ClassDojoEngineering

We are shipping 4 drawing modes for letter practice in @ClassDojo Sparks.  Why? Because handwriting is crucial for reading development. It activates motor memory that helps kids internalize letter shapes.  Here's how we're making it progressively challenging:

One of the best things about using web tech to build a game is how easy it is to get multiple people playing together. No app installs necessary. Brian gets into how we did that in the talk.

Check out Brian's presentation when the video posts here: schedule.gdconf.com/session/web-ba…

Brian Did an amazing job at #GDC2025 talking about how we build Dojo Islands using web tech. We got a lot of questioning looks when we said we wanted to build a 3D game with web, but a few years in, things are looking great.

@commoncog We've written about how we automate the data side of this process, so that we can run the process weekly, without added work on the teams: engineering.classdojo.com/2025/03/19/aut…

At ClassDojo, we're obsessed with giving every kid on earth an education they love. One way we do that is to dig deep with data on what our customers experience. With some inspiration from @commoncog we run a AMZ style business review (WBR), powered by our amazing data eng team.

Huge shout out to @peter_skov, @chris_marotta, @marianopelaez for designing the experience. And special one for the amazing art 😍 @skwirrol

18,957 backend tests, up from 2000 9 years ago. This is how we've kept them fast, finishing in under 6 minutes: engineering.classdojo.com/2024/12/13/bac…

Collaboration in engineering is awesome! @GreggCaines wrote up some patterns that we try to follow to collaborate on our most important priority. Check 'em out! engineering.classdojo.com/2022/11/22/pat…

Ed tech startup ClassDojo spent 11 years winning over teachers with its classroom app, today reaching 51 million kids. Now valued at $1.25B by Tencent, ClassDojo's unveiling its next act: an ambitious virtual world it claims will come parent-approved. forbes.com/sites/alexkonr…

Up to a shell scripting challenge? How about editing 200 files without opening your editor? You might be surprised how easy it is! #bash #perl engineering.classdojo.com/2022/01/13/edi…

P.S. the combination of @HAProxy with Consul and Nomad (@HashiCorp) made this incredibly simple to do!

Inspired by @martinfowler and @thoughtworks, we've been running a canary-based deployment pipeline for 8 years now, and it has let our engineering team move quickly & safely. Here's how we've made that happen: engineering.classdojo.com/2021/11/02/can…

Categorizing bugs using P1, P2, P3, etc. can be a pain! We like the system we have instead: engineering.classdojo.com/2021/09/30/p1-…

Fred and Amaury just committed an amazing work on #QUIC+HTTP/3 in #HAProxy 2.5! They're far too humble to admit it in part due to many remaining limitations and bugs, but here you can already see curl-7.80 ->HAProxy-cde911231 ->Apache-2.4 at work with H3 translated to H2! Kudos!

@WillyTarreau Congratulations and thanks for all the hard work @WillyTarreau & the #HAProxy team! We use HAProxy at #ClassDojo and it has been a rock-solid piece of our infra - helping provide education to kids all around the world 🌎

Super happy to see @classdojo is still being so positively received! This really is the quickest way of us getting those messages out to you 👍

Happy #BacktoSchool2021 from the ClassDojo engineering team 😃 it's been a fun summer of scaling servers & databases. Read more about how we support every #classdojo #classroom around the world on our blog: engineering.classdojo.com #javascript #DevOps #edtech #golang

Using redis to back your distributed rate limiter? We found a way to 40x improve our redis performance! engineering.classdojo.com/2021/08/25/eve…

What if you had a huge set of data and you needed to count how many distinct items were in it? HyperLogLog! #Algorithms #DataScience engineering.classdojo.com/2021/07/23/hyp…