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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

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Power BI Data Analyst100% Remote (8AM-5PM EST Schedule)Long-Term Contract (Full-Time Hours with Benefits) We are seeking a Data Analyst to join our Fortune 50 healthcare client’s Enterprise API Catalog team to enhance system performance, user experience, and cost optimization. You will be analyzing API data for tools rationalization, crafting insightful recommendations, and driving compliance with North Star standards. You will transform complex API data into compelling, data-driven stories for stakeholders at all levels, directly influencing strategies around API governance and platform performance. KEY RESPONSIBILITIESData Analysis & Visualization:<ul><li>Analyze API metrics and their business impact, understanding what is being measured, why, and how.</li><li>Build and maintain Power BI dashboards to present data in meaningful, visually impactful ways.</li><li>Perform backend data manipulation, including ETL processes and SQL scripting.</li></ul>Storytelling & Presentation:<ul><li>Create compelling data narratives that effectively communicate findings and recommendations to technical and non-technical audiences.</li><li>Present insights to leadership, clearly connecting the data to strategic objectives.</li><li>Use storytelling techniques to ensure stakeholders understand and act on recommendations.</li></ul>Stakeholder Collaboration & Leadership:<ul><li>Independently drive conversations with stakeholders to gather requirements, clarify objectives, and influence decisions.</li><li>Proactively engage with business and technical leaders to uncover needs and align on deliverables.</li><li>Translate technical API data into actionable insights that inform decision-making.</li></ul>API Performance & Monitoring:<ul><li>Support API governance by identifying gaps, ensuring compliance, and proposing data-driven solutions.</li><li>Collaborate with architects and product teams to monitor API performance and align with enterprise standards.</li></ul>Continuous Improvement:<ul><li>Lead API rationalization initiatives to optimize costs and improve operational efficiency.</li><li>Provide actionable insights on API compliance and performance, helping leadership make informed decisions.</li></ul> QUALIFICATIONS<ul><li>5+ years of professional experience as a Power BI/Data Analyst.</li><li>Experience analyzing API metrics in enterprise environments, with the ability to clearly articulate what was measured, the purpose behind the measurements, and how the insights were applied.</li><li>Expertise in Power BI, including visualization, dashboarding, and storytelling.</li><li>Proficiency in SQL and backend data transformation (ETL).</li><li>Proven ability to independently gather requirements and drive conversations with stakeholders.</li><li>Exceptional presentation skills, presenting data narratives to leaders and executives, translating complex insights into strategic decisions.</li></ul>

We are seeking an individual to work with a Fortune 50 Broadcast Media & Entertainment leader located in New York, New York. As the Experimentation Manager, you will be directly responsible for being the experimentation leader for Advertisements. In this role, you will have the opportunity to partner with Ads, product, engineering, and other experts to shape a shared experimentation playbook to enable trustworthy personalization and visualizations for consumers. Minimum Qualifications:<ul><li>4+ years of applied experience in Ads experimentation at an eCommerce, social network, direct-to-consumer, media entertainment company or similar tech company</li><li>BA/BS in technical or quantitative discipline or significant work experience</li><li>Experience with experiment design and platforms (i.e., in house built, Optimizely, split.io, etc.)</li><li>Extensive knowledge of statistics and analytical concepts</li><li>Coding skills for analytics and data analysis (Python, R, SQL)</li><li>Experience in using data to drive product decisions and change opinions</li><li>Direct experience working with a diverse set of stakeholders</li><li>Utilize excellent communication skills to clearly distill the essence of your technical work to audiences of all levels and across multiple functional areas</li></ul> Responsibilities:<ul><li>Work with Ads, Product, Decision Science, UX and Engineering to lay out a comprehensive experimentation playbook and roadmap</li><li>Manage an experimentation platform roadmap that supports stakeholder goals and advanced the experimentation practice</li><li>Develop an end-to-end experimentation process that is deeply integrated with Ads, product, and engineering development lifecycle</li><li>Translate insights into Ads and product strategy to empower execution in a data-informed manner</li><li>Deeply understand the ecosystem, defining and analyzing metrics that evaluate the trajectory and inform the success of products</li><li>Communicate insights, vision and strategy with executive leadership and key stakeholders</li><li>Present research on statistics, experimentation, revenue impact, ads impact, user behavior, product enhancements, and metrics development/methodology of all levels of the company ensuring transparency and partnership</li><li>Foster a culture of execution excellence and analytical rigor</li></ul> What’s in it for you?<ul><li>Working for a well-known, globally leading Media Streaming organization</li><li>Exposure to high-level business professionals in a variety of departments and geographic locations</li><li>Opportunity to work and grow your career in fast-paced environment</li></ul>

