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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

Suppose there exists a new airline named Jetco that flies domestically across North America. Jetco recently had a study commissioned that tested the boarding time of every airline, and it came out that Jetco had the fastest average boarding times of any airline.

What factors could have biased this result, and what would you look into?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

Boarding Times Bias

A new airline came out as the fastest average boarding times compared to other airlines.  What factors could have biased this result and what would you look into?

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?

Lands' end Salaries by Position

*This is a hybrid role with three weeks per month onsite (Mon - Thurs). Fridays are remote, and the fourth week of the month is remote. We are looking for a savvy Data Engineer to join our growing team of analytics and data science/engineering experts. You will be responsible for supporting marketing-related executive reporting, data requests, converting existing processes to open-source technologies, and playing an important role in data governance at Lands' End. In addition, as a key member of our data engineering team, you will support the team's data scientists and data analysts on data initiatives. You are self-directed and comfortable supporting the data needs of multiple teams, systems and products. In addition, you would be excited by the prospect of optimizing or even helping redesign the company's data architecture to support next generation architectures and processes. To help with your efforts, you can expect a comprehensive technology stack, very talented co-workers, an AWS-based analytics environment with a comprehensive array of online and offline data, and a data science team developing algorithms to enhance business performance and the customer experience using agile development processes. Because of its dedication and efforts, Lands' End is #19 on the NRF's list of fasting growing retailers and an Internet Retailer top 1000 company, and a great part of your future. Responsibilities <ul><li>Creating code for production and ad hoc reports, analysis, analytics, and data requests using open-source technologies </li><li>Design effective visual interfaces using BI technologies riding atop your custom data structures </li><li>Consult with business leaders using data and analysis as the foundation of your guidance and recommendations </li><li>Automate business processes </li><li>Be a key member of the data governance process at Lands' End while ensuring data quality and relevance </li><li>Assemble sometimes large, complex data sets that meet business requirements </li><li>Build analytics tools that utilize the data pipeline to provide actionable insights into customer acquisition, operational efficiency and other key business performance metrics </li><li>Create data tools for analytics and data scientist team members that assist them in building and optimizing our product into an innovative industry leader </li><li>Support the marketing efforts of ecommerce, email, catalog, merchandising, retail, and market research </li><li>Share technical knowledge and mentor other staff members within broader analytics and e-commerce communities </li></ul>Qualifications<ul><li>Experience in a Data or Reporting Engineering role and attained a BS in Computer Science or related field. Applicable graduate work is a plus. </li><li>Advanced working SQL knowledge, and experience (~ 4+ yrs) working with relational databases, complex query authoring (SQL), query debugging, as well as working familiarity with a variety of databases. Must have demonstrated experience in various joins, use of subqueries, use of join keys and where filters, and joining multiple tables. </li><li>Strong Python skills and experience (~ 2 yrs +), with PySpark experience a strong plus </li><li>Experience and skill with data visualizations and creating presentation layers with BI technologies. Experience with open source BI tools is a plus. </li><li>Strong MS Excel skills </li><li>A passion for data - understanding its sources, uses, strengths, and weaknesses. An understanding of the principles around effective data governance in a corporate environment, and a knack for data quality. </li><li>Able to set clear and comprehensive requirements, and communicate clearly in both speaking and writing </li><li>Items that would be a strong plus: Spark, Cloud experience (AWS a plus), strong Linux skills, Postgres/Netezza, experience with MS SQL Server </li><li>Experience performing root cause analysis on internal and external data and processes to answer specific business questions and identify opportunities for improvement </li><li>Strong project management and organizational skills </li></ul> Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities The contractor will not discharge or in any other manner discriminate against employees or applicants because they have inquired about, discussed, or disclosed their own pay or the pay of another employee or applicant. However, employees who have access to the compensation information of other employees or applicants as a part of their essential job functions cannot disclose the pay of other employees or applicants to individuals who do not otherwise have access to compensation information, unless the disclosure is (a) in response to a formal complaint or charge, (b) in furtherance of an investigation, proceeding, hearing, or action, including an investigation conducted by the employer, or (c) consistent with the contractor's legal duty to furnish information. 41 CFR 60-1.35(c)

