Senior UI Software Engineer

📍 Job Overview

Job Title: Senior UI Software Engineer

Company: Trellix (Skyhigh Security)

Location: Aylesbury, England, United Kingdom

Job Type: Full time

Category: Software Engineering (UI/Front-end)

Date Posted: September 08, 2026

Experience Level: 5-10 years

🚀 Role Summary

• Drive the development of modular, reusable JavaScript components for modern web applications, focusing on building robust and scalable UI modules.

• Design, code, and enhance new and existing features within cutting-edge Data Protection applications, ensuring a seamless user experience.

• Integrate front-end UI components with middleware APIs and backend systems, contributing to the overall functionality of a larger, complex system.

• Collaborate with a global, diverse engineering team, working closely with UX designers and product partners to deliver a superior user experience.

• Ensure high-quality code through the development of automated, re-usable tests to guarantee a rock-solid customer experience.

📝 Enhancement Note: While the role is for a UI Software Engineer, its context within Skyhigh Security's Data Protection applications and the emphasis on security industry leadership suggests a strong need for engineers who understand the implications of security in UI design and development. The role implies a focus on building secure, user-friendly interfaces for sensitive data protection tools.

📈 Primary Responsibilities

• Lead the design and implementation of modular, re-usable JavaScript components utilizing modern frameworks like Angular, Next.js, or React, adhering to best practices for component architecture.

• Develop and iterate on new features for Skyhigh Security's Data Protection suite, focusing on enhancing existing functionality and improving overall performance and user satisfaction.

• Architect and implement robust integrations between front-end UI elements and middleware APIs/backend services, ensuring efficient data flow and system interoperability.

• Actively participate in cross-functional team collaborations, including close partnerships with UX designers and product management, to translate user requirements and design specifications into functional UI features.

• Champion code quality and reliability by developing comprehensive automated test suites, including unit and end-to-end tests, using frameworks like Jest and Cypress to ensure a stable and secure customer experience.

• Contribute to the continuous improvement of development processes and tooling within an Agile (Scrum) environment, potentially including CI/CD pipelines and source control management.

• Engage in cross-platform and cross-browser development to ensure consistent and high-quality user experiences across various environments.

📝 Enhancement Note: The responsibility of integrating UI components with middleware APIs and backend components highlights the need for this Senior UI Software Engineer to possess a solid understanding of API design principles and backend architecture, even if not directly developing backend code. This is crucial for effective collaboration and efficient development within a larger system.

🎓 Skills & Qualifications

Education: While no specific degree is mandated, a Bachelor's degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience, is typically expected for a Senior level role.

Experience: More than 5 years of hands-on experience in UI development, with a strong focus on building modern, browser-based single-page applications and composable UI modules.

Required Skills:

• Extensive hands-on experience with JavaScript, including deep knowledge of modern ECMAScript features.

• Proven expertise in at least one major JavaScript framework such as Angular, Next.js, or React.

• Strong proficiency in core web technologies: HTML5 and CSS3, including responsive design principles and preprocessors (e.g., Sass, Less).

• Experience in developing and integrating UI components with middleware APIs and backend services.

• Demonstrated ability to design and implement modular, re-usable code.

• Experience in developing automated tests (unit, integration, end-to-end) to ensure code quality and application stability.

• Familiarity with source control systems, particularly Git. Preferred Skills:

• Proven experience specifically with the Angular UI framework.

• Experience working within an Agile (Scrum) engineering environment, including participation in ceremonies and adherence to Agile methodologies.

• Knowledge of continuous integration (CI) servers such as Jenkins.

• Experience using Jira for defect and work tracking.

• Experience with cross-platform and cross-browser development and testing.

• Proficiency with the Jest unit testing framework.

• Experience with the Cypress browser testing framework for end-to-end testing.

📝 Enhancement Note: The requirement for "more than 5 years" of JavaScript experience positions this role firmly at a senior level. The explicit mention of Angular, Next.js, or React indicates a preference for candidates with deep expertise in at least one, with a specific nod towards Angular as a desirable skill, suggesting it might be the primary framework used or has significant presence within the team.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase of complex, browser-based single-page applications (SPAs) demonstrating architectural understanding and scalability.

• Examples of modular, re-usable JavaScript components and UI libraries, highlighting design patterns and maintainability.

• Case studies detailing the integration of front-end components with backend systems or middleware APIs, emphasizing data flow and error handling.

