Sharded
0-day streakReview

Your progress

Level 1

0 XP100 XP to level 2
0day streak
0best streak
0topics started
0cards reviewed
    Review cards

    Progress is stored only in this browser. No account is required.

    03 · Concept

    What is an API?

    You rewrite the payments service before a Flipkart-style sale. Why does no app notice?

    Play the 60-second story
    0%complete
    1. 60-second story 9 cards · 1 minOne idea per card. Tap through it like stories.(done)
    2. Quick check 3 questions · 1 minTap an answer, get instant feedback.(done)
    3. Go deeper 7 min1 estimates, 2 build-up diagrams and 4 “you’re the candidate” moments.(done)
    4. Full breakdown 20 min · 5 figuresThe complete breakdown, every number and figure.(done)

    Questions this topic answers