Job Title: Data Analyst, Supply Chain Innovation Job Description: Our client’s team is seeking an experienced Data Analyst to identify, create, develop, and integrate innovative solutions and programs that lead to improvements in our warehousing and distribution network. The successful candidate will lead the development and execution of new logistics initiatives designed to improve overall efficiency and meet the ever-growing demand for storage of bulk inventory in our strategically located distribution centers. The ideal candidate will have strong data mining and modeling skills and should be comfortable facilitating ideas and working from concept through to execution. Key Responsibilities: <ul><li>Retrieve and analyze data using Excel, SQL, Access, and other data management systems. </li><li>Write high-quality SQL codes to retrieve and analyze data. </li><li>Monitor existing metrics, analyze data, and partner with internal teams to identify process and system improvement opportunities. </li><li>Design and implement reporting solutions to enable stakeholders to manage the business and make effective decisions. </li><li>Manage complex calendars and scheduling with diplomacy and discretion, manage domestic travel, expense report coordination and submission, and organize, execute, and assist with team activities. </li><li>Drive small to medium operational enhancement projects. </li><li>Demonstrate excellent problem-solving, task prioritization, follow-up, and customer service skills. </li></ul>Qualifications: <ul><li>Strong data mining and modeling skills. </li><li>Proficiency in Excel, SQL, Access, and other data management systems. </li><li>Excellent problem-solving, task prioritization, follow-up, and customer service skills. </li><li>Ability to manage complex calendars and scheduling. </li><li>Experience in driving operational enhancement projects. </li><li>Comfortable facilitating ideas and working from concept through to execution. </li></ul>Preferred Qualifications: <ul><li>Experience in warehousing and distribution network. </li><li>Experience in Supply Chain</li></ul>

Master Data Business AnalystIndianapolis, INContract through April 2025 w/ possibility for extension We seek a highly skilled and detail-oriented Master Data Business Analyst to join our dynamic team. The ideal candidate will bridge the needs of the credit, master data, contact, and order fulfillment with IT teams, ensuring that process changes and technical solutions align with business objectives. This role requires a deep understanding of business processes, the legal structure of trade customers, and technical systems, the ability to translate business requirements into process and technical specifications, and the ability to work closely with development teams to implement solutions.Key Responsibilities:<ul><li>Requirements Gathering: Collaborate with business stakeholders to elicit and document business and technical requirements, ensuring clarity and completeness.</li><li>Solution Design: Work closely with development teams to design and document technical solutions, including creating process l specifications, data models, and system workflows.</li><li>Stakeholder Communication: Act as a liaison between business users and IT teams, ensuring clear communication of requirements, technical constraints, and project progress.</li><li>Data Analysis: Perform data analysis to support business needs, including data mapping, data modeling, and identifying data quality issues. Identify master data inconsistencies and use financial and contractual data to determine accurate customer information.</li><li>Process Improvement: Identify opportunities for process improvements and work with both business and technical teams to implement practical solutions.</li><li>Documentation: Create and maintain comprehensive documentation, including requirements, technical specifications, process flows, and user guides.</li></ul>Qualifications:<ul><li>Education: Bachelor’s degree in Computer Science, Information Technology, Business Administration, Finance, or a related field.</li><li>Experience:</li><li>3-5 years of experience in financial data business analysis in ERP systems or similar roles.</li><li>Proven experience in gathering and translating business and technical requirements.</li><li>Experience working with core enterprise process improvement with system enhancements. </li><li>Technical Skills:</li><li>Proficiency in SAP, Salesforce.com, Google, SmartSheet.</li><li>Familiarity with lean process improvement and the focus of the Order to Cash process steps).</li><li>Experience with technical tools and platforms relevant to the industry (e.g., ERP systems, CRM systems, cloud platforms).</li><li>Business Skills:</li><li>Strong understanding of business processes and how they relate to daily operations, as well as technical solutions.</li><li>Excellent communication and stakeholder management skills.</li><li>Ability to work independently and as part of a team, with strong problem-solving abilities.</li></ul>Key Competencies:<ul><li>Strong analytical and problem-solving skills.</li><li>Excellent verbal and written communication skills.</li><li>Ability to manage multiple projects and priorities simultaneously.</li><li>Strong attention to detail and organizational skills.</li><li>Ability to work effectively in a collaborative, team-oriented environment.</li></ul> Brooksource provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, national origin, age, sex, citizenship, disability, genetic information, gender, sexual orientation, gender identity, marital status, amnesty or status as a covered veteran in accordance with applicable federal, state, and local laws.

