User Interface (UI) Developer (junior/mid)

📍 Job Overview

Job Title: User Interface (UI) Developer (junior/mid)

Company: Closure Technologies

Location: Chantilly, Virginia, United States

Job Type: Full-time

Category: Software Development / Front-End Engineering

Date Posted: 2026-06-07

Experience Level: Junior to Mid-Level (2-5 years)

Remote Status: On-site

🚀 Role Summary

• Develop and maintain high-quality, user-friendly interfaces for a mission-critical messaging system, leveraging modern front-end technologies.

• Apply User Experience (UX) principles to ensure intuitive navigation and seamless interaction flows, directly impacting user adoption and system effectiveness.

• Contribute to product enhancements by implementing best practices within the Angular framework and upholding a consistent design system.

• Collaborate within a team of high-performing professionals supporting a global mission-critical system, requiring a strong focus on collaboration and communication.

• Utilize source code control systems and adhere to concurrent development workflows to ensure code integrity and efficient team collaboration.

📝 Enhancement Note: While the job title is "UI Developer," the responsibilities clearly indicate a front-end engineering focus, specifically within the Angular ecosystem. The emphasis on developing, testing, and maintaining interfaces for a "mission critical messaging system" suggests a need for robust, scalable, and secure front-end solutions. The "junior/mid" designation combined with the TS/SCI clearance requirement points to a role within a government contracting or defense sector, demanding a high level of trust and technical proficiency.

📈 Primary Responsibilities

• Design, develop, test, and maintain high-quality user interfaces using modern front-end technologies, ensuring responsiveness and cross-browser compatibility.

• Apply UX principles to ensure intuitive navigation and interaction flows, translating complex requirements into user-friendly interfaces.

• Contribute to product improvements by implementing modern Angular best practices, focusing on performance, maintainability, and scalability.

• Support and evolve a consistent design system to ensure a cohesive and professional user experience across the messaging system.

• Write clean, maintainable, and well-documented code, adhering to coding standards and best practices for long-term project sustainability.

• Participate actively in code reviews, providing constructive feedback to peers and incorporating feedback to enhance code quality.

• Collaborate closely with UX/UI designers, back-end developers, and product managers to translate requirements into functional and visually appealing user interfaces.

• Troubleshoot and debug front-end issues, identifying root causes and implementing effective solutions in a timely manner.

📝 Enhancement Note: The core responsibilities highlight a blend of core front-end development tasks with a strong emphasis on UX integration and adherence to modern development practices within the Angular framework. The mention of a "global mission critical messaging system" implies a need for high availability, security, and performance considerations in all UI development efforts.

🎓 Skills & Qualifications

Education:

• Bachelor of Science (B.S.) in Computer Science, Software Engineering, Information Management Systems, or a closely related technical discipline. Experience:

• Technical experience related to software design, development, and implementation targeting web browsers.

• Experience commensurate with a junior to mid-level developer, typically 2-5 years of professional front-end development experience. Required Skills:

• In-depth knowledge of the Angular framework and its core concepts (e.g., components, services, modules, RxJS).

• Proven experience implementing UI screens from prototypes, wireframes, or mock-ups, demonstrating the ability to translate design into functional code.

• Proficiency in modern front-end technologies such as HTML5, CSS3, and JavaScript/TypeScript.

• Experience with source code control systems (e.g., Git) and understanding of concurrent development workflows (e.g., branching, merging, pull requests).

• Ability to write clean, maintainable, well-documented, and efficient code.

• TS/SCI clearance with a polygraph is a mandatory requirement for this role. Desired Skills:

• Knowledge of web accessibility standards (e.g., WCAG) and experience implementing accessible interfaces.

• Experience supporting large software teams, understanding team dynamics and collaborative development processes.

• Familiarity with the Jasmine testing framework for unit testing Angular components and services.

• Experience with state management libraries or patterns within Angular applications.

• Understanding of build tools and module bundlers (e.g., Webpack, Angular CLI).

