Klaus Kazlauskas

Senior Front-end Developer @ WorkTango Inc. | React, Node.js

Toronto, Ontario, Canada

About

Senior Frontend Developer with 15+ years of experience specializing in React. Focused on enhancing user satisfaction and developer productivity through efficient and high-quality frontend development. Delivered significant results, including reducing CI/CD times by up to 75% and creating AI features that drastically cut user task times. I want to enable people to be their best selves in a healthy and safe space.

Experience

  • Senior Front-end Developer at WorkTango Inc.
    Mar 2020 - Present · 6 yrs 4 mos

    Employee engagement platform, where I mostly worked on their reporting platform. • Developed AI features that decreased the time of customer tasks from 3 days to 2 minutes • Led CI/CD improvement initiatives that reduced pipeline times by 50% and credits spent by 20% • Led the state management initiative that reduced the code written by 50% and improved code quality • Improved customer satisfaction by monitoring and fixing the top 20% errors on DataDog • Mentored and onboarded multiple engineers to our platform, new technologies, and better patterns Tech stack: React, Material UI, Redux, TanStack Query, Apollo, Node.js, Git, CircleCI, Github Actions, Jest, Turborepo, Vite, Vitest, DataDog, Gemini, Vertex AI

  • Senior Front-end Developer at TOTVS
    Oct 2018 - Feb 2020 · 1 yr 5 mos

    TOTVS is the lead in ERP solutions in Brazil. THEx is their new, well-received, web solution for hospitality to replace their old embedded one, which is the market leader. • Enabled faster deploys and better testing by reducing CI/CD time by 75% (from 20 min to 5) • Mentored teams on advanced topics including state management, design systems, and more • Partnered with the UX team to architect and rebuild the design system on Storybook from scratch • Researched and enforced best practices and patterns for testing Technologies used: Angular, RxJS, Git, Azure DevOps, Karma, Jasmine, Storybook

  • Senior Front-end Developer at Wooza
    Apr 2017 - Oct 2018 · 1 yr 7 mos

    Wooza creates solutions to sell subscriptions from the top mobile carriers in Brazil. • Led multiple tech meetings and initiatives to improve processes and developers' seniority • Led the development of a component library that improved the development speed of dev teams • Architected shared solutions, like a library of services, to remove duplicated work as well as improve development time • Migrated AngularJS applications to Angular, improving DX and reducing the app load time by 5 seconds • Created a pixel tracking solution to boost marketing strategies and revenue • Built a project generator with Node, which reduced project start-to-deploy time from 2+ days to 1 Technologies used: Angular, Node.js, Webpack, Karma, Jasmine, Azure DevOps

  • Senior Frontend Web Developer at Storm Security & Safety Systems
    Sep 2016 - Apr 2017 · 8 mos

    Storm Security is an outsourcing company • Developed a TV app, with millions of downloads, from scratch with React and Redux • Architected a video player solution for TV apps • Architected a navigation system for controllers Technologies used: React, Redux, Jest, Git

  • Systems Analyst / Full Stack Web Developer at Concurso Virtual
    Nov 2014 - Sep 2016 · 1 yr 11 mos

    Concurso Virtual is an e-commerce and long-distance learning system focused on public and governmental jobs.