Senior Android Engineer at Lime

How it went

What they would tell you

How to prepare

Round by round

1. 1

   Initial Screening Call30 min

   The recruiter’s call was fairly standard. We discussed my experience, the role I was applying for. The recruiter also shared details about the team and how Lime operates. I appreciated how the recruiter explained the role’s expectations and asked about my aspirations. After the call, I received an email confirming my progress and scheduling the next round.

2. 2

   Technical Round (DSA)60 min

   This round was primarily focused on data structures and algorithms, which I expected considering the position. A JavaScript Lead from Lime conducted the interview. After a brief introduction and discussion about his role, we jumped into the coding challenge. I was tasked with solving an array-based problem in time and space complexity. I wrote the solution, making sure to optimize the code as much as possible. After solving the problem, I was asked to explain the time and space complexity. I was also asked to optimize the solution, which I successfully did with a better approach.

   • Array-Based Problem
3. 3

   System Design (Mobile Architecture)90 min

   This round, led by a Senior Architect from Lime’s platform team, focused on designing a system. I was asked to design a LinkedIn-like mobile app (a social media platform with backend services working as required). We discussed the high-level architecture, breaking down the classes, the architecture patterns (I chose MVVM), and the communication flow between components. I proposed REST APIs for user data, authentication, and CRUD operations for posts, as well as WebSockets for real-time updates (following best practices for scalable systems). The key challenge was integrating multiple data sources and ensuring scalability for millions of users. We also discussed caching strategies (using Redis) to handle high user traffic efficiently.

4. 4

   Mobile Coding Interview120 min

   The most exciting round for me, as it directly tested my Android development skills. This round involved creating a mobile app from scratch, using Jetpack Compose and Kotlin. Given Task & Approach:

   • UI Requirements: Build a feed screen displaying posts that contain images. The feed should include post titles, images, authors, and other relevant data.

   • Features: Search for posts, post details, and pagination. Tech Stack Used:

   • Kotlin, Jetpack Compose, MVVM, Dagger/Hilt, Retrofit, Coroutines, Coil for image loading, and Flows for data streams.

   • Initially, I faced issues with Hilt and Dagger dependencies, which led to some delays in the first 15 minutes. Once the issue was resolved, I quickly proceeded to develop the app. I designed the app architecture based on clean architecture principles, ensuring the separation of concerns.

   • I managed to implement pagination and smooth scrolling but didn’t fully complete the entire project. I completed about 80% of the task but explained my approach and reasoning as I progressed.

5. 5

   Project Discussion & Behavioral45 min

   This round was more about behavioral skills and a deep dive into a project from my resume. I shared a project where I built an e-commerce mobile application, focusing on the challenges I faced with performance optimization and feature integration. We discussed how I handled network issues, data synchronization, and UI optimization in that project. I was also asked about how I mentored other developers and ensured best practices like testing and code reviews.

What came up