📝 Enhancement Note: The educational requirement is standard for software development roles, but the practical experience with Angular and translating designs into functional interfaces is key. The absolute requirement for a TS/SCI clearance with a polygraph is a critical filter and suggests the company operates in a sensitive sector, likely government or defense contracting.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase a minimum of 2-3 significant UI development projects, preferably built with Angular, that demonstrate your ability to translate wireframes and mock-ups into functional, polished interfaces.

• For each project, clearly articulate your role, the technologies used, and the specific UI/UX challenges you addressed.

• Include examples of responsive design implementation and how you ensured a consistent user experience across different devices and screen sizes.

• Demonstrate your approach to writing clean, maintainable, and well-documented code, potentially by providing links to public repositories (e.g., GitHub) or code snippets.

• Highlight projects where you applied UX principles to improve user flow, navigation, or overall usability. Process Documentation:

• Be prepared to discuss your personal development workflow, including how you approach problem-solving, debugging, and testing within an Angular environment.

• Articulate your understanding of source code control systems and concurrent development workflows, explaining how you manage code changes and collaborate with a team.

• You may be asked to describe your process for ensuring code quality, including adherence to coding standards and participation in code reviews.

📝 Enhancement Note: For a UI Developer, a portfolio is crucial. It needs to go beyond just showing finished products and demonstrate the candidate's thought process, technical skills in Angular, and understanding of UX principles. The emphasis on "mission critical" suggests a need for well-documented and robust code, so demonstrating this in the portfolio or through discussion of process is vital.

💵 Compensation & Benefits

Salary Range:

• Based on the location (Chantilly, Virginia), experience level (junior/mid, 2-5 years), and the mandatory TS/SCI clearance with polygraph, a competitive salary range for a UI Developer in this region is estimated to be between $80,000 - $120,000 per year.

• This estimate is derived from market data for similar roles in the Northern Virginia/DC metropolitan area, factoring in the premium often associated with cleared positions and specialized technical skills like Angular. Benefits:

• Comprehensive Health, Dental, and Vision Insurance: Covering medical needs with robust plans.

• Retirement Savings Plan (e.g., 401(k)): With potential company match to support long-term financial planning.

• Paid Time Off (PTO): Including vacation days, sick leave, and national holidays for work-life balance.

• Professional Development Opportunities: Support for training, certifications, and conferences relevant to UI development and Angular.

• Life Insurance and Disability Coverage: Providing financial security for employees and their families.

• Potential for Bonuses and Performance Incentives based on individual and company performance. Working Hours:

• Standard full-time work schedule, typically 40 hours per week.

• The role is on-site, implying a structured work schedule within the company's operational hours.

• Potential for some flexibility depending on team needs and project deadlines, but adherence to core business hours is expected.

📝 Enhancement Note: The salary range is an estimation based on industry benchmarks for UI Developers in the Chantilly, VA area, factoring in the significant value and demand for candidates holding TS/SCI clearances with polygraphs. This clearance often commands a salary premium due to the stringent vetting process and limited pool of qualified candidates.

🎯 Team & Company Context

🏢 Company Culture

Industry: Technology / Government Contracting / Defense Sector. Closure Technologies likely operates within sectors requiring high security and reliability, such as defense, intelligence, or critical infrastructure, given the TS/SCI clearance requirement.

Company Size: The specific size is not provided, but the need for a "team of high performing professionals" suggests a structured organization that values expertise and collaboration. Organizations supporting global mission-critical systems often range from mid-sized specialized firms to larger enterprises.

Founded: Founding date is not provided.

Team Structure:

• The UI Developer will be part of a team of "high performing professionals" supporting a "global mission critical messaging system." This implies a specialized team focused on delivering and maintaining critical software infrastructure.

• The team likely includes other developers (front-end, back-end), QA engineers, system administrators, and potentially project managers or technical leads.

• Collaboration will be key, with the UI Developer working closely with designers, other engineers, and potentially stakeholders who define the messaging system's requirements. Methodology:

• The team likely employs agile development methodologies (e.g., Scrum, Kanban) to manage the development lifecycle of the messaging system, emphasizing iterative development, continuous feedback, and rapid response to evolving requirements.

• A strong focus on code quality, testing, and security practices is expected, given the "mission critical" nature of the system.

