The H1 Data Engineer interview guide, interview questions, salary data, and interview experiences.

H1 Data Engineer Interview Guide

<p>Getting ready for an Data Engineer interview at H1? The H1 Data Engineer interview span across 10 to 12 different question topics. In preparing for the interview:</p>
<ul>
<li>Know what skills are necessary for H1 Data Engineer roles.</li>
<li>Gain insights into the Data Engineer interview process at H1.</li>
<li>Practice real H1 Data Engineer interview questions.</li>
</ul>
<p>Interview Query regularly analyzes interview experience data, and we've used that data to produce this guide, with sample interview questions and an overview of the H1 Data Engineer interview.</p>


Getting ready for an Data Engineer interview at H1? The H1 Data Engineer interview span across 10 to 12 different question topics. In preparing for the interview:

- Know what skills are necessary for H1 Data Engineer roles.
- Gain insights into the Data Engineer interview process at H1.
- Practice real H1 Data Engineer interview questions.

Interview Query regularly analyzes interview experience data, and we've used that data to produce this guide, with sample interview questions and an overview of the H1 Data Engineer interview.
        

Overview

H1 Data Engineer Salary

<p>We've gathered this data from parsing thousands of interview experiences sourced from members.</p>

We've gathered this data from parsing thousands of interview experiences sourced from members.

Python

Machine Learning

Product Metrics

A/B Testing

Analytics

Statistics

Probability

Algorithms

H1 Data Engineer Interview Process

<p>Given a table called <code>employees</code>, get the largest salary of any employee by department</p>

<p><strong>Example:</strong></p>

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

<p><code>employees</code> table</p>

<table>
<thead>
<tr>
<th>Column</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>department</code></td>
<td>VARCHAR</td>
</tr>

<tr>
<td><code>salary</code></td>
<td>INTEGER</td>
</tr>
</tbody>
</table>
<p><strong>Output:</strong></p>

<table>
<thead>
<tr>
<th>Column</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>department</code></td>
<td>VARCHAR</td>
</tr>

<tr>
<td><code>largest_salary</code></td>
<td>INTEGER</td>
</tr>
</tbody>
</table>


Write a query to get the largest salary of any employee by department

Largest Salary by Department

<p>You’re tasked with designing a database system for <strong>Swipe Inc.,</strong> a company that manages payments for software developers. Swipe manages a set of APIs so developers can abstract payment processes for their web service and transfer control over to Swipe’s APIs to manage payment security and finance handling (contacting credit card providers, etc.)</p>

<p>Your database system should store a collection of API keys with their attributes, as shown in the example below:</p>

<pre tabindex="0" class="chroma"><code><span class="line"><span class="cl">{
</span></span><span class="line"><span class="cl">  &#34;API_key&#34;:{
</span></span><span class="line"><span class="cl">    &#34;Transaction_list&#34;:{
</span></span><span class="line"><span class="cl">      &#34;User_ID&#34;:{
</span></span><span class="line"><span class="cl">        &#34;Name&#34;:{
</span></span><span class="line"><span class="cl">         &#34;f_name&#34;: 
</span></span><span class="line"><span class="cl">         &#34;l_name&#34;: 
</span></span><span class="line"><span class="cl">        }
</span></span><span class="line"><span class="cl">      &#34;Card_Details&#34;:{
</span></span><span class="line"><span class="cl">        &#34;Bank&#34;:
</span></span><span class="line"><span class="cl">        &#34;Card_No&#34;:
</span></span><span class="line"><span class="cl">        &#34;Expiry&#34;:
</span></span><span class="line"><span class="cl">        &#34;CV&#34;:
</span></span><span class="line"><span class="cl">      }  
</span></span><span class="line"><span class="cl">      }
</span></span><span class="line"><span class="cl">    }
</span></span><span class="line"><span class="cl">    &#34;Curr_balance&#34;:
</span></span><span class="line"><span class="cl">  }
</span></span><span class="line"><span class="cl">}
</span></span></code></pre>

