Talend Interview Questions for Tech Professionals

About Talend

Talend is a pioneer in data integrity and data integration. This company is revolutionizing decision-making worldwide. Talend is a platform for open source data integration. It offers various services and software for big data, cloud storage, business application integration, data management, and integration. It debuted in 2005 and was the first data integration open-source software provider to operate commercially.

Talend Open Studio, now known as Talend Open Studio for Data Integration, was introduced by Talend the following year that is in 2006. Since then, they have released a wide selection of products that are well received on the market. 

Talend assists businesses in making quick decisions and moving toward a data-driven culture. This technology can transfer data to the target systems more rapidly and with improved quality.

So, if you want a career in Talend, it is required that you are prepared well. Below are the Talend interview questions that will help you to prepare better. Apart from the technical questions, you must also be aware of the general questions. 

Talend Recruitment Process

For the hiring procedure, you will have to pass through five stages. It consists of:

• Written test: You will be required to show your understanding of the Talend Open Studio tool in the written exam. You will also have to answer the question that will be there to test your adaptability. 
• Aptitude test: The aptitude exam evaluates your capacity for logical reasoning. Additionally, it will include inquiries that will evaluate your overall knowledge of your field. 
• An objective test: This is a multiple choice question. You have to select the correct answers from the different options given. 
• Technical rounds: You must demonstrate your technical knowledge of the Talend program during the technical round. It is a crucial round that will determine if you get the job. You will be asked several Talend interview questions from the technical niche. 
• HR rounds: The final round of the hiring process is the HR rounds, where you will be evaluated on your overall performance, teamwork skills, and technical value to the organization. 

Talend Interview Questions and Answers 

If you are preparing for a Talend job, then the following Talend interview questions will help you a lot to ace the recruitment process.

1. What do you mean by Talend, and in which language is it written?

Talend is a tool for managing and integrating data. It enables users to update, consolidate, and convert data in numerous business areas. Java is used to create the Talend software.

2. What do you mean by Talend Open Studio?

It is an open-source project and is built on the Eclipse RCP platform. It is often offered for on-premises deployment and enables ETL-oriented applications. This is a code generator to create Java programs and scripts for data manipulation. You can access the metadata repository holding the configurations and definitions for each Talend process through its user-friendly and interactive interface. 

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3. What are some advantages of Talend?

Talend allows companies to process business demands more quickly without manually coding. Businesses can leverage the most recent data integration features to help them stay competitive. Also, the help of real-time data integration allows the business to have quicker and remote deployment. 

4. Define the Talend Open Studio Component

In Talend, a component is a functional unit used to carry out a single action. You can easily use them with the help of drag and drop. Also, the component can be a part of the created Java code included in the job. 

5. Is it possible to remotely execute the Talend job?

Yes, it is possible to execute the Talend job remotely. For this, we have to use a command line. To do it, we must export the job and its dependencies. After that, with the help of a terminal, we can access its instruction files.

6. What is a tmap, and also explain its operations?

It is an advanced component; we can add it to Talend Studio as a plugin. tMap can convert and route data from one or more sources to destinations. The operations of tmap include the Transformation of data, data multiplexing and demultiplexing, filtering the field, and data rejection. 

7. What different kinds of schemas can Talend support?

The three main kinds of schemas supported by Talend are:

• Repository Schema: If any changes are made in this scheme, it will also be reflected in all the jobs using it. Also, you can easily be reused across numerous tasks.
• Generic Schema: Since it is not connected to any specific data source, this schema is utilized as a shared resource by various kinds of data sources.
• Fixed Schema: Fixed schema is a read-only schema. Also, they come as predefined with some of the components and are known as fixed schemas.

8. What do you mean by routines?

The reusable parts of Java code are called routines. You can quickly create custom Java code by using routines. This will assist you in improving job capacity, extending Talend studio capabilities, and optimizing data processing. There are two types of routines: user routines and system routines. Users can customize user routines by either developing new ones or modifying current ones. System routines are read-only programs that you can directly call from any Job.

9. How do you send data from a parent job to a child job using sub jobs?

A group of components or a single is connected by data flow are considered sub-jobs. There can be at least one Subjob for a Job. You must use context variables to send a value from the parent Job to the child Job.

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10. What is the difference between Elt and Etl?

ELT involves extracting the data, which is then loaded into the target systems for additional Transformation. In ETL, data is transformed after being extracted before being loaded into a target system. The amount of data in ELT does not affect processing. Processing becomes slower as data size grows since the entire ETL process must wait until Transformation is complete.