• Evidence of automated testing strategies, including examples of unit tests (e.g., Jest) and end-to-end tests (e.g., Cypress), demonstrating a commitment to quality assurance.

• Projects that illustrate collaboration with UX designers and product teams, demonstrating the ability to translate user needs into functional and aesthetically pleasing interfaces. Process Documentation:

• Documentation of personal contributions to workflow design and optimization within previous projects, particularly for front-end development processes.

• Evidence of involvement in implementing and potentially automating development workflows, such as CI/CD pipelines or build processes.

• Examples of how performance and user experience metrics were tracked and analyzed to drive iterative improvements in UI development.

📝 Enhancement Note: For a Senior UI Software Engineer, a portfolio is critical. It should not only display the visual output but also the underlying architecture, the decision-making process behind component design, and the robust testing strategies employed. Demonstrating experience with API integrations and working within Agile frameworks will be highly valued.

💵 Compensation & Benefits

Salary Range: Based on industry benchmarks for Senior UI Software Engineers in the United Kingdom, particularly in roles requiring 5-10 years of experience with specific frameworks like Angular, React, or Next.js, the estimated salary range is approximately £60,000 - £85,000 per annum. This estimate considers the seniority of the role, the specialized technical skills required, and the cost of living in the Aylesbury region.

Benefits:

• Comprehensive Retirement Plans (e.g., Pension schemes)

• Medical, Dental, and Vision Coverage for employees and potentially dependents.

• Generous Paid Time Off (PTO) allowance, including vacation, sick days, and public holidays.

• Paid Parental Leave to support new parents.

• Support for Community Involvement, potentially including volunteer time off or matching programs.

• Flexible Work Hours to accommodate work-life balance and productivity needs.

• Access to Skyhigh Security's learning series ('Blast Talks') and employee recognition programs.

Working Hours: Standard full-time working hours, typically around 40 hours per week. The company embraces a hybrid work model, suggesting a blend of on-site and remote work, allowing for flexibility in daily schedules.

📝 Enhancement Note: The salary range provided is an estimation based on common UK tech industry standards for a Senior UI Engineer with the specified experience. Actual compensation will vary based on the candidate's specific qualifications, interview performance, and Trellix's internal compensation structure. The listed benefits are directly sourced from the job description.

🎯 Team & Company Context

🏢 Company Culture

Industry: Cloud Security. Skyhigh Security (formerly part of McAfee Enterprise, now Trellix) is a leader in providing data security solutions, focusing on Zero Trust architecture and cloud-native platforms. This positions the company at the forefront of cybersecurity innovation, addressing critical global data protection challenges.

Company Size: Skyhigh Security is part of Trellix, which is a substantial entity in the cybersecurity space. While specific numbers for Skyhigh Security as a distinct unit might vary, the broader Trellix organization is large, suggesting a company with significant resources, established processes, and a global reach. For operations professionals, this means opportunities for structured career growth, access to advanced tools, and exposure to complex, enterprise-level challenges.

Founded: Skyhigh Security has roots tracing back to 2011 (as Skyhigh Networks, acquired by McAfee in 2017, and then spun off as part of Trellix). This history indicates a company with a strong foundation in cloud security, a proven track record, and an evolving approach to meet modern security threats.

Team Structure:

• The UI engineering team is likely part of a larger Software Engineering department, with specialized sub-teams focusing on different product areas or components.

• This Senior UI Software Engineer will report into a UI Engineering Manager or a Director of Engineering, working within a diverse team that includes engineers located globally.

• Collaboration is expected to be high, both within the immediate UI team and cross-functionally with UX designers, product managers, backend engineers, and security architects. Methodology:

• Data Analysis & Insights: UI development will be informed by user behavior analytics, A/B testing results, and feedback from product partners to drive data-driven decisions.

• Workflow Planning & Optimization: Agile methodologies (Scrum) are explicitly mentioned, emphasizing iterative development, continuous feedback, and process refinement.

• Automation & Efficiency: A strong focus on automated testing (unit, end-to-end) and potentially CI/CD pipelines to ensure efficiency, quality, and rapid deployment cycles.

Company Website: https://www.trellix.com/ (Note: The job description mentions Skyhigh Security, which was previously part of McAfee Enterprise and is now integrated into Trellix).

📝 Enhancement Note: Understanding that Skyhigh Security is now part of Trellix is crucial. This implies a larger organizational structure, potentially more established processes, and a broader market presence than a standalone startup. The focus on cloud security and data protection means the operations context involves high stakes, compliance considerations, and a need for robust, reliable systems.