<p><strong>What are the functional and non-functional requirements for this database?</strong></p>


Determine the requirements for designing a database system to store payment APIs

Swipe Payment API

<p>You’re given a dataframe of students named <code>students_df</code>:</p>

<p><code>students_df</code> table</p>

<table>
<thead>
<tr>
<th><strong>name</strong></th>
<th><strong>age</strong></th>
<th><strong>favorite_color</strong></th>
<th><strong>grade</strong></th>
</tr>
</thead>

<tbody>
<tr>
<td>Tim Voss</td>
<td>19</td>
<td>red</td>
<td>91</td>
</tr>

<tr>
<td>Nicole Johnson</td>
<td>20</td>
<td>yellow</td>
<td>95</td>
</tr>

<tr>
<td>Elsa Williams</td>
<td>21</td>
<td>green</td>
<td>82</td>
</tr>

<tr>
<td>John James</td>
<td>20</td>
<td>blue</td>
<td>75</td>
</tr>

<tr>
<td>Catherine Jones</td>
<td>23</td>
<td>green</td>
<td>93</td>
</tr>
</tbody>
</table>
<p>Write a function named <code>grades_colors</code> to select only the rows where the student’s favorite color is green or red and their grade is above 90.</p>

<p><strong>Example:</strong></p>

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

<pre tabindex="0" class="chroma"><code><span class="line"><span class="cl"><span class="kn">import</span> <span class="nn">pandas</span> <span class="k">as</span> <span class="nn">pd</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="n">students</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&#34;name&#34;</span> <span class="p">:</span> <span class="p">[</span><span class="s2">&#34;Tim Voss&#34;</span><span class="p">,</span> <span class="s2">&#34;Nicole Johnson&#34;</span><span class="p">,</span> <span class="s2">&#34;Elsa Williams&#34;</span><span class="p">,</span> <span class="s2">&#34;John James&#34;</span><span class="p">,</span> <span class="s2">&#34;Catherine Jones&#34;</span><span class="p">],</span> <span class="s2">&#34;age&#34;</span> <span class="p">:</span> <span class="p">[</span><span class="mi">19</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">21</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">23</span><span class="p">],</span> <span class="s2">&#34;favorite_color&#34;</span> <span class="p">:</span> <span class="p">[</span><span class="s2">&#34;red&#34;</span><span class="p">,</span> <span class="s2">&#34;yellow&#34;</span><span class="p">,</span> <span class="s2">&#34;green&#34;</span><span class="p">,</span> <span class="s2">&#34;blue&#34;</span><span class="p">,</span> <span class="s2">&#34;green&#34;</span><span class="p">],</span> <span class="s2">&#34;grade&#34;</span> <span class="p">:</span> <span class="p">[</span><span class="mi">91</span><span class="p">,</span> <span class="mi">95</span><span class="p">,</span> <span class="mi">82</span><span class="p">,</span> <span class="mi">75</span><span class="p">,</span> <span class="mi">93</span><span class="p">]}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="n">students_df</span> <span class="o">=</span> <span class="n">pd</span><span class="o">.</span><span class="n">DataFrame</span><span class="p">(</span><span class="n">students</span><span class="p">)</span>
</span></span></code></pre>

<p><strong>Output:</strong></p>

<pre tabindex="0" class="chroma"><code><span class="line"><span class="cl"><span class="k">def</span> <span class="nf">grades_colors</span><span class="p">(</span><span class="n">students_df</span><span class="p">)</span> <span class="o">-&gt;</span>
</span></span></code></pre>

<table>
<thead>
<tr>
<th><strong>name</strong></th>
<th><strong>age</strong></th>
<th><strong>favorite_color</strong></th>
<th><strong>grade</strong></th>
</tr>
</thead>

<tbody>
<tr>
<td>Tim Voss</td>
<td>19</td>
<td>red</td>
<td>91</td>
</tr>

<tr>
<td>Catherine Jones</td>
<td>23</td>
<td>green</td>
<td>93</td>
</tr>
</tbody>
</table>


Write a function to select only the rows where the student's favorite color is green or red and their grade is above 90.