11. What function does Talend’s expression editor serve?

Expression Editor makes it simple to see and modify all expressions, including constraint statements, input, variable, and output expressions. Additionally, this editor has a dedicated view designed explicitly for writing any functions or transformations. If you need to write any necessary expressions for data transformation, you can do it right in the expression editor. Another option is to write the data transformation expressions in the Expression Builder dialog box.

12. Describe the various connections available in Talend

There are four connections available:

• Row: The row depicts the data flow. Examples of Row connections are Uniques/Duplicates, Lookup, and Multiple Input/Output. 
• Iterate: With the help of an iterate connection, you can run a loop function on files in a database entry, file directory, or rows.
• Trigger: Trigger connections establish the connection between Jobs and Subjobs specified by the Trigger's nature.
• Link: A user can send data from a table schema to Talend's ELT mapper via the Link connection.

13. How does Talend Open Studio use the outline view?

We can use Talend Open Studio's Outline View to keep track of the return values in a component. The Outline View consists of user-defined values produced by a tSetGlobal component.

14. Describe Talend's error handling

There are a few techniques to deal with errors in Talend:

• For simple Jobs, Talend Open Studio's exception-throwing mechanism is sufficient. It is shown as a red stack trace in the Run View. 
• We can use the Component Ok/Error and Subjob Ok/Error links to point the error toward an error handling procedure,
• The simplest method of addressing an error is to provide a Subjob that should run if an error occurs. 

15. Distinguish between Talend Open Studio for Big Data and Talend Open Studio for Data Integration

Talend For Data Integration is the superset of Talend Open Studio for big data. Along with extra features like support for big data technologies, it includes all the functionality Talend Open Studio offers for data integration. To put it another way, Talend Open Studio for Data Integration generates Java codes, whereas Talend Open Studio for Big Data generates MapReduce programs.

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16. How can you access global and context variable?

Click Ctrl + space key, to access both global and context variable.

17. What is MDM in Talend Open Studio? 

MDM stands for Master Data Management. With the help of MDM, an organisation can build and manage a consistent, single and accurate view of the enterprise data. MDM increases business value by improving operational efficiency, planning and regulatory compliance, and marketing effectiveness.

18. What is the use of Expression Editor in Talend?

Expression Editor in Talend enables us to view and edit expressions like output, input, and constraint statements. This editor includes a dedicated view of writing any functions or transformation. The expression needed for the data transformation can be written easily using the expression editor.

19. What is the process of scheduling the Job in Talend?

First, export the Job as a separate program. Then you should use the OS’ native scheduling tools like Windows Task Scheduler, Cron, etc. to schedule your tasks.

20. Is it possible to change the code generated directly in Talend?

No, we cannot change the generated code directly in Talend open studio.

Talend MCQ interview questions

Here are some of the top multiple choice questions to practice for your Talend job interview. 

1. From which tab in component view would you specify the component label in Talend

i) View

ii) Advanced settings

iii) Basic settings

iv) Documentation

2. tMap offers following join model in Talend tool

i) Left Outer Join 

ii) Right Outer Join                                   

ii) Inner Join   

iv) Full Outer Join                                          

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3. How can you access parameters in the Global Map in Talend ETL tool?

i) globalMap.put(“Key”, Object)

ii) globalMap.get(“Key”, Object)

iii) globalMap.put(“key”)

iv) globalMap.get(“key”)

4. What is the use of a tReplicate component? 

i) To copy the input row to an output row without processing it

ii) To duplicate a sub job

iii) To duplicate the configuration of an existing component

iv) To send duplicates of an output row to multiple target components

5. How can you see the configuration of an error message for a component in Talend studio?

i) From the errors view

ii) Right-click the component and then click show problem

iii) Hover the mouse over error symbol in the design workspace

iv) From the problems view

6.  How do you make sure that a subjob completes before a second subjob runs in Talend?

i) Using RunIf trigger

ii) Using the main connection

iii) Using onComponentOk or OnComponentError trigger

iv) Using onSubJobOk or onSubJobError trigger

7.  How do you run a job in Talend Open Studio?

i) Click the Run button in the Run view

ii) Click the Run button in the Job view

iii) Click the Run button in the File Menu

iv) Click the Start button in the Run view

8. From which tab in component view can you specify the component label in Talend?

i) View

ii) Advanced settings

iii) Basic settings

iv) Documentation

9. Which components given below can be used to implement lookup in Talend?

i) tJoin                                                                        

ii) tLookUp

iii) tMap                                                                       

iv) tUnite

10. Choose which of the below options in design workspace suggests an error with a Talend component

i) A red ‘X’                                                                     