📈 Career & Growth Analysis

Operations Career Level: This role is clearly defined as "Senior," indicating a level of technical leadership, autonomy, and mentorship. A Senior UI Software Engineer is expected to not only execute tasks but also to influence technical direction, mentor junior engineers, and contribute to architectural decisions within the UI domain. The scope includes developing complex features and ensuring the quality and maintainability of front-end codebases.

Reporting Structure: The Senior UI Software Engineer will likely report to a UI Engineering Lead, Manager, or Director of Engineering. They will work within a global team structure, collaborating closely with UX designers, product managers, and backend engineers. This implies a need for strong communication and cross-functional collaboration skills.

Operations Impact: While not a traditional "operations" role in the sense of revenue or sales ops, this UI engineering position has a significant impact on the user experience of Skyhigh Security's Data Protection products. A superior UI directly influences customer adoption, satisfaction, and retention, which in turn impacts the company's overall success and market position in the competitive cloud security landscape. The efficiency and reliability of the UI also directly affect the operational effectiveness of security teams using these tools.

Growth Opportunities:

• Technical Specialization: Deepen expertise in specific frameworks (e.g., Angular, Next.js, React) or explore emerging front-end technologies and best practices.

• Leadership Development: Transition into roles such as Tech Lead, Principal Engineer, or Engineering Manager, taking on more responsibility for technical strategy, team leadership, and project execution.

• Cross-Functional Skill Development: Gain broader exposure to backend systems, API design, security principles, and product management through close collaboration.

• Mentorship: Guide and develop junior engineers, contributing to their technical and professional growth within the organization.

📝 Enhancement Note: The "Senior" designation means candidates should be prepared to discuss leadership contributions, architectural thinking, and problem-solving approaches that go beyond just coding. The impact on customer experience and product adoption is a key differentiator for UI roles in driving business success.

🌐 Work Environment

Office Type: The company embraces a "hybrid work model," indicating a flexible approach that combines remote work with in-office collaboration. This suggests a modern workspace designed to facilitate both focused individual work and team interaction.

Office Location(s): The primary location for this role is Aylesbury, England, United Kingdom. The company also has offices in Santa Clara, Paderborn, Bengaluru, Sydney, and Tokyo, highlighting a global presence and opportunities for international collaboration.

Workspace Context:

• Collaborative Environment: The hybrid model fosters collaboration, with designated office days likely used for team meetings, brainstorming sessions, and cross-functional workshops with UX designers and product partners.

• Tools and Technology: Access to modern development tools, high-performance workstations, and robust network infrastructure is expected to support complex UI development and testing.

• Team Interaction: Opportunities to interact with a diverse, global team of engineers, designers, and product professionals, fostering a rich learning and exchange environment.

Work Schedule: While standard full-time hours (approx. 40/week) are expected, the hybrid model and emphasis on flexibility suggest that employees may have some control over their daily start and end times, provided work is completed and collaboration needs are met. This flexibility is beneficial for managing tasks such as running lengthy automated tests or engaging in deep-dive coding sessions.

📝 Enhancement Note: The hybrid work model is a key aspect of the work environment. Candidates should be comfortable with a mix of remote and in-office work and be adept at collaborating effectively in both settings. The global nature of the team means understanding different time zones and communication styles will be advantageous.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A recruiter or hiring manager will likely conduct an initial phone screen to assess basic qualifications, experience alignment, and cultural fit.

• Technical Interview(s): Expect one or more technical interviews focusing on JavaScript fundamentals, framework-specific knowledge (Angular, React, Next.js), HTML/CSS proficiency, and problem-solving skills. This may include live coding challenges or discussions about past projects.

• Portfolio Review: A dedicated session where candidates present their portfolio, walking through selected projects. This is an opportunity to discuss design choices, technical challenges, solutions, and the impact of their work.

• System Design/Architecture Discussion: For a senior role, there may be a discussion about designing scalable UI architectures, component strategies, and integration patterns.

• Behavioral Interview: Questions assessing teamwork, communication, problem-solving, leadership, and alignment with company values.

• Hiring Manager/Team Lead Interview: A final discussion to assess overall fit, answer candidate questions, and confirm mutual interest.

Portfolio Review Tips:

• Curate Selectively: Choose 3-4 of your strongest projects that best showcase your skills in Angular/React/Next.js, component design, API integration, and automated testing.

