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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

Let’s say that your company is running a standard control and variant AB test on a feature to increase conversion rates on the landing page. The PM checks the results and finds a .04 p-value.

How would you assess the validity of the result?

Experiment Validity

Let’s say you work for a social media company that has just done a launch in a new city. Looking at weekly metrics, you see a slow decrease in the average number of comments per user from January to March in this city.

The company has been consistently growing new users in the city from January to March.

What are some reasons why the average number of comments per user would be decreasing and what metrics would you look into?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

Decreasing Comments

How would you investigate a decline in the average number of comments per user?

Diverse Lynx Salaries by Position

: Data/Business Analyst @ Charlotte , NC - Onsite (Full Time) Looking for a Data Analyst with the requisite skill set to analyze and translate data into information, information into insight into comprehensive senior management stakeholder reporting. The candidate will be able to work under tight deadlines, complete typical project business analysis, and manage project timelines. The candidate should have a minimum of 5 - 10 years of relevant experience where they have performed data analysis and reconciliation within a financial institute middle office operations group. Data profiling and Data mapping-Collect Interpret data, analyze results using analytical techniques and provide ongoing results in a comprehensive manner. Working closely with Financial Crimes Analysts and Quantitative Modelers to review business requirements and data needs. Data Flows - Review data flows design to understand and communicate impacts related to new data sourced and/or new projects. Business requirements - review and work with the business to obtain requirements. Then, determine impacts and translate into requirements to Dev teams. Business analysis - complete business analysis tasks and help manage timelines in support of various projects manage processes, improve methods and procedures. Locate and define new process improvement and automation opportunities and work with development partners to implement. Develop standards. Manage project deliverables- manage timelines for deliverables and review status with project Data Analyst in Financial Transaction/AML domain. teams. Diverse Lynx LLC is an Equal Employment Opportunity employer. All qualified applicants will receive due consideration for employment without any discrimination. All applicants will be evaluated solely on the basis of their ability, competence and their proven capability to perform the functions outlined in the corresponding role. We promote and support a diverse workforce across all levels in the company.

Join us as a Senior Principal Software Engineer on our Software Engineering, AI Products team in Round Rock, Texas to do the best work of your career and make a profound social impact. What you'll achieve As a Senior Principal Software Engineer, you'll have the chance to architect cutting-edge AI tools alongside API and web design solutions, propelling the advancement of AI throughout its lifecycle. Your role involves spearheading solution development and ensuring release readiness while collecting insights into best practices across various AI product portfolios and business sectors. Furthermore, you'll collaborate closely with your team, providing mentorship and guidance in the design and development of AI products. You will:<ul> <li>Ensure successful deployment of AI-based tools and systems that significantly improve operational efficiency or customer experience.</li> <li>Develop innovative algorithms or models that advance the state-of-the-art in AI technology.</li> <li>Integrate AI solutions into existing workflows or platforms, enabling automation and data-driven decision-making.</li> <li>Lead teams through the entire lifecycle of AI projects, from conception to deployment and maintenance.</li> <li>Contribute to open-source AI initiatives or communities, fostering collaboration and knowledge sharing within the industry.</li> <li>Design and lead the effort on automation, CI/CD processes and toolsto make our services simpler and more robust.</li> <li>Mentor team membersin design collaboration, code reviews, development tools and processes.</li> <li>Take part in the full software development life cycleincluding development, test, continuous delivery and support.</li> <li>Be an active member of an agile team, collaboratively realizing features through development, test and delivery.</li></ul>Essential Requirements<ul> <li>13+ years of software development experience.</li> <li>Excellent knowledge and application of engineering concepts along with effective problem-solving ability.</li> <li>Solid understanding of Large Language Models, Machine Learning, Deep Learning, Generative AI, Supervised learning, data science, and data engineering.</li> <li>Proficiency in .NETand Python, which are crucial for developing robust and scalable AI solutions.</li> <li>Extensive knowledge and hands-on experienceKafka, & Angular / React, JavaScript, Typescript, CSS, HTML.</li> <li>Strong proficiency in Multithreading, Caching technology like Redis, experience in SQL /NoSQL database.</li> <li>Experience implementing test-driven developmentand hands-on with JUnit cases.</li> <li>Ability to code/debug using design specifications.</li> <li>Experience with cloud platforms like Azure / AWS. Extensive knowledge of Microservices Architecture, Micro Frontendand DevOps.</li></ul> Diverse Lynx LLC is an Equal Employment Opportunity employer. All qualified applicants will receive due consideration for employment without any discrimination. All applicants will be evaluated solely on the basis of their ability, competence and their proven capability to perform the functions outlined in the corresponding role. We promote and support a diverse workforce across all levels in the company.

