Motorola Senior Software Engineer Interview Questions and Answers

Q1. A scenario to create a new Android service
Ans. 
Creating a new Android service
• Define a class that extends Service class

• Override onStartCommand() method to handle service logic

• Register the service in AndroidManifest.xml file
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Q2. 2 puzzles. one was to find min no of weighs to find faulty item among 8 items and the other one was to min no of races required to find top three horses among 25 horses
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Q3. How to manage gralloc buffers
Ans. 
Managing gralloc buffers involves allocating, locking, and freeing memory for graphics rendering in Android.
• Allocate gralloc buffer using gralloc_alloc() function

• Lock buffer for reading or writing using gralloc_lock() function

• Free buffer using gralloc_free() function

• Example: gralloc_alloc(usage, width, height, format, &handle)

• Example: gralloc_lock(handle, usage, left, top, width, height, &vaddr)
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Q4. What is HIDL vs AIDL
Ans. 
HIDL stands for Hardware Interface Definition Language and is used for communication between HAL and framework. AIDL stands for Android Interface Definition Language and is used for inter-process communication in Android.
• HIDL is used for communication between Hardware Abstraction Layer (HAL) and framework in Android

• AIDL is used for inter-process communication in Android

• HIDL is more efficient and faster than AIDL
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Q5. How Android buffers are passed from application to drivers.
Ans. 
Android buffers are passed from application to drivers through shared memory and buffer queues.
• Android applications communicate with drivers through the HAL (Hardware Abstraction Layer)

• Buffers are typically passed using shared memory regions

• Buffer queues are used to manage the flow of data between application and driver

• Example: Camera application passing image data to camera driver for processing
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Q6. What happens if LINUX faces a hardware interrupt
Ans. 
When LINUX faces a hardware interrupt, it stops executing the current code and jumps to a specific interrupt handler.
• LINUX stops executing the current code and jumps to a specific interrupt handler

• The interrupt handler processes the interrupt and resumes normal execution afterwards

• Different hardware interrupts are handled by different interrupt handlers
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Q7. What is the challenge while creating multiple services in Android
Ans. 
The challenge while creating multiple services in Android is managing communication between services and ensuring proper synchronization.
• Managing communication between services can be complex and error-prone.

• Ensuring proper synchronization between services to avoid race conditions and data inconsistencies.

• Handling dependencies between services and coordinating their interactions.

• Testing and debugging multiple services ...read more
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Q8. Boot up Android sequence
Ans. 
The Android boot up sequence involves several stages including power on, bootloader, kernel initialization, system server startup, and app launch.
• Power on the device

• Bootloader loads the Android OS kernel

• Kernel initializes the system and drivers

• System server starts up and launches essential services

• Apps are launched and user interface becomes accessible
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Q9. Describe about Permission files/SE Linux policy
Ans. 
Permission files/SE Linux policy control access to resources based on rules set by administrators.
• Permission files define who can access a file or directory and what actions they can perform.

• SE Linux policy is a security mechanism that enforces rules on how processes interact with resources.

• SE Linux policy is based on labels assigned to processes and resources, determining access permissions.

• SE Linux policy can be cust...read more
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Q10. What is manifestation file and how is it used?
Ans. 
A manifestation file is a configuration file used to define the properties and settings of a software application.
• Manifestation files typically include information such as the application's name, version, dependencies, and permissions.

• They are commonly used in software development to ensure that the application runs correctly and has access to necessary resources.

• Examples of manifestation files include AndroidManifest....read more
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1. Reversing a linked list.
2. Find all substrings in a string.

Q1. Oops Concepts, DBMS, Array Manipulation, Design Patterns.
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Q2. System Design- Design an online food delivery platform
Ans. 
Design an online food delivery platform
• Identify target audience and their needs

• Create a user-friendly interface for ordering food

• Develop a robust backend system for managing orders and deliveries

• Partner with local restaurants to offer a wide variety of cuisines

• Implement a payment gateway for secure transactions

• Provide real-time order tracking for customers

• Ensure food safety and quality through proper packaging and deli...read more
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Q1. Technical Interview + Coding
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Q1. Technical Interview
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Q1. Discussion about my previous work. GPU speccific questions, C++, OS and C questions as this was for a GPU drivers role
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Q2. Bit manipulation C++
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The test was based Graph which can be solved by DP.

Q1. How you handled conflict
Ans. 
I handle conflict by actively listening, seeking common ground, and finding mutually beneficial solutions.
• Actively listen to all parties involved to understand their perspectives

• Seek common ground and areas of agreement to build a foundation for resolution

• Collaborate with others to find mutually beneficial solutions

• Maintain professionalism and focus on the issue at hand rather than personal differences
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Q2. How do you work under stress
Ans. 
I thrive under pressure by staying organized, prioritizing tasks, and maintaining open communication with team members.
• Stay organized by creating a to-do list and breaking down tasks into smaller steps

• Prioritize tasks based on deadlines and importance

• Maintain open communication with team members to delegate tasks and ask for help when needed
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It was a graph coloring problem.

Q1. Chessboard knight problem
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Q1. No one joined the interview from interview panel and it happened twice to which HR after ignoring my mails/call for long told me that since team works from Korea they don't get time. She was having very c...read more
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