I am a Senior Frontend Engineer with 12+ years of experience delivering high-performance web applications using React, Next.js, and modern frameworks. I specialize in scalable architecture, performance optimization, and UI/UX best practices, and I enjoy mentoring teams and driving coding standards. I am committed to building secure, user-centric applications and collaborating with cross-functional teams to exceed business goals. I thrive in cross-functional environments and aim to deliver delightful user experiences across platforms.…

David Kreston

I am a Senior Frontend Engineer with 12+ years of experience delivering high-performance web applications using React, Next.js, and modern frameworks. I specialize in scalable architecture, performance optimization, and UI/UX best practices, and I enjoy mentoring teams and driving coding standards. I am committed to building secure, user-centric applications and collaborating with cross-functional teams to exceed business goals. I thrive in cross-functional environments and aim to deliver delightful user experiences across platforms.…

Available to hire

I am a Senior Frontend Engineer with 12+ years of experience delivering high-performance web applications using React, Next.js, and modern frameworks. I specialize in scalable architecture, performance optimization, and UI/UX best practices, and I enjoy mentoring teams and driving coding standards.

I am committed to building secure, user-centric applications and collaborating with cross-functional teams to exceed business goals. I thrive in cross-functional environments and aim to deliver delightful user experiences across platforms.

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Skills

Experience Level

JavaScript
Expert
React JS
Expert
Node.js
Expert
AWS
Expert
Bootstrap
Expert
Github
Expert
GraphQL
Expert
Tailwind
Expert
React Native
Expert
Python
Expert
TypeScript
Expert
CSS
Expert
Figma
Expert
HTML5
Expert
Vue.js
Expert
PostgreSQL
Expert
Kubernetes
Expert
Jira
Expert
Docker
Expert
MongoDB
Intermediate
Redis
Intermediate
Animation
Intermediate
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Language

English
Fluent

Work Experience

Senior React/React Native Engineer at CaryHealth
January 1, 2022 - Present
Developed and maintained cross-platform mobile applications using React Native and Expo for CaryRx, enabling seamless prescription management, same-day delivery scheduling, and real-time pharmacist communication. Engineered modern, scalable front-end interfaces in React for CaryConnect and OneDash, improving medication adherence tracking and health plan clinical gap management. Collaborated on Clair, an AI-powered clinical assistant, integrating Python-based backend services and Node.js APIs to deliver real-time clinical references and decision-support tools for healthcare professionals. Delivered high-performance, accessible, and responsive UI experiences aligned with WCAG standards and optimized for Core Web Vitals. Architected and consumed RESTful and GraphQL APIs, enabling efficient data exchange between mobile apps, front-end platforms, and backend services. Led end-to-end feature development in Agile/Scrum, actively participating in sprint planning, code reviews, and CI/CD pipeli
Senior React Frontend Engineer at PerceptiLabs
January 1, 2022 - August 1, 2025
Contributed to developing a next-generation ML tool with a visual modeler GUI for TensorFlow using React, Next.js, and Material UI. Incorporated Auth0 and AWS Cognito for secure user authentication and authorization. Implemented data visualization with D3.js and enhanced customer efficiency via drag and drop functionality. Integrated REST APIs from PyPi and TensorFlow using Redux and Redux Toolkit. Gamified user experience with UI animations. Ensured 70% test coverage using Jest and Cypress, improving code quality and reliability.
React Frontend Engineer at McMakler
December 31, 2019 - August 1, 2025
Built a real estate and property management web app using React.js, engineered core functionality leveraging Mapbox for dynamic property listings and pricing. Developed over 20 pixel-perfect, reusable UI components using React and Bootstrap. Contributed to front-end API client development with GraphQL and Apollo. Integrated Storyblok CMS for enhanced content management. Configured CI/CD pipelines using AWS CodePipeline and GitHub Actions for automated deployments.
Full Stack Developer at Toptal
February 28, 2017 - August 1, 2025
Consulted on multiple client projects developing Finance, Ecommerce, CRM, Healthcare, and SaaS applications using React, Vue, and Angular. Created wireframes, use cases, and information architectures to clarify project goals. Developed a digital card collecting mobile app with React and React Native, delivering seamless cross-platform accessibility. Implemented web-accessible and mobile-optimized UI with Material-UI, Tailwind CSS, AWS Cloudscape, Bootstrap5, and Emotion. Built animations for page transitions and menus using react-spring and GSAP. Restructured and optimized project architecture with reusable components. Designed real-time multiplayer features with WebSocket and Firebase Real-time DB. Integrated payment gateways for deposits and withdrawals using React Native. Developed backend APIs with Node.js, Express.js, Python, and Sitecore (C# .NET Entity Framework). Implemented high-performance backend solutions with Java and Kotlin using Spring Boot, and PostgreSQL for efficient

Education

Bachelor of Science, Computer Science at Texas Tech University
January 1, 2008 - January 1, 2012

Qualifications

Add your qualifications or awards here.

Industry Experience

Healthcare, Software & Internet, Real Estate & Construction, Financial Services, Professional Services

Skills

Experience Level

JavaScript
Expert
React JS
Expert
Node.js
Expert
AWS
Expert
Bootstrap
Expert
Github
Expert
GraphQL
Expert
Tailwind
Expert
React Native
Expert
Python
Expert
TypeScript
Expert
CSS
Expert
Figma
Expert
HTML5
Expert
Vue.js
Expert
PostgreSQL
Expert
Kubernetes
Expert
Jira
Expert
Docker
Expert
MongoDB
Intermediate
Redis
Intermediate
Animation
Intermediate
See more