The IT Risk Analyst will support IT Risk functions to meet the strategic goals of our IT Risk program supporting a highly dynamic, fast-paced, and diverse organization. Reporting to the Manager of IT Risk, you will help write and help enforce IT Risk policies and procedures supporting a scalable approach to risk mitigation during rapid IT service delivery. Key to success is your knowledge of minimizing risk in IT services delivery to support the growth of digital services at TSC. Essential Duties and Responsibilities (Minimum of 5% of time spent)Implement standard operating procedures in an IT Risk Management program that follows a standards-based framework.Help mature IT risk procedures that enforce company policies and standards.Conduct formal IT risk analysis and assessments to minimize risk to critical information systems and data. Work with team members across TSC to collect IT and risk materials to fulfill audit, compliance, and regulatory requests.Monitor resolutions to audit findings relating to IT, Information Security and Privacy.Assist with third party risk assessments, make risk recommendations, and communicate results to business, technology, and legal partners.Report IT risk success criteria and performance metrics for IT operational procedures.Assist with security/privacy policies and standards development.Help create and implement action plans to address risk and security issues during development, integration, and deployment of technology solutions.Assist with the oversight of IT risk and security controls within cloud environments.Assist with managing the Security Awareness Program for the company.Assist with the delivery of IT risk, security, and privacy services to the company.QualificationsExperience: 2+ years of IT Governance, Risk, and Compliance experience. Education: Bachelor’s degree in computer science or a related field from an accredited college or university. Any suitable combination of education and experience will be considered. Professional Certifications: CISSP, CISA, CRISC, CISM, SANS GIAC, or another relevant security or governance certification(s) desired. Other knowledge, skills, or abilities: <ul><li>Hands-on experience supporting IT risk management programs using NIST, FAIR, ISO or other relevant IT control frameworks</li><li>Experience with PCI, SOX, IT General Controls, change management, data privacy, CCPA, third party risk management, identity and access management, cloud security, IAAS, PAAS, SAAS</li><li>Good analytical, problem-solving, project management, and planning skills</li><li>Collaborative skills and ability to work well within a team</li><li>Ability to work with and influence peers</li><li>Ability to work in a fast-paced and deadline-oriented environment</li><li>Self-motivated with attention to detail, deadlines, and reporting</li><li>Experience with IT GRC related tools: ZenGRC, ServiceNow and OneTrust. Audit Command Language (ACL) and integration experience is preferred.</li><li>Experience in Retail, Big 4 IT Audit, Internal IT Audit, and Security Consulting is preferred.</li></ul>Working Conditions Flexible / Hybrid working conditions.

