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Everything you need to clear Staff and Principal Android interviews, free. 13 deep-dive chapters, 31 real post-mortems (Snapchat, Instagram, Notion), 25 requirements-gathering problems, 26 behavioral scenarios, code review lab, mindset challenges, and spaced repetition.
Hey Product Hunt 👋
I'm Sahitya, an Engineer. Over the last few years of interviewing at
FAANG and coaching friends through Staff+ loops, I kept hitting the same
problem: the good mobile system design content was either locked behind
$500 courses or scattered across a dozen blog posts.
So I built Mobile System Design to be the resource I wish I'd had —
completely free, no signup, no paywall:
• 13 deep-dive chapters (Networking → Compose → Coroutines → Offline-first)
• 31 real post-mortems (Autopsy Lab) — diagnose actual Android failures
from Snapchat, Instagram, Notion before reading the verdict
• 25 Requirements Lab problems with a scripted interviewer that responds
to your clarifying questions
• 26 FAANG behavioral scenarios with IC calibration
• A Code Review Lab for spotting antipatterns in broken Kotlin
• Mindset Lab — see how Senior / Staff / Principal engineers think through
the same scenario
• Spaced repetition + a 3-min blind-spot diagnostic
Everything works offline once the page loads. There's also an audio mode
with 85 narrated tracks if you'd rather study on a walk.
Happy to answer any questions about the interview loops I've been through,
the content inside, or how I built it (Next.js 16, multi-provider AI
fallback for the requirements lab). Feedback very welcome!
Mobile System Design was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #37 on the daily leaderboard. Everything you need to clear Staff and Principal Android interviews, free. 13 deep-dive chapters, 31 real post-mortems (Snapchat, Instagram, Notion), 25 requirements-gathering problems, 26 behavioral scenarios, code review lab, mindset challenges, and spaced repetition.
Mobile System Design was featured in Education (78.4k followers), Tech (622.5k followers) and Career (2k followers) on Product Hunt. Together, these topics include over 194.3k products, making this a competitive space to launch in.
Who hunted Mobile System Design?
Mobile System Design was hunted by Sahitya Pasnoor. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Sahitya Pasnoor