Talend Training & Certification: A Guide for ETL Testers

Talend is a popular ETL and data integration platform, especially with mid-size companies and teams that want a visual, Java-based ETL tool. If you're an ETL tester, understanding how Talend jobs work makes it much easier to design test cases that catch real defects.

This guide covers Talend training options, Talend certification after the Qlik acquisition, and how to test Talend jobs with SQL.

What Changed with Talend

• Qlik acquired Talend in 2023. Talend products, training, and certifications are now part of Qlik's data integration portfolio.
• Talend Open Studio was discontinued in 2024. The free, open source edition that many people learned on is no longer maintained. Older versions still circulate, but new learning should target the current Qlik Talend products.
• The concepts are unchanged. Jobs, components (tMap, tJoin, tFilterRow, tAggregateRow), and contexts work the same way — and so does testing them.

Talend Training Options

1. Official Qlik / Talend training

Qlik provides official Talend learning paths and instructor-led training. It's the most current and certification-aligned option, and is often included for customers with Talend subscriptions — check whether your employer already has access.

2. Talend course on Udemy and similar platforms

Affordable self-paced Talend courses teach job design with tMap, joins, lookups, and file/database components. Great for learning the interface on a budget; check the product version and last update date.

3. Documentation and community

The official Talend documentation and Qlik Community are free and cover every component in detail.

4. ETL testing course + Talend

Talend courses teach you to build jobs. ETL testers also need to validate them. Pair a Talend course with an ETL testing course so you can prove a Talend job loaded the right data — that's the skill interviewers test.

Talend Certification

Talend certifications (such as the Talend Data Integration developer certification) are now offered through Qlik's certification program. Exam names, formats, and prices change, so check Qlik's certification site for the current list before you prepare.

Is a Talend certification worth it for ETL testers?

• Yes, if you're targeting a company or consultancy that runs Talend and lists it in job descriptions.
• Not essential for most ETL testing roles, which focus on SQL, data warehouse concepts, and test design.

Compare all your options in our ETL testing certification guide.

How to Test Talend Jobs

Key Talend components to test

Test 1: tMap reject flow completeness

-- Main output + reject output must equal source rows
SELECT
  (SELECT COUNT(*) FROM stg.orders) AS source_rows,
  (SELECT COUNT(*) FROM dw.fact_orders WHERE load_date = CURRENT_DATE)
+ (SELECT COUNT(*) FROM dw.orders_rejects WHERE load_date = CURRENT_DATE) AS output_rows;

Test 2: tMap lookup with inner join rejects

-- Orders whose customer is missing in dim_customer must be in the reject table
SELECT o.order_id
FROM stg.orders o
LEFT JOIN dw.dim_customer c ON c.customer_id = o.customer_id
WHERE c.customer_id IS NULL
EXCEPT
SELECT order_id FROM dw.orders_rejects;
-- Expected: 0 rows

Test 3: tUniqRow de-duplication

SELECT order_id, COUNT(*)
FROM dw.fact_orders
GROUP BY order_id
HAVING COUNT(*) > 1;
-- Expected: 0 rows

Also review each job's run statistics (rows read, rows written, rejects) after every execution, and check that context variables point to the right environment — a QA job reading production sources is a surprisingly common defect.

Talend vs Informatica for ETL Testers

Because the testing approach is the same, SQL-based ETL testing skills transfer across tools. Read our Informatica PowerCenter training guide and the ETL testing tools comparison to see how the pieces fit together.

Frequently Asked Questions

What is the best Talend training?

Official Qlik/Talend training is the most current and certification-aligned. For a budget option, combine a self-paced Talend course with an ETL testing course so you learn both how to build and how to test Talend jobs.

Is Talend certification still available after the Qlik acquisition?

Yes. Talend certifications are now offered through Qlik’s certification program. Check Qlik’s certification site for current exam names and prices.

Is Talend Open Studio still free?

Talend Open Studio was discontinued in 2024 and is no longer maintained. Older versions still exist, but new learning should target current Qlik Talend products.

Do ETL testers need to learn Talend?

Only if your target employer uses it. ETL testers need to read Talend jobs and validate their output with SQL. SQL validation skills transfer to every ETL tool.

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Written by

Asim Noaman Lodhi

Certified Google Partner · QA Consultant · 12+ Years IT

QA consultant specializing in ETL testing and data quality. Trained 913+ students to transition into data testing roles through hands-on, real-world instruction.

4.5 Rating 913+ Students Google Partner 79 Lectures