Good Grades and Favorite Colors

H1 Data Engineer Interview Questions

<p><p>Are you an experienced, passionate pioneer in technology who wants to work in a collaborative environment? As an experienced Project Delivery Specialist- Data Engineer you will have the ability to share new ideas and collaborate on projects as a consultant without the extensive demands of travel. If so, consider an opportunity with Deloitte under our Project Delivery Talent Model. Project Delivery Model (PDM) is a talent model that is tailored specifically for long-term, onsite client service delivery.</p><br><p>Work you'll do/Responsibilities  </p><br><p>+ Design, develop, test, deploy and maintain data processing pipelines with multiple end point downstream integrations (Kafka, Webservices, File systems etc).</p><br><p>+ Conduct data profiling of data sources and develop source-to-target mapping documents as per downstream application needs.</p><br><p>+ Create functional specification documentation to include business requirements, mapping documents (source to target, data models, data dictionary etc).</p><br><p>+ Create technical documentation providing detailed description of processes, frameworks, best practices, operational support.</p><br><p>+ Collaborate across multiple client teams such as product owners, platform & infra, SORs, engineering and operations.</p><br><p>+ Develop test cases and test plans required for unit testing and integration testing. Triage defects and resolve them based on defined SLAs.Identify and escalate any issues or risks that may impact project delivery. </p><br><p>The Team </p><br><p>As a part of the US Strategy & Analytics Offering Portfolio, the AI & Data offering provides managed AI, Intelligent Automation, and Data DevOps services across the advise-implement-operate spectrum.</p><br><p>Qualifications</p><br><p>Required</p><br><p>+ Apache Kafka, Java Messaging, Java Programming, Java REST webservice, JSON, Python programming, Git, Control-M, XML, SQL</p><br><p>+ 6+ years of overall experience in software development using core Java and/or Python3</p><br><p>+ 6+ years of Java design principles, patterns, Java standard edition and restful API development</p><br><p>+ 6+ years of writing SQL/PLSQL queries</p><br><p>+ 6+ years of experience working with file formats such as JSONs & XMLs</p><br><p>+ 2+ year of experience working with message brokers such as Kafka or RabbitMQ</p><br><p>+ 6+ years of experience with code repositories(Git), build tools (using Gradle or Maven) and DevOps CI/CD tools (Gitlab or Jenkins)</p><br><p>+ 6+ years of experience working with the open-source Java ecosystem and the libraries available for common tasks</p><br><p>+ 6+ years of experience working with Agile & Scrum development experience</p><br><p>+ Strong understanding of IaaS/PaaS/SaaS</p><br><p>+ Excellent communication and interpersonal skills.</p><br><p>+ Ability to work effectively in a fast-paced, dynamic environment.</p><br><p>+ Strong problem-solving and analytical skills.</p><br><p>+ Bachelor's degree, preferably in Computer Science, Information Technology, Computer Engineering, or related IT discipline; or equivalent experience</p><br><p>+ Must live in a commutable distance to McLean, VA or willing to relocate as this is a hybrid work model and one must work at the client site in McLean 2-3 days a week as needed.</p><br><p>+ Ability to travel 10%, on average, based on the work you do and the clients and industries/sectors you serve</p><br><p>+ Limited immigration sponsorship maybe available.</p><br><p>Preferred</p><br><p>+ Analytical/ Decision Making Responsibilities</p><br><p>+ Analytical ability to manage multiple projects and prioritize tasks into manageable work products</p><br><p>+ Can operate independently or with minimum supervision</p><br><p>+ Excellent Written and Communication Skills</p><br><p>+ Ability to deliver technical demonstrations</p><br><p>Additional Requirements</p><br><p>Information for applicants with a need for accommodation: https://www2.deloitte.com/us/en/pages/careers/articles/join-deloitte-assistance-for-disabled-applicants.html </p><br><p> All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or protected veteran status, or any other legally protected basis, in accordance with applicable law.</p><p>All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or protected veteran status, or any other legally protected basis, in accordance with applicable law. </p><br></p>

