employed.
ace the interview.
one puzzle at a time.
duolingo-style daily drills for google, meta & quant trading interviews. coding + quant tracks. streaks, xp, elo. get hired.
📱mobile only. no desktop version.
two tracks.
train for the interview
you're actually facing.
google & meta prep
leetcode-style intuition, no typing required
builds the fast mental models that get you through google/meta screens
- big-o analysis
- debug the code
- predict output
- data structure matching
- pattern identification
- system design
- sql
- fill the blank
- order the steps
trading floor prep
mental math, probability & logic for buy-side interviews
drills the fast-twitch intuition that trading floor screens demand
- mental math
- probability
- expected value
- sequences
- logic puzzles
- brain teasers
- market intuition
- speed approximation
how it works.
five minutes.
every day.
five game modes.
never get bored.
never plateau.
daily challenge
5 min · difficulty ramp · stay sharp
quick warm-ups first, then a tough finisher. pace yourself.
quickfire blitz
10–15s per question · speed drill · easy wins
rapid-fire easy-to-mid questions. trust your gut and keep moving.
deep think
60–90s per question · interview simulation · no shortcuts
fewer questions, much harder. reason it all the way through.
precision
30s per question · targets your weak spots · accuracy focus
mid-to-hard questions aimed at your weak spots. accuracy beats speed.
boss round
45–60s · difficulty 5 only · elite mode
every question is elite-level. no warm-ups. no mercy.
your journey.
start as an intern.
become the citadel final boss.
rank titles
streak flames
xp multipliers
elo skill ratings
every puzzle type has its own elo starting at 1000. answer correctly to climb. tracked separately for coding and quant.
friends leaderboard.
prep is better
with rivals.
invite friends, compete on xp, compare your elo ratings skill by skill. no anonymous strangers, just the people you actually want to beat.
- ✓friends-only leaderboard, not global noise
- ✓head-to-head elo comparison per skill type
- ✓share your session score to instagram stories
- ✓invite via link: friends join your leaderboard directly
tap a friend to compare elo ratings
pricing.
7 days free.
then keep the streak alive.
no free tier. you get a 7-day trial with 1 session per day. no card needed to start.
cancel anytime · billed through apple · cheaper than your morning coffee ☕
- ✓1 daily challenge per day
- ✓streak tracking + xp + levels
- ✓friends leaderboard
- ✓progress syncs across devices
- ×all 5 game modes
- ×unlimited sessions
- ×quant track
£0.43/day after trial
- ✓1 daily challenge per day
- ✓streak tracking + xp + levels
- ✓friends leaderboard
- ✓progress syncs across devices
- ✓all 5 game modes
- ✓unlimited daily sessions
- ✓pro-only elite puzzles
save £0.99/wk vs buying separately
- ✓unlimited daily sessions
- ✓all 5 game modes
- ✓pro-only elite puzzles
- ✓streak freeze protection
- ·requires base plan
save 23% on monthly · save £29.89/yr
- ✓mental math & speed approximation
- ✓probability & expected value
- ✓market intuition & options greeks
- ✓brain teasers & logic puzzles
- ✓sequences, patterns & estimation
save 23% on monthly · save £29.89/yr
all prices in gbp · subscriptions managed via apple · cancel anytime in ios settings
employed.
your next interview
isn't far away.
five minutes a day is all it takes. start your streak today.
available on ios · no web version