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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 Clusters
  • Event Streaming
  • Data Pipelines
  • Fault Tolerance
  • Data Replication
  • In-Synced Replica
  • Distributed Systems
  • Message Queues
  • Stream Processing
  • Scalability

9 reasons why
9 reasons why

Adaface Kafka 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 time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

  • Understanding and working with Kafka Offsets
  • Understanding and managing In-Synced Replica
  • Configuring and maintaining Kafka Clusters
  • Designing and implementing Distributed Systems using Kafka
  • Utilizing Event Streaming with Kafka
  • Working with Message Queues in Kafka
  • Building and maintaining Data Pipelines with Kafka
  • Implementing Stream Processing using Kafka
  • Ensuring Fault Tolerance in Kafka
  • Scaling Kafka for high-volume data
  • Understanding Data Replication in Kafka
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.

View sample questions

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.

How we design questions

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?
🧐 QuestionπŸ”§ Skill


onCompletion method call

2 mins



Topics and partitions

2 mins




2 mins

🧐 QuestionπŸ”§ SkillπŸ’ͺ DifficultyβŒ› 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.

Science behind Adaface tests
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

View sample scorecard
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

Learn more

About the Kafka Assessment Test

Why you should use Pre-employment Kafka Online Test?

The Kafka Online Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

  • Understanding and working with Kafka Offsets
  • Knowledge of In-Synced Replica in Kafka
  • Experience in managing and troubleshooting Kafka Clusters
  • Understanding of Distributed Systems and their application in Kafka
  • Proficiency in Event Streaming concepts and their implementation in Kafka
  • Knowledge of Message Queues and their usage in Kafka
  • Experience in building and managing Data Pipelines using Kafka
  • Working knowledge of Stream Processing in Kafka
  • Understanding and implementing Fault Tolerance in Kafka
  • Ability to design and scale Kafka for high Scalability

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the Kafka Online Test?

  • Kafka Offsets

    Kafka Offsets refer to the unique identifier assigned to each message in a Kafka topic. They act as a pointer to the position of a specific message within a partition. Measuring this skill allows recruiters to assess the candidate's understanding of data persistence and message ordering in Kafka.

  • In-Synced Replica

    An In-Synced Replica in Kafka is a replica that is synchronized with the leader replica for a particular partition. These replicas are considered in-good-state and are used for consistent and reliable message delivery. Measuring this skill helps recruiters evaluate the candidate's knowledge of replica synchronization, data consistency, and fault tolerance in Kafka.

  • Kafka Clusters

    A Kafka Cluster consists of multiple Kafka Brokers working together to form a scalable and fault-tolerant messaging system. It provides high availability, fault tolerance, and horizontal scalability for handling large volumes of data streams. Measuring this skill enables recruiters to assess the candidate's understanding of cluster management, replication, and data distribution in Kafka.

  • Distributed Systems

    A Distributed System is a collection of independent components that work together to achieve a common goal. In the context of Kafka, understanding distributed systems is crucial as Kafka is designed to handle large-scale event streams and distributed processing. Measuring this skill allows recruiters to evaluate the candidate's familiarity with distributed system concepts such as scalability, fault tolerance, and data consistency.

  • Event Streaming

    Event Streaming involves the continuous and real-time processing of data events. In Kafka, events are represented as messages and are processed using Kafka's publish-subscribe model. Measuring this skill helps recruiters assess the candidate's knowledge of streaming data architectures, event-driven systems, and real-time data processing.

  • Message Queues

    Message Queues provide a way to decouple producers and consumers in a distributed system. In Kafka, message queues are implemented as topics where messages are stored and can be consumed by multiple consumers. Measuring this skill allows recruiters to evaluate the candidate's understanding of message-oriented architectures, decoupling of components, and asynchronous communication patterns.

  • Data Pipelines

    Data Pipelines are the systems and processes used to extract, transform, and load (ETL) data from various sources to a destination. In Kafka, data pipelines can be built using various components such as sources, connectors, and sinks. Measuring this skill enables recruiters to assess the candidate's knowledge of data ingestion, transformation, and streaming data integration using Kafka.

