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A/B Testing

How would you assess the validity of the result?

Experiment Validity

Button AB Test

How would you design a two-week A/B test to determine whether a pricing increase is a good business decision

Testing Price Increase

What would you expect to happen after the new UI is applied to all users?

New UI Effect

Precisely ascertain whether the outcomes of an A/B test, executed to assess the impact of a landing page redesign, exhibit statistical significance.

Statistically Significant Test

Behavioral

Describing a data project and its challenges

Hurdles In Data Projects

Making data-driven insights actionable for those without technical expertise

Simple Explanations

What do you tell an interviewer when they ask you what your strengths and weaknesses are?

Your Strengths and Weaknesses

Data Structures & Algorithms

Find the minimum number of days required to schedule all meetings without any conflicts.

Minimum Days for Scheduling All Meetings

Machine Learning

What is the difference between Logistic and Linear Regression?

Linear vs Logistic Regression

AI & Agentic Systems

Design a query-retrieval system for an analytics platform

Design a query-retrieval system

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?

A team wants to A/B test multiple different changes through a sign-up funnel.

For example, on a page, a button is currently red and at the top of the page. They want to see if changing a button from red to blue and/or from the top of the page to the bottom of the page will increase click-through.

How would you set up this test?

Your team wants to run an AB test on the color (red or blue) and position (top/bottom of the page) of a button that links to a promotion.

How many different variants of the test should you run to see the effect that a red button has on the bottom of the page, if currently the button is blue and on the top of the page.

Your team wants to run an AB test on the color (red or blue) and position (top/bottom of the page) of a button that links to a promotion.

How many different variants of the test should you run to see the effect that a red button has on the bottom of the page, if currently the button is blue and on the top of the page.

A/B Test Variants

Tell me about a data project that didn’t go the way you expected. What did you set out to do, what surprised you, and how did you handle it?

Let’s say that you work at a B2B SAAS company that’s interested in testing the pricing of different levels of subscriptions.

Your project manager comes to you and asks you to run a two-week-long A/B test to test an increase in pricing.

How would you approach designing this test? How would you determine whether the increase in pricing is a good business decision?

Let’s say we’re testing a new UI with the goal to increase conversion rates. We test it by giving the new UI to a random subset of users.

The test variant wins by 5% on the target metric. What would you expect to happen after the new UI is applied to all users? Will the metric actually go up by ~5%, more, or less?

Note: Assume there is no novelty effect.

You are working on a Snowflake-like analytics platform that stores query history for enterprise customers. Product managers want a feature that lets users search past queries by text, filter by metadata, and retrieve the most relevant results quickly.

Design a query-retrieval system that supports the following requirements:

<ol>
<li>Users can search by keywords appearing in the SQL text, for example <code>join</code>, <code>customer_id</code>, or <code>date_trunc</code>.</li>
<li>Users can filter by <code>user_id</code>, <code>warehouse_name</code>, <code>start_time</code> and <code>end_time</code>, and <code>status</code> such as <code>SUCCESS</code>, <code>FAILED</code>, or <code>CANCELLED</code>.</li>
<li>Results should be ranked by relevance, with exact keyword matches ranked higher than partial matches.</li>
<li>The system should return the top <code>k</code> results, sorted by relevance and then by most recent execution time.</li>
<li>The system must scale to billions of query records and support low-latency search.</li>
</ol>

You are the office manager responsible for scheduling all meetings in a company. Each meeting has a start time and end time, represented as <code>[[start_1, end_1], [start_2, end_2], …]</code>.

Your goal is to find the minimum number of days needed to schedule all meetings without conflicts.

Note: If a meeting ends at the same time another starts, it does not count as a conflict: (2026-12-01 08:00, 2026-12-01 10:00),(2026-12-01 10:00, 2026-12-01 12:00) is not considered a conflict at 10:00.

<h3>Example 1</h3>

Input:

<pre tabindex="0" class="chroma"><code>meetings = [[&#34;2026-12-01 09:00&#34;, &#34;2026-12-01 17:00&#34;], 
 [&#34;2026-12-01 10:00&#34;, &#34;2026-12-01 11:00&#34;], 
 [&#34;2026-12-01 13:00&#34;, &#34;2026-12-01 14:00&#34;]]
</code></pre>

Output:

<pre tabindex="0" class="chroma"><code>def min_days(meetings) -&gt; 2
</code></pre>

Explanation:

<pre tabindex="0" class="chroma"><code>Day 1: [&#34;2026-12-01 09:00&#34;, &#34;2026-12-01 17:00&#34;]
Day 2: [&#34;2026-12-01 10:00&#34;, &#34;2026-12-01 11:00&#34;], [&#34;2026-12-01 13:00&#34;, &#34;2026-12-01 14:00&#34;]
</code></pre>

Since one of the meetings takes the entire working day (from 9 AM to 5 PM), the other needs to be rescheduled to another day; therefore, the answer is 2.

