One of the primary responsibilities of an a is to define the framework and procedures for the flow of data and oversee the creation, testing, and deployment of the associated software. Collaboration and teamwork are essential for an ETL developer since the developer’s workload will change depending on the system being created.
Data difficulties may be avoided if the ETL developer has a firm grasp of the various data types and how they will load into the system. The ETL developer’s job may shift to consulting or analysis after these first steps are finished. Let’s understand more about what ETL developers do.
What do ETL developers do?
‘ETL’ stands for ‘Extract, Transform, and Load. ETL developer means moving information between several data sources and a central data repository. As a result, data management falls within the purview of an ETL developer. Data is first extracted from its sources, then transformed, and finally loaded into a data warehouse as part of the ETL development process. The ETL developer is responsible for creating, developing, and maintaining all types of data used in business. The three phases of ETL are as follows:
- Extract – Information of various types (text files, raw data, web sources, etc.) is collected and processed this way. The gathered information is then saved centrally. The data stored in many locations, including the cloud and other external systems, can be consolidated using various technologies.
- Transform – The raw data is processed (organized and formatted) once extracted. The data must be modified to conform to the specifications before being used. This procedure includes normalization, deduplication, verification, and classification.
- Load – The load phase is the ETL’s last step. The data warehouse is updated with the newly converted data. Several techniques for representing data along several dimensions and making it available to all users are possible in a warehouse. The warehouse is linked to data representation tools, so information may be dragged and dropped.
Also read – Unlocking User Engagement: The Role of a UI Developer
Job description of an ETL developer
In the IT world, an ETL Developer plans out data storage systems, populates them, and oversees the process of putting massive amounts of data into data warehousing software. In addition, the ETL developer is accountable for conducting performance tests and fixing any issues that arise before the system is released to the public.
They are a common fixture on the business intelligence squad. This role complements those in the business intelligence, big data, and data science communities. The tasks listed in a typical ETL developer job description template include the following:
- Calculates space requirements for storing data
- Collects, manages, and analyzes enormous volumes of data and develops and improves solutions enabling seamless data delivery
- Implements a data warehouse utilizing a variety of data warehousing methodologies for usage by internal business units
- Responsible for leading the design of the logical data model, constructing the physical database architecture, and launching the business’s data warehouses and data warehousing initiatives
- Safeguards data integrity
- Creates, tests, and maintains sophisticated data extraction, transformation, and loading software
- It translates functional needs and mapping designs for data access, transformation, and transportation
- Creates data flow models (both logical and physical) for ETL software
Their duties are tied to coding and database administration. That’s why being good in math and analysis is essential.
Questions for Interviewing an Entry-Level ETL Developer
Consider utilizing these beginning interview questions if you’re looking to hire an ETL developer for an entry-level position with up to two years of experience, while using an applicant tracking system to efficiently manage and evaluate candidates. Here are some ETL developer interview questions:
- Which stages of the ETL process are the most important?
- What are some of the most significant distinctions between ETL and ELT?
- Why is it necessary to have a data warehouse?
- What are the various categories of facts that are used in ETL?
- In the context of ETL, what does “partitioning” refer to?
- What kinds of programs and instruments are involved in the ETL process?
- What are the examples of the most typical forms of ETL testing?
- In ETL, how does data analysis work?
- What exactly does it imply when people talk about the ETL programming having three levels?
- What are the most typical errors that occur while using ETL?
- Can you explain the ETL testing procedure from beginning to end?
- What are some of the most difficult aspects of testing ETL systems?
- What are the many forms of partitioning that may be used in ETL, and when is each one appropriate to use?
Also read – What to Know Before Becoming an RPA Developer
What’s the typical ETL Developer salary?
The yearly income for an ETL Developer in India may be anything from 3.1 to 10.3 lakhs, with 5.6 lakhs being the mean annual salary for the position. ETL Developers have submitted the 4.7k most recent salary reports, from which these salary estimates are derived.
The average ETL developer salary for an entry-level ETL developer with less than three years of experience is 4.5 Lakhs. An ETL Developer who is in the middle of their career and has between 4 and 9 years of experience makes an average annual compensation of 8.2 Lakhs. In comparison, an ETL Developer who is experienced and has between 10 and 20 years of experience earns an average annual salary of 14.6 Lakhs.
When would you require the assistance of an expert in ETL?
Your data team will include an experienced ETL professional. Operating a complicated and extensive data system is the primary justification for employing such a team. When it comes to the following, you should consider adding an expert in ETL to your team:
- Your company creates a growing amount of unstructured data in various formats
- Your company’s business plan depends on business intelligence or machine learning growth
- You want to be data-driven, and as a result, you need data representations that are smart
- Your mechanism for processing data has become obsolete
- Your existing data approaches may need better expertise
An ETL developer must have strong ETL developer skills in both technology and business fundamentals. Making the most of your data demands you to be an expert coder, manager, and businessperson, yet many developers only care about the former. An experienced ETL developer could design, build, and keep your BI interfaces and tools running smoothly.