ByteDance OA Questions 2021: What Candidates Actually Saw
Last updated: May 2026
8+ ByteDance online assessment questions reported by candidates who took the OA in 2021. Sourced from 1Point3Acres, LeetCode, Blind, Glassdoor, and Reddit. Data grows as new reports are added.
ByteDance OA Format in 2021
The ByteDance online assessment has followed a consistent format across multiple hiring cycles. Based on 2021 reports in the database, candidates typically see 2 to 3 algorithmic coding problems delivered through a proctored online platform (most commonly HackerRank). Some roles include additional behavioral or work-simulation components after the coding section.
Time limits reported by candidates range from 70 to 110 minutes for the full assessment. The coding problems are auto-graded, so edge case handling and runtime efficiency both matter. Partial credit is available on some platforms if your solution passes a subset of test cases.
Real ByteDance OA Questions from 2021
ByteDance OA
Hi, I have OA of ByteDance in few days.. Do anyone know what kind of question they ask in OA? Like difficulty .. ##### -------Edit------- So.. There were 4 questions in 2 hours.....
ByteDance 2021 Grad OA (eHR SWE)
I wrote the test for ByteDance SWE eHR team(enterprise services) today. OA consisted of 4 questions to be solved in 120 minutes. Didn\'t find any OAs on LC before, so...
TikTok | OA | Multiple Questions
Q1: https://leetcode.com/discuss/interview-question/406135/ibm-oa-2019-aladdin-and-his-carpet-backend Q2: https://leetcode.com/problems/construct-string-from-binary-tree/, with a step to construct the tree from [(fromNode, toNode) ...] and error checking/handling along the way
Amazon SDE-New Grad-Seattle [Offer], Bloomberg , TikTok , Apple , AWS, KLA , Lucid
Status: New grad, MS Computer Science, US Position: SDE-New Grad at Amazon Years of Experience: 0 Location: Seattle, Washington Date: December,2020 Timeline Bloomberg [Reject] Bloomberg Phone Interview - 45 mins(Aug-2020) Just started applying for jobs. I saw that...
ByteDance | New Grad 2021 | Singapore | Jan 2021 [Reject]
Status: New grad Position: Backend new grad at ByteDance Location: Singapore Applied: Mid-Oct 2020 Round 1: Online Test (Nov 2020) 4 LC Medium questions to be solved in 1.5 hr on Hackerrank. Recieved invitation for virtual...
Bytedance/Tiktok Singapore OA Dec2021
Just had oa yesterday and unable to solve any of it (Criedddddd Is there anyone can help to solve or give some hints? Example: "10001" 1 operation since s[1:3] can be flipped "1010"...
Bytedance | Online round | Singapore
Recently, i gave online test for bytedance as a graduate SDE role. Q1. Find min number of flips to make a binary string with all 1. flips can be of two operations- a)...
Bytedance | virtual onsite | anonymous location | SWE | Awaiting response
Background 3+YOE (1y not really related) MS from top 20 school in the world, not in CS Don\'t have work authorization in country of application Don\'t speak local language natively 1750 elo on Leetcode Timeline Mid January:...
Topic Breakdown (2021 OA)
Topics reported by candidates who took the ByteDance OA in 2021:
Difficulty Breakdown (2021 OA)
3
easy
1
hard
Difficulty labels are reported by candidates or inferred from LeetCode ratings.
How to Prepare for the ByteDance OA
The ByteDance OA is a timed, auto-graded coding test. Preparation is different from interview prep: you need to optimize for both correctness and speed, since partial credit requires passing test cases, not just showing reasoning.
- Practice timed sessions. Set a timer for 35 to 45 minutes per problem and simulate the real constraint.
- Focus on the topic clusters that appear most in ByteDance OA reports: dynamic programming, graphs, arrays, and strings make up the majority of reported problems.
- Read the problem constraints carefully before writing code. The constraints often reveal the expected time complexity and algorithm type.
- Use the LeakCode database to review 2021 OA questions from actual candidates. Pattern recognition across multiple sightings is a stronger prep signal than any single mock problem.
- If the OA includes a work simulation section, practice under realistic conditions. This section tests judgment and values alignment, not coding ability.
FAQ
What does the ByteDance OA look like in 2021?
Based on 2021 candidate reports, the ByteDance OA typically includes 2 to 3 coding problems and runs 70 to 110 minutes. Topics lean toward dynamic programming, graphs, arrays, and strings. Some roles include a work simulation section after the coding component.
How long is the ByteDance OA?
Most candidates report 70 to 90 minutes for the coding component. Roles with additional work simulation sections extend the total time to 110 to 150 minutes. Check your invitation email for the exact time allocation for your specific role.
What platform does ByteDance use for the OA?
ByteDance uses HackerRank or its own proprietary platform depending on the role and hiring cycle. Your invitation will specify the platform. Both platforms support multiple languages including Python, Java, C++, and JavaScript.
Are these real ByteDance OA questions?
Yes. All questions in the LeakCode database come from candidate reports on 1Point3Acres, Blind, Glassdoor, Reddit, and LeetCode. They are not AI-generated. Each question links to its source where available.
Other ByteDance OA Years
Related: ByteDance OA Hub · ByteDance All Questions · All OA Questions · Data Sources