How would you convey insights and the methods you use to a non-technical audience?

When an interviewer asks a question along the lines of:

<ul>
<li>What would your current manager say about you? What constructive criticisms might he give?</li>
<li>What are your three biggest strengths and weaknesses you have identified in yourself?</li>
</ul>

How would you respond?

When asked about your strengths in an interview, what is an effective way to respond?

When asked about your strengths in an interview, what is an effective way to respond?

Your Strengths and Weaknesses I

Which of the following is an acceptable strategy when discussing weaknesses in an interview?

Which of the following is an acceptable strategy when discussing weaknesses in an interview?

Your Strengths and Weaknesses II

Let’s say we want to launch a re-design of a landing page to improve the click-through rate. We can do this by implementing an AB test.
Given that we launch an AB test, how would you infer if the results of the click-through rate were statistically significant or not?

How can you accurately conclude if the results of an A/B test, conducted to evaluate the effectiveness of a landing page redesign, are statistically significant?

How can you accurately conclude if the results of an A/B test, conducted to evaluate the effectiveness of a landing page redesign, are statistically significant?

What is the difference between Logistic and Linear Regression?

When would use one instead of the other in practice?

Challenge

<h3>Job Description</h3><div>Job Description<div><div>At Wilson Elser, we are redefining what it means to work at a national law firm. With more than 1,400 attorneys across 46 offices nationwide, we are recognized among the top 100 law firms by The American Lawyer and ranked #36 in the National Law Journal's survey of the nation's largest law firms.Our continued success is built on a culture of collaboration, innovation, client service, and mutual respect. We are committed to fostering an environment where employees are empowered to grow their careers, contribute meaningfully, and thrive professionally.</div>The PositionOur Staff Software Engineer will lead the design, development, delivery, and operational support of modern full stack applications and cloud-native platforms as part of the firm's ongoing digital transformation initiative. This role combines strong technical leadership with people management and operational excellence, requiring deep expertise in full stack software engineering, cloud architecture, DevOps, and secure software delivery practices. This role is the owner of our in-house software product architecture in partnership with the product team. The ideal candidate will have a strong technical background in Microsoft Azure, modern software development frameworks, and operational processes, along with the ability to lead high-performing engineering teams in a fast-paced, project-driven environment. This individual will collaborate closely with data engineers, DevOps engineers, cybersecurity architects, infrastructure architects, business analysts, project managers, and firm leadership to deliver scalable, secure, and innovative technology solutions that support the firm's strategic goals. This role will drive innovation, mentor engineering talent, establish engineering best practices, and help create new opportunities for teams to leverage cutting-edge technologies while ensuring enterprise systems remain secure, reliable, and highly available. Key Responsibilities<ul><li>Serve as a senior technical leader and subject matter expert for full stack application development and cloud-native engineering initiatives.</li><li>Lead architectural design and technical strategy for scalable, secure, and maintainable enterprise applications and integrations. </li><li>Establish and promote engineering standards, design patterns, and development best practices across teams. </li><li>Guide teams through technical decision-making, architecture reviews, code reviews, and solution design sessions. </li><li>Evaluate emerging technologies, frameworks, and tools to improve engineering capabilities and accelerate delivery. </li><li>Design, develop, test, and maintain modern full stack web applications, APIs, and enterprise integrations. </li><li>Build responsive and intuitive front-end applications using modern frameworks and UI technologies. </li><li>Develop scalable back-end services, APIs, microservices, and event-driven integrations. </li><li>Lead modernization efforts for legacy platforms and support cloud migration initiatives. </li><li>Optimize application performance, scalability, reliability, maintainability, and operational resilience. </li><li>Drive cloud engineering best practices utilizing Microsoft Azure and modern cloud-native technologies. </li><li>Design and implement CI/CD pipelines, deployment automation, and Infrastructure as Code (IaC) solutions using Terraform, Bicep, and related technologies. </li><li>Partner with DevOps and infrastructure teams to improve automation, deployment reliability, monitoring, and operational maturity. </li><li>Support platform engineering initiatives focused on scalability, resiliency, and developer productivity. </li><li>Contribute to containerization and orchestration initiatives using Docker and Kubernetes. </li><li>Champion secure coding practices and contribute to a robust Secure Software Development Lifecycle (SSDLC). </li><li>Lead shift-left security initiatives, including static code analysis, dependency scanning, vulnerability remediation, and code quality enforcement. </li><li>Collaborate with cybersecurity teams to identify and mitigate application and infrastructure risks. </li><li>Promote automated testing, observability, and quality engineering practices throughout the software delivery lifecycle. </li><li>Mentor and coach software engineers across the organization on architecture, coding standards, DevOps practices, and cloud technologies. </li><li>Collaborate with product managers, business analysts, project managers, and technical teams to translate business requirements into technical solutions. </li><li>Communicate complex technical concepts effectively to both technical and non-technical stakeholders. </li><li>Partner with leadership to align technical initiatives with strategic business goals and modernization efforts.