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Amazon DevOps Engineer Coding Questions

40 practice questions for Amazon DevOps Engineer interviews

Amazon DevOps engineer interviews cover CI/CD pipelines, infrastructure as code, container orchestration, monitoring, and incident response procedures.

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coding Hard Verified Question #1

1. Binary Tree Cameras


Category: Binary tree coding problem
You are given the root of a binary tree. You need to install the minimum number of cameras on the tree nodes such that every node in the tree is...
Input: Binary tree
Output: Integer
coding Hard Verified Question #2

2. [CodeSignal] Warehouse Emergency Deliveries


Category: Array coding problem
Amazon has opened a new warehouse recently. There are no products in the warehouse currently. The warehouse is under inspection for n days. The...
Input: Array
Output: Integer
coding Hard Verified Question #3

3. [CodeSignal] Permutation Sorter


Category: Combinatorics coding problem
Amazon engineers are testing a new tool, the Permutation Sorter, built to reorder sequences using limited operations. Given a permutation of...
Input: Integer(s)
Output: Integer
coding Hard Verified Question #4

4. [CodeSignal] Maximum Product Rating


Category: Array coding problem
The engineers at Amazon are working on a new rating system for their products. For each product, an array customer_rating is maintained for the...
Input: Array
Output: Computed result
coding Medium Verified Question #5

5. [CodeSignal] Drone Hub Travel


Category: Array coding problem
Amazon is expanding its next-generation drone delivery network, consisting of m hubs arranged in a circular ring (Hub 1 is adjacent to Hub m)....
Input: Array
Output: Computed result
coding Medium Verified Question #6

6. [CodeSignal] Minimum Security Groups


Category: Array coding problem
A financial services company has requested AWS for a private deployment of its cloud network. There are n servers in the network where the security...
Input: Array
Output: Integer
coding Medium Verified Question #7

7. [CodeSignal] Maximum Secure Deliveries


Category: Array coding problem
You are given an array deliveryLogs of size n, where each element represents the number of parts delivered in the i-th log. You are also given...
Input: Array
Output: Integer
coding Medium Verified Question #8

8. Maximum Interval Overlap


Category: Interval-based coding problem
You are given a list of closed intervals on the number line, where each interval [start, end] includes both endpoints. Find the maximum number of...
Input: List
Output: Integer
coding Hard infra #1

1. [OA] Dockerfile Optimization — Enhance the layering of a microservice deployment

In Amazon, deploying microservices efficiently is essential for performance and cost management. This task requires you to optimize a given Dockerfile to minimize the image size and improve build times.
You need to create a Dockerfile for the Go service that uses go build and makes use of multi-stage builds for optimization.
Method: optimize_dockerfile(base_image: str) -> str — Takes a base image string and returns an optimized Dockerfile as a string.
Example 1:
Input: "golang:1.17"
Output: "FROM golang:1.17 AS builder..."
Explanation: The returned Dockerfile is optimized using multi-stage builds to create a leaner image.
Example 2:
Input: "ubuntu:20.04"
Output: "FROM ubuntu:20.04 AS builder..."
Explanation: The returned Dockerfile sets up a multi-stage build appropriate for Go applications.
Constraints:
- The base image string will always be in the format of "<os>:<version>".
- The optimized Dockerfile should not exceed 500 lines.
coding Hard infra #2

2. [OA] Terraform — Manage the state of a multi-region infrastructure

In Amazon, multi-region deployments are critical for redundancy and low latency. Using Terraform, you are required to manage infrastructure in two regions for a new service rollout.
You need to write a script that initializes the state for a given Terraform configuration, allowing it to seamlessly deploy infrastructure across two regions while ensuring that state files are synchronized.
Method: initialize_state(config: str) -> bool — Initializes the Terraform state using the provided configuration string. Returns True if successful.
Example 1:
Input: "aws_instance = { region: us-east-1 }"
Output: True
Explanation: The script successfully initialized the state for the specified AWS region.
Example 2:
Input: "aws_instance = { region: us-west-2 }"
Output: True
Explanation: The script successfully initialized the state for the specified AWS region.
Constraints:
- config length ≤ 1000 characters.
- The number of regions can be up to 50.

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