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Tesco Interview Questions

A/B Testing

Algorithms

Analytics

Machine Learning

Probability

Product Metrics

Python

Statistics

Tesco Interview Guides

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?

In an A/B test, how can you check if assignment to the various buckets was truly random?

In an A/B test, which of the following is a common method to determine if the assignment to the test groups was truly random?

In an A/B test, which of the following is a common method to determine if the assignment to the test groups was truly random?

Random Bucketing

A/B Testing & Experimentation

Tesco Salaries by Position

About the role  The Analytics Capabilities team consists of the Analytics Product Managers, Data and Business Intelligence Analysts, Software Developers and Implementation Architects. The team is responsible for defining, prioritising and delivering the self-serve analytics strategy, user behavioural data tracking and optimisation capability. The Analytics Implementation squad, where this role sits, is within this team. The squad focuses on enabling more informed and faster decisions by designing new analytics implementations and re-implementations, raising the implementation coverage across core sites alongside data quality enhancements. This position will suit a Javascript Web Developer that would be interested in working on data manipulation and data engineering. Working with strings, numbers, arrays, structured object to structure, filter and javscript algorithms for best performance. Knowledge in Web standards and security is must have. You will be responsible for Whilst specific responsibilities will be dependent upon the changing needs of Tesco as a business, the following provides an overview of the role’s key responsibilities and measures: <ul><li>Coding, QA and configuration of analytics tracking code.</li><li>Implement TMS (GTM) changes. Support advance platforms implementation through TMS.</li><li>Integrate data sources via web APIs.</li><li>Follow a data quality assurance process, including implementation, measurement and user acceptance testing.</li><li>Transfer knowledge of the business processes and requirements to the development teams.</li><li>Collaboration with Product, Development, Content, Marketing teams to collect business requirements and translate into effective tracking requirements.</li><li>This role will best suit an individual who enjoys working as part of a team, is well organised, pragmatic and a lateral thinker with an inquisitive mind who is motivated to make change for the better and, most importantly, puts our customers first. </li></ul>You will need <ul><li>Advanced knowledge in Web Technologies: HTML, CSS and JavaScript – whilst you are not going to be coding a full website and its features, we are coding core tracking methods in JavaScript with proper release cycles. Array and object manipulation, JSON data handling and other advanced methodologies and concepts. Strong working knowledge of Security for webpages, privacy and cookies. Able to write clean, readable and performant code.</li><li>Considerable digital experience working on tracking implementations for Adobe and Google Analytics 4 and their respective Javascript APIs.</li><li>Technical knowledge of Adobe and Google Analytics is essential. How it works under the hood, how to implement on eCommerce platforms and how to debug and verify own work</li><li>Solid grasp of digital analytics industry, tools and working practices.</li><li>Prior experience in providing Analytics requirement for native mobile apps, able to demonstrate clear process for QA and sign-off – tools and methodologies</li><li>Experience of using analytics, data storage, data processing and business intelligence tools – SQL, BigData is a bonus.</li></ul>Personal <ul><li>Strong communication skills with people of different skills and levels.</li><li>Flexibility, ability to plan and organise, responsiveness, creativity, self-starter.</li><li>Ability to demonstrate strong written, verbal communication and presentation skills to all levels of seniority and disciplines within the organisation. </li></ul>Whats in it for you? We’re all about the little helps. That’s why we make sure our Tesco colleague benefits package takes care of you – both in and out of work. <a>Click Here</a> to find out more!  <ul> <li>Annual bonus scheme of up to 20% of base salary </li> <li>Holiday starting at 25 days plus a personal day (plus Bank holidays) </li> <li>Private medical insurance </li> <li>26 weeks maternity and adoption leave (after 1 years’ service) at full pay, followed by 13 weeks of Statutory Maternity Pay or Statutory Adoption Pay, we also offer 4 weeks fully paid paternity leave </li> <li>Free 24/7 virtual GP service, Employee Assistance Programme (EAP) for you and your family, free access to a range of experts to support your mental wellbeing </li> </ul> About Us Our vision at Tesco is to become every customer's favourite way to shop, whether they are at home or out on the move. Our core purpose is ‘Serving our customers, communities and planet a little better every day’. Serving means more than a transactional relationship with our customers. It means acting as a responsible and sustainable business for all stakeholders, for the communities we are part of and for the planet.    We are proud to have an inclusive culture at Tesco where everyone truly feels able to be themselves. At Tesco, we not only celebrate diversity, but recognise the value and opportunity it brings. We're committed to creating a workplace where differences are valued, and make sure that all colleagues are given the same opportunities. We’re proud to have been accredited Disability Confident Leader and we’re committed to providing a fully inclusive and accessible recruitment process. For further information on the accessibility support we can offer, please click here.    We’re a big business and we can offer a range of diverse full-time & part-time working patterns across our many business areas, which means that we can find something that works for you.  We work in a more blended pattern - combining office and remote working.  Our offices will continue to be where we connect, collaborate and innovate.  If you are applying internally, please speak to the Hiring Manager about how this can work for you - Everyone is welcome at Tesco.

