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Retrieval practice for engineers

You're shipping code you can't explain.

Keep the tools. Keep the speed. Sharpen the thinking.

See if you can explain this oneAnswer one question
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For teams: the same question in your Slack channel every morning. Free for one channel.

One question, your topic

The rep · JavaScriptRep 01

Two users type Café into the same form. One typed it, the other copy-pasted it out of a file name. Your database holds two different values. Why?

Your week

Over 137,000 questions.

What this is

You answer one engineering question a day from memory. Atomic Reps shows why the answer is right.

One rep a day, thirty seconds, and the thinking comes back.

  • You

    The Daily Rep every morning, courses for the parts you keep looking up, and learning games when you want a dash of fun with your reps. Every answer sharpens your skill map, and the map decides what you get next.

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  • Your team

    The same question in your Slack channel, topics you aim per squad, icebreakers you run at the top of a standup, and a Hub that shows the team's picture without anyone's score.

    See the Slack app

  • Why it works

    Reaching for an answer before you check it is retrieval practice, the best-evidenced way to keep knowledge. We grade the studies ourselves, caveats included.

    Read the evidence

Questions matched to your level as you answer. No model writes them on demand.

The manager's Hub

Your team levels up inside Slack. You pick the topics for each team.

A backend team gets backend questions, not UX ones, unless you say otherwise. Individual scores stay invisible, even to you.

Teams · 10 teams · 52 membersCreate Team

Platform

8 members6 of 9 topics in rotation
BackendDevOpsData
TemplateBackend Platform
Foundation 2/2 onthe non-negotiables for these domains
  • Git11 topicsT3
  • Testing strategies12 topicsT3
Recommended 4/4 onthe defaults for these domains
  • API design12 topicsT4
  • Databases12 topicsT4
  • Kubernetes8 topicsT4
  • Observability8 topicsT4
Explore 0/3 onopt-in stretches
  • Caching6 topics–
  • Message queues6 topics–
  • Accessibility10 topics–

Reps land on the team, or on one person you pick. You set what gets practiced, never who gets watched.

Support·Setup guide·Docs
PlanTeamSlackAcme CorpDelivery2 channels · healthyMembers52
Add to Slack
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Everything the Slack app does

Atomic Learn

Courses for the parts you keep looking up.

The curriculum you never got.

Other platforms teach the subject from the top. These go straight for the pieces you rarely use and half-remember: generics, the event loop, the cascade, the TLS handshake.

TS: tool, not tax
Frontend · TypeScript

Types That Earn Their Keep

That colleague keeps suggesting things you don't understand.

6 levels · 27 lessons
  1. IType FoundationsFree
  2. IIEscape Hatches & NarrowingFree · account
  5. VModules & EmitPro
  6. VIDeclarations & The CompilerPro
Start level I, no signup All 27 lessons
Level IIIGenerics that earn the brackets1/14

Generics · types take arguments

A generic is not a mysterious new kind of type. It is a type that takes arguments, the way a function takes arguments, and like functions, applications nest: a Box can hold another Box.

type Box<T> = { value: T };
type Pair<T> = Box<Box<T>>;

type B = Pair<number>["value"]["value"];

What is the type of B?

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Tricky to get right first time. Retry as often as you like, and your certificate grade only ever goes up. Pass every lesson and the certificate is yours to share, on LinkedIn or anywhere else.

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The industry right now.

How developers say it feels, and what the graded studies measure.

Practice that compounds.

Atomic Reps is built on retrieval practice, one of the most consistently replicated methods in a century of memory research. Every answer you give, in Slack, in games, in The Daily Rep, feeds one learning profile, and the next question lands right when you would forget.

What developers say

3,593 developers · Aug 28 2026 refresh · The human cost of AI →

  • 71%

    feel they should be producing more, because AI makes it possible.

  • 63%

    put their own coding skills on the slipping side.

  • 57%

    enjoy coding less than before heavy AI use.

  • 52%

    keep prompting past the point they meant to stop.

What the measurements say

Graded studies · every caveat printed

Every paper graded, every caveat printed · The research →

Team building

Team building that runs itself. You press start.

Three games, and nothing for you to plan. The questions are already written and kept current: you pick a topic, send one link, and the room fills.

For the person running the team

Your engineers argue about code for twenty minutes, and the new hire has met everyone. You showed up and pressed start.

Nothing to write
Ours, and re-checked as versions move. Never a deck you build the night before.
One link
Everyone joins from their own screen. Nobody installs anything.
On the calendar
Put a round on the calendar per channel once, and the room posts itself.
Every team you run
Three squads cost you the same minute as one.
Host a round A link to share · Free · No login
Three games
In Slack
Nobody else required
Every game
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Answer three questions from memory

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