Recently, many students have obtained Amazon Regarding interview opportunities for technical positions, by sorting out the latest Amazon OA experience and sharing with real candidates, we can see that mastering the rules of question types, review skills and high-frequency traps is the key to successfully passing OA. This article will conduct an in-depth analysis from multiple dimensions such as OA process, question type distribution, difficulty analysis, problem-solving skills, and practical strategies, and provide practical preparation methods based on OA experience in one-third-acre land.
Amazon OA process panorama and time management
Amazon OA typically takes the form of HackerRank / Codility / Amazon Online Assessment, the duration is about 90–120 minutes, and the number of questions is usually 2–4 programming questions that vary slightly depending on the position:
- SDE/SWE: Mainly examine algorithms, data structures and programming abilities
- Data Scientist/Analyst: In addition to programming, it also involves SQL, Python data processing and statistical analysis
- Timing suggestions:
- Question 1: 15–20 minutes, usually array or string questions
- Question 2: 20–25 minutes, medium difficulty questions (linked list/tree/hash)
- Question 3: 30 minutes, the most difficult, involving complex algorithms or data analysis
- Reserve buffer: 10–15 minutes to check and optimize
Experience shows that controlling the rhythm is more critical than the difficulty of the questions: don’t stay on the first question for too long to avoid running out of time for subsequent questions.
01. OA definition and common examination contents
Amazon's OA is usually used to screen and evaluate candidates' technical level, learning ability, and other comprehensive qualities.
- Technical positions: Focus on examining algorithms and programming abilities
- Data jobs: Focus on algorithms and data processing
- Other tests: Intelligence tests, personality tests, etc., to assess thinking styles and problem-solving abilities
02. Amazon OA real question mark
Here are some examples of common OA programming question types:
Topic 1: Arrays and Strings
Two Sum: Given an array of integers Nums And target value Target, returns the sum of the two element subscripts as the target.
Skill: Use a hash table to store accessed elements while traversing, with a time complexity of O(n).
def two_sum(nums, target):
hashmap = {}
for i, num in enumerate(nums):
if target - num in hashmap:
return [hashmap[target - num], i]
hashmap[num] = i
Topic 2: Effective brackets
descriptive: Given a file that contains only (, ), {, }, [ And ] to determine if the string is valid.
- Left parentheses must be closed with right parentheses of the same type
- The left bracket must be closed in the correct order
Topic 3: Longest substring without repeated characters
descriptive: Given a string, find the length of the longest substring that does not contain repeated characters.
03. Frequently asked questions and recommendations for OA preparation
Q1: Do I need any additional materials?
No additional materials are required, just a computer with internet access. Calculators and pen and paper are allowed for some interviews and will be communicated at the time of testing.
Q2: Is specific prior knowledge required?
In addition to algorithmic and programming skills, OA also examines basic math and logical reasoning. It is recommended that you learn about common question types and practice them in advance for the position you are applying for.
Q3: How and where do I practice?
- Official Career page for job postings
- Communities like Glassdoor, LeetCode Discuss, and others share previous years' questions and experiences
Q4: What if OA does not perform well?
Amazon usually offers up to 3 rounds of OA opportunities, and you still have a chance to get into an interview if you do well in subsequent rounds.
Q5: Are there multiple rounds of assessment for OA?
Yes, there are usually 3 rounds of OA and each round has about 5 days to complete. If you don't do well in one round, you can still move on to the next.
Q6: What happens if I extend the OA completion deadline?
Although extensions of OA completion deadlines may be requested, recruitment is on a rolling basis. Extensions may result in missed opportunities and it is recommended that each round be completed as early as possible.
Prepare for Amazon OA: Exclusive help to avoid detours
The PROGRAMHELP team consists of 7 top technical elites from world-class universities such as Oxford, Princeton, and Peking University, and 3 members who have practical experience in first-tier Internet companies such as Amazon, Alibaba, and ByteDance. We not only help candidates master the strategies for solving high-frequency questions, but also provide support in real interviews through real-time monitoring and silent prompts to ensure that answers are complete, clear and logical.
With the support of PROGRAMHELP, many candidates have successfully secured offers from their favorite companies, and if you are in need of interview assistance or interviewing services, please feel free to Contact us!
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