Antonin Januska, Developer in Boulder, CO, United States
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Antonin Januska

Verified Expert  in Engineering

Software Developer

Boulder, CO, United States
Toptal Member Since
April 8, 2020

Antonin is a versatile full-stack developer with a strong JavaScript background. He has built entire products from scratch in Node.js, React, Angular, and other popular JavaScript technologies. He also comes from a PHP background with WordPress proficiency and has experience building APIs with Elixir/Phoenix.

TypeScript, React, Cypress, Elixir
React, Cypress, CircleCI, Elixir
PostgreSQL, OCR, Angular, AngularJS, React, Phoenix, Elixir, Node.js




Preferred Environment

Tmux, Linux, Vim Text Editor, Visual Studio Code (VS Code), Adobe Illustrator, Adobe Photoshop

The most amazing...

...thing I've developed was a land management system as a sole and later senior developer that grew as a product to serve enterprise-level businesses.

Work Experience

Staff Software Engineer

2022 - PRESENT
  • Led web team in restructuring itself and tackling major web tech debt and related initiatives.
  • Built features for front-end applications, including the UI for client-side data modeling and filtering. This included TypeScript type modeling for robust type safety around arbitrary data.
  • Helped make key architectural decisions for front-end applications, from providing input on cross-team initiatives to setting standards.
Technologies: TypeScript, React, Cypress, Elixir

Senior Software Engineer

2020 - 2022
  • Planned, oversaw, and implemented a large-scale refactor on a business-critical part of the front-end web React application from JavaScript and a Redux architecture to use TypeScript and React query.
  • Led the web team and web team initiatives. Including merging a dozen front-end applications into a monorepo, which encouraged cross-collaboration and knowledge/code sharing across applications.
  • Built an Elixir service for fetching and displaying website metadata for user-submitted links.
Technologies: React, Cypress, CircleCI, Elixir

Senior Engineer

2015 - 2020
  • Built a front-end single-page application in AngularJS and spear-headed efforts to migrate and hybridize into an Angular application, and then worked on rewriting the application from scratch in React and Redux.
  • Decided on the stack, streamlined the dev workflow, worked on performance, and created a comprehensive test suite and a collaboration protocol. Developed application architecture.
  • Managed project development and momentum and hired for the team in the initial years of the startup.
Technologies: PostgreSQL, OCR, Angular, AngularJS, React, Phoenix, Elixir, Node.js

Full-stack Development and Design

2005 - 2020
  • Speedily converted Photoshop and Illustrator designs to WordPress websites and implemented a performant workflow for the process.
  • Designed numerous websites for small businesses and converted those into WordPress websites.
  • Oversaw the deployment of web properties to servers.
  • Developed sites in Wix, Squarespace, and Webflow for small businesses to showcase their portfolios and services and empowered them to make content updates.
Technologies: React, AngularJS, WordPress, Node.js, Adobe Photoshop, Adobe Illustrator

AngularJS Consultant

2014 - 2015
  • Built out the AngularJS side of an open-source product called "Foundation for Apps."
  • Helped manage the open-source aspect of "Foundation for Apps."
  • Worked on the popular Foundation CSS framework for bug fixing and bug triage.
Technologies: Gulp, Sass, AngularJS, JavaScript

Applications Developer

2013 - 2014
Consumer Media Network
  • Developed an email remarketing aspect to the lead generation funnel.
  • Developed high-performance APIs and front-ends to serve data to millions of users.
  • Developed and tuned existing lead generation engine to increase conversion rates as well as performance.
Technologies: Ansible, Puppet, Chef, Vagrant, Ruby on Rails (RoR), Ruby, Node.js, Symfony, PHP, AngularJS

Lead Developer

2012 - 2013
  • Developed an internal set of tooling for others on the team to use.
  • Managed project development from start to finish as well as tracked feature development.
  • Utilized UX and UI popular design principles to improve application experience.
Technologies: PostgreSQL, Knockout (Knockout.js), Sass, Laravel, PHP

Front-end Developer

2012 - 2012
  • Developed a link-sharing feature with preview fetching for a social network.
  • Established CSS architecture and patterns for others to follow.
  • Developed a link preview aspect of a link-sharing social network.
Technologies: CSS, Knockout (Knockout.js), C#

Director of Development

2011 - 2012
Adhere Creative
  • Developed and streamlined a WordPress development flow to increase productivity.
  • Designed and presented website and logo designs for various companies in their rebranding process.
  • Implemented up-to-date search engine optimization recommendations on WordPress sites and streamlined the SEO process for new projects.
  • Implemented website designs in Hubspot -- a low-code, marketing-first CMS that allows users to easily update content on their own.
Technologies: Adobe Illustrator, HubSpot, CSS, WordPress, PHP


A Node.js API back end that accessed and served multiple vast datasets (government data as well as custom-gathered data) that front-end developers could utilize to create rich and interactive applications. With heavy caching, it was able to support millions of users every month.

Tseczka Framework
A WordPress and CSS framework I developed in order to rapidly develop client projects as well as rapidly convert Photoshop/Illustrator files into premium WordPress websites. It handled everything from having a CSS framework to being SEO-compliant

I took over active development and open source community management for ng-redux, an AngularJS wrapper for Redux. I rewrote majority of the code to provide more flexibility to redux/angularjs users and was able to collaborate with other developers in order to increase the quality of the project

Foundation for Apps
I developed an AngularJS architecture for this rapid application prototyping framework. I collaborated with Zurb's best designers to create an easy-to-use toolkit for designers to build interactive AngularJS prototypes that could also be used by developers to further build on.


A social media website for developers to chat, ask questions, and look for work. I worked on an initial link-sharing feature and feed similar to how Reddit or HackerNews work which included backend work for storing the data, tagging, implementing search, and scraping submitted sites to retrieve an image, description, title, and other data for displaying to users utilizing C#.

I also worked on the voting part of the feature, structuring CSS for the entire site, and building KnockoutJS views to display the feed and the data.

PUCL Podcast Website

A niche podcast website that I fully redesigned from scratch, built in WordPress with a custom SASS/CSS framework I wrote on top of a custom WP theme, and deployed to a Digital Ocean server I created and supported for several years.

I worked on solving UI issues and performance problems present in the previous iteration to provide the best experience for visiting users.


CSS, Elixir, Sass, PHP, TypeScript, JavaScript, Ruby, C#, GraphQL


Bootstrap, Redux, Angular, Phoenix, AngularJS, Symfony, Ruby on Rails (RoR), Laravel, Knockout (Knockout.js), Cypress


Node.js, React


Adobe Photoshop, Adobe Illustrator, Vim Text Editor, Tmux, Gulp, Vagrant, Chef, Puppet, Ansible, CircleCI


WordPress, Linux, Visual Studio Code (VS Code)




OCR, HubSpot

2010 - 2012

Bachelor's Degree in Computer Science, Physics, and Math

University of Houston - Houston, TX