• Emphasis on implementing modern Angular best practices suggests a commitment to staying current with front-end development trends and efficient coding techniques.

Company Website: https://job-boards.greenhouse.io/closure-tech (This is the job board URL, not the company's primary website.)

📝 Enhancement Note: The company's focus on a "global mission critical messaging system" and the requirement for a TS/SCI clearance strongly indicate a role within a government-related or highly secure private sector environment. This context implies a culture that values precision, security, reliability, and adherence to strict protocols.

📈 Career & Growth Analysis

Operations Career Level: This role is positioned as a Junior to Mid-Level UI Developer. It offers a solid foundation for a career in front-end development, with opportunities to specialize further in UI/UX, Angular development, or potentially move into lead or architect roles within specialized teams.

Reporting Structure: The UI Developer will likely report to a Front-End Lead, Engineering Manager, or a Technical Project Manager responsible for the messaging system's development. They will work within a team structure, collaborating with peers and potentially reporting to a senior developer or architect for technical guidance.

Operations Impact: The UI Developer's work directly impacts the usability, efficiency, and reliability of a mission-critical messaging system. By creating intuitive and robust interfaces, they enable users (likely other professionals or government personnel) to communicate effectively and perform their duties without hindrance, directly contributing to the system's overall success and the organization's objectives.

Growth Opportunities:

• Technical Specialization: Deepen expertise in Angular, explore advanced front-end frameworks, or specialize in areas like performance optimization, accessibility, or front-end architecture.

• Leadership Development: Progress to a Senior UI Developer role, mentor junior developers, or potentially take on team lead responsibilities for specific modules or projects.

• Cross-Functional Learning: Gain exposure to back-end technologies, cloud infrastructure, or DevOps practices, particularly relevant in a mission-critical environment.

• Security Clearance Advancement: For those with existing clearances, continued work in this sector can lead to opportunities for higher-level clearances or roles requiring more advanced security protocols.

📝 Enhancement Note: The role provides a clear path for growth within specialized front-end development, particularly within the secure government contracting sector. The emphasis on "mission critical" systems means that successful performance can lead to increased responsibility and opportunities for advancement, especially for those who can demonstrate reliability and technical prowess.

🌐 Work Environment

Office Type: On-site in Chantilly, Virginia. This indicates a traditional office setting where in-person collaboration and adherence to company policies are expected.

Office Location(s): Chantilly, Virginia, is part of the Northern Virginia tech corridor, known for its concentration of technology companies, government contractors, and federal agencies. This location offers access to a vibrant tech community and potentially convenient commuting options for residents in the surrounding areas.

Workspace Context:

• The work environment is expected to be professional and collaborative, with a focus on delivering high-quality software for a critical system.

• Access to modern development tools, workstations, and potentially specialized software or hardware relevant to the messaging system will be provided.

• Opportunities for direct interaction with team members, designers, and project stakeholders will be frequent, fostering a dynamic and communicative workspace.

• The secure nature of the work may also mean a controlled office environment with specific access protocols. Work Schedule:

• A standard 40-hour work week is anticipated, with the role being on-site.

• While core hours will be established, some flexibility might be available depending on project needs, but consistency and availability for team collaboration during business hours are paramount.

📝 Enhancement Note: The on-site requirement in Chantilly, Virginia, places the candidate in a prime location for government contracting roles. The work environment will likely be structured, professional, and focused on security and productivity, with ample opportunities for direct collaboration with colleagues.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A recruiter or HR representative will likely conduct an initial phone screen to assess basic qualifications, interest, and salary expectations, particularly verifying the TS/SCI clearance status.

• Technical Interview (On-site): This will be a crucial stage, likely involving live coding exercises, problem-solving scenarios, and in-depth discussions about Angular, front-end development principles, and UX concepts. Expect questions related to translating mock-ups into code and debugging.

• Portfolio Review & Discussion: You will be asked to present your portfolio, walking through selected projects and explaining your contributions, technical decisions, and problem-solving approaches. Be prepared to discuss specific UI/UX challenges and how you overcame them.

