interview-prep - GrindLoop: Android & iOS Interview Prep

Why Gson Returns Null Fields Only in Your Release Build

September 28, 2026 by Arsam

Code editor on a dark monitor showing JSON parsing code, illustrating Gson null fields in an Android release build

A Kotlin data class parsed by Gson works in debug and comes back null in release. Here’s the two-bug reason (R8 plus Gson skipping your constructor), the fix, and the interview answer.

The Behavioral Round Is Scoring the Gaps You Leave in Your Story

September 28, 2026 by Sara

Three colleagues talking through a project in an office, the kind of cross-team working relationship behavioral interview scoring often probes

Behavioral interview scoring often turns on what your story leaves out. One cross-team Android story, told with the gap open and then closed, and why the second version scores better.

Found the Bug in Your Android Debugging Interview and Still Didn’t Pass?

September 28, 2026 by Hass

Laptop showing a code editor next to a mobile emulator, the setup for an Android debugging interview

In an Android debugging interview, the first green test is often only the midpoint. What the bug squash round scores, and the traps that sink candidates who find the bug.

The Behavioral Round Has a New Question, and It Isn’t About Whether You Use AI

September 27, 2026 by Sara

Close-up of a code editor with an AI assistant menu for debugging, the kind of AI-assisted work a behavioral interview AI question asks about

The behavioral interview AI question asks how you decide what to delegate, what you check and when you override the model. Here’s one full Android answer and why it works.

Got an Exploding Offer While Your Other Android Loops Are Still Running?

September 27, 2026September 27, 2026 by Hass

Candidate marking an exploding offer deadline on a desk calendar while other interview loops are still running

An exploding offer usually lands while slower loops are still at the committee or team-matching stage. How to buy time, what to tell the other companies, and how to sequence loops so it doesn’t happen again.

You Probably Have a Conflict Story. You’re Just Not Calling It One.

September 27, 2026September 26, 2026 by Sara

Two colleagues having a serious discussion while reviewing work on a laptop, the kind of ordinary disagreement a conflict interview question is asking about

One answer keeps showing up when engineers get a conflict interview question. They get asked about a time they disagreed with a coworker. They say, “Honestly, I’ve never had a real conflict at work.” It’s usually sincere. It usually comes with an explanation. The team was simply too aligned, too smart or too professional for … Read more

Why Wrapping a Suspend Function in withContext(Dispatchers.IO) Is Usually a Mistake

September 27, 2026September 26, 2026 by Arsam

Rows of colored thread spools, representing Kotlin coroutine dispatchers and threads in a withContext(Dispatchers.IO) call

Kotlin’s suspend functions carry an implicit promise. A main-safe suspend function takes care of its own threading, no matter who calls it. In real codebases, callers break that promise constantly. A common defensive habit is wrapping every call that might touch disk or network in withContext(Dispatchers.IO). Developers do it even when the function being called … Read more

Stuck in Team Matching After Passing the Android Loop? The Hiring Manager Call Has a Clock, Not a Rubric

September 26, 2026 by Hass

Engineer on a video call with a hiring manager during team matching

Team matching sits between a passed interview loop and an offer, and a candidacy can expire there. How the stage works at Google and Meta, and how an Android engineer should run it.

Why “Too Detailed” Gets Engineers Rejected in the Behavioral Round

September 26, 2026September 25, 2026 by Sara

A man in a white shirt gesturing while explaining something on a laptop video call, like a candidate giving a too detailed behavioral interview answer

Told your behavioral interview answer was “too detailed”? Here’s what over-explaining signals to the interviewer, and the answer order that fixes it.

Why Your Predictive Back Animation Gets Stuck When the Gesture Is Canceled

September 27, 2026September 25, 2026 by Arsam

Hand holding an Android phone with a blank screen, illustrating a predictive back gesture animation in Jetpack Compose

The predictive back gesture is no longer optional. For apps targeting Android 16 (API level 36), predictive back system animations are enabled by default. Since August 31, 2026, Google Play requires new apps and app updates to target API level 36. So any app still shipping updates is affected. If your app has a custom … Read more