Years of experience: 10

ReactC#JavaScriptCSSC++Rust

Trusted by top professionals

  • SS
    Sam Swayer
    Project Manager @LunarCrush
    Verified
    Working with Johann has been nothing short of FANTASTIC! I've had some bad experiences with developers, missing deadlines, and providing substandard work, but Johann is the best I've ever worked with....

Trust Score

Exceptionally trusted; proven professional excellence.

100%
Johann's Career Path
Senior Full-Stack DeveloperJun. 2024 -
Dec. 2024
LunarCrushSenior Full-Stack Developer
United States- Improved legacy React code based on best practices Served as a lead front-end developer for improvements and mentored junior developers - Worked with Ethereum, Polygon, and other EVM-compatible chains, including deploying and integrating smart contracts using Solidity, Web3.js, and Ethers.js - Led migrating a large-scale web application from React and Node.js to Next.js and GraphQL, achievi...
Full-Stack Developer for Open-Source Crypto Analytics SiteOct. 2023 -
Jun. 2024
Escape VelocityFull-Stack Developer for Open-Source Crypto Analytics Site
United States- Implemented pixel-perfect and responsive frontend pages using React and Material UI, implementing dynamic components like tables, dialogs, modals, etc. - Developed RESTful APIs with Node.js and Express to handle user authentication and support CRUD operations like task management, category filtering, etc. - Integrated TypeScript for type safety across the front-end and backend, improving co...
Frontend EngineerMar. 2023 -
Aug. 2023
SparkrockFrontend Engineer
United States- Developed web frontend pages using Angular 10, TypeScript, Bootstrap, and LESS/CSS - Translated Figma designs into pixel-perfect, mobile-friendly interfaces and built reusable Angular components - Managed data by updating Microsoft 365 tables and integrated backend APIs built with .NET Core - Collaborated with clients to gather and analyze requirements while providing comprehensive technica...

Johann's Posts

  • How I can help you

    I build fast, responsive web and mobile apps, translating business needs into clean code. I enhance site performance, integrate APIs, and ensure security. This approach boosts user experience and accelerates product launches.

  • People I am looking for

    Seeking clients like startups and established firms. Past projects include: fintech investment platforms, healthcare systems, social media dashboards. Open to diverse industries.

  • Experience & Cases

    Achievements include: - Revamped fintech platform for better UX - Built responsive patient management system - Developed real-time analytics dashboard Clients: startups, small businesses, entrepreneurs

  • How to contact

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  • About myself

    With a decade of experience, I've developed enterprise web and mobile apps using frameworks like React.js and Node.js. Led a financial platform's front-end migration, boosting performance by 40%. Mentored juniors, enhancing testing and CI/CD practices.

  • Job Description

    Seeking a role in challenging projects focused on performance and user experience. Interested in a team that values communication and learning, where I can impactfully grow my front-end and back-end development skills.

  • How to contact

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  • About myself

    With over a decade of expertise, I excel in crafting scalable web applications utilizing React, JavaScript, and TypeScript. I improved a React app's load time by 40%, led migrations to React, and integrated AI with TensorFlow.js. Skilled in mentoring and collaboration.

  • Job Description

    Seeking a dynamic role to tackle challenging front-end projects with React and cutting-edge JavaScript tech. I thrive in team environments that emphasize clean code, robust architecture, and continuous learning, aiming to contribute to high-quality, scalable software.

  • How to contact

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