The function that will help us achieve this is a SUM() function because we want to add together all the 1 and -1 values for each date. But there are still 3 dates. We said that hired_dates and terminated_dates should be concatenated together and set the ignore_index parameter as true. Sample: I am a passionate engineer. based on 580 data points. Data engineer interview questions allow you to discuss your education and experience in data mining, data warehousing, machine learning, user interfaces and related capabilities. How can you resolve an SQL querys duplicate data points? Given a dictionary of roots and a sentence string. Following are the two main aspects that set them apart: For tech roles, Uber mostly focuses on data structures and algorithms like: In addition to these, many Uber tech roles also have managerial responsibilities. Were doing this because there may have been several employees employed on the same date. Now, we have the overview of how the number of employees changes in time and we still have the dates on which any changes to this number happen. For both phone screens and in-person interviews, you will typically have about an hour with each interviewer. Following are some examples of responsibilities assigned to data engineers at Uber: Being a tech company at its heart, Uber sets the bar very high for engineers. You are scheduled with Interview Kickstart. The next step is to find the maximum in the cumulative sum between their hire_date and termination_date and were still doing it only for the first employee. This Interview will be divided into three parts. How do you prioritize tasks while working on multiple projects? We can use a Python range() function for that. Give your interviewer a chance to comment on these trade-offs toothey might tell you not to worry about these concerns (such as memory overhead) at first. Uber is headquartered in San Francisco, but other U.S. positions may be based in Denver, Seattle, Chicago, or New York, to name a few. During phone screens, your interviewer will use CodeSignal to read your code as you type. To help prepare, check out the Khan Academy SQL Course. How can you calculate Uber Pools radius in a city? Therefore, the role of a data engineer at Uber is considered extremely lucrative.. WebAsked some basic questions and past experiences and direct onsite. Let Interview Kickstart be your guide! Uber pays its software engineers an average base salary of $140,000 - $150,000, depending on the job role and experience. Check out the Problems page for more coding problems and solutions. At the end of the day, the interview process is a dialogue between team and candidate about whether or not the opportunity is a mutually beneficial one. Now, the column with dates disappears from the output because it became an index of the table and the index is not shown to us right now. Its time to move to the next step: aggregate the list by date. Its a good idea to begin prepping for your technical interviews early in the processeven before submitting an application. Get your enrollment process started by registering for a Pre-enrollment Webinar with one of our Founders. Practice Questions to Ace Your Uber Tech Interview. First, you need to associate each employee with the name of the department. What are the assumptions of linear regression? Once youre shortlisted, youll go through a technical phone screen and on-site interviews. if uber_employees.at[0, 'termination_date'] is pd.NaT: start_date = uber_employees.at[0, 'hire_date'], max_emp_count = all_dates[all_dates['date'].between, uber_employees.at[0, 'max_emp'] = max_emp_count, earliest_date = all_dates[(all_dates['emp_count'] == max_emp_count)], earliest_date = all_dates[(all_dates['emp_count'] == max_emp_count) & (all_dates['date'].between(start_date, end_date))], earliest_date = all_dates[(all_dates['emp_count'] == max_emp_count) & (all_dates['date'].between(start_date, end_date))]['date'].min(), uber_employees.at[0, 'min_date'] = earliest_date, result = uber_employees[['id', 'max_emp', 'min_date']], https://platform.stratascratch.com/coding/2046-maximum-number-of-employees-reached?python=1. Juan Manuel works at the intersection of data science, law, and Originally published at https://www.stratascratch.com. Needless to say, this knowledge will come in handy when solving practical problems.. Thank you! Min: $129K. Build real-time streaming services and batch data pipelines to track and attribute user actions, such as taking rides, placing an order with Eats, etc. This [100, 8] is a list so we can select the first value like that. WebMeet Juan Manuel Contreras, Ph.D., a cognitive neuroscientist turned data science manager at Uber. Tell me about a time when you tried something new but failed. The idea is to first understand the data, then formulate the approach by writing a few general steps that can lead us to a solution, and finally, write the code based on the high-level approach. Weve helped over 6,000 engineers land their dream jobs at FAANG and tier-1 tech companies! And, in case these values dont match, you can return the last value received.. Lets call this new DataFrame hired_dates. You can also mention Ubers work culture and excellent employee benefits and why theyre valuable to you. Hadoop tech stack Oozie, Hive, Spark, Airflow, MapReduce, etc. You will generally be allowed to solve the interview problem in the language of your choice. Moreover, if this string is in incorrect page order, return its last number in order.input = 12345678910111213; output = 13input = 12345678; output = 8input = 12345; output = 5. Keep Your Elevator Pitch Ready. We need to turn this 100 into all numbers from 0 to 100. Given a list of 'N' number of transactions, return the minimum number of transactions required to settle the debt. Next, we can concatenate the two lists together. Answer: Uber's software engineer interview process consists of 4 rounds, including phone screen, tech screen, on-site, and an optional assessment round. We can run this code and see what the end_date variable has become and its January 1st 2016 because its the termination_date of the first employee in the table. and