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Ondrej Maksi

Ondrej Maksi

Bratislava, Bratislava Region, Slovakia
Member since October 10, 2014
As a technical person at heart, Ondrej has more than eight 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 two years, he has focused exclusively on React-based front-end applications.
Ondrej is now available for hire
  • JavaScript, 8 years
  • HTML5, 8 years
  • Sass, 4 years
  • Node.js, 4 years
  • React, 2 years
  • MobX, 1 year
  • Redux, 1 year
Bratislava, Bratislava Region, Slovakia
Preferred Environment
Windows, Atom, Chrome, GitHub
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's new React based platform (not public yet). Focused on pixel-perfect layout, animations, and responsiveness.
    • Worked on an internal 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 -
    • Optimized build process, improved performance, analytics, and general fine-tuning for - a React/Redux built store.
    Technologies: JavaScript, React, Redux, MobX, Node.js, HTML, Sass
  • 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: JavaScript, Sencha Touch
  • 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: JavaScript, jQuery
  • 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: JavaScript, jQuery, Node.js
  • 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: JavaScript, jQuery, PHP, Ruby on Rails
  • 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: SAP, Unix, Linux, Bash
  • 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, Sass, CSS, JavaScript, Less
  • Frameworks
    Redux, Express.js, Flux, Electron.js
  • Libraries/APIs
    React, MobX, Node.js, Three.js, HTML5 Canvas, WebSockets, jQuery, NW.js, Raphaël, D3.js, WebGL
  • Tools
    NPM, Subversion (SVN), Webpack, Git, Mongoose, Adobe Photoshop, Adobe Illustrator
  • Paradigms
    Agile Software Development, REST, Scrum
  • Storage
  • Other
    Mobile Web, SVG, Front-end, Isomorphic, Project Management, Technical Project Management, Usability
  • Platforms
    Linux, Arduino
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