The pay range is $85,500.00 - $153,900.00<p style="text-align:inherit"></p><p style="text-align:left"><span><span>Pay is based on several factors which vary based on position. These include labor markets and in some instances may include education, work experience and certifications. In addition to your pay, Target cares about and invests in you as a team member, so that you can take care of yourself and your family. Target offers eligible team members and their dependents comprehensive health benefits and programs, which may include medical, vision, dental, life insurance and more, to help you and your family take care of your whole selves.?Other benefits for eligible team members include 401(k), employee discount, short term disability, long term disability, paid sick leave, paid national holidays, and paid vacation.?Find competitive benefits from financial and education to well-being and beyond at </span><a target="_blank" href="https://corporate.target.com/careers/benefits"><span><span><span><span><span><span><span><span><span class="WNX2">https://corporate.target.com/careers/benefits</span></span></span></span></span></span></span></span></span></a><span><span>.</span></span></span></p><p style="text-align:inherit"></p><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><b>Senior Data Engineer- Roundel Data Solutions (Cyclone) </b></div></div></div></div></div></div></div></div></div></div></div></div><div><div><div></div><div>Target is an iconic brand, a Fortune 50 company and one of Americas leading retailers.</div><div><div></div><div>Target as a tech company? Absolutely. Were the behind-the-scenes powerhouse that fuels Targets passion and commitment to cutting-edge innovation. We anchor every facet of one of the worlds best-loved retailers with a strong technology framework that relies on the latest tools and technologiesand the brightest peopleto deliver incredible value to guests online and in stores. Target Technology Services is on a mission to offer the systems, tools and support that guests and team members need and deserve. Our high-performing teams balance independence with collaboration, and we pride ourselves on being versatile, agile, and creative. We drive industry-leading technologies in support of every angle of the business, and help ensure that Target operates smoothly, securely and reliably from the inside out.</div><div></div><div>The<span> </span><b>Cyclone Team</b><span> </span>is a multi-product engineering team within Roundel, Targets Digital Media Marketing. We are a core data platform team focused on the curation and optimization of data resources used by the Marketing teams at Target. The Engineers on this team are integral in the delivery and reporting of ad campaigns served to Targets guests across multiple channels including web, emails, and other social channels.As a Senior Engineer, you serve as a specialist in the engineering team that supports the product. You help develop and gain insight in the application architecture. You can distill an abstract architecture into concrete design and influence the implementation. You show expertize in applying the appropriate software engineering patterns to build robust and scalable systems. You are an expert in programming and apply your skills in developing the product. You have the skills to design and implement the architecture on your own but choose to influence your fellow engineers by proposing software designs, providing feedback on software designs and/or implementation. You show good problem-solving skills and can help the team in triaging operational issues. You leverage your expertise in eliminating repeat occurrences.</div><div></div><div><b>As an Engineer, youll take the lead as you...</b></div><ul><li>Use your technology acumen to apply and maintain knowledge of current and emerging technologies within specialized area(s) of the technology domain.</li><li> Evaluate new technologies and participates in decision-making, accounting for several factors such as viability within Targets technical environment, maintainability, and cost of ownership.</li><li>Initiate and execute research and proof-of-concept activities for new technologies.</li><li>In complex and unstructured situations, serve as an expert resource to create and improve standards and best practices to ensure high-performance, scalable, repeatable, and secure</li><li>deliverables.</li><li>Lead the design, lifecycle management, and total cost of ownership of services.</li><li>Lead and conduct code review, design review, testing, and debugging activities at the application level. Lead functional design and architecture discussions with understanding of process flows and system diagrams to enable design decisions.