</li><li>Foster a culture of innovation, continuous learning, and engineering excellence. </li></ul>Qualifications<ul><li>7+ years of experience in full stack software development. </li><li>2+ years of experience leading technical initiatives, or software delivery efforts. </li><li>Strong experience with front-end technologies such as: <ul><li>JavaScript / TypeScript </li><li>TML5 / CSS3 </li><li>React, Angular, or Vue.js </li></ul></li></ul><ul><li>Strong experience with back-end development using technologies such as: <ul><li>Node.js, .NET, Java, or Python </li><li>RESTful APIs and microservices </li></ul></li></ul><ul><li>Experience with relational and NoSQL databases such as SQL Server, PostgreSQL, MongoDB, or Cosmos DB. </li><li>Deep knowledge of Microsoft Azure cloud services, architecture patterns, and cloud security principles. </li><li>Extensive experience with Azure DevOps, including Repos, Pipelines, Test Plans, and Artifacts. </li><li>Experience with Git-based source control and CI/CD tools. </li><li>Experience working in Agile/Scrum development environments. </li><li>Ability to analyze, review, and adapt code with a security and risk-focused mindset. </li><li>Strong analytical, architectural, troubleshooting, and communication skills. </li><li>Experience developing and supporting enterprise-scale applications within large organizations. </li></ul>Preferred Qualifications<ul><li>Experience with Docker, Kubernetes, and container orchestration technologies.</li><li>Experience with DevOps, DevSecOps, platform engineering, and cloud-native operational practices. </li><li>Familiarity with automated testing frameworks and test-driven development (TDD). </li><li>Experience with observability, monitoring, logging, and performance management platforms. </li><li>Experience with Atlassian products such as Jira, Jira Service Management, and Confluence. </li><li>Experience with shift-left security tools such as Snyk and code quality platforms such as SonarQube. </li><li>Microsoft Azure certifications or other relevant cloud certifications. </li><li>Experience leading enterprise modernization or digital transformation initiatives. </li><li>Experience with chaos engineering a plus </li></ul>Education<ul><li>Bachelor of science degree (or equivalent) in Computer Science, Engineering, or relevant field (or equivalent experience).</li></ul><div><div>Wilson Elser offers a competitive salary and benefits package designed to support our attorneys both professionally and personally.A variety of factors are considered in making compensation decisions, including but not limited to experience, education, licensure and/or certifications, geographic location, market demands, other business and organizational needs, and other factors permitted by law. Final salary wages offered may be outside of this range based on other reasons and individual circumstances. This position is considered full-time and therefore qualifies for benefits including 401(k) retirement savings plan, medical, dental, vision, disability, and life insurance. Details of participation in these benefit plans will be provided if an employee receives an offer of employment. </div><div>Salary Range: </div><div>$125,000—$150,000 USD</div></div><div>Why Should You Apply? <ul><li>Benefits: Outstanding benefits package, including 401k match and generous PTO plan</li><li>Career Growth: Ample opportunities for professional development and advancement</li><li>Employee Perks: Access to corporate discount plans and other benefits</li></ul>Wilson Elser welcomes submissions of candidates for our open positions exclusively from recruitment agencies with an active, signed fee agreement who have been granted access to a position through our dedicated Recruitment Agency Portal. We are unable to consider submissions from recruitment agencies without a current (dated as of 7/1/2024) agreement in place. We appreciate your understanding. For collaboration inquiries or to establish an agreement, please contact us at talentacquisition@wilsonelser.com.Wilson Elser is committed to a collegial work environment in which all individuals are treated with respect and dignity. It is the Firm's policy that employment will be based on merit, qualifications, and competence. Further, employment decisions will be made without regard to an applicants race, color, age, sex, religion, creed, national origin, ancestry, citizenship, marital status, sexual orientation or preference, gender identity, physical or mental disability, status as a victim of domestic violence, sex offenses, or stalking, past or present service in the uniformed services or application or obligation to serve in the uniformed services, or any other characteristic protected by law. Wilson Elser endeavors to make the Wilson Elser website accessible to any and all users. You may review our Accessibility Policy here.California Residents may review our CCPA notice for applicants and employees here.#ZR</div></div></div>

Calculate Moving Average	SQL	Easy
Predict Customer Churn	Machine Learning	Medium
A/B Test Significance	Statistics	Medium
Optimize Query Performance	SQL	Hard
Feature Importance Analysis	Machine Learning	Medium
Clean Missing Data	Python	Easy
Neural Network Architecture	Deep Learning	Hard
Calculate Cohort Retention	SQL	Medium
Bayesian Probability	Statistics	Easy
Recommend Similar Products	Machine Learning	Hard

Wilson Elser Interview Questions

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Wilson Elser Interview Questions

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