The Phoenix MethodBooks and interactive practice
iOS interview prep
Swift concurrency, SwiftUI state, architecture, and the system design round senior loops add.
Senior mobile interview preparation
Prepare for the mobile interview on your calendar.
A correct answer is the entry fee. The round is scored on what happens after it: the follow-up, the constraint that changes, the trade-off you have to defend out loud.
Mike Salari Staff mobile engineer · 500+ technical interviews from the hiring side
15 years across Apple, Adobe, Cisco, Mastercard and Visa
- 500+technical interviews, run by me
- 5,000+CVs read from the hiring side
- 150+engineers helped into a new job
- 5.0from 42 reviews of the books and services
- Interviewer · question
Design the image loading for a feed of 10,000 posts.
- You · first answer
An in-memory cache in front of URLSession, keyed by URL, with a disk cache behind it.
- Interviewer · then
“The feed scrolls fast on a three-year-old phone and memory warnings start. What do you change first?”
What is scored
Whether you size the cache by cost not count, cancel off-screen work, decode off the main thread, and say which of those you would measure before touching.
Start from your platform
Four platforms, described as they are.
iOS and Android have books and interactive practice. Flutter has a question bank today, and so does React Native; the page for each says exactly what exists.
Books and interactive practice
Android interview prep
Coroutines, Compose, lifecycle, architecture boundaries, and the Android design round.
Question bank
Flutter interview prep
State management, rendering, platform channels, and the machine coding round.
Question bank
React Native interview prep
The JS and native boundary, performance, the new architecture, and state.
What the interviewer writes down
Four things get scored, and none of them is “knew the answer”.
Every guide and every book here is organised around the same four signals, because they are what separates a senior answer from a correct one.
- 01
Signal
Does the first answer say something only an engineer who has shipped this would say?
- 02
Structure
Can the interviewer follow the reasoning, or do they have to reconstruct it from fragments?
- 03
Depth
What happens at the second and third question, when the textbook answer runs out?
- 04
Judgement
When the constraint changes, does the answer change, and can you say why?
Choose by the time you have
The right material depends on the round and the calendar.
Not sure which? Answer four questions and get one recommendation with the reason for it.
Interview guides
Written from the other side of the table.
Senior and Staff loops · 12 min
Amazon mobile mock interview: practise the loop in 2026
An Amazon mobile mock interview built on Amazon's published SDE prep: assessment, four 55-minute rounds, Leadership Principles, six prompts and a rubric.
Android · 14 min
Android architecture interview questions: layers and modules
Ten Android architecture interview questions and how senior answers are scored: layers, the domain layer, UDF, Hilt, modules, navigation and testing.
Android · 12 min
Android coding interview: the tasks and how they grade
What an Android coding interview asks: the practical tasks to prepare, the algorithm round in Kotlin, and what is graded beyond a screen that works.