test, and deploy UI improvements while ensuring performance and reliability in a production environment.

You will work with government stakeholders to prioritize enhancements, translate feedback into scalable UI solutions, and integrate with backend services and APIs. Telework up to one day per week is available.

Qualifications

• Experience developing production-grade React front-ends.
• Experience with TypeScript, modern JS, and UI/UX best practices.
• Ability to translate user feedback into scalable UI components.
• Knowledge of Agile planning and sprint ceremonies.

Responsibilities

• Maintain and enhance a production React app for DoD and Industry Partners.
• Develop, test, and implement UI enhancements while ensuring stability and performance.
• Troubleshoot issues, analyze root causes, and implement fixes.
• Collaborate with government stakeholders to gather needs and prioritize enhancements.
• Translate feedback into scalable, maintainable front-end solutions.
• Maintain React UIs for registration, tracking, workflow, reporting, and more.
• Collaborate with cross-functional teams to evaluate changes and support releases.
• Integrate front-end with back-end services and APIs.
• Apply modern front-end practices using React/TS/HTML/CSS.
• Support Agile planning, backlog refinement, and releases.
• Work independently in a fast-paced environment, balancing support and development.
• Telework up to one day per week is offered.

Skills

React

JavaScript/TypeScript

HTML/CSS

Frontend development

Agile methodologies

Tools

RESTful APIs

Job description

DCAT: Software Engineer

Opened: 10/13/2026

• Serve as the primary React Software Developer responsible for maintaining and enhancing a production collaboration and business process application that supports information exchange between DoD and Industry Partners.
• Develop, test, and implement application enhancements, bug fixes, and usability improvements while ensuring the stability, reliability, and performance of the production environment.
• Support ongoing operations and maintenance activities, including troubleshooting application issues, analyzing root causes, and implementing corrective actions.
• Collaborate with government stakeholders to understand operational needs, prioritize enhancement requests, refine requirements, and provide technical recommendations for future improvements.
• Translate user feedback and evolving business requirements into scalable, maintainable front-end solutions that improve functionality and user experience.
• Maintain and enhance React-based user interfaces supporting registration, tracking, workflow management, reporting, and other mission-critical business processes.
• Work closely with system engineers, developers, testers, and product stakeholders to evaluate change requests, support releases, and ensure successful deployment of enhancements.
• Integrate front-end components with backend services and APIs, ensuring secure, reliable, and efficient data exchange across systems.
• Apply modern front-end development practices using React, JavaScript/TypeScript, HTML, CSS, and component-based design patterns to maintain a high-quality user experience.
• Support Agile planning activities, including backlog refinement, sprint planning, estimation, and release preparation for operational enhancements and defect remediation.
• Operate independently in a fast-paced environment, managing priorities and balancing production support activities with enhancement development efforts.

• Telework up to one day per week is offered for this effort.