Title: Data Engineer Location: Minneapolis, MN3-Month ContractAbout the Role Brooksource is seeking a skilled Data Engineer to support our client in delivering comprehensive technology solutions within the healthcare sector. This role is ideal for candidates with a strong background in data engineering and expertise in healthcare data management, particularly for claims and member data. You’ll play a critical role in designing, building, and optimizing data processes that drive operational efficiency, compliance, and data integrity for our client’s healthcare solutions. Key Skills & Expertise:<ul><li>Extensive experience in ETL development for healthcare claims and member data.</li><li>Proficiency in data structuring, normalization, and standardization of complex datasets.</li><li>Strong capabilities in data profiling and data wrangling using Pandas, Apache Spark, and SQL.</li><li>Experience with cloud databases (e.g., AWS RDS) and data warehousing (Amazon Redshift).</li><li>Skilled in setting up data lakes using AWS S3 for scalable data storage solutions.</li><li>Knowledge of data quality management and governance frameworks, specifically for PHI/PII compliance.</li><li>Familiar with data lineage tracking, encryption strategies, and data security practices.</li><li>Expertise in serverless computing (e.g., AWS Lambda) for data automation and transformation.</li><li>Strong understanding of SQL and NoSQL databases.</li><li>Data modeling and schema design experience.</li><li>Proficient in Python for data manipulation and automation.</li><li>Knowledge of HIPAA compliance and other healthcare-specific data quality standards.</li><li>Experience working for a Health Insurance Payer</li></ul> Responsibilities:<ul><li>Data Architecture and Integration: Design and optimize the data architecture for efficient ETL processes, data governance, and compliance.</li><li>Integration: Support integration of Client's products under the broader BCBS umbrella, ensuring interoperability with other packages.</li><li>Cross-Team Coordination: Manage complex handoffs between Client and affiliated health plans, streamlining data sharing and compliance processes.</li><li>Custom Transitions: Implement and oversee custom transition processes required for integrating Client's data infrastructure with BCBS systems.</li></ul> Why Join Us? Brooksource provides opportunities to work with leading technology-driven companies on impactful projects. This role offers the chance to contribute to mission-critical healthcare data systems, helping our client deliver high-quality, compliant, and innovative solutions in the healthcare industry. Application Process If you are a Data Engineer with a passion for transforming healthcare data into actionable insights, we want to hear from you. Apply today to join a team that values innovation, quality, and operational excellence.

Data Analyst 100% Remote (8AM-5PM EST schedule)Long-Term Contract (full-time hours with benefits) OverviewWe are seeking a Data Analyst to join our Fortune 50 healthcare client’s Enterprise API Catalog team to enhance system performance, user experience, and cost optimization. You will be analyzing API data for tools rationalization, crafting insightful recommendations, and driving compliance with North Star standards. You will transform complex API data into compelling, data-driven stories for stakeholders at all levels, directly influencing strategies around API governance and platform performance. Qualifications<ul><li>Strong experience with Power BI for backend data manipulation, visualization, and storytelling.</li><li>Proficiency in SQL and backend data manipulation, including ETL processes and data transformation.</li><li>Understanding of API metrics, governance, and usage across large enterprise platforms.</li><li>Ability to translate technical API data into strategic business insights for executive leadership.</li><li>Excellent communication skills, with the ability to influence and persuade senior stakeholders.</li><li>Familiarity with data governance principles and compliance standards related to API management.</li><li>Experience working in a highly technical enterprise-level environment, collaborating with architects and product teams to strategize and present data insights.</li></ul> Key ResponsibilitiesData Analysis & Visualization:<ul><li>Analyze data from APIs to extract actionable insights for tools rationalization and cost optimization.</li><li>Develop and maintain Power BI dashboards to clearly present complex data to diverse stakeholders.</li><li>Perform backend data manipulation, ETL (Extract, Transform, Load) processes, and SQL scripting to extract, clean, and transform data for analysis and reporting.</li></ul>Storytelling & Presentation:<ul><li>Create compelling data narratives that communicate findings and recommendations effectively to technical and non-technical stakeholders.</li><li>Translate technical data into business insights to support decision-making and strategy formulation.</li><li>Lead discussions with leaders and stakeholders, ensuring clear understanding of data-driven recommendations.</li></ul>Data Management & Governance:<ul><li>Contribute to the establishment of data management and governance standards for API usage and compliance.</li><li>Identify gaps in API governance, propose strategies, and develop solutions to enhance data quality and ensure compliance with North Star standards.</li></ul>API Governance & Monitoring:<ul><li>Analyze API utilization, versioning, and governance data to track compliance and identify outliers.</li><li>Collaborate with a centralized metrics team to support platform performance and monitoring.</li><li>Work with enterprise architects and product owners to strategize and visualize API data insights.</li></ul>Continuous Improvement:<ul><li>Drive API rationalization initiatives, identifying opportunities for cost savings and operational efficiency.</li><li>Clearly communicate the implications of API non-compliance data to leadership, offering actionable insights and guiding strategic decision-making.</li></ul>

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Brooksource Interview Questions

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