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Dario CaldwellDC

Dario Caldwell

Senior Frontend Developer

€250/day
Zurich, CH
8-15 years

Average response time: 1 hour

About Dario

Professional Frontend Developer with over 8 years of expertise designing and developing
scalable, user-centric web applications using React, Next.js, and React Native. Proficient in
TypeScript, modern JavaScript, and Tailwind CSS, delivering high-performance, responsive
user interfaces. Demonstrated success collaborating cross-functionally with designers and
backend engineers to implement optimized, SEO-friendly solutions that enhance user
engagement and application reliability.
  • English

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Comerge AG
    Senior Frontend Developer
    DIGITAL AND IT
    January 2023 - January 2025 (2 years)
    Zürich, Switzerland
    • ● Developed scalable web and mobile applications using React, Next.js, TypeScript and React Native, improving UI performance and responsiveness by 35%.
    • ● Integrated real-time data, authentication and storage solutions with Supabase and Firebase, reducing backend dependency by 40%.
    • ● Deployed on Vercel and AWS, ensuring 99.9% uptime with optimized CI/CD pipelines.
    • ● Improved SEO, accessibility and cross-browser compatibility, increasing organic traffic.
    Next.js React Native CI/CD SEO Amazon Web Services
  • Smartive AG
    Frontend Developer
    DIGITAL AND IT
    January 2021 - January 2022 (1 year)
    Zürich, Switzerland
    • ● Developed responsive web applications using React, JavaScript (ES6+), Typescript, HTML5 and SCSS, supporting high-traffic production systems.
    • ● Converted Figma designs into pixel-perfect, across multiple devices and browsers.
    • ● Integrated REST APIs and implemented state management for complex user workflows.
    • ● Refactored legacy codebases to improve performance, maintainability and code quality.
    • ● Collaborated within Agile/Scrum teams, participated in code reviews.
    HTML5 React.js javasript Pixel-Perfect API REST
  • Augment IT
    Mobile Developer
    DIGITAL AND IT
    January 2019 - January 2020 (1 year)
    Zürich, Switzerland
    • ● Developed cross-platform mobile applications for iOS and Android using React Native and Flutter.
    • ● Implemented mobile UI components with a focus on performance, usability and platform consistency.
    • ● Integrated APIs, handled application navigation and managed client-side state.
    • ● Optimized mobile rendering and reduced UI-related performance issues.
    Flutter kotline React Native Swift iOS

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Education

  • Bachelor of Computer Science
    University of Zurich
    2015
    Bachelor of Computer Science

Certifications

  • Next.js Expert
    IBM
    2025
  • Typescript Master
    IBM
    2025

Skill set

Categories