• Team/Hiring Manager Interview: This interview will focus on assessing cultural fit, collaboration style, and how you would integrate into the existing team. Discussions about your understanding of "mission critical" systems and your approach to working in a secure environment may occur.

• Final Interview (Potentially with Senior Leadership): A final conversation to confirm suitability, discuss career aspirations, and finalize any offer details.

Portfolio Review Tips:

• Curate Strategically: Select 2-3 of your strongest Angular projects that best showcase your UI development skills, problem-solving abilities, and understanding of UX.

• Tell a Story: For each project, clearly outline the problem statement, your approach, the technical solutions you implemented (especially Angular-specific ones), and the positive outcomes or impact of your work.

• Highlight UX Integration: Emphasize how you applied UX principles to enhance usability, navigation, or user flow. Show examples of wireframe/mock-up to implemented UI transitions.

• Code Quality: Be ready to discuss your code and demonstrate how you write clean, maintainable, and well-documented code. If possible, link to public GitHub repositories.

• Quantify Impact: Where possible, use metrics to demonstrate the success of your UI implementations (e.g., improved user engagement, reduced task completion time).

Challenge Preparation:

• Angular Fundamentals: Brush up on core Angular concepts, component lifecycle, data binding, services, routing, and state management.

• Problem-Solving: Practice solving common front-end coding challenges, focusing on efficiency and clarity.

• UX Scenarios: Be prepared to discuss how you would approach designing or improving a user interface for a specific scenario, focusing on user-centric design.

• Security Awareness: Understand the implications of working on a mission-critical system and how security considerations might influence UI development.

📝 Enhancement Note: The interview process will heavily emphasize practical application of Angular skills, problem-solving, and the ability to articulate technical decisions. The portfolio review is a critical component, requiring candidates to not only show their work but also explain their process and impact. The TS/SCI clearance will be verified early and is non-negotiable.

🛠 Tools & Technology Stack

Primary Tools:

• Angular: The core framework for front-end development. Proficiency is essential.

• TypeScript: The primary language for Angular development, requiring strong typing and object-oriented programming skills.

• HTML5 & CSS3: Foundational web technologies for structuring and styling interfaces.

• Git: For source code control and collaborative development workflows.

• Angular CLI: For scaffolding, building, and managing Angular projects.

Analytics & Reporting:

• While not directly a UI developer's primary tool, understanding how UI elements contribute to user analytics and how to potentially instrument for tracking (e.g., event tracking) is beneficial.

• Familiarity with tools used for performance monitoring and debugging web applications. CRM & Automation:

• Not typically within the direct scope of a UI Developer, but understanding how front-end interfaces integrate with back-end systems and APIs is important.

📝 Enhancement Note: The technology stack is heavily centered around the Angular ecosystem. Proficiency in Angular, TypeScript, HTML, and CSS is non-negotiable. Familiarity with Git and the Angular CLI is standard practice for any professional front-end developer.

👥 Team Culture & Values

Operations Values:

• Integrity & Security: Paramount due to the mission-critical nature of the system and the clearance requirement. Adherence to protocols and data protection is essential.

• Excellence & Quality: A commitment to delivering high-quality, robust, and well-tested software solutions.

• Collaboration & Teamwork: Working effectively within a team to achieve common goals, sharing knowledge, and supporting colleagues.

• Innovation & Continuous Improvement: Staying current with modern development practices and seeking ways to enhance the system's user experience and efficiency.

• Reliability & Dependability: Ensuring that the developed interfaces are stable, performant, and consistently available for users.

Collaboration Style:

• The team likely fosters a collaborative environment where open communication and constructive feedback are encouraged.

• Cross-functional collaboration with designers, back-end engineers, and potentially product owners or clients will be a regular part of the workflow.

• A shared responsibility for the success of the messaging system is expected, promoting a team-oriented approach to problem-solving.

📝 Enhancement Note: The culture is likely to be professional, security-conscious, and results-oriented. Values such as integrity, quality, and teamwork will be foundational, especially given the sensitive nature of the work.

⚡ Challenges & Growth Opportunities

Challenges:

• Maintaining High Standards for Mission-Critical Systems: Ensuring that UI implementations are not only visually appealing but also highly reliable, secure, and performant under demanding conditions.