</li><li>Participate in routine and non-routine construction, automation, and implementation activities, ensuring successful implementation with architectural and operational requirements and best practices met.</li><li>Provide technical oversight and coach others to resolve complex and severe technical issues.</li><li>Lead disaster recovery activities and contribute to disaster recovery planning.</li><li>Embed data quality protocols throughout data acquisition, processing, storage, and operational use.</li><li>Core responsibilities of this job are described within this job description. Job duties may change at any time due to business needs.</li></ul><p></p><p><b>About you:</b></p><ul><li>4-year degree or equivalent experience</li><li> 5+ years of experience in application and data pipeline development</li><li> 5+ years of experience working with large volumes and variety of data in a production environment</li><li> 5+ years of experience working on Big Data technologies, such as Hadoop, Apache Spark, Spark Streaming, Oozie, and Hive</li><li> Proficiency in at least one of the following languages: Scala, Python, Java</li><li>Proficiency in at least one of the following monitoring tools: Kibana, Grafana</li><li>Expertise in the delivery of high-performance, scalable, repeatable, and secure deliverables with broad impact (high throughput and low latency)</li><li>Aptitude in influencing and applying high data standards, policies, and procedures</li><li>Experience writing and organizing code using multiple computer languages, including distributed programming as well as understands different frameworks and paradigms</li><li>Computer Science foundational knowledge including competencies working with design patterns, data structures, and algorithms</li><li> Strong verbal and written communication skills</li><li> Strong analytical and troubleshooting skills of the impact of own work on the team and/or stakeholders</li></ul><div></div><div><b>Desired Qualifications:</b></div><ul><li>Experience in performance tuning data pipelines and data platforms</li><li>Experience in automated testing and various testing frameworks (e.g., JUnit)</li><li>Experience integrating with REST APIs and cloud technologies (e.g., Google Cloud Platform, Amazon Web Services)</li><li>Knowledgeable of streaming solutions (e.g., Kafka)</li><li>Exposure to containerization (e.g., Docker)</li><li>Exposure to DevOps tools, processes, and culture (e.g.  Drone, Jenkins, Git)</li><li>Experience working with a source versioning tool (e.g., Git)</li><li>Exposure to Agile concepts and frameworks</li></ul></div></div><div><div><span><span>This position will operate</span><span> as a Hybrid/Flex for Your Day work arrangement based on Targets needs. A Hybrid/Flex for Your Day work arrangement means the team members core role </span></span><span><span>will need to be </span></span><span><span>performed</span></span><span><span> </span></span><span><span>both onsite at the Target HQ MN location the role is assigned to and virtually,</span></span><span><span> depending upon what your role, team and tasks require for that day. Work duties cannot be performed outside of the country of the primary work location, unless otherwise prescribed by Target. Click </span></span><a href="https://corporate.target.com/about/locations/Target-in-the-Twin-Cities" target="_blank"><u><span>here</span></u></a><span><span> if you are curious to learn more about Minnesota.</span></span><span> </span></div></div></div></div><div><div><p></p></div></div></div><div><div><div></div></div><div></div></div></div><div><div><div><div></div><div><div><div><div><div><div><div><div></div></div></div></div></div></div></div></div></div></div></div><p style="text-align:inherit"></p><p style="text-align:inherit"></p><p style="text-align:inherit"></p><p style="text-align:inherit"></p><p style="text-align:inherit"></p><p style="text-align:inherit"></p><p style="text-align:left"><b>Americans with Disabilities Act (ADA)</b></p><p style="text-align:inherit"></p><p style="text-align:left">Target will provide reasonable accommodations with the application process upon your request as required to comply with applicable laws. If you have a disability and require assistance in this application process, please visit your nearest Target store or Supply Chain Facility or reach out to Guest Services at 1-800-440-0680 for additional information.</p><p></p><p></p>

H1 Data Engineer Interview Guide

Overview

H1 Data Engineer Salary

H1 Data Engineer Interview Process

H1 Data Engineer Interview Questions

H1 Data Engineer Jobs