Jan Grzesik

Cloud & Product Engineer @checklyhq ex @estimote (YC S13) mountain biker, cat owner

[Jan Grzesik @jan_grz]

@holman 1969: humans land on the moon with 4kB of RAM
2021: humans can't do laundry without a data-center

[Jan Grzesik @jan_grz]

In the early 1960s, Paul Baran designed the internet so it would have no single point of failure—built like a fish-net of resilient routes. 

Fast forward to 2025: our biggest single point of failure is … us-east-1. 🤦‍♂️

[nixCraft 🐧 @nixcraft]

AWS US-EAST-1 is down. A major AWS outage has taken down several popular services worldwide, including Signal, Fortnite, Alexa, Snapchat and many more. The specific cause of the service outage is currently unclear, according to AWS and they are working on fix.

[Jan Grzesik @jan_grz]

@JeffreyBiles Would you recommend the book? Does it contain practical examples, or hints on actual engineering?

[Jan Grzesik @jan_grz]

Glad to have been part of Checkly for the last 4 years. From a two-pizza operation 🍕🍕 to Series B🤑!

[Hannes Lenke @HLENKE]

Today, I'm thrilled to announce @checklyHQ's $20M Series B, led by @balderton, @Accel, and @CRV.

But there is one more thing: the next chapter of Checkly as a monitoring tool. 👇

Our mission at Checkly is to enable engineers to detect and resolve issues 10x faster. 🚀

[Jan Grzesik @jan_grz]

@KayRooze @ThePrimeagen Our runners rely heavily on AWS services. We also learned that dividing the app into multiple smaller modules can lead to duplicated dependencies and discrepancies in versions. We learned that AWS SDK for JS is full of surprises - it's worth optimizing it

[Jan Grzesik @jan_grz]

@jesselyu Apps are hard but hardware is just exponentially harder

[Jan Grzesik @jan_grz]

What the hell happens in ca-central-1c? 🤣

[Jan Grzesik @jan_grz]

Giving thanks to @tameimpala for all the music. This year I couldn’t stop listening to Whiplash. #SpotifyWrapped https://t.co/0nDfGAT0x4

[Jan Grzesik @jan_grz]

@brendon_rogers Well... good morning to the Auth0 on-call team 😆

[Jan Grzesik @jan_grz]

Auth0 has been a significant outage for the last 40 minutes, even their dashboard is not loading, but status page says "all good" 🤣

[Jan Grzesik @jan_grz]

What if Auth0 is using Auth0 for authentication on their status page? 🤣🤣🤣

[Jan Grzesik @jan_grz]

@nucro send btc

[Jan Grzesik @jan_grz]

Auth0 edge network is down "Internal Edge Error"

[Jan Grzesik @jan_grz]

The root cause for the Auth0 down is Cloudflare. CF has just deployed a fix, but it doesn't seem to work 😢

[Sergiusz Górski @thenitrozyniak]

Dobra, teraz na poważnie.
Nie spierdol tego @donaldtusk
#Wybory2023

[Checkly @checklyHQ]

📣Big News! Checkly has been recognized in @Gartner_inc's 2023 Cool Vendors in Monitoring and Observability report, following our recent features in two Gartner Hype Cycles.

A milestone for #MonitoringAsCode!

Read more: https://t.co/N9QkF6kfyc

[Jacek Migdal @jakozaur]

@jan_grz made my day!

Instead of my home grown scripts and sheets, he wrote an amazing free app to calculate Polish capital gain taxes https://t.co/nLv5azGYET from platforms such as Degiro.

https://t.co/Xiw2iysR4U

[Jan Grzesik @jan_grz]

Actual picture of @stefanjudis and a "Demo-god" during our live stream...
The command worked just fine EVERY SINGLE TIME in the past😅
https://t.co/yMFk7k3Gnm

[Jan Grzesik @jan_grz]

Thanks for the support Daniel! I'm very proud to present the results! It took a lot of hard work from the talented team you helped me build! Go Team Koguma🐻🇯🇵!

[Daniel Paulus @Daniel1Paulus]

our very own @jan_grz is live on youtube presenting what he and his team have built.
https://t.co/E5ooDIZO3w

[Checkly @checklyHQ]

And that’s a wrap on #ChecklyLaunch week day two!

If you’d like more details on the GA of native Playwright Test support, @jan_grz has penned a detailed blog post with extra info. 🎭✍️

Blog post link below! 👇

https://t.co/HeeT9Y7oBA

#playwrightweb #monitoring #SRE #testing

[Checkly @checklyHQ]

Only 1 hour to go until our next LIVE #ChecklyLaunch Week 2 YouTube session today at 9am PT / 6pm CET!

@stefanjudis chats with @jan_grz about the GA of native Playwright Test support.🎭📺

Save your spot and join us!👇
https://t.co/5ugdiaGSWZ

#playwrightweb #monitoring #SRE