• Translating Complex Requirements: Interpreting intricate user needs and technical specifications for a mission-critical system and translating them into intuitive and functional UI elements.

• Keeping Pace with Evolving Technologies: Continuously learning and adapting to new versions of Angular, front-end best practices, and security protocols within a structured environment.

• Navigating Security Protocols: Working within a secure environment that may have specific development and deployment constraints.

Learning & Development Opportunities:

• Advanced Angular Training: Opportunities to deepen expertise in Angular, including advanced patterns, performance tuning, and architectural best practices.

• UX/UI Specialization: Further development in UX design principles, user research, and interaction design to become a more well-rounded front-end professional.

• Exposure to System Architecture: Gaining insights into the broader architecture of a mission-critical messaging system, understanding how the UI fits into the overall technical landscape.

• Certification & Conferences: Support for obtaining relevant certifications or attending industry conferences to stay abreast of the latest trends in front-end development and Angular.

📝 Enhancement Note: The challenges are inherent to working on high-stakes projects, requiring a developer to be meticulous and adaptable. The growth opportunities are substantial for individuals looking to build a career in specialized front-end development within a secure and impactful domain.

💡 Interview Preparation

Strategy Questions:

• "Describe a complex UI you've built using Angular. What were the main challenges, and how did you overcome them?" (Prepare to discuss specific Angular features, state management, performance optimizations, and API integrations.)

• "How do you ensure your UI designs are intuitive and user-friendly? Walk me through your process for applying UX principles." (Focus on user-centered design, wireframing, prototyping, and feedback incorporation.)

• "Imagine you're given a set of wireframes for a new feature. What are the first steps you take to begin development, and how do you ensure code quality?" (Discuss initial analysis, component breakdown, TypeScript implementation, and adherence to coding standards.)

• "What is your experience with source code control systems like Git? Describe your workflow for contributing to a team project." (Be ready to explain branching, merging, pull requests, and resolving conflicts.) Company & Culture Questions:

• "What interests you about working on a mission-critical messaging system?" (Connect this to your desire for impactful work, technical challenges, and contributing to important operations.)

• "How do you approach working in a team environment, especially when collaborating on complex technical projects?" (Highlight your communication skills, ability to give and receive feedback, and collaborative problem-solving approach.)

• "What are your thoughts on code quality and maintainability, especially in the context of long-term software support?" (Emphasize your commitment to clean code, documentation, and best practices.) Portfolio Presentation Strategy:

• Structure: For each project, clearly state the objective, your role, the technologies used (emphasizing Angular), the challenges faced, your solutions, and the outcome.

• Visuals: Use clear screenshots or live demos of your work. Highlight specific UI elements or interactions that demonstrate your skills.

• Technical Depth: Be prepared to dive into the technical details of your Angular implementation, explaining design patterns, state management, API calls, and any performance optimizations you made.

• UX Focus: Clearly articulate how your UI design choices enhanced the user experience.

📝 Enhancement Note: Interview preparation should focus on demonstrating practical Angular skills, a solid understanding of UX principles, and the ability to articulate technical solutions clearly. The emphasis on "mission critical" means highlighting reliability, security awareness, and collaborative problem-solving will be key.

📌 Application Steps

To apply for this User Interface (UI) Developer position:

• Submit your application through the provided link on the Greenhouse job board.

• Tailor your resume: Highlight specific experience with Angular, front-end development, UI/UX principles, and any projects that demonstrate your ability to translate designs into functional interfaces. Ensure keywords like "Angular," "TypeScript," "UI Developer," and "Front-end" are prominent.

• Prepare your portfolio: Ensure your portfolio is up-to-date and showcases your strongest Angular projects. Be ready to discuss them in detail, focusing on your contributions, technical approaches, and the impact of your work.

• Research Closure Technologies: Understand the company's likely focus (government contracting, secure systems) and prepare to articulate why you are a good fit for this environment, especially regarding your clearance status and commitment to security.

• Practice your technical explanations: Be ready to discuss your coding process, problem-solving strategies, and your understanding of Angular best practices.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.