  • Stream Processing

    Stream Processing involves the real-time computation and analysis of data streams. In Kafka, stream processing can be performed using Kafka Streams or other stream processing frameworks. Measuring this skill helps recruiters evaluate the candidate's familiarity with stream processing concepts, such as windowing, aggregation, and stateful processing, in the context of Kafka.

  • Fault Tolerance

    Fault Tolerance refers to the ability of a system to continue functioning even in the presence of hardware failures, software errors, or other unexpected events. In Kafka, fault tolerance is achieved through data replication, leader election, and recovery mechanisms. Measuring this skill allows recruiters to assess the candidate's understanding of fault-tolerant architectures, error handling, and data durability in Kafka.

  • Scalability

    Scalability is the ability of a system to handle increasing workloads by adding resources or scaling horizontally. In Kafka, scalability is achieved through partitioning, distributed processing, and parallelism. Measuring this skill enables recruiters to evaluate the candidate's knowledge of designing and managing scalable systems for handling high-throughput data streams in Kafka.

  • Data Replication

    Data Replication is the process of creating and maintaining copies of data in multiple locations for redundancy and availability. In Kafka, data replication is used to ensure durability and fault tolerance. Measuring this skill allows recruiters to assess the candidate's understanding of replication strategies, consistency models, and data integrity in Kafka.

  • Full list of covered topics

    The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for Kafka Online Test to be based on.

    Kafka Topics
    Kafka Producers
    Kafka Consumers
    Kafka Connect
    Kafka Streams
    Kafka API
    Kafka Partitioning
    Kafka Replication
    Kafka Offset Commit
    Kafka Offset Reset
    Kafka Configurations
    Kafka Cluster Management
    Kafka Cluster Scaling
    Kafka Cluster Expansion
    Kafka Cluster Monitoring
    In-Sync Replica
    Kafka Cluster Performance
    Kafka Cluster Security
    Kafka Cluster Resilience
    Event-Driven Architectures
    Event Serialization and Deserialization
    Message Queue Concepts
    Message Queue Mechanisms
    Message Queue Design Patterns
    Data Pipeline Architectures
    Data Integration with Kafka
    Developing with Kafka Streams
    Stream Analytics with Kafka
    Processing Guarantees in Kafka
    Kafka Fault Handling
    Kafka Performance Tuning
    Scalability in Kafka
    Kafka Partition Assignment
    Kafka Data Replication
    Kafka Mirroring
    Data Backup and Recovery in Kafka
    Kafka Monitoring and Alerting
    Kafka Security Best Practices
    Kafka Admin Operations
    Kafka Data Compression
    Kafka Data Encryption
    Kafka Authentication and Authorization
    Kafka Message Serialization
    Kafka Message Compression
    Kafka Message Routing
    Kafka Message Retry
    Kafka Error Handling
    Kafka Message Delays
    Kafka Message Filtering
    Kafka Event Ordering
    Kafka Event Timestamping
    Kafka Event Replay
    Kafka Event Eviction

What roles can I use the Kafka Online Test for?

  • Kafka Developer
  • Kafka Administrator
  • Senior Kafka Developer

How is the Kafka Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

  • Knowledge of Data Replication techniques in Kafka
  • Experience in working with Kafka Connect and its various connectors
  • Familiarity with Kafka Streams and its usage for real-time processing
  • Understanding and applying Kafka Security mechanisms
  • Proficiency in monitoring and optimizing Kafka performance
  • Experience in handling and managing Kafka Topics and Partitions
  • Knowledge of Kafka Message Serialization and Deserialization
  • Understanding and implementing Kafka Message Compression techniques
  • Experience in integrating Kafka with other Big Data technologies like Hadoop and Spark
  • Proficiency in managing Kafka Consumers and Producers for efficient data processing
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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

Kafka Hiring Test FAQs

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. Here's a quick guide on how you can request a custom test.

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
  • Screen proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser
  • Copy paste protection

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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