Hey! I'm

Lair Júnior (La-ear)

Nice seeing you here! :D

Founder @ Go Champs

Software Engineer

former Googler

former ThoughtWorks

tl;dr

Building software since 2008, basketball since I was 10 — both taught me the same lesson: show up, keep learning, play for the team.

Today I'm building Go Champs, a tournament platform for sports organizers, and helping startups ship reliable software.

About me

Skills

  • JavaScript EXPERT
  • Elixir EXPERT
  • Ruby ADVANCED
  • Dart ADVANCED

Practices

  • AI adoption for business EXPERT
  • Test-driven craftsmanship EXPERT
  • Built to last EXPERT

Bio

I'm a software engineer, entrepreneur, and lifelong basketball player passionate about building products that create meaningful impact.

For more than 15 years I've designed and built digital products — from startups to companies like Google, ThoughtWorks, and Checkr. Along the way I learned great software comes from understanding people first, technology second.

Today I split my time growing Go Champs, consulting with startups on architecture and technical leadership, and mentoring engineers and product builders. I'm especially passionate about functional programming, Extreme Programming (XP), and building healthy engineering cultures rooted in collaboration and simplicity.

Outside of code, basketball has shaped how I think about teamwork, discipline, and resilience since I was 10 — Go Champs exists because I wanted to combine both worlds.

Projects

Go Champs!

open-external

Go Champs! is a dynamic tournament app designed to streamline the organization and management of sports events.

With a user-friendly interface and powerful features, the platform caters to a community of passionate sports enthusiasts.

Currently, Go Champs! enjoys steady engagement, attracting around 100k unique accesses per month, making it a go-to resource for players and organizers alike.

TypeScript
React
Elixir
LiveView
Nightwatch.js
Postgress

e-comvida

open-external

To support restaurants during the COVID-19 closures, we developed an app that connects local eateries with customers for takeout and delivery options.

The app offers a seamless experience for ordering, allowing users to browse menus, place orders, and pay online.

This initiative helped restaurants maintain business continuity and provided customers with access to their favorite meals safely and conveniently.

TypeScript
React
Firebase

Work

Lead Software Engineer

Jan 2025 - Jul 2026
Python
Go
AWS

Shippo

  • Technical lead for the migration of major carrier integrations from legacy SOAP to modern REST APIs (Deutsche Post, FedEx);

  • Owned the roadmap and execution strategy for the FedEx REST rollout, a top-3 carrier by platform usage, under strict deadlines;

  • Designed phased migration strategies with backward compatibility to mitigate operational and revenue risk while modernizing integration architecture;

  • Aligned engineering, product, and external carrier stakeholders to deliver zero-disruption migrations;

Lead Software Engineer

Oct 2022 - Dec 2024
TypeScript
Ruby
React

Checkr

  • Led the development of a configurable driving screening solution, unlocking customer deals and driving an opportunity for $1M in new revenue;

  • Led automation of the driving screening disputes process, reducing manual intervention by 30% of disputes and generating $1.63M in annual savings, while cutting dispute turnaround time from 5 days to under a minute;

  • Led the establishment of team guidelines and routines that improved delivery efficiency by 20% and increased test coverage from 60% to 75% using automated testing tools;

  • Coordinated cross-functional initiatives for new product development;

Sr. Soft Engineer

Feb 2019 - Oct 2022
TypeScript
Dart
AngularJs

Google - via EPAM

  • Redesigned the internal CMS tool's user interface to enhance user experience with intuitive navigation, responsive design, and interactive elements, reducing loading time from 3 minutes to a few seconds and significantly increasing user satisfaction and engagement;

  • Enhanced internal libraries to support Three.js extensions, enabling 3D rendering capabilities within the platform and accelerating the development of 3D features by 80%;

  • Decreased code complexity by replacing null API data manipulation with default value assignment, which reduced error handling code by 90% and improved maintainability;

  • Created custom form fields using Material Design components, enhancing user experience with improved styles and smooth animations, resulting in significantly higher user engagement;

Lead Software Engineer

Mar 2016 - Jan 2019
TypeScript
Ruby
React
NodeJs

ThoughtWorks

  • Led the migration of a real-time economic portal with 50M monthly pageviews, resulting in increased user engagement and improved performance metrics;

  • Designed a CMS that enables developers to easily create web components, enhancing page customization and streamlining the process for editors;

  • Contributed to building a high-quality software delivery pipeline that facilitated the deployment of software up to nine times a day;

  • Developed a higher-order component (HOC) to streamline the resolution of REST API dependencies for React components improving development speed;