Available to hire
I’m Sabrina Duflo, a Senior Front-end Developer with 8+ years of experience building secure, scalable, high-performance web applications.
I specialize in Next.js, React, and TypeScript, with a cloud-native mindset on Google Cloud Platform. I focus on compassionate, user-centric solutions through robust design patterns and test-driven development (TDD), delivering measurable improvements in performance, accessibility, and user adoption.
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Language
English
Fluent
Work Experience
Senior Frontend Software Engineer at Optum
August 1, 2022 - December 1, 2025Contributed to system design and frontend architecture for large-scale distributed systems. Architected and implemented micro-frontend architecture using React, Redux, TypeScript, Next.js (SSR) and Vue (internal systems). Led development of patient-facing features including prescription management, refill workflows, payments, and delivery tracking. Integrated secure payment systems and insurance APIs with HIPAA-aligned data protection. Improved patient portal adoption by optimizing UX; reduced cart abandonment by streamlining checkout. Enhanced page load performance via SSR, code splitting, and performance tuning. Increased reliability to 99.8% uptime through monitoring, error handling, and DevOps collaboration. Established testing standards with Jest and Cypress; championed accessibility (WCAG) and responsive design. Mentored engineers and drove best practices in scalability and maintainable code.
Frontend Developer at Visa
August 1, 2020 - June 1, 2022Developed and enhanced customer-facing dashboards and internal banking administration systems using React, Redux, TypeScript, and Next.js. Improved application performance by 15% through code optimization, lazy loading, and efficient state management. Refined CI/CD workflows, increased deployment speed, and reduced production bugs through refactoring and testing. Collaborated with DevOps to containerize frontend apps with Docker and AWS, optimizing release reliability. Built reusable component libraries to ensure UI consistency and accelerate development. Mentored developers and collaborated cross-functionally with product, backend, and UX teams.
UI/UX Design Team Lead at Visa
January 1, 2019 - August 1, 2020Led a cross-functional UI/UX team of 8 designers across Canada and India, driving design excellence for customer dashboards and internal banking systems. Owned end-to-end design strategy from research to high-fidelity prototypes and developer handoff. Designed data-intensive dashboards for real-time monitoring, redesigned internal workflows to improve efficiency, established a unified design system, and partnered with product, engineering, compliance, and security to deliver secure interfaces. Led usability testing and iterated based on feedback.
UI/UX Designer at Intellify Learning
May 1, 2017 - December 1, 2018Led the end-to-end design of the company’s customer-facing web platform for learning data management and analytics. Conducted user research, created wireframes and high-fidelity prototypes, and designed dashboards for data visualization. Collaborated with product managers and developers to ensure pixel-perfect implementation and established consistent design systems and guidelines to strengthen brand identity. Improved user engagement and navigation accuracy through streamlined flows and usability testing.
UI/UX Design Team Lead at Visa UI/UX Design Team
January 1, 2019 - August 1, 2020Led a cross-functional UI/UX team of 8 designers across Canada and India, shaping design strategy for customer dashboards and internal banking systems. Owned end-to-end design from research and journey mapping to high-fidelity prototypes and developer handoff using Figma. Redesigned workflows to reduce task time and accelerated feature delivery by implementing a unified design system and component libraries. Collaborated with product, engineering, compliance, and security to deliver secure, scalable, accessible interfaces; led usability testing and incorporated feedback.
Education
Bachelor of Science in Informatics at The University Of Arizona
January 1, 2012 - January 1, 2017Bachelor of Science in Informatics at The University Of Arizona
January 1, 2012 - January 1, 2017Bachelor of Science in Informatics at The University Of Arizona
January 1, 2012 - January 1, 2017Bachelor of Science in Informatics at The University Of Arizona
January 1, 2012 - January 1, 2017Qualifications
Industry Experience
Software & Internet, Healthcare, Financial Services, Professional Services, Media & Entertainment, Life Sciences
Skills
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Expert
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