Ondrej Maksi, Developer in Bratislava, Slovakia
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Ondrej Maksi

Verified Expert  in Engineering

Front-end Developer

Location
Bratislava, Slovakia
Toptal Member Since
February 28, 2015

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.

Portfolio

Freelance
Sass, HTML, Node.js, Redux, React, JavaScript, Next.js, Software Development...
Mangata Finance
TypeScript, Blockchain, Rust, Go, Kubernetes, Docker, MetaMask, Parity Polkadot...
IBM
JavaScript, Software Development, Full-stack Development, Full-stack...

Experience

Availability

Part-time

Preferred Environment

GitHub, Chrome, Terminal, Visual Studio Code (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.

Work Experience

Contractor | Consultant | Developer

2014 - PRESENT
Freelance
  • Supported development efforts of multiple contracts. Provided full-stack development services to startups, scale-ups, and corporations.
  • Developed several pages for Picr.com's new React-based platform. Focused on its pixel-perfect layout, animations, and responsiveness.
  • Worked on an internal Priceline.com application for managing special offers. Worked as a full-stack developer using Node.js.
  • Developed IQ7 for Olofson Technologies, a system for managing bankruptcies. Built the system in React/Redux.
  • Consulted and helped set up Socket Bot's React/Flux environment.
  • Helped develop parts of Osmo's React-based public website—Playosmo.com.
  • Optimized the build process, improved performance, analytics, and general fine-tuning for Vervewine.com, a React/Redux-built online store.
  • Helped develop Cat.com, the website of Caterpillar.
Technologies: Sass, HTML, Node.js, Redux, React, JavaScript, Next.js, Software Development, Full-stack Development, Full-stack, Front-end Development, CSS, API Documentation, HTML5, NPM, Front-end, Mobile Web, Git, HTML5 Canvas, Heroku, Amazon S3 (AWS S3), Amazon Web Services (AWS), Databases, Docker, D3.js, GraphQL, Raphaël, REST, Isomorphic, WebSockets, SVG, Webpack, Figma, TypeScript, Code Review, APIs, User Experience (UX), User Interface (UI), SVG Animation, Material UI, Storybook, Jest, Amazon Simple Notification Service (Amazon SNS), Amazon Simple Queue Service (SQS), Amazon Simple Email Service (SES), Back-end, SEO Tools, Web Performance Optimization (WPO), Website Performance, Performance Engineering, Early-stage Startups

Software and DevOps Engineer

2020 - 2021
Mangata Finance
  • Developed a decentralized finance exchange in the Polkadot/Substrate ecosystem.
  • Created a trading interface using full-stack TypeScript engineering, including Node.js and React.
  • Managed DevOps of the whole operation using Kubernetes and Docker.
Technologies: TypeScript, Blockchain, Rust, Go, Kubernetes, Docker, MetaMask, Parity Polkadot, Software Development, Full-stack Development, Full-stack, Front-end Development, CSS, HTML, HTML5, NPM, Front-end, Mobile Web, Git, HTML5 Canvas, Amazon Web Services (AWS), Databases, REST, Figma, Ethereum, Web3.js, APIs, User Experience (UX), User Interface (UI), Storybook, Back-end, Web Performance Optimization (WPO), Website Performance, Performance Engineering, Early-stage Startups

Senior Front-end Developer

2013 - 2015
IBM
  • 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, Software Development, Full-stack Development, Full-stack, Front-end Development, CSS, HTML, HTML5, NPM, Front-end, Mobile Web, Git, HTML5 Canvas, Arduino, REST, WebSockets, APIs, User Experience (UX), User Interface (UI), Back-end, Performance Engineering

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, Software Development, Front-end Development, CSS, HTML, HTML5, NPM, Front-end, Mobile Web, Git, HTML5 Canvas, REST, APIs, User Experience (UX), User Interface (UI), Performance Engineering

Project Manager | Technical Lead

2011 - 2013
Ixonos (currently Digitalist)
  • Managed teams of mobile developers and QA engineers using Agile methodology.
  • Developed multiple mobile applications for international customers.
  • Developed a series of cutting-edge 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, Software Development, Front-end Development, CSS, Three.js, HTML, HTML5, Front-end, Mobile Web, Git, HTML5 Canvas, REST, Subversion (SVN), APIs, Web Performance Optimization (WPO), Website Performance, Performance Engineering

Co-founder | CTO | Lead Developer

2009 - 2011
Advertia
  • Managed and coordinated the design and development of web products.
  • Developed web projects according to given specifications.
Technologies: jQuery, JavaScript, Software Development, Full-stack Development, Full-stack, Front-end Development, CSS, HTML, HTML5, Front-end, Mobile Web, HTML5 Canvas, Usability, REST, Web Performance Optimization (WPO), Website Performance, Performance Engineering

SAP Basis Administrator

2008 - 2009
T-Systems
  • 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

Languages

HTML, HTML5, JavaScript, CSS, Sass, TypeScript, Less, GraphQL, SQL, Bash, Python, C++, Go, Haskell, Rust

Frameworks

Next.js, Redux, Express.js, Material UI, Chrome, Electron, Parity Polkadot, Jest

Libraries/APIs

Node.js, React, HTML5 Canvas, Raphaël, Three.js, D3.js, jQuery, Web3.js

Tools

NPM, GitHub, Webpack, Subversion (SVN), Git, Ace Editor, Figma, Terminal, Adobe Photoshop, Adobe Illustrator, MetaMask, Amazon Simple Notification Service (Amazon SNS), Amazon Simple Queue Service (SQS), Amazon Simple Email Service (SES)

Paradigms

Web Performance Optimization (WPO), REST

Other

Front-end, Front-end Development, Software Development, Full-stack Development, Full-stack, Website Performance, Gatsby, Isomorphic, Mobile Web, WebSockets, SVG, Usability, User Experience (UX), User Interface (UI), APIs, Back-end, SEO Tools, Performance Engineering, Early-stage Startups, SAP, Graph Query Language (GQL), API Documentation, Code Review, SVG Animation, Storybook

Platforms

Heroku, Docker, DigitalOcean, Unix, Amazon Web Services (AWS), Linux, Arduino, Kubernetes, Blockchain, Ethereum, Jupyter Notebook, Visual Studio Code (VS Code)

Storage

Amazon S3 (AWS S3), Databases, PostgreSQL

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