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About the test:

The Kafka Online Test uses scenario-based MCQs to evaluate candidates on their knowledge of Apache Kafka, including their proficiency in working with message queue, stream processing, and distributed systems. The test also evaluates a candidate's familiarity with Kafka producer and consumer workflows, partitioning and replication, and performance optimization. The test aims to evaluate a candidate's ability to work with Kafka effectively and design and develop scalable and fault-tolerant messaging systems that meet real-time data processing requirements.

Covered skills:

  • Kafka Offsets
  • Kafka Tools
  • Log Retention
  • In-Synced Replica
See all covered skills

9 reasons why
9 reasons why

Adaface Kafka Online Test is the most accurate way to shortlist Kafka Developers

Reason #1

Tests for on-the-job skills

The Kafka Online test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves expensive engineering time by filtering out unqualified candidates.

The Adaface Kafka online test screens candidates for the typical skills recruiters look for in a Kafka developer:

  • Understanding of message delivery and durability guarantees
  • Experience working with producer API
  • Experience using Record headers
  • Familiarity with command line tools
  • Expertise in Kafka brokers, zookeepers, KSQL, KStream and Kafka Control center
  • Hands on experience working on Kafka connectors such as MQ connectors, Elastic Search connectors, JDBC connectors, File stream connector, JMS source connectors, Tasks, Workers, converters, Transforms

The insights generated from this assessment can be used by recruiters and hiring managers to identify the best candidates for the role. Anti-cheating features enable you to be comfortable with conducting assessments online. The Kafka developer test is ideal for helping recruiters identify which candidates have the technical skills to do well on the job.

The Kafka Online Test helps you screen candidates- interview only candidates with proven hands-on technical expertise in Kafka development and programming. The idea behind this online Kafka quiz is to help you assess on-the-job Kafka concepts, coding and debugging skills with just one test.

Reason #2

No trick questions

no trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface ->
Reason #3

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

These are just a small sample from our library of 10,000+ questions. The actual questions on this Kafka Online Test will be non-googleable.

🧐 Question


onCompletion method call
Do you know when the onCompletion() method is called?


Topics and partitions
Our ecommerce website, Dove Bonito maintains two topics: 1 high volume topic, "purchase" with 5 partitions and 1 low volume topic "customer" with 3 partitions. The team wants to do a stream-table join of these topics. What would you recommend?


What is an adequate topic configuration for the topic word-count-output?
🧐 Question🔧 Skill


onCompletion method call
2 mins


Topics and partitions
2 mins


2 mins
🧐 Question🔧 Skill💪 Difficulty⌛ Time
onCompletion method call
Medium2 mins
Topics and partitions
Easy2 mins
Medium2 mins
Reason #4

1200+ customers in 75 countries

customers in 75 countries

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!

Brandon Lee, Head of People, Love, Bonito

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment Kafka Online Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the Kafka Online Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

invite candidates
Reason #7

Detailed scorecards & benchmarks

Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

test completion rate
Reason #9

Advanced Proctoring

About The Kafka Developer Role

Apache Kafka is a framework implementation of a software bus using stream-processing. Apache Kafka® is an event streaming platform used by more than 30% of the Fortune 500 today.

Kafka is primarily used to build real-time streaming data pipelines and applications that adapt to the data streams. It combines messaging, storage, and stream processing to allow storage and analysis of both historical and real-time data.

Typical Kafka Developer responsibilities include:

  • Perform independent functional and technical analysis for major projects
  • Perform data related benchmarking, performance analysis and tuning
  • Recommend best approach suited for data movement from different sources to HDFS using Apache/Confluent Kafka
  • Develop, enhance and maintain web applications
  • Lead the identification, isolation, resolution and communication of problems within the production environment
  • Perform code and unit testing for complex scope modules, and projects

What roles can I use the Kafka Online Test for?

  • Kafka Developer
  • Hadoop Developer with Kafka

What topics are covered in the Kafka Online Test?

In a queuing, a pool of consumers may read message from the server and each message goes to one of them.

Kafka server

ISR stands for In sync replicas. They are as a set of message replicas which are synched to be leaders.


Replication of message in Kafka ensures that any published message does not get lost and can be consumed in case of machine error, program error or software upgrades.

Message offset
Kafka Producer API
Partitioning Key

The messages in partitions are given a sequential ID known as an offset, and the offset is used to identify each message in the partition uniquely.


Kafka MirrorMaker provides geo-replication support for your clusters.


In this model, messages are broadcasted to all consumers Kafka caters single consumer abstraction that generalized both of the above- the consumer group

Avoiding duplication
Consumer Group
Record headers
MQ connectors
Elastic Search connectors
JDBC connectors
File stream connector
JMS source connectors
Kafka Rest proxy
Redundancy cluster
Singapore government logo

The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.

reduction in screening time


Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

  • Non-googleable questions
  • IP proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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40 min tests.
No trick questions.
Accurate shortlisting.
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