the United Kingdom will receive an alumnus interview. Find all unique combinations that are equal to the value of N in this given list of integers:Integers = [2,3,5]Target = 8Output = [3, 5], You will notice that this question breaks down into some identical subproblems. i like creating content and building tools for data scientists. They use a variety of tools and techniques to collect, process, and analyze data from various sources, such as GPS data from Uber's app, customer ratings and feedback, and economic data. This also gives you a chance to identify potential edge cases, such as if capitalization matters when determining whether two words are anagrams or the order of the results is significant. WebUber Data Engineer Interview Questions Some common questions for data engineers and scientists applying for Uber are: What are the assumptions of linear regression? Do you have experience with micro-services? (All information is based on research at the time of writing. Explain the functionality of Secondary NameNode. But theres still one thing to do, namely find the earliest date corresponding to this maximum number of employees. 1. But if we change these zeros to ones and check it for the second employee, then the end_date is equal to the current date and time in UTC timezone because this second employee, with index 1, has no termination_date. Uber is constantly on the lookout for good engineers after all, its a tech company, and it heavily relies on new technologies to spread its reach. Check out the article Interview Questions to Ask Your Interviewer for some interesting questions you can ask. Since you will spend the majority of your interview on the coding exercise, it makes sense to spend the most of your prep time training for it. In the final 5-10 mins, youll be given a chance to ask any questions to the interviewer. Give me Your preparation should include three key components: This looks much better and similar to the previous case, each row means that on a certain date the company loses one employee, and again, these dates may be duplicated but this is fine, well take care of it later. If you are preparing for a tech interview at Uber, this article covers several Uber interview questions, categorized by job roles and interview rounds; these will come in handy for your prep. One related to percentile and one relatedto weekly summarizing an order fact table.The weekly summary was not difficult but the expected result set was kind of tricky. This is what happens when an employee has no termination_date, but if they have one, then the end_date variable should just be equal to this termination_date, so we can say that else, and use the .at attribute again the same way as before. Return the length of the longest consecutive sequence. Your submission has been received! Thank you! Ask the interviewer about the job role. Print a function to calculate a given numbers square root up to two points precision. The company assesses your merit through a number of problems related to Python and SQL. But we can also see that this table still has quite a few columns. Prepare answers for these questions to get a sense of what you can expect at Uber interviews. Writing a few tests to help check your solution is also very valuable; this will help you to catch any regressions you might accidentally introduce as you optimize the code later. Attend our free webinar to amp up your career and get the salary you deserve. What skills do you think are most important to work at Uber? This is the result, each row in this table basically means that on this date we get one new employee. Prepare yourself with well-rounded questions about your job, the project or division you are applying for, and other information like employee diversity, inclusivity policies, etc. Build systems that offer Uber access to free traffic. You can also offer them an insight into your thought process by thinking out loud. The title of this Uber data scientist interview question is Maximum Number of Employees Reached and we are being asked to write a query that returns every employee that has ever worked for the company. Oops! Evaluate a given JavaScript and specify what it is doing. Sign up for our FREE webinar to learn more! WebApril Fools' Day or All Fools' Day is an annual custom on 1 April consisting of practical jokes and hoaxes.Jokesters often expose their actions by shouting "April Fools!" In general, when aggregating data in Pandas its a good practice to always apply the reset_index() function to the result. Jot down a production code to find all combinations of numbers in a list that sums up to 8. WebUber is hiring for a Engineering Manager II - Storage in San Francisco. Data Structure & Algorithm Classes (Live) System Design (Live) DevOps(Live) Explore More Live Courses; For Students. For now, lets move on to the third step that is concatenate the lists of dates. Here are some suggestions you want to keep in mind while preparing for your upcoming Uber software developer or tech lead interview: The following tips will help you to prepare for your Uber interview in a more streamlined manner. Your task is to count the number of lines in this file using Python. Describe an experience when you disagreed with your colleague in your former jobs. We have found that the most practical way to interview Software Engineers is to present them with real-world coding problems founded. If yes, simply replace a word with its root. The question also specifies that the output should have the employee ID, greatest number of employees that worked for the company during the employees tenure, and first date that number was reached. Well also cover some key tips to help you land your dream job at Uber. Without it, what was the first row of hired_dates would have index 0 but what was the first row of terminated_dates will also have the same index. Uber hires for software engineer, ML engineer, data engineer, technical program manager, and many more engineering positions. Therefore, during the data engineer interview, your skills in the following areas will be assessed: Big data technology Data warehousing Data modeling Complex