ii) A red exclamation point

iii) A green ‘ I’                                                                  

iv) A yellow  exclamation point

11. Where can you get the components required to create a job in Talend Studio?

1. Palette
2. Run view
3. Designer workspace
4. Repository

12. Which of these components is used by Talend to run an operation indefinitely?

1. tRunJon
2. tforEach
3. tfileWatcher
4. tInfiniteLoop

13. What does it mean in the design workspace when the Job name has an asterisk next to it?

1. The job contains an error
2. The job is currently running
3. It is an active job
4. The job contains unsaved changes

14. How do you refer to the value of Context Variable FileName while programming Talend?

1. Context.FileName
2. FileName.value
3. context.FileName
4. $context.FileName

15. How can you add a Shape to a Business Model in Talend?

1. Place it using the palette.
2. From the repository, drag it
3. Drag it out of the palette and drop it.
4. In the quick access toolbar, click.

16. MDM is short for

1. Master Data Management
2. Mock Data Management
3. Meta Data Management
4. Mobile Device Management

17. Which data type of message is serialized into by the tKafkaOutput component?

1. Byte
2. Integer
3. byte[] 
4. String[]

18. How many pieces of Java code can you add to your job using tJavaFlex?

1. Four
2. Two
3. One
4. three

How to Prepare for a Talend Interview? 

When preparing for Talend interview questions, you must have a working understanding of Talend. It is essential if you are applying for a position requiring experience. But if you're starting a fresher, you should master the fundamentals of Talend. This is a growing industry, and so many changes are happening now and then, so remember to be well updated with the trends. 

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Talend Careers

At Talend, you can apply for the following positions:

• Finance and accounting: You can collaborate on strategy development in this sector with top company leaders focusing on integration and deal execution. Additionally, you will have the chance to assess potential M&A and investment opportunities with senior company leaders.
• Information and technology: You will work directly with internal teams on needs and specifications for project work, bug repairs, and enhancements in the information and technology department. You will offer regular operational assistance, spot issues, and take necessary action. You must proactively pinpoint problems like tech debt, inconsistent data, etc., and collaborate with teams to schedule the work, fix the problem, or improve it.
• Sales: You will be in charge of the sales, and you and the sales staff must collaborate to close deals, raise profits, and cultivate long-lasting bonds with clients that will promote repeat business and brand loyalty.
• Professional services: You will assist customers in this department as they transition from on-premises to the cloud or use Talend to support their data health initiatives. Therefore, you must be familiar with data quality (DQ), data integration (DI), and big data and cloud architectures.
• Engineering and R&D: Your work at Talend will be focused on developing a solid data science platform that will help the company's teams in data engineering, product management, marketing, etc., better understand how to use the Data Cloud Platform.
• Product Management: Your job in this department will involve working with analysts, developing engaging content, mapping Talend products and use cases in innovative and exciting ways, and assisting the company with its product narrative.

Tips for Candidates

Prepare Questions for the Interviewer

It is good that you are preparing for your Talend interview questions, but you should also have some questions to ask the interviewer. 

Practice Well

One critical point in Talend interview questions is how well you have prepared. You should always take the mock tests, which will help you get some idea about the questions and get practice to finish your paper in time. Also, don't forget to practice the MCQ questions too. 

Always Carry Your Resume

Having two or three extra copies of your resume is a good idea so the interviewer can see it as you talk. Even if you are a  fresher, always carry an extra copy. 

Frequently Asked Questions 

1. What is Talend?

Talend is an open source software for data integration and management. It helps users update, convert, and merge data to generate business insights.

2. What are the prerequisites for a Talend certification?

There are no prerequisites. However, the basic understanding of data warehousing is a plus. 

3. Who should be looking for a career as a Talend developer?

Anyone ranging from a software engineer, business analyst, solution and data architect, or data analyst, to data warehousing professionals would benefit from having Talend skills.

4. In which language is Talend written?

It is written in the Java language

5. What is Talend's default date pattern?

Talend's fixed date format is dd-MM-yyyy.

6. Can you modify the Talend-generated code directly?

No, we cannot alter the generated code in Talend Open Studio directly.

7. What work does a Talend developer do?

A Talend developer guides and supports each customer along the way when integrating enormous amounts of data using Talend software. Other responsibilities include alerting source system owners to any issues with data quality, doing studies of data requirements, assisting with data flow and mapping, and more.

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Conclusion

In the current digital age, job applicants are especially interested in knowing how to answer Talend interview questions perfectly. Since Talend is gaining popularity, it will continue to be the focus of the IT industry.