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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?

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.

Write a query to randomly sample a row from this table.

Input:

<code>big_table</code> table

<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

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

Deliveroo Salaries by Position

Why Deliveroo? We're building the definitive online food company, transforming the way the world eats by making hyper-local food more convenient and accessible. We obsess about building the future of food, whilst using our network as a force for good. We're at the forefront of an industry, powered by our market-leading technology and unrivalled network to bring incredible convenience and selection to our customers.Working at Deliveroo is the perfect environment to build a definitive career, motivated by impact. Firstly, the impact that working here will have on your development, allowing you to grow faster than you might elsewhere; secondly, the impact that you can have on Deliveroo, leaving your mark as we scale; and finally, being part of something bigger, through the impact that we make together in our marketplace and communities. What you’ll be doing As a Software Engineer at Deliveroo, your individual work meaningfully contributes to achieving goals in multiple teams. While you will work with your team and lead projects, some of your work will contribute outside of your direct remit. You will report to managers and group leads and together deliver the results. This role is based in Bangalore (Hybrid working).Technical Execution: <ul><li>You will work on improving code structure and architecture, reviewing code of any size or scope produced by your team. It will also include work to maximise the efficiency of your team via leading team project planning, foreseeing dependencies and risks, and constructively partnering with other disciplines (e.g. PM, Experience)</li><li>You'll continuously strive to simplify the maintenance and operation of production systems, championing the visibility, operational readiness, and health of your team’s systems.</li></ul> Collaboration & Leadership:<ul><li>As well as leading from the front in terms of technical execution, you'll actively build relationships with other engineering teams and where possible, identify collaboration opportunities. </li><li>You'll break down large pieces of work, guide design and technical / implementation choices and influence the roadmap within your team.</li><li>You will be taking an active role in the hiring process and conducting engineering interviews. This will also extend to the current team where you will be proactively assisting in the personal growth of colleagues, encouraging efficiency in their roles.</li></ul> Expectations:We want to emphasise that we don't expect you to meet all of the below but would love you to have experience in some of these areas.<ul><li>Take pride in readable, well-designed, well-tested software</li><li>4+ years of experience building iOS applications</li><li>4+ years of experience working with Swift and/or Objective-C </li><li>3+ years of experience with iOS development tools like Xcode</li><li>3+ years of experience working in a cross-functional team</li><li>3+ years of Experience working with UIKit and AutoLayout</li></ul> Workplace & DiversityAt Deliveroo we know that people are the heart of the business and we prioritise their welfare. We offer a wide range of benefits in areas including health, family, finance, community, convenience, growth and relocation.We believe a great workplace is one that represents the world we live in and how beautifully diverse it can be. That means we have no judgement when it comes to any one of the things that make you who you are - your gender, race, sexuality, religion or a secret aversion to coriander. All you need is a passion for (most) food and a desire to be part of one of the fastest-growing startups in an incredibly exciting space.

Why Deliveroo?We're building the definitive online food company, transforming the way the world eats by making hyper-local food more convenient and accessible. We obsess about building the future of food, whilst using our network as a force for good. We're at the forefront of an industry, powered by our market-leading technology and unrivalled network to bring incredible convenience and selection to our customers.Working at Deliveroo is the perfect environment to build a definitive career, motivated by impact. Firstly, the impact that working here will have on your development, allowing you to grow faster than you might elsewhere; secondly, the impact that you can have on Deliveroo, leaving your mark as we scale; and finally, being part of something bigger, through the impact that we make together in our marketplace and communities. What you'll do?As a Staff Software Engineer at Deliveroo, your individual work contributes to achieving group-level goals and