Informatica Developer interview questions & mock practice
What interview questions are asked for an Informatica Developer?
An Informatica Developer interview in 2026 runs across 4 rounds — etl and sql fundamentals, informatica deep dive, performance and scenario, behavioural / project. Below are the most-asked Informatica Developer interview questions and a focused prep plan. Rehearse every answer out loud with the free timed practice below before the real one.
- Informatica PowerCenter
- ETL
- SQL
- Data Warehousing
- Transformations
- Performance Tuning
- SCD
- UNIX
Free interview practice · Informatica Developer
Practise your Informatica Developer interview now — free
Step through the 12 most-asked Informatica Developer questions one at a time, under a timer, just like the real thing. Jot your answer, then reveal what a strong answer covers. No signup needed to practise.
The Informatica Developer interview process
Informatica PowerCenter, ETL mappings, transformations and performance tuning — the data integration skills checked for ETL developer roles at Indian IT and data services firms.
1. ETL and SQL fundamentals
ETL concepts, data warehousing and strong SQL querying.
2. Informatica deep dive
Transformations, mappings, sessions, workflows and the repository.
3. Performance and scenario
Optimisation, partitioning, error handling and SCD implementation.
4. Behavioural / project
Past ETL projects, debugging approach and working with data teams.
Most-asked Informatica Developer interview questions
12 of the questions Informatica Developer candidates are asked most often in India. Practise answering each one out loud in the timed practice above.
- 1. What is the difference between a connected and an unconnected lookup transformation?
- 2. What is the difference between a router and a filter transformation?
- 3. What is the difference between an active and a passive transformation?
- 4. How do you implement a slowly changing dimension Type 2 in Informatica?
- 5. What is the difference between a mapping and a mapplet?
- 6. What is the difference between a static and a dynamic lookup cache?
- 7. How do you perform incremental loading in Informatica?
- 8. What is the difference between an aggregator and an expression transformation?
- 9. How do you tune the performance of a slow-running mapping?
- 10. What is the difference between SQL override and a source qualifier?
- 11. What is a star schema and how is it loaded using Informatica?
- 12. Describe a complex ETL mapping you built and the challenges you faced.
How to prepare for your Informatica Developer interview
Know every common transformation cold, including lookup, joiner, aggregator, router, filter and update strategy, with the difference between active and passive.
Be strong in SQL and data warehousing concepts because Informatica questions are always paired with ETL and dimensional modelling.
Practise implementing slowly changing dimensions and incremental loads, as these scenario questions appear in nearly every interview.
Understand performance tuning techniques such as pushdown optimisation, partitioning, caching and reducing the data volume early.
Prepare a detailed walkthrough of a real mapping or workflow you built, including how you handled errors and reprocessing.
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Interview prep guides
Informatica Developer interview — FAQs
What questions are asked in an Informatica Developer interview?
Common Informatica Developer interview questions include: What is the difference between a connected and an unconnected lookup transformation? What is the difference between a router and a filter transformation? What is the difference between an active and a passive transformation? How do you implement a slowly changing dimension Type 2 in Informatica? Interviews usually run across 4 rounds — ETL and SQL fundamentals, Informatica deep dive, Performance and scenario, Behavioural / project. Practise them with the free timed practice on this page.
How many rounds are in an Informatica Developer interview?
A typical Informatica Developer interview has 4 rounds: ETL and SQL fundamentals (ETL concepts, data warehousing and strong SQL querying.); Informatica deep dive (Transformations, mappings, sessions, workflows and the repository.); Performance and scenario (Optimisation, partitioning, error handling and SCD implementation.); Behavioural / project (Past ETL projects, debugging approach and working with data teams.).
How do I prepare for an Informatica Developer interview?
To prepare for an Informatica Developer interview: Know every common transformation cold, including lookup, joiner, aggregator, router, filter and update strategy, with the difference between active and passive. Be strong in SQL and data warehousing concepts because Informatica questions are always paired with ETL and dimensional modelling. Practise implementing slowly changing dimensions and incremental loads, as these scenario questions appear in nearly every interview. Then rehearse every question out loud with the timed practice on this page before the real thing.
What skills do I need for an Informatica Developer role?
Core Informatica Developer skills tested in interviews include Informatica PowerCenter, ETL, SQL, Data Warehousing, Transformations, Performance Tuning, SCD, UNIX. OnJob shows you exactly which of these skills stand between you and a 100% match on every live Informatica Developer job.
Is the Informatica Developer mock interview practice free?
Yes. The questions, the answer guidance and the timed practice on this page are free and need no signup. With a free OnJob account you can also take timed role tests and free certification tests. Personalised AI role and skill tests are part of the paid plans.
Ace your Informatica Developer interview
Rehearse every Informatica Developer question out loud on this page, then sign in to take a timed role test or a free certification in the OnJob practice hub.