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Skills

  • App Development
  • Back End Development
  • Content Management Systems
  • Design
  • Shopify
  • SMS
  • Social Networking Development
  • Software Development
  • Squarespace
  • Thumbnail Design
  • User Experience Design
  • Web Design
  • Web Development
  • Web Graphics
  • Web Hosting

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Services

  • Mobile and Web Application Development

    $30/hr Starting at $1K Ongoing

    Dedicated Resource

    I help businesses and individuals bring their ideas to life through beautiful, high-performing web and mobile applications. From concept to launch, I handle every stage including design, development,...

    App DevelopmentBack End DevelopmentContent Management SystemsCreative DesignDesign

  • Full-Stack Developer (Node.js, React, TypeScript, AWS)

    $30/hr Starting at $0 3 months minimum

    Dedicated Resource

    I developed a full-featured video platform that allows creators to upload and sell their content while providing an easy, secure viewing experience for users. The system supports three main roles: Admin,...

    App DevelopmentBack End DevelopmentCommunications TechnologyContent Management SystemsContent Writing

About

Senior Full-Stack & Mobile Engineer | Scalable Web, Cloud & React Native Apps

Jonathan David Klein is a senior full-stack engineer with more than ten years of experience building scalable applications across web, mobile, and cloud platforms. Work spans industries including biosciences, government, and consumer technology, with a focus on delivering reliable, high-performance solutions that balance technical depth with user-focused design. Skilled in modern front-end frameworks such as React, Next.js, and Vue, and mobile app development with React Native, combined with strong back-end expertise in Node.js, Java, and Python. Experienced with AWS, GCP, and database design, consistently driving projects from concept to launch while optimizing systems for efficiency and scale.

Work Terms

Available during U.S. business hours with flexibility around project needs and deadlines. Payments can be arranged hourly or by milestone depending on scope. Communication is consistent and responsive through Guru messages, with Slack as the preferred channel for day-to-day collaboration and faster updates.