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Shift4 Interview Questions

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<p>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.</p>

<p>What factors could have biased this result, and what would you look into?</p>


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

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?

<p>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.</p>

<p>How would you assess the validity of the result?</p>


Experiment Validity

<p>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.</p>

<p>Write a query to randomly sample a row from this table.</p>

<p><strong>Input:</strong></p>

<p><code>big_table</code> table</p>

<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

Shift4 Salaries by Position

<p>Shift4 (NYSE: FOUR) is boldly redefining commerce by simplifying complex payments ecosystems across the world. As the leader in commerce-enabling technology, Shift4 powers billions of transactions annually for hundreds of thousands of businesses in virtually every industry. For more information, visit www.shift4.com .

Shift4 is expanding globally and we are looking for a passionate, technically strong Software Engineer who understands technical requirements, designs solutions, collaborates with stakeholders, and has experience delivering technology services in a high velocity, dynamic, "always on" environment.

This role can be based in the following Shift4 locations: Las Vegas, NV (preferred), Tampa, FL, Morrisville, NC, or Center Valley, PA.

Relocation assistance may be available.

Responsibilities:

Translate high-level requirements to actionable tasks and deliverables.

Contribute to architecture and design for both large and small-scale systems.

Design, build, and operate distributed software services for transaction processing.

Produce high quality software that is unit tested, code reviewed, and continuously integrated.

Collaborate with Quality Assurance team in test planning and test coverage.

Collaborate with DevOps and CI/CD in operational visibility, triaging incidents, and deployment planning.

A disciplined approach to development, code review, testing, documentation, and code structure in a team environment.

Actively participate in growing and coaching fellow team members.

Understand future business goals from Product Owners and ensure architecture and system design can support those goals.

Build proof-of-concepts to validate architectural and design choices and evangelize those technical choices to other teams.

Able to understand, diagnose, and then solve deep technical and performance issues across the platform.

Provide development support to resolve any issues with technical systems and applications.

Requirements:

5+ years of experience in software engineering working with C#.

2+ years of experience working with Node.js.

Ability to communicate high-level technical information with non-technical audiences.

Bachelor’s degree in computer science or related field or experience in lieu of a degree.

Experience in developing highly scalable, performant, and critical systems, with the ability to describe designs of systems and their scalability.

Proficiency with SQL and experience working on one or more databases e.g., SQL Server, Dynamo DB, and PostgreSQL.

Familiarity with version control systems such as Git.

Strong understanding of an Agile work environment and Agile SDLC and working with Agile teams.

Ambitious and highly motivated to deliver outstanding solutions with minimal mentorship.

Strong problem-solving and debugging skills and experience in monitoring, alerting, and distributed tracing.

Real passion for collaboration and strong interpersonal and communication skills.

Preferred Skills (Experience that is a plus to have):

Hands-on experience working with AWS environments (troubleshooting, monitoring, etc.).

Experience in Test-Driven Development is a plus.

Experience working with globally distributed teams.

Experience crafting and implementing highly scalable and performant RESTful micro-services.

Domain expertise with point of sales systems, hospitality software, and/or online payments solutions would be a significant plus.

Experience with Docker, Kubernetes, and AWS technologies.

Experience with Payments or POS development.

We are an Equal Opportunity Employer and do not discriminate against any employee or applicant for employment because of race, color, sex, age, national origin, religion, sexual orientation, gender identity and/or expression, status as a veteran, and basis of disability or any other federal, state or local protected class.

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<p>Overview

Shift4 (NYSE: FOUR) is boldly redefining commerce by simplifying complex payments ecosystems across the world. As the leader in commerce-enabling technology, Shift4 powers billions of transactions annually for hundreds of thousands of businesses in virtually every industry. For more information, visit www.shift4.com.

The Senior Business Analyst III is primarily responsible for assisting Shift4 Payments implement technology solutions in a cost-effective way by determining the requirements of a project or program, and communicating them clearly to stakeholders, facilitators and partners. In this role, you will serve as a liaison between the sales, operations, and technical development teams. You will be responsible for eliciting, analyzing, validating, specifying, and managing the business needs of the stakeholders; including customers, partners and end users. As the Senior Business Analyst, you will work closely with business units, subject matter experts and technical resources to identify business needs, define projects, develop requirements, report results and manage the effort to completion.

Responsibilities

Collaborates with customers, application developers, project management and team members to understand business requirements that drive the analysis and design of quality business solutions.
Interfaces with the business areas, customers, partners, vendors, technical staff, and project teams to drive value, return on investments and innovative solutions. This includes providing alternative solutions, including vendor solution acquisitions, with maximum benefits while reducing cost (e.g. cost benefit analysis, pros/cons of solutions).
Creates and maintains project lifecycle documents/deliverables (vision/scope document, supplemental specifications, mockups/designs, flow diagrams, testing plan, and training materials).
Translates business needs into clearly defined, detailed, and documented requirements, functional designs, and system supplemental specifications for new applications.
Analyzes change requests/enhancements in existing applications.
Manages job and project requirements so that projects are completed on time, in scope, within budget, with minimal defects.
Provides assistance on defining application development project deliverables.
Obtains appropriate level of signoff as needed throughout the project lifecycle.
Assures full compliance to required standards throughout the project lifecycle.
Assists with all aspects of requirements testing (testing plan, scenarios, documentation, defect management) to ensure minimal production UAT defects as well as performing analysis of the customer impact.
Assists with testing/QA/QC and provides root cause analysis and corrective action plans.
Assists in the resolution of risks, defects and issues.
Verifies that the delivered application requirements meet the customer needs based on the specifications, ensuring minimal defects in both UAT and production.
Assists with providing project status updates to the appropriate clients and stakeholders.
Provides required business and/or subject matter expertise for both project and production related activities.
Identifies, documents, and escalates risks, defects, and issues throughout the project lifecycle.
Analyzes data to determine business problem, trends, or opportunities for process improvements.
Participates as a subject matter expert for new strategic programs or initiatives impacting current and existing systems.

Qualifications

Must be flexible and demonstrate the ability to execute on deadlines in a high-pressure environment.
Demonstrate the ability to solve problems with a sense of ownership, enthusiasm, and innovation.
High level of written/oral communication.
Experience in project management-related activities.
Experience in group and/or management presentations.
Understanding and/or experience with software/web development.
Recommended: experience with Atlassian products (Jira, Confluence), GitHub / GitLab.

Education

Bachelor of Science degree and/or relevant work experience.

Location:

This Position Is Not Remote, Only Available At Any Of The Following Shift4 Offices In a Hybrid Mode (4 Days/week In The Office, 1 Day Home Office)

Center Calley, PA
Butler, PA
Silver Spring, MD
Tampa, FL

We are an Equal Opportunity Employer and do not discriminate against any employee or applicant for employment because of race, color, sex, age, national origin, religion, sexual orientation, gender identity and/or expression, status as a veteran, and basis of disability or any other federal, state or local protected class.
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