Senior UI Engineer

The Opportunity

At ESW, we help some of the world’s best-loved brands deliver frictionless, cross-border shopping experiences. As a leading global DTC eCommerce platform, we provide technology and services that enable brands to localize checkout, logistics, compliance, and customer service in over 200 markets.

We're scaling rapidly, and to support our growth, we’re looking for a Senior UI Engineer who thrives on building fast, accessible, and intuitive web interfaces that power global commerce.

As a Senior UI Engineer, you’ll join a highly collaborative product and engineering team focused on delivering best-in-class user interfaces for our eCommerce platform. You’ll be responsible for creating modular, scalable UI components, driving front-end architecture decisions, and mentoring developers across multiple squads.

Responsibilities

• Design, develop, and maintain high-performance, reusable UI components and front-end systems using modern JavaScript frameworks (Angular, React, Vue, etc.).
• Collaborate closely with UX/UI designers, product managers, and backend engineers to bring features to life with high quality and performance.
• Translate design prototypes and wireframes into responsive, accessible web interfaces.
• Champion and contribute to our front-end architecture and component library (e.g., design systems, style guides).
• Ensure cross-browser compatibility and mobile responsiveness for all UI features.
• Optimize front-end performance and improve loading times and accessibility scores.
• Participate in code reviews, technical discussions, and continuous improvement initiatives.
• Mentor junior and mid-level engineers, providing technical guidance and support.

Requirements

• 5+ years of experience in UI/front-end development, with a strong focus on modern JavaScript frameworks (React preferred).
• Proficient in HTML5, CSS3/SASS, TypeScript, and modern build tools (Webpack, Vite, etc.).
• Solid understanding of responsive design, cross-browser compatibility, and accessibility (WCAG/ARIA).
• Experience working with RESTful APIs and integrating UI with backend services.
• Familiarity with Agile methodologies, CI/CD workflows, and Git-based version control.
• Strong problem-solving skills and attention to detail.
• Excellent communication and collaboration abilities in a fast-paced environment.

Preferred Qualifications

• Experience working in eCommerce or high-scale, high-availability web platforms.
• Familiarity with performance monitoring tools (Lighthouse, WebPageTest, etc.).
• Knowledge of animation libraries, motion design, or micro-interactions.
• Contributions to open-source UI libraries or design systems.

About ESW

Our purpose is simple: to create moments that matter between people and the brands they cherish. We enable brands to expand their global reach, facilitating simple and seamless ecommerce experiences for consumers worldwide. Through our integration solutions, we deliver a complete international checkout experience, including local duties, taxes, fulfilment, delivery management, and global returns and payment processing capabilities.

Guided by our values—Own It, Champion Simplicity, Win as One, and Debate then Commit—we strive to foster innovation, accountability, and teamwork, creating solutions that inspire trust and drive impactful results.

Why join us?

• Competitive salary and benefits: Your financial well being is important to us. Join ESW and experience the satisfaction of being rewarded for your hard work, dedication and commitment.
• Professional and personal development: Find your spark and leave your mark. We will ensure your talent is nurtured and cultivated for growth and success throughout your career with ESW.
• Hybrid Working: Our Hybrid Working Model empowers you to embrace the flexibility of hybrid working and enjoy the best of office and remote work.
• Diversity, Belonging & Inclusion: When we win, we win together. You'll be part of a culture that values every individual for who they are, fostering an environment where uniqueness is encouraged.

ESW is an equal opportunity employer, and we’re proud of our ongoing efforts to foster diversity, equity, & inclusion in the workplace. Individuals seeking employment and employees at ESW are considered without regard to race, color, religion, national origin, age, sex, gender, gender identity, gender expression, sexual orientation, marital status, medical condition, ancestry, disability, military or veteran status, or any other characteristic protected by applicable law.

If you require any reasonable accommodations or adjustments throughout the hiring process, please let us know. We are dedicated to ensuring equal access and opportunity for all candidates.

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