• Structure Your Narrative: For each project, clearly articulate the problem statement, your role and contributions, the technical challenges faced, the solutions implemented (highlighting specific frameworks, libraries, or patterns), and the measurable outcomes or impact.

• Showcase Code Quality: Be prepared to discuss code structure, design patterns used, and how you ensured maintainability and scalability.

• Demonstrate Testing: Highlight your approach to automated testing, showing examples of unit tests (Jest) and end-to-end tests (Cypress) where applicable. Explain how testing contributed to quality.

• Explain Collaboration: Discuss how you worked with UX designers, product managers, and backend engineers, providing specific examples of effective communication and collaboration.

• Technical Depth: Be ready to answer in-depth questions about your technology choices, trade-offs considered, and alternative approaches.

Challenge Preparation:

• Coding Challenges: Practice common JavaScript algorithm and data structure problems, as well as framework-specific challenges (e.g., building a specific UI component in React/Angular).

• System Design: Prepare to discuss how you would design a scalable, maintainable UI architecture for a complex web application, considering factors like performance, accessibility, and internationalization.

• Problem-Solving Scenarios: Think about complex UI bugs or performance issues you've encountered and how you diagnosed and resolved them.

📝 Enhancement Note: The portfolio review is paramount for a UI Engineer. Candidates should treat it as a presentation of their technical capabilities, problem-solving approach, and ability to deliver high-quality, impactful user interfaces. Emphasize quantifiable results and specific technical decisions.

🛠 Tools & Technology Stack

Primary Tools:

• JavaScript Frameworks: Angular, Next.js, React (deep expertise in at least one is required, Angular is desirable).

• Core Web Technologies: HTML5, CSS3, JavaScript (ES6+).

• Source Control: Git (with platforms like GitHub likely used).

• Build Tools: Potentially Webpack, Vite, or similar for module bundling and build optimization.

Analytics & Reporting:

• Testing Frameworks: Jest (unit testing), Cypress (end-to-end browser testing).

• Performance Monitoring: Tools for tracking front-end performance metrics (e.g., Lighthouse, browser developer tools).

• Collaboration & Project Management: Jira (for defect and work tracking), potentially Confluence for documentation.

CRM & Automation:

• CI/CD Tools: Jenkins (preferred), or similar for continuous integration and deployment pipelines.

• API Interaction: Tools like Postman or Insomnia for testing API integrations.

• Design Collaboration: Tools like Figma or Sketch for working with UX designers.

📝 Enhancement Note: The explicit mention of Angular, Next.js, React, Jest, Cypress, GitHub, Jenkins, and Jira provides a clear picture of the expected technology stack. Candidates should highlight their proficiency with these tools and demonstrate how they've used them to drive efficiency and quality in UI development.

👥 Team Culture & Values

Operations Values:

• Security First: Given the company's domain, a strong commitment to security principles in all aspects of development, including UI, is paramount. This means understanding secure coding practices and being mindful of potential vulnerabilities.

• Innovation & Learning: The company values learning and staying up-to-date with the newest technology in UI development, encouraging employees to explore and adopt cutting-edge tools and techniques.

• Collaboration & Transparency: A global, diverse team environment that values openness and transparency in communication and collaboration.

• Customer Focus: Delivering a superior user experience and ensuring a rock-solid customer experience through high-quality development and testing.

• Efficiency & Quality: Driving the development of modular, re-usable components and ensuring robust quality through automated testing.

Collaboration Style:

• Cross-Functional Integration: Active collaboration with UX designers, product managers, and backend engineers to ensure seamless integration of UI components and features.

• Global Teamwork: Working effectively with engineers across different time zones and cultural backgrounds, emphasizing clear communication and mutual respect.

• Agile Practices: Embracing an Agile (Scrum) methodology, which fosters iterative development, continuous feedback, and a culture of shared responsibility and improvement.

• Knowledge Sharing: Encouraging the sharing of best practices, technical insights, and learnings within the team, potentially through internal talks or code reviews.

📝 Enhancement Note: The company culture emphasizes a blend of technical excellence in a critical domain (cloud security) with a modern, collaborative, and flexible work approach. Candidates should demonstrate how their values align with security, innovation, and teamwork.

⚡ Challenges & Growth Opportunities

Challenges:

• Complex Integration: Integrating sophisticated UI components with complex middleware APIs and backend systems in a secure and performant manner.

