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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?

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

Vaco Salaries by Position

Unable to partner with 3rd party vendors (Corp-to-Corp/C2C) for this opportunity. We are unable to sponsor at this time. Relocation assistance is not provided. *Please note: This role is exclusively focused on Banking Deposit Data. Only candidates with relevant enterprise-level project experience will be considered. Ensure your relevant experience is detailed in your resume. * Overview: Our banking client is seeking a highly skilled and motivated IT Business Analyst/Data Analyst with specialized experience in bank deposits. This role is critical for managing, analyzing, and understanding deposit data across the bank, building a knowledge center that serves as the go-to resource for all deposit-related information. The ideal candidate will possess strong SQL skills, a substantial background in handling bank deposit data, and exemplary communication abilities to foster collaboration across business units. Key Responsibilities:<ul><li>Knowledge Center Development: Establish and maintain a central knowledge hub for all deposit data, ensuring accuracy and accessibility for stakeholders across the bank.</li><li>Interdepartmental Collaboration: Work closely with teams such as Treasury and Regulatory Reporting to address and resolve data queries and ensure alignment with business needs.</li><li>Data Analysis and Reporting: Utilize SQL to analyze deposit behaviors and patterns, providing actionable insights to guide business decisions and strategies.</li><li>Stakeholder Support: Offer direct support to business partners by providing necessary data insights for effective problem-solving, reducing the dependency on full-scale business intelligence solutions.</li></ul> Required Qualifications:<ul><li>Deposits Experience: At least 5 years of hands-on experience with banking deposit data.</li><li>SQL Proficiency: Strong ability to write SQL queries, perform joins, and conduct detailed data analysis.</li><li>Collaboration Skills: Excellent communication skills with a proven track record of effective collaboration across diverse business teams.</li><li>Technical Tools: Proficiency in Excel and familiarity with Netezza and Jira.</li></ul> Desired Skills:<ul><li>Adaptability: Openness to transitioning to a full-time position as the project evolves.</li><li>Analytical Mindset: Strong analytical capabilities with the ability to derive insights from complex data sets.</li><li>Proactive Communication: Ability to clearly articulate findings and recommendations to both technical and non-technical stakeholders.</li></ul> Work Environment: This position offers a dynamic and supportive work environment where innovation and collaboration are highly valued. Our client encourages professional growth and development, providing a platform for you to contribute significantly to business operations. This role requires availability during East Coast business hours and may offer remote, onsite, or hybrid work arrangements. Unable to partner with 3rd party vendors (Corp-to-Corp/C2C) for this opportunity. We are unable to sponsor at this time. Relocation assistance is not provided.