*This is a hybrid role with three weeks per month onsite (Mon - Thurs). People are the heart of our company, and our doors are open to everyone. As a customer, as an employee - we are committed to creating an inspiring culture that is welcoming, safe and inclusive for all. Our strength in work and life comes from the combination of our experiences, backgrounds and talents. It's what we do as people that makes Lands' End a great place to shop and a great place to work. As a Sr. Business Intelligence Engineer, you are responsible for developing analytical solutions using enterprise reporting tools to meet business requirements. You have an expert understanding of one or more of the tools in the enterprise reporting toolset and can develop very complex dashboards and reports. You are a thought leader on the team and consistently lead and challenge others on the team to drive towards efficient and supportable solutions. You have strong verbal and written communication skills, and you use those skills to collaborate with cross-functional partners to solve issues and design enterprise solutions. Responsibilities <ul><li>Develop analytical solutions that use standards and design patterns defined by the technical team and that meet all approved requirements and design specifications.</li><li>Unit test developed analytical solutions to ensure they are meeting defined requirements for business rules and performance expectations.</li><li>Provide accurate estimates for work assigned to you, meet agreed deadlines and specifications, record accurate time and communicate to project management when any issues arise that prevent you from meeting agreed timelines or agreed specifications.</li><li>Support developed EDW/BI applications to ensure 24/7 delivery of those applications and notify stakeholders when issues arise with delivery of those applications or defined service level agreements.</li><li>Solicit help from team members when troubleshooting issues outside of your area of expertise.</li><li>Mentor junior developers and review code.</li><li>Organize project or support team meetings to discuss production issues or design considerations.</li><li>Provide accurate estimates for work assigned to you and others, meet agreed upon deadlines, record accurate time and communicate to management when timelines will not be met by you or the team.</li><li>Define standards and design patterns to be used by the technical team.</li><li>Translate a Functional Specification into a Technical Specification provided by a Business Analyst.</li><li>Perform as a thought leader on the team by leading design sessions and challenging designs of others in a respectful manner to get an optimal design.</li><li>Keep an enterprise view of the company's data by driving towards common data definitions and design and develop reusable reporting and integration assets.</li><li>Organize project, support, or cross functional team meetings to discuss production issues or design considerations.</li><li>Provide status reports of the technical team's progress on assigned work, communicate progress, and provide resource plans for the team.</li><li>Work with Business Engagement Managers and business leaders on understanding requirements, and provide estimates for EDW/BI work.</li><li>Keep abreast of the latest tools and design techniques as it relates to business intelligence tools.</li><li>Have a broad understanding of the EDW/BI technology stack and how the various integration and BI tools can be used effectively to meet business requirements.</li><li>Have a broad enterprise understanding of Lands' End systems and how those systems interact with the EDW/BI infrastructure. Participate in company architecture forums or as a technical lead in cross functional projects.</li></ul> Qualifications <ul><li>Bachelor's degree in computer science, Information Systems, Data Science, or a related field. A master's degree is a plus.</li><li>Minimum of 8 years of experience in BI development, data analytics, or a related field.</li><li>Proficient in SQL and experience with databases such as DB2, SQL Server, Oracle, or similar.</li><li>Strong experience with BI tools such as Power BI, Tableau, or similar.</li><li>Experience with ETL tools, processes, data warehousing concepts, and architecture.</li><li>Experience with cloud-based data platforms (e.g., AWS, Azure, Google Cloud).</li><li>Familiarity with programming languages such as Python or R is a plus.</li><li>Strong analytical and problem-solving skills.</li><li>Strong understanding of data/reporting governance, standards, and management principles.</li><li>Excellent communication and collaboration skills.</li><li>Ability to work independently and manage multiple projects simultaneously.</li><li>Ability to understand requirement documents and technical specifications and translate those into code.</li><li>Ability to give constructive feedback to others based on their adherence to defined coding standards and best practices, strong understanding of governance and standards.</li><li>Ability to lead cross-functional design and review sessions and provide constructive feedback to others as it relates to coding standards and industry best practices.</li></ul> Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities The contractor will not discharge or in any other manner discriminate against employees or applicants because they have inquired about, discussed, or disclosed their own pay or the pay of another employee or applicant. However, employees who have access to the compensation information of other employees or applicants as a part of their essential job functions cannot disclose the pay of other employees or applicants to individuals who do not otherwise have access to compensation information, unless the disclosure is (a) in response to a formal complaint or charge, (b) in furtherance of an investigation, proceeding, hearing, or action, including an investigation conducted by the employer, or (c) consistent with the contractor's legal duty to furnish information. 41 CFR 60-1.35(c)

Lands' end Interview Questions

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Lands' end Interview Questions

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