• Global Team Dynamics: Effectively collaborating and communicating with a geographically dispersed team across different time zones and cultural nuances.

• Rapid Technological Evolution: Staying abreast of the fast-paced changes in front-end technologies, frameworks, and best practices to maintain a leading edge.

• Ensuring Security in UI: Developing user interfaces that are not only functional and user-friendly but also inherently secure against potential threats.

Learning & Development Opportunities:

• Advanced Framework Expertise: Deepening specialized knowledge in Angular, Next.js, or React, potentially becoming a subject matter expert.

• Cloud Security Domain: Gaining in-depth understanding of cloud security principles, data protection strategies, and Zero Trust architecture.

• Full-Stack Exposure: Developing a broader understanding of backend systems, API design, and microservices through close collaboration with backend teams.

• Leadership & Mentorship: Opportunities to lead technical initiatives, mentor junior engineers, and potentially move into team lead or architect roles.

• Industry Conferences & Certifications: Potential for participation in industry events and relevant professional development programs to enhance skills and knowledge.

📝 Enhancement Note: The challenges presented are typical for senior roles in dynamic tech companies, particularly in specialized fields like cybersecurity. The growth opportunities highlight clear paths for career advancement and skill expansion within Trellix.

💡 Interview Preparation

Strategy Questions:

• "Describe a complex UI component or feature you designed and implemented. What were the key architectural decisions, trade-offs, and challenges, and how did you ensure its reusability and maintainability?" (Focus: Component design, architecture, problem-solving)

• "How do you approach integrating front-end applications with backend APIs? Discuss your experience with RESTful APIs, error handling, and ensuring data consistency." (Focus: API integration, system understanding)

• "Walk me through your process for developing automated tests for a front-end application. What tools have you used (e.g., Jest, Cypress), and how do you ensure comprehensive test coverage?" (Focus: Quality assurance, testing methodologies) Company & Culture Questions:

• "What interests you about Skyhigh Security and our mission in cloud security? How do you see your skills contributing to our data protection solutions?" (Focus: Company alignment, motivation)

• "Describe your experience working in an Agile (Scrum) environment. How do you contribute to team velocity and sprint goals?" (Focus: Agile experience, teamwork)

• "How do you stay updated with the latest trends in UI development and incorporate new technologies into your work?" (Focus: Continuous learning, innovation) Portfolio Presentation Strategy:

• Project Deep Dive: Select a project that showcases your strongest skills in Angular/React/Next.js, API integration, and automated testing. Be ready to explain the problem, your solution, and the impact.

• Code Structure & Patterns: Be prepared to discuss the design patterns you used (e.g., MVC, MVVM, component-based architecture), your folder structure, and how you ensure code quality and scalability.

• Testing Demonstrations: Show examples of your unit tests and end-to-end tests. Explain your testing strategy and how it benefited the project.

• Collaboration Examples: Provide specific instances where you collaborated effectively with UX designers or backend engineers to deliver a successful feature.

• Quantifiable Results: Whenever possible, present metrics on performance improvements, bug reduction, or user adoption that resulted from your work.

📝 Enhancement Note: Interview preparation should focus on demonstrating not just technical proficiency but also a strategic mindset, a strong understanding of the software development lifecycle, and the ability to integrate effectively within a team and company culture.

📌 Application Steps

To apply for this Senior UI Software Engineer position:

• Submit your application through the provided Workday job portal link: https://trellix.wd1.myworkdayjobs.com/EnterpriseCareers/job/England-Aylesbury/Senior-UI-Software-Engineer_JR0036926

• Customize Your Resume: Tailor your resume to highlight your 5+ years of JavaScript experience, specific framework expertise (Angular, React, Next.js), CSS/HTML proficiency, and experience with automated testing tools (Jest, Cypress). Use keywords from the job description such as "single page applications," "modular components," and "middleware APIs."

• Prepare Your Portfolio: Curate a portfolio that showcases your best UI development projects, emphasizing modular component design, API integrations, and robust testing strategies. Be ready to present these projects effectively, detailing your contributions and the impact of your work.

• Practice Technical Questions: Review common JavaScript, HTML, CSS, and framework-specific interview questions. Practice live coding exercises and prepare to discuss your approach to complex UI challenges and system design.

• Research Trellix/Skyhigh Security: Familiarize yourself with the company's mission in cloud security, its products, and its hybrid work culture. Understand their commitment to data protection and Zero Trust architecture to articulate your interest and alignment during interviews.

⚠️ 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.