Lukas Cizek, Developer in Prague, Czech Republic
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Lukas Cizek

Verified Expert  in Engineering

Bio

Lukas started eight years ago as a self-taught mobile developer in Java. He found his true passion four years ago in React when it became the primary choice for many companies. At the same time, working on projects of all sizes and types, he has profiled into a senior developer with team-leading experience. Lukas focuses on delivering results that follow today's standards, and his front-end expertise goes beyond learning as he has lectured React academies and mentored other team members.

Portfolio

Full Remote Freelancing
React, Next.js, GraphQL, TypeScript, Visual Studio Code (VS Code), Jest, CSS3...
An Online Job Board
TypeScript, Razzle, Formik, Tailwind CSS, Docker, Amazon Web Services (AWS)...
Usertech
Redux, Next.js, React Final Form, Create React App, Cypress...

Experience

  • Next.js - 6 years
  • JavaScript - 6 years
  • React - 6 years
  • TypeScript - 5 years
  • Jest - 3 years
  • React Final Form - 2 years
  • Tailwind CSS - 2 years
  • Leadership - 2 years

Availability

Full-time

Preferred Environment

MacOS, Visual Studio Code (VS Code), Git, Terminal

The most amazing...

...thing was to optimize the development process, pipeline, and codebase itself in a traffic-heavy, enterprise app.

Work Experience

React Consultant

2020 - PRESENT
Full Remote Freelancing
  • Worked on project kick-offs, short-term allocations, optimizing development processes, and other consultancies.
  • Reviewed 70 thousand LOC+ codebase, highlighted various issues, optimized development process, and assessed future steps for improvement.
  • Layed foundation for the scalable project, leading and mentoring two juniors in the process, and chose the ideal development stack for the use case.
  • Helped a few startups during their crunch time with development.
Technologies: React, Next.js, GraphQL, TypeScript, Visual Studio Code (VS Code), Jest, CSS3, Page Speed Optimization, Website Performance, REST APIs, HTML, Unit Testing, Front-end Architecture, CSS, Webpack, HTML5, Ant Design, Express.js, Styled-components, Terminal, Git, Figma, Leadership, JavaScript, Prisma, Material UI, Architecture, Technical Leadership, Front-end, Storybook

Senior React Developer

2020 - PRESENT
An Online Job Board
  • Led and executed improvements across the whole codebase following the current best practices.
  • Sped up docker pipeline performance, resulting in 20% of the standard duration.
  • Introduced unit tests to the codebase and laid the foundation for the testing habits of the whole team.
  • Fixed, optimized, and maintained business-critical tracking of user events in Google Analytics.
  • Migrated to a new internal component library, suggesting many improvements during the process.
  • Implemented web message app for customers to use for communication.
Technologies: TypeScript, Razzle, Formik, Tailwind CSS, Docker, Amazon Web Services (AWS), React, Next.js, Visual Studio Code (VS Code), Jest, CSS3, Page Speed Optimization, Website Performance, REST APIs, HTML, Unit Testing, Front-end Architecture, CSS, Webpack, HTML5, Express.js, Terminal, Git, JavaScript, Material UI, Technical Leadership, Front-end, Single-page Applications (SPAs)

React Developer | Front-end Lead

2019 - 2020
Usertech
  • Led front-end team with six members, being responsible for their delivery.
  • Maintained two larger codebases, with a combined LOC of over 100 thousand.
  • Optimized many suboptimal practices across the codebase and improved multiple performance metrics.
  • Created a concrete Git Flow, resulting in a safer and consistent deployment process.
  • Decreased the size of the docker image by introducing multi-stage installation to 10% of the size.
  • Ignited a passion in other team members with open discussions about all changes and improvements.
Technologies: Redux, Next.js, React Final Form, Create React App, Cypress, Amazon Web Services (AWS), React, TypeScript, Visual Studio Code (VS Code), Jest, CSS3, Page Speed Optimization, Website Performance, REST APIs, HTML, Unit Testing, Front-end Architecture, CSS, Webpack, HTML5, Ant Design, Express.js, Styled-components, Terminal, Git, Leadership, JavaScript, Architecture, Technical Leadership, Front-end, Single-page Applications (SPAs)

React Developer | Team Leader

2017 - 2019
INVENTI
  • Led multiple projects from start to finish; the biggest team included four front-end developers and three testers.
  • Mentored juniors, both personally and technically on their professional career journey.
  • Created a Node.js project for controlling, aggregating, and evaluating a large amount of CSV data. Evaluating feeds over 10+ million items with various metrics.
  • Implemented rules and logic for Elasticsearch to effectively search over 100+ million items, resulting in what the user is expecting.
  • Taught multiple React academies that spanned multiple months with his coworker for the general public.
  • Created detailed technical offer and estimation for a customer, resulting in a successful project for the company.
Technologies: Strapi, Node.js, React, Java, Gatsby, Amazon Web Services (AWS), Next.js, TypeScript, Visual Studio Code (VS Code), CSS3, Java EE, Page Speed Optimization, Website Performance, SQL, REST APIs, HTML, Front-end Architecture, CSS, Webpack, PWA, HTML5, Progressive Web Applications (PWAs), Ant Design, Express.js, Styled-components, Terminal, Git, Figma, Leadership, JavaScript, Technical Leadership, Front-end, Single-page Applications (SPAs)

Experience

An Online Job Board

A global leader in connecting people and jobs which aims to make every workplace happier and more productive by transforming the way employers and candidates find the right fit.

I've led dozens of innovations for the platform, improved development processes, and maintained solutions on the platform.

Carvago

https://carvago.com/
Carvago is the biggest EU car online marketplace for the purchase and sale of used cars. It comes as a client-facing Next.js app and custom CMS built with CRA.

I have managed the dev team to deliver the solution and ensured the technical feasibility of UI/UX designs and improved the codebase of U+ products and apps.

Education

2013 - 2019

Master's Degree in Information Technology

Czech University of Life Sciences - Czech Republic

2015 - 2016

Bachelor's Degree in Computer Networking

Kymenlaakso University of Applied Sciences - Finland

Certifications

MAY 2016 - MAY 2017

Cisco Certified Network Professional

Cisco

Skills

Libraries/APIs

React, REST APIs, Node.js, Formik, React Final Form

Tools

Git, Create React App, Terminal, Figma, Webpack, Prisma

Languages

TypeScript, JavaScript, HTML5, CSS, HTML, CSS3, GraphQL, Java, SQL

Frameworks

Next.js, Redux, Jest, Ant Design, Material UI, Tailwind CSS, Cypress, Express.js

Paradigms

Unit Testing

Platforms

Visual Studio Code (VS Code), MacOS, Docker, Amazon Web Services (AWS), Android, iOS, Java EE

Other

Styled-components, Front-end Architecture, Architecture, Technical Leadership, Front-end, Single-page Applications (SPAs), Website Performance, Page Speed Optimization, Razzle, Strapi, Gatsby, Leadership, Progressive Web Applications (PWAs), PWA, Storybook

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