![]() Staging layer: This layer holds data extracted from different data sources.Explain the three-layer architecture of an ETL cycle.ĭata warehouses comprise three separate areas that every ETL developer needs to understand. These are a few questions you can ask to gauge their knowledge and understanding of ETL practices. Your ETL developer needs to know their stuff when it comes to key terms and processes in the ETL space. Technical Questions for ETL Developer Interviews It helps them determine if this is the right opportunity for them, saving you time and money on a candidate who doesn’t end up being a good fit. This allows them to gain a better understanding of what is expected of them. Good ETL developers are curious and they’re also trying to discover whether your company is a good fit for them. Do you have any questions about your role or this company? It’s also important to ask what they charge, especially if you’re working with a freelancer. Understanding whether an ETL developer bills per hour, per month, or project helps you understand whether or not they fit your company’s budget for the position. You can also understand what other experience they have as a developer in different development roles. ![]() This helps you understand what your ETL development candidate specifically did in their previous role and what their capabilities are. What were your responsibilities in your previous role? What industries do you specialize in?ĭifferent industries require different techniques and approaches, so you’ll want an ETL developer who understands your niche. This is a great way to determine if someone understands your work culture and thinks they would mesh well with your company. This helps you gauge if the ETL developer has done their homework and looked into your company and understand why they want to work with you. Why are you interested in this position at our company? How do you approach collaboration? Are you a team player?ĮTL developers need to work across multiple development teams to complete projects, so it’s important that your ETL developer has a collaborative mindset and is a team player. How do you handle tight deadlines or time-sensitive tasks at work?ĮTL developers may have to work quickly to complete data transformation in a short timeframe, so ETL developers should be comfortable with working efficiently with occasionally tight deadlines. Your prospective ETL developer should be able to explain that ETL deals with transforming the data into the staging system before loading it into a warehouse, while ELT deals with loading the data into the system and transforming it within that warehouse. However, as with many other things in development, it’s not quite that easy. In a literal sense, the difference is the order of the letters, as the steps are similar. What are the differences between ETL and ELT? ![]() When you ask this question, make sure they cover one of the key steps to the ETL process that isn’t present in the acronym itself: analysis. While the acronym covers the key three steps in theory (extract, transform, load), the process is a bit more complicated than that. What are the key steps of the ETL process? Try these key questions in your ETL developer interview: 1. They’re the first step to finding a qualified, capable ETL developer. General interview questions to ask your ETL developer can give you a “big picture” sense of how knowledgeable your prospective ETL developer is. There are plenty of high-paying companies we’ve turned down because we didn’t like their product.Īn added benefit of our relationships is that we always try to negotiate exclusive discounts for our visitors. However, we do our best not to let this impact our choices. To help pay the bills, we’ll often (but not always) set up affiliate relationships with the top providers after selecting our favorites. We offer this website completely free to our visitors. ![]()
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