Business Applications Manager (ERP Manager)LOCATION: North Dallas, TXWORK SCHEDULE: HYBRID - Employees are expected to be in the office 3 days per week.JOB TYPE: Direct hireSALARY: Depending on Experience - Full package includes competitive base salary, and employee benefits. OVERVIEWVaco Dallas is seeking a skilled Business Applications Manager (ERP Manager) for a Direct hire opportunity in the North Dallas, TX area. The ERP Manager will lead the management of the Finance and Operations D365 ERP Product. In this role, you will act as a bridge between business and IT teams, ensuring that software objectives align with business goals. You will be responsible for guiding the development of ERP solutions, focusing on D365 Finance and Operations (F&O), and ensuring that these solutions enhance business efficiency and effectiveness. KEY RESPONSIBILITIES<ul><li>ERP Solution Management: Oversee the implementation and ongoing management of D365 Finance and Operations, working closely with cross-functional teams to align solutions with business needs.</li><li>Stakeholder Engagement: Act as the key liaison between business and IT teams, gathering requirements, defining system processes, and ensuring continuous communication for project success.</li><li>Business Process Optimization: Analyze and document business processes to develop software requirements that improve operational efficiency and meet business needs.</li><li>Backlog and Prioritization: Manage the product backlog, prioritize business requirements, and incorporate feedback from stakeholders to guide iterative improvements.</li><li>Agile Methodology: Lead agile ceremonies, including stand-ups, sprint reviews, and backlog refinement, ensuring clear priorities and efficient team collaboration.</li><li>Team Leadership: Mentor and develop the ERP team, supporting their professional growth and ensuring high-quality deliverables.</li><li>User Story Development: Collaborate with business and technical teams to create clear user stories and manage them through the development lifecycle.</li><li>Governance and Compliance: Ensure solution implementation follows governance best practices, and assist with system upgrades, testing, and user training.</li><li>Continuous Improvement: Drive the evolution of D365 F&O functionalities, ensuring that new features and capabilities meet the evolving needs of the business.</li></ul> REQUIRED QUALIFICATIONS<ul><li>8-10 years of experience in ERP solutions, with a focus on Finance and Operations</li><li>Bachelor's degree in Computer Science, Engineering, Business Administration, or a related field</li><li>Experience with D365 Finance and Operations in a manufacturing environment</li><li>Proven track record in managing D365 ERP projects, including requirement gathering, solution design, and implementation</li><li>Strong organizational and interpersonal skills, with the ability to manage competing priorities and collaborate across teams</li></ul> PREFERRED QUALIFICATIONS<ul><li>Product Owner certification</li><li>Familiarity with international logistics and supply chain management</li></ul> In our commitment to transparency throughout the hiring process, we provide a target annual base salary range of $120,000 - $145,000 for this position. The actual compensation offered will be determined based on factors such as (but not limited to) experience, work location, and skills. Additionally, this position is eligible for comprehensive benefits provided by the hiring employer. BH ID: 429556

Job Duties for Maintenance/Engineering Manager:<ul><li>The Maintenance/Engineering Manager will oversee the day-to-day operations of the maintenance department, including maintenance and repairs</li><li>Prepare weekly maintenance schedules and allocate staff and resources to each task.</li><li>Evaluate facilities to determine maintenance needs, and lead safety inspections.</li><li>The Maintenance/Engineering Manager will coordinate with manager all maintenance scheduling</li><li>The Maintenance/Engineering Manager will recruit, train, and supervise maintenance technicians, mechanics, and tradesmen.</li><li>Develop maintenance procedures and schedules, and ensure compliance with company policies and procedures.</li><li>The Maintenance/Engineering Manager will assist with departmental budget estimates and costs of specific repair projects.</li><li>Participate in the coordination of projects, such as renovations.</li><li>Monitor inventory of materials and equipment.</li></ul>Qualifications for Maintenance/Engineering Manager:<ul><li>Multiple years of managerial experience</li><li>A Bachelor's is highly preferred</li><li>Manufacturing industry a big plus</li></ul>