About the role As the Data Platform Engineer in the Cyber Data Platform team, you will contribute to the development and maintenance of a robust data platform that enables users to develop advanced analytics, machine learning, and GenAI solutions to strengthen our security defences. You will collaborate closely with cross functional data teams to ensure the platform is scalable, secure, and aligned with cybersecurity goals. We know life looks a little different for each of us. That’s why at Tesco, we always welcome chats about flexible working. Some people are at the start of their careers, some want the freedom to do the things they love. Others are going through life-changing moments like becoming a carer, nearing retirement, adapting to parenthood, or something else. So, talk to us throughout your application about how we can support. You will be responsible for Data Architecture: Support the design, build and management of realtime, near realtime and batch data architectures that support threat detection, incident response and reporting through advanced analytics, machine learning and GenAI capabilities. Data Integration and Transformation: Implement and manage the automated frameworks for integrating the data from various security sources into the security data lake. Also, the data transformation frameworks to move data between the raw, trusted, and curated data layers. Coding and Documentations: Contribute to raising the quality bar of the team's codebase by producing high-quality code and documentation of data platform architecture, process and best practices. Automation and DevOps: Implement various automations and DevOps practices to streamline the deployment, configuration, and management of data platform components. Collaboration and Communication: Collaborate and communicate effectively with members of the team and actively participate in resolving issues related to data platform operations, providing support as needed. You will need Proficiency in SQL and programming languages like Python Working knowledge of ETL and ELT frameworks and orchestration tools like Airflow and dbt Experience working with cloud platforms e.g. Azure Knowledge of data lakes and data warehouses concepts and distributed systems like Kafka, Spark etc., Familiarity of Kubernetes, CI/CD and Terraform Knowledge of cybersecurity principles and practices Whats in it for you? We’re all about the little helps. That’s why we make sure our Tesco colleague benefits package takes care of you - both in and out of work.  * Annual bonus scheme of up to 20% of base salary  * Holiday starting at 25 days plus a personal day (plus Bank holidays)  * Private medical insurance 26 weeks maternity and adoption leave (after 1 years’ service) at full pay, followed by 13 weeks of Statutory Maternity Pay or Statutory Adoption Pay, we also offer 4 weeks fully paid paternity leave  * Free 24/7 virtual GP service,  * Employee Assistance Programme (EAP) for you and your family, free access to a range of experts to support your mental wellbeing About Us You might know us as a supermarket, technology company or even for our award-winning mobile network. Truth is, we’re all of those things, and much more. Our colleagues work with one goal in mind, helping to make every day a little better for our customers, colleagues and communities all over the world. No two customers are the same, neither are our colleagues. At Tesco, we champion a balance that lets you thrive both in and out of work. Spend 60% of your week collaborating with colleagues at our office locations or local sites and the rest remotely. Whether you're just kicking off your career, juggling passions, or navigating big life events, we're here to support you. We always welcome a conversation about flexible working, so talk to us throughout your application about how we can support. We're proud to be an accredited Disability Confident Leader, where everyone’s welcome. That’s why we commit to providing a fully inclusive and accessible recruitment process. If you need support with your application, <a>click here</a> for more information. And if you're interested in joining our team but don't tick every box, don't let that hold you back from applying.

Question	Topic	Difficulty	Ask Chance
Boarding Times Bias	Statistics	Medium	Very High
Hundreds of Hypotheses	Statistics	Medium	Very High
Random Bucketing	A/B Testing & Experimentation	Medium	Very High

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