SQL Mathematics (linear algebra and probability) Machine learning In our case, we want to see how the number of employees changed on each date given that there may have been some employees hired and some terminated. The Uber Data Engineer interview span across 10 to 12 different question topics. Senior (6+ years of experience) average base salary is $170,334 Mid-Level (2-5 years of experience) average base salary is $156,725 Uber Data Engineer Salary Compared to other Positions Base salary Total compensation Product Manager $75K $250K The most important one is Pandas which is the library for manipulating data and allows to perform various operations on tables of data, similar to SQL. For this, lets select only the emp_count and use the max() function to get the highest value. If one possesses adequate experience in relevant fields, the average salary for a mid-senior to senior position varies between $400,000 and $600,000. I like to learn and keep working on developing my expertise. One thing that may not be obvious at first and is not specified in the question is what the value of the termination_date column is for employees who still work at the company. The biggest thing to remember is to communicate with your interviewer. Tell me about a time when you had to motivate a coworker. If you were asked to start working today, what would you work on? This will also give you a chance to talk to your interviewer about what it is like to work on services at Uber that scale to millions of users around the world. Free interview details posted anonymously by Uber interview candidates. It turns out that after finding just a few simple, yet clever steps, this Uber data scientist interview question becomes easier to solve. Can you explain the workings of Ubers surge pricing algorithm? Define CLT. Something went wrong while submitting the form. Uber Data Engineer Interview Questions | Glassdoor See All Photos Uber Engaged Employer Overview 24K Reviews 187K Jobs 28K Salaries 5K Interviews 5.4K Why do software engineers use Hive in Hadoops eco-system? For engineering roles, youll usually have the technical phone screen with the engineering manager from the team you applied for. This way, you can continue comparing values at the beginning of this list to the integer youre incrementing by. If you arrive at a point where you have to choose between two different data structures, explain why you chose the one you did. How can you see MySQLs database structure? Weve covered some sample questions here that will help you get ready for your data engineer interview. However, if an external library can tackle your problem better, mention this to your interviewer. When expanded it provides a list of search options that will switch the search inputs to match the current selection. The final 5-10 minutes is for you! This function should have two lists, one representing predictions and the other indicating target values. After being founded in 2009 and launching its ride-sharing app a year later, Uber quickly started becoming an alternative to cabs and taxis. Moreover, remember to highlight your contribution in the preceding job role. Take a look:. Top tech companies receive a myriad of applications each year, and Uber is no exception. Lets assume that you are given a log file of 100GB. Then for each of them, we are given a first name, last name, an ID, which as we can see is an integer. Write a function that calculates a regression models root mean squared error. Note: M must be greater than 6. If you could be an expert at any skill, what skill would you choose? Having prepared the overview of the number of employees in time, we can now look at each employee separately and use our list to extract the necessary information for them, namely the maximum number of employees during their tenure and the date when it occurred. Tell me about yourself. And looking at the uber_employees table, we can see that this value has been saved for this first employee. Why do you think you are a good fit for this position? It should include We are being asked to output the employee ID, the corresponding highest number of employees and the date, so we can filter the table leaving only id, max_emp and min_date columns. Manager II - Storage in San Francisco program manager, and many engineering... On this date we get one new employee highlight your contribution in the processeven before submitting an.... Applied for will come in handy when solving practical problems be an at... 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But theres still one thing to do, namely find the earliest date corresponding to maximum. That sums up to two points precision helped over 6,000 engineers land their jobs... Sample questions here that will help you land your dream job at Uber engineering roles, youll through!, return the minimum number of problems related to Python and SQL roles, youll be given a to. In-Person interviews, you need to turn this 100 into all numbers from 0 100... A year later, Uber quickly started becoming an alternative to cabs and taxis position. Be concatenated together and set the ignore_index parameter as true, when aggregating data in Pandas its a good to. A number of transactions, return the last value received your dream job Uber!, return the minimum number of transactions required to settle the debt doing this because may... Job at Uber can use a Python range ( ) function to get a sense what... Pandas its a good idea to begin prepping for your technical interviews early in processeven! The Khan Academy SQL Course a cognitive neuroscientist turned data science manager at.! Points precision across 10 to 12 different question topics merit through a technical phone screen with the name the... As true motivate a coworker are most important to work at Uber knowledge will come in handy when solving problems! Practical problems duplicate data points you can expect at Uber prioritize tasks while working on multiple projects, ]. Theres still one thing to remember is to count the number of problems related to Python and SQL what can... Manager, and Uber is no exception the current selection well also cover some key to!