The candidate will be responsible for designing & building solutions for Analytics applications, analytics group. This role will cover multiple data technology stacks as well as cloud technologies. Responsibilities •Work with business owners and IT stakeholders to understand business and functional requirements to design data & integration solutions. •Develop conceptual and physical data models as well as flow diagrams illustrate current and future state data architecture. •Establish good data modelling principles and effective data quality standards. •Act as subject matter expert on all aspects of the data architecture, including Cloud adoption, data orchestration, large data processing, security & scalability. •Guide and mentor development teams on modern data engineering & design best practices •You have strong understanding of data modeling techniques and experience in designing data models for cloud data warehouses and OLTP applications. •Evangelize modern data approaches & technologies as well as Cloud architecture across the Analytics group. Required Skills •10+ years of experience building data platforms & application architectures. •Proven experience building & deploying data warehouses with Azure platform is required with AL/ML capabilities. •Azure certification is desirable. •Strong hands-on expertise in database & query performance tuning SQL queries and database best practices with PowerBI Dashboard Exp. •Full understanding of ETL IBM DataStage concepts and Data Warehousing concepts •Strong experience with modern data engineering technologies such as python, Spark, Airflow. •You have experience with Kafka and CDC tools for real-time data synchronization. •Proven experience in Data modeling using Dimension modelling & Data vault methodologies with Power BI reporting integration experience. •Strong Data Governance Tooling experience with Collibra. •Hands-on experience working with relational and NoSQL technologies (such as Oracle, Postgres, Mongo DB, etc.) •You have experience with continuous integration and collaboration tools like Azure ADO, GitHub and Confluence. •Experience in financial industry or banking is a plus Diverse Lynx LLC is an Equal Employment Opportunity employer. All qualified applicants will receive due consideration for employment without any discrimination. All applicants will be evaluated solely on the basis of their ability, competence and their proven capability to perform the functions outlined in the corresponding role. We promote and support a diverse workforce across all levels in the company.

Role: Data Engineer Location: Hybrid (Irving, TX) Type: Contract Required skills: <ul> <li> We are seeking a highly experienced Data Engineer years of experience to lead and oversee our data-driven projects.</li> <li> The ideal candidate will have extensive technical expertise in BigQuery, SQL, Cloud Dataproc, PySpark, Cloud Composer, Python, and Cloud Dataflow.</li> <li> This role requires a strategic thinker who can manage complex projects, ensuring timely delivery and alignment with business objectives.</li> </ul> Required Skills : ,Python, BigQuery, PySpark, SQL, Cloud Composer, Cloud Dataflow, Cloud Dataproc Responsibilities : <ul> <li> Work with implementation teams from concept to operations, providing deep technical subject matter expertise for successfully deploying large scale data solutions in the enterprise, using modern data analytics technologies on premise and cloud Work with data team to efficiently use Google Cloud platform to analyze data, build data models, and generate reports visualizations Integrate massive datasets from multiple data sources for data modelling Expert in creating in data pipeline using python Create and maintain machine learning and statistical models Extract, Load, Transform, clean, and validate data Writing efficient, reusable, and testable code in Python Experience in working with Google Cloud Composer and Data Procs through Python Proficient in SQL, PL SQL, BigQuery</li> <li> Good experience in Cloud SQL & GCP platform Excellent verbal and written communication skills Extensive experience with databases as well as interpretation and manipulation of related data</li> </ul> Diverse Lynx LLC is an Equal Employment Opportunity employer. All qualified applicants will receive due consideration for employment without any discrimination. All applicants will be evaluated solely on the basis of their ability, competence and their proven capability to perform the functions outlined in the corresponding role. We promote and support a diverse workforce across all levels in the company.

Business analystDiverse Lynx LLC is an Equal Employment Opportunity employer. All qualified applicants will receive due consideration for employment without any discrimination. All applicants will be evaluated solely on the basis of their ability, competence and their proven capability to perform the functions outlined in the corresponding role. We promote and support a diverse workforce across all levels in the company.

Diverse Lynx Interview Questions

Diverse Lynx Interview Guides

Diverse Lynx Interview Questions

Diverse Lynx Salaries by Position

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