Vaco is hiring experienced Business Analysts for multiple opportunities in Cincinnati, Ohio. The Business Analyst role is fully onsite in downtown Cincinnati (45202). Thea ideal candidate will have deep, professional experience working in a waterfall environments and knowledge of the Agile process. We are looking for someone who understands the Business Requirements lifecycle with the ability to hit the ground running. Some of the key skills needed to be successful in this role include:<ul><li>At least 8-10 years of professional, IT Business Analysis experience</li><li>Comfortable with working 100% onsite in downtown Cincinnati (with in person interview)</li><li>Ability to operate and execute job responsibilities with minimal direction.</li><li>Solid waterfall experience</li><li>Comfortable with a Gap Analysis</li><li>Financial or insurance domain experience is a nice plus</li><li>Experience working on call center related projects and applications is an added bonus, but not required</li></ul> Job Description:<ul><li>Delivery of high-quality project deliverables and meeting target delivery date.</li><li>Utilizes a variety of elicitation techniques to deliver high quality project deliverables in support of project delivery.</li><li>Responsible for planning and monitoring activities related to business analysis. Performs stakeholder analysis and selects appropriate project approach and estimates business analysis effort regarding project deliverables. Requests assistance and support when needed.</li><li>Builds and maintains strong working relationships with program and project managers to ensure clear understanding of program and project goals, objectives, scope, and deliverables.</li><li>Responsible for elicitation of requirements documentation which may include supporting multiple delivery methodologies while collaborating with multiple business analysts to deliver a comprehensive package of project deliverables when delivering a semi-complex to complex project.</li><li>Confirms and communicates stakeholder needs. Collaborates with technology partners to identify solution options. Ensures solutions are well documented and understood by all project stakeholders. Ensures traceability of multiple types of requirements to business objectives, test cases and solutions.</li><li>Effectively communicates and documents project needs via deliverables such as RAP (Requirements Analysis Package) documents, user stories, diagrams, process flows, and data mapping documents. Ability to identify multiple types of requirements and documents these as needed.</li><li>Ensures clear, concise, and consumable deliverables are documented and approved by all project stakeholders.</li><li>Ensures hand-off of documentation across multiple business analysts is understood and occurs as needed. Requests assistance and support when needed.</li><li>Conveys an appropriate sense of urgency when risks and issues arise throughout the delivery of projects as related to project deliverables as well as potential need for prioritization and escalation.</li><li>Coordinates and facilitates meetings with representatives from all levels of the organization, vendors and regulatory agencies as required to support planning, validation, and final deployment processes. Seeks guidance from management as needed with expectation to develop increased independence regarding decision making.</li><li>Assists with the interpretation of requirements into feasible options, considering technical and business constraints, and communicates options to the stakeholders.</li><li>Articulates the distinction between types of requirements and delivery methodologies (waterfall, agile, and iterative).</li><li>Demonstrated experience creating and working in a team culture that is committed to collaborative cross- functional relationships and service excellence.</li><li>Leadership responsibilities include:</li><li>Mentors and coaches others in business analysis documentation techniques, standards, and best practices.</li><li>Proactively pursues self-development and improvement in delivery assurance skills on a control basis.</li><li>Works with moderate supervision and is empowered to make an established range of decisions, escalating to management when necessary and updating management on a regular basis.</li><li>Establishes and maintains positive working relationships with associates and vendors at all levels. Requests assistance and support when needed.</li><li>Establishes, fosters, and maintains working relationships with project stakeholders and other groups throughout the organization.</li><li>Acts as a change agent across the enterprise in support of best practices and where applicable, advocates PMO services.</li><li>Performs other duties as assigned by management.</li></ul><li></li>Desired Skills and ExperienceBusiness analysis, business analyst, waterfall, methodology, GAP Analysis, testing, Requirements analysis, eliciting requirements, elicitation, requirements, Visio

*** Absolutely no sponsorship - Candidate must be USC *** Job Description: Job Description We are a forward-thinking team that prioritizes our culture as we connect thousands of insurance shoppers each month to independent insurance agents across the country. Our engineering team plays a pivotal role in achieving our mission by working on a variety of technical products that directly contribute to our goal. We believe in fostering open communication and transparency and provide our team with the autonomy to drive results. We embrace change, prioritize delivering value, and demand top-notch quality in everything we do. About the Role: We are seeking a dedicated and passionate Senior Software Engineer to join our team and play a crucial role in enhancing the value and quality of our products. As a Senior Software Engineer, you will be involved in all aspects of the Software Development Life Cycle (SDLC). This includes understanding user requirements, planning the implementation of new features, writing code, maintaining tests, conducting peer code reviews, and ensuring the stability of the software that has been deployed. Key Responsibilities:<ul><li>Collaborate with cross-functional teams to gather and understand user requirements.</li><li>Plan and execute the implementation of new features and enhancements.</li><li>Write clean, maintainable, and efficient code using Java Spring Boot.</li><li>Work with PostgresSQL for database operations.</li><li>Develop and maintain front-end components using Angular or similar frameworks.</li><li>Participate in code reviews to ensure code quality and adherence to coding standards.</li><li>Maintain and optimize existing software applications.</li><li>Contribute to architectural and design discussions.</li><li>Embrace a culture of continuous learning and improvement.</li><li>Share insights and ideas for the future development of our products.</li><li>Collaborate effectively with team members and contribute to a positive and innovative team culture.</li></ul>Qualifications:<ul><li>Approximately 5 years of professional experience in software engineering.</li><li>Strong expertise in Java Spring Boot.</li><li>Proficiency in working with PostgresSQL and Hibernate.</li><li>Experience with front-end development using Angular or similar technologies.</li><li>Curious thinker with the ability to envision the future of our products.</li><li>AWS experience is a valuable asset.</li><li>Knowledge or experience in AI is a plus.</li><li>Self-starter and highly motivated to drive product excellence and personal growth.</li><li>Excellent communication and teamwork skills.</li><li>Ability to work independently and collaboratively in a remote team environment.</li></ul>

