Lucas da Costa

Engineering @Resend | Published author, public speaker and YC Alum

Founder

Briefer· Summer 2023🇧🇷 São Paulo, Brazil

in LinkedIn 𝕏 @thewizardlucas

2025Engineering· Resend

Founder · since 2022

Company

Resend

Role

Engineering

current

Stage

—

no public source

Raised

—

no public source

Based

San Francisco Bay Area

current

Founder / co-founder — the company's markEmployee / research role

Source: LinkedIn work history

Profile coverage5 of 7 · missing posts, contact

Briefer

The collaborative data platform.

Summer 2023

Experience

Career

Resend
Engineering · San Francisco Bay Area · 2025 – Present
2025
Briefer (YC S23)
Founder
Founder & CEO · São Paulo, Brazil · 2022 – 2025
2022
Elastic
Senior Software Engineer · Greater London, England, United Kingdom · 2021 – 2022
2021
Converge
Software Team Lead · Greater London, England, United Kingdom · 2020 – 2021
2020
Converge
Software Engineer · London, United Kingdom · 2017 – 2020
2017
Diffia
Software Engineer · Florianópolis, Brazil - Remote work to Oslo, Norway · 2017
2017
Shaw and Partners
Software Engineer · 2016 – 2017
2016
myTapp
FullStack Developer - Intern · Greater Florianopolis · 2016
2016
Hydra Systems
Development Intern · 2015 – 2016
2015
Hydra Systems
QA Intern · 2014 – 2015
2014
SeTIC - UFSC
Network Intern · 2013 – 2014
2013

Bio

I'm the founder and CEO at Briefer. Previously, I worked as a senior software engineer at Elastic and led software engineering teams at an early-stage startup in London. I used to maintain large OSS projects like Chai.js and Sinon.js and contributed to many others, including Jest. As an author, I wrote "Testing JavaScript Applications," published by Manning. I've also spoken in more than ten countries, and my content has been voluntarily translated into more than seven languages.