Ondrej Maksi, Front-end Developer in Bratislava, Slovakia
Ondrej Maksi

Front-end Developer in Bratislava, Slovakia

Member since October 10, 2014
As a technical person at heart, Ondrej has more than ten years of professional experience as a developer and technical leader. He has worked with corporations, mid-sized development companies, and several startups. He is ambitious, professional, and a strong communicator. Over the past three years, he has been developing full-stack JavaScript applications in React/Node.js.
Ondrej is now available for hire




Bratislava, Slovakia



Preferred Environment

GitHub, Chrome, Terminal, VS Code, MacOS

The most amazing...

...thing I've recently developed is a light control system consisting of custom Arduino modules, a Node.js server and app, and an iOS app.


  • Contractor/Consultant/Developer

    2014 - PRESENT
    Freelance (via Toptal)
    • Developed several pages for Picr.com's new React based platform (not public yet). Focused on pixel-perfect layout, animations, and responsiveness.
    • Worked on an internal Priceline.com application for managing special offers. Full-stack Node.js.
    • Developed IQ7 for Olofson Technologies, a system for managing bankruptcies. Built in React/Redux (not public).
    • Consulted and helped set up SocketBot's React/Flux environment.
    • Helped develop parts of Osmo's React-based public website - Playosmo.com.
    • Optimized build process, improved performance, analytics, and general fine-tuning for Vervewine.com - a React/Redux built store.
    Technologies: Sass, HTML, Node.js, MobX, Redux, React, JavaScript
  • Senior Front-end Developer

    2013 - 2015
    • Developed a lighting control system for embedded, mobile, and desktop devices.
    • Architected front-end solutions for a responsive client application.
    • Worked with event-based asynchronous communication for both client- and server-side.
    • Provided design input, optimized data processing, improved performance, and refactored code.
    • Worked and coordinated with multiple remote teams and subcontractors.
    Technologies: Sencha Touch, JavaScript
  • Front-end Technical Lead

    2012 - 2013
    NESS Technologies
    • Developed an enterprise level front-end application for the health insurance industry.
    • Worked with big data from the healthcare sector.
    • Coordinated development efforts with the remote development team.
    • Provided design guidelines, consultations, code reviews, and code refactoring.
    • Trained and transitioned developers to use HTML5 technologies.
    Technologies: jQuery, JavaScript
  • Project Manager, Technical Lead

    2011 - 2012
    • Managed teams of mobile developers and QA engineers using Agile methodology.
    • Developed multiple mobile applications for international customers.
    • Developed responsive HTML5 websites.
    • Researched the performance and usage possibilities of HTML5 in mobile development.
    • Trained and transitioned developers to use HTML5 technologies.
    Technologies: Node.js, jQuery, JavaScript
  • Co-founder, CTO, Lead Developer

    2009 - 2011
    • Managed and coordinated the design and development of web products.
    • Developed web projects according to given specifications.
    Technologies: Ruby on Rails (RoR), PHP, jQuery, JavaScript
  • SAP Basis Administrator

    2008 - 2009
    • Administered the basis of SAP applications for international customers.
    • Used a variety of platforms and landscapes including Linux, AIX, HP-UX, and Windows.
    • Performed backups, system copies, and migrations.
    Technologies: Bash, Linux, Unix, SAP


  • Toptal Mentor
    Ondrej is a mentor in the Toptal Global Mentor’s Program. This program is a partnership between Toptal and General Assembly to provide high quality mentorship for students from minority and low income backgrounds who are looking to begin their careers as professional software engineers. Ondrej shows commitment to diversity in tech by mentoring a General Assembly student every week for a year, covering everything from coding tips and tricks to advice on making it in the industry.


  • Languages

    HTML5, JavaScript, CSS, Sass, Less, GraphQL, SQL, PHP, Bash, HTML
  • Frameworks

    Redux, Express.js, Flux, Next.js, Chrome, Sencha Touch, Ruby on Rails (RoR), Electron.js
  • Libraries/APIs

    Three.js, Node.js, React, GatsbyJS, HTML5 Canvas, jQuery, Raphaël, MobX, D3.js
  • Tools

    NPM, GitHub, Webpack, Subversion (SVN), Git, Ace Editor, Figma, VS Code, Terminal, Adobe Photoshop, Adobe Illustrator
  • Paradigms

    Agile Software Development, Scrum, REST
  • Platforms

    Heroku, Docker, DigitalOcean, MacOS, Unix, Amazon Web Services (AWS), Linux, Arduino
  • Storage

    AWS S3, Databases
  • Industry Expertise

    Project Management
  • Other

    Isomorphic, Mobile Web, Front-end, WebSockets, SVG, Usability, Technical Project Management, AWS, SAP

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