Here is what we are looking for: <ul><li>Bachelor's Degree in Computer/Software Development, Information Technology or related discipline is required. Two years of equivalent experience can substitute for every one year of education </li><li>A minimum 5 years of database engineering and design in an online analytical processing environment (OLAP) and online transaction processing environment (OLTP) in both on-premise and Azure </li><li>5 years of experience in developing code with SQL Server Integration Services (SSIS), or Azure Data Factory (ADF) to extract, transform, and load data into data warehouses </li><li>5 years of experience in developing enterprise reporting solutions with SQL Server Reporting Services (SSRS) and Power BI is required </li><li>Must have expert knowledge of SQL Server versions 2016 and above and must understand data warehouse concepts such as dimensional designs, star schemas, data modeling, historical and incremental data modeling, data quality, extract, transform and load (ETL), and Query & Reporting </li><li>Experience with Agile and Scrum development methodologies </li></ul>

Senior Machine Learning Engineer Are you an accomplished software engineer looking for a new challenge that leverages your expertise in machine learning? Imagine a role where you can make a significant impact on the future of the financial system, all while working with cutting-edge technologies and a team that values innovation and collaboration.As a Senior Machine Learning Engineer, you'll be at the forefront of building critical infrastructure that powers the open financial system. You'll work with diverse data sources, including the blockchain, to provide millions with access to cryptocurrency and protect against malicious activities. Beyond security, you'll enhance user experiences by integrating intelligence into recommendations, risk assessments, chatbots, and more, making our product both secure and user-friendly.Our ML team is part of the Platform Product Group, dedicated to creating a trusted, scalable, and compliant platform. This group builds the foundations used by multiple products and teams, ensuring a consistent and high-quality user experience.Role Review:<ul><li>Explore and apply advanced machine learning techniques, such as deep learning, large language models (LLMs), and graph neural networks, to solve diverse challenges like fraud detection, feed ranking, recommendation systems, targeting, chatbots, and blockchain mining.</li><li>Develop and deploy robust, low-maintenance machine learning solutions in a production environment.</li><li>Create onboarding codelabs, tools, and infrastructure to democratize access to machine learning resources, fostering a culture of widespread ML adoption.</li></ul>What You Bring:<ul><li>Experience with at least one ML model: LLMs, GNN, Deep Learning, Logistic Regression, Gradient Boosting trees, etc.</li><li>Proficiency in one or more areas: data mining, information retrieval, advanced statistics, natural language processing, or computer vision.</li><li>Embody core cultural values: add positive energy, communicate clearly, be curious, and be a builder.</li></ul>Additional Assets:<ul><li>PhD with 3+ years of relevant experience, or MS in Computer Science, Machine Learning, Data Mining, Statistics, or related field with 5+ years of relevant experience.</li><li>Experience with Python.</li><li>Skills in data analysis and visualization</li></ul>Pay: Depending on your location, the target annual salary for this position varies. Full-time offers include a target bonus, target equity, and benefits (medical, dental, vision, and 401(k)). Desired Skills and Experience Python, deep learning, large language models (LLMs), and graph neural networks

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