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Let’s say we have a table with an <code>id</code> and <code>name</code> fields. The table holds over 100 million rows and we want to sample a random row in the table without throttling the database.

Write a query to randomly sample a row from this table.

Input:

<code>big_table</code> table

<table>
<thead>
<tr>
<th>Columns</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>name</code></td>
<td>VARCHAR</td>
</tr>
</tbody>
</table>

Write a query to randomly sample a row from a big table.

Random SQL Sample

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

What is a key disadvantage of the F-test when compared to multiple t-tests?

What is a key disadvantage of the F-test when compared to multiple t-tests?

Hundreds of Hypotheses

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

In an A/B test, how can you check if assignment to the various buckets was truly random?

In an A/B test, which of the following is a common method to determine if the assignment to the test groups was truly random?

In an A/B test, which of the following is a common method to determine if the assignment to the test groups was truly random?

Random Bucketing

Kubra Salaries by Position

KUBRA is in growth mode and currently seeking a .NET Senior Software Engineer to work alongside our Product Engineering Team As a Senior Software Engineer, you will be responsible for design and implementation of new systems and features, as well as modification and maintenance of existing systems for adaptation to business and/or technology changes. The Senior Software Engineer engages directly with IT management, development teams and Service Delivery teams to ensure the successful design, development, and delivery of technology-based solutions. This is a hybrid opportunity based out of our office in Tempe, AZ. What you get to do every day Participate in conference calls and site meeting with the clients if needed Find solutions for converting client requirements into product implementations Participate in the full software development lifecycle Write code and contribute to the software architecture of a highly concurrent, high-throughput system Contribute to design of new functionality and expand existing functionality Collaborate with Software Engineers, Team Lead, and management on product roadmap and architecture development plans Help train and mentor other Software Engineers Manage a number of projects and tasks using a variety of technologies Document processes and track all implementation/ development activities through the DW Support Case system and KUBRA's Agile development tracking tools May travel to visit clients throughout North America to participate in design sessions and deliver technical presentations and training What kind of person should you be? Effective communication and organizational skills Team player who takes pride in their work Well-rounded agile, adaptable, and responsible individual with hands-on experience of all phases of a project - requirements, design, development, testing and deployment Strong analytical and problem solving skills Thrives in a fast-paced, delivery oriented environment with the ability to multi-task and manage multiple competing deliverables and deadlines Strong object oriented programming skills and knowledge of design patterns Extensive development experience with MS SQL Server and Cosmos DB Proficient in object oriented programming, data structures and algorithm efficiency Ability and desire to work at a very detailed level while also having the ability to understand objectives from a macro perspective. Willing to work extended hours to meet deadlines when required Passionate about building great software that exceed user expectations Ability to learn and adapt to new technologies through training, self-advancement, and collaboration with peers What skills do you need? 5 years of full stack application development experience including the design, development, testing and implementation of both web and desktop-based solutions 3 years of hands-on experience with Web Services/APIs Experience designing and implementing modern apps using the following tools: React/Redux, Typescript, C#, .Net Core, MVC, ASP.NET, SQL, JavaScript/TypeScript, HTML/CSS Working knowledge of the following technologies are considered assets: Mobile iOS/Android, Azure Cloud, Docker, Microsoft PowerBI. Leadership attributes and passion for mentoring and working with business users to deliver well-crafted solutions What can you expect from us? Award-winning culture that fosters growth, diversity and inclusion for all Paid day off for your birthday Free LinkedIn Learning subscription Bi-annual performance-based bonuses Continued education with our education reimbursement program Flexible schedules Free unlimited access to our refreshment stations (fully stocked with tea, coffee and other beverages) Two paid days for volunteer opportunities Free on-site Fitness center Access to a 'Tickets at Work' membership A free premium membership for 'Headspace'; an app geared towards mental health and wellbeing 401k Matching STACK2024 > Equal Employment Opportunity: KUBRA is committed to the principles of equal employment opportunity. We do not discriminate in hiring on the basis of sex, gender identity, sexual orientation, race, color, religion, creed, national origin, physical or mental disability, protected veteran status, or any other characteristic protected by federal, state, or local law. We will provide accommodations during the recruitment process upon request by emailing recruitment-teamkubra.com. Information received relating to accommodation will be addressed confidentially. We thank all applicants for their interest; however, only candidates under consideration will be contacted. While we value the skills and experiences listed in our job requirements, we also recognize that talent comes in many forms, and welcome applications from candidates who meet most but not all specified requirements. If you possess a strong desire to learn and grow in a dynamic work environment, apply now KUBRA is a fast-growing company that delivers customer communications solutions to some of the largest utility, insurance, and government entities across North America. KUBRA offers billing and payments, mapping, mobile apps, proactive communications, and artificial intelligence solutions for customers. With more than 1.5 billion customer interactions annually, KUBRA services reach over 40% of households in the U.S. and Canada. KUBRA is an operating subsidiary of Hearst. Our office is small enough to allow creative individuals to flourish, yet large enough to provide long-term stability. We place a tremendous amount of responsibility on our team members to be productive, focused and self-motivated. We offer a casual work environment, competitive compensation and a stellar benefits program. KUBRA does not typically provide immigration-related assistance, including employment-based work visa (e.g. H-1B) sponsorship, work permit applications and extensions, permanent residence (green card) sponsorship, LMIA applications or permanent residency nominations. Candidates must ensure they have legal authorization to work in the U.S/ Canada. All sponsorship determinations are case by case based on business need.

KUBRA is in growth mode and currently seeking a Senior Data Engineer to join our Data Analytics Team! As a Senior Data Engineer, you will be working on designing and maintaining our data Infrastructure and ETL processes under the direction of the Team Lead, or Senior Data Engineer. The best part? You will also get the opportunity to collaborate with an amazing Data Analytics team to provide BI Analysis as a secondary focus! This is a hybrid role based out of our office in Tempe, AZ. What you get to do every day <ul><ul><li>Build, monitor, and maintain ETL processes in AWS and Databricks.</li><li>Develop and optimize scalable, high-performance data architectures (e.g., data lakes, data warehouses) that support complex queries and large datasets.</li><li>Integrate data from diverse sources (APIs, databases, third-party systems) into unified formats for analysis, ensuring consistency and accuracy.</li><li>Design and implement dimensional models, including fact and dimension tables, utilizing star and snowflake schemas to optimize data retrieval and reporting in data warehouses.</li><li>Continuously optimize query performance, storage solutions, and data workflows to minimize latency and improve processing speeds.</li><li>Create and maintain detailed technical documentation for data processes, workflows, and system configurations to ensure knowledge sharing and system maintainability..</li><li>May travel to visit clients throughout North America to participate in design sessions and deliver technical presentations and training</li><li>Other duties as assigned.</li></ul></ul> What kind of person should you be? <ul><ul><li>Excellent written and verbal communication skills and an ability to maintain a high degree of professionalism in all client communications.</li><li>Ability to influence others, build relationships, manage conflicts, and handle negotiations.</li><li>Excellent organization, time management, problem-solving, and analytical skills.</li><li>Proactive mindset and ability to work independently in a fast-paced environment focused on results.</li><li>Ability to handle pressure.</li></ul></ul> What skills do you need? <ul><ul><li>Undergraduate or Masters degree in Computer Science, Statistics, or Analytics.</li><li>5-7 years of cloud experience on any of the major cloud platforms (preferably AWS).</li><li>Hands-on experience with big data technologies like Spark, Kafka, or similar tools for managing large datasets and distributed processing (preferably Databricks/Confluent).</li><li>Good knowledge of AWS stack such as S3, DMS, Glue, Lambda.</li><li>Experience working with modern data lake formats such as Apache Iceberg or Delta Lake.</li><li>Strong experience in optimizing Databricks and AWS workflows.</li><li>Proficiency in writing complex SQL queries, optimizing query performance, and managing relational databases</li><li>Should have dbt skills.</li></ul></ul> What can you expect from us? <ul><ul><li>Award-winning culture that fosters growth, diversity and inclusion for all</li><li>Paid day off for your birthday</li><li>Free LinkedIn Learning subscription</li><li>Bi-annual performance-based bonuses</li><li>Continued education with our education reimbursement program</li><li>Flexible schedules</li><li>Free unlimited access to our refreshment stations (fully stocked with tea, coffee and other beverages)</li><li>Two paid days for volunteer opportunities</li><li>Free on-site Fitness center</li><li>Access to a 'Tickets at Work' membership</li><li>A free premium membership for 'Headspace'; an app geared towards mental health and wellbeing</li><li>401k Matching</li> #STACK2024</ul>></ul> Equal Employment Opportunity: KUBRA is committed to the principles of equal employment opportunity. We do not discriminate in hiring on the basis of sex, gender identity, sexual orientation, race, color, religion, creed, national origin, physical or mental disability, protected veteran status, or any other characteristic protected by federal, state, or local law. We will provide accommodations during the recruitment process upon request by emailing recruitment-team@kubra.com. Information received relating to accommodation will be addressed confidentially. We thank all applicants for their interest; however, only candidates under consideration will be contacted. While we value the skills and experiences listed in our job requirements, we also recognize that talent comes in many forms, and welcome applications from candidates who meet most but not all specified requirements. If you possess a strong desire to learn and grow in a dynamic work environment, apply now! KUBRA is a fast-growing company that delivers customer communications solutions to some of the largest utility, insurance, and government entities across North America. KUBRA offers billing and payments, mapping, mobile apps, proactive communications, and artificial intelligence solutions for customers. With more than 1.5 billion customer interactions annually, KUBRA services reach over 40% of households in the U.S. and Canada. KUBRA is an operating subsidiary of Hearst. Our office is small enough to allow creative individuals to flourish, yet large enough to provide long-term stability. We place a tremendous amount of responsibility on our team members to be productive, focused and self-motivated. We offer a casual work environment, competitive compensation and a stellar benefits program. KUBRA does not typically provide immigration-related assistance, including employment-based work visa (e.g. H-1B) sponsorship, work permit applications and extensions, permanent residence (green card) sponsorship, LMIA applications or permanent residency nominations. Candidates must ensure they have legal authorization to work in the U.S/ Canada. All sponsorship determinations are case by case based on business need.

Here we grow again! With the increase in new clients and projects, our Product Development team is expanding, and we are looking for an accomplished and passionate Java Software Engineer to join us! As a Senior Java Software Engineer at KUBRA, you will collaborate with a group of talented technologists who are committed to excellence. Your role will involve shaping and enhancing our cutting-edge solutions, driving forward innovative projects, and contributing to the overall success of our product portfolio. You will be instrumental in designing, implementing, and maintaining high-quality software that exceeds our clients' expectations. We offer a dynamic, fast-paced environment where you can apply your expertise to solve complex technical problems, work with the latest technologies, and continuously grow your skill set. If you thrive on challenges, take pride in your work, and have a passion for technology, KUBRA is the perfect place for you to advance your career and make a significant impact. Senior Software Engineer, is the title of this position, internally. This is a hybrid opportunity in Tempe, AZ. What you get to do every day <ul><ul><li>As a Senior Java Software Engineer, you will work as part of a team of developers focused on building enterprise customer experience management software</li><li>Contribute to design of new functionality and expand existing functionality</li><li>Collaborate with Software Engineers, Team Lead, and management on product roadmap and architecture development plan</li><li>Participate in the full software development life cycle</li><li>Write code and contribute to the software architecture of a highly concurrent, high-throughput system</li><li>Help to train and mentor other Software Engineers</li><li>Manage a number of projects and tasks using a variety of technologies</li><li>Learn and become proficient with new technologies as product designs dictate. This may occasionally involve training at local and national technical training workshops.</li><li>Suggest ideas for new products and micro-services</li><li>Create/assist with architecture of new products</li><li>Write software to add features to existing software</li><li>Write highly concurrent, highly performant software</li><li>Bootstrap new software applications possibly with new architecture</li><li>Debug and resolve bugs in existing software</li><li>Write unit tests proving software fixes or features</li><li>Automated AWS resource creation/modification</li><li>May travel to visit clients throughout North America to participate in design sessions and deliver technical presentations and training</li></ul></ul> What kind of person should you be? <ul><ul><li>As a Senior Java Software Engineer, you pride yourself on your problem-solving and analytical skills</li><li>You have the ability to quickly learn unfamiliar systems & code bases</li><li>You can handle the most stressful situations calmly </li><li>You often suggest ideas for new applications that can improve operations</li><li>You're self motivated</li><li>Your ability to debug & triage complex problems is outstanding</li><li>You have the ability to assess maintainability & long-term impacts of design choices</li><li>You have mad respect for deadlines</li><li>The ability to work independently is crucial but you also know that Teamwork Makes The Dream Work</li></ul></ul> What skills do you need? <ul><ul><li>Bachelor's degree in Computer Science or Engineering, or equivalent experience</li><li>Master's degree is preferred</li><li>Minimum of 5 years of experience in Java environments</li><li>Leadership experience is preferred</li><li>Experience with Amazon AWS cloud facilities such as EC2, S3, and RDS is preferred</li><li>Strong proficiency in Java and object-oriented design, with knowledge of Spring/Spring Boot and Java EE</li><li>Experience in Java concurrency, use of relational databases, and stream processing</li><li>Experience writing JUnit tests to achieve high test coverage of Java code changes.</li><li>Experience working with Linux systems</li><li>Experience with Puppet/Chef/Terraform or similar software</li><li>Experience with Docker</li></ul></ul> What can you expect from us? <ul><ul><li>Award-winning culture that fosters growth, diversity and inclusion for all</li><li>Paid day off for your birthday</li><li>Free LinkedIn Learning subscription</li><li>Bi-annual performance-based bonuses</li><li>Continued education with our education reimbursement program</li><li>Flexible schedules</li><li>Free unlimited access to our refreshment stations (fully stocked with tea, coffee and other beverages)</li><li>Two paid days for volunteer opportunities</li><li>Free on-site Fitness center</li><li>Access to a 'Tickets at Work' membership</li><li>A free premium membership for 'Headspace'; an app geared towards mental health and wellbeing</li><li>401k Matching</li><li>#STACK2024</li></ul></ul> KUBRA is an equal opportunity employer dedicated to building an inclusive and diverse workforce. We will provide accommodations during the recruitment process upon request. Information received relating to accommodation will be addressed confidentially. We thank all applicants for their interest; however, only candidates under consideration will be contacted. While we value the skills and experiences listed in our job requirements, we also recognize that talent comes in many forms, and welcome applications from candidates who meet most but not all specified requirements. If you possess a strong desire to learn and grow in a dynamic work environment, apply now! KUBRA is a fast-growing company that delivers customer communications solutions to some of the largest utility, insurance, and government entities across North America. KUBRA offers billing and payments, mapping, mobile apps, proactive communications, and artificial intelligence solutions for customers. With more than 1.5 billion customer interactions annually, KUBRA services reach over 40% of households in the U.S. and Canada. KUBRA is an operating subsidiary of Hearst. Our office is small enough to allow creative individuals to flourish, yet large enough to provide long-term stability. We place a tremendous amount of responsibility on our team members to be productive, focused and self-motivated. We offer a casual work environment, competitive compensation and a stellar benefits program. KUBRA does not typically provide immigration-related assistance, including employment-based work visa (e.g. H-1B) sponsorship, work permit applications and extensions, permanent residence (green card) sponsorship, LMIA applications or permanent residency nominations. Candidates must ensure they have legal authorization to work in the U.S/ Canada. All sponsorship determinations are case by case based on business need.

Kubra Interview Questions

Kubra Interview Guides

Kubra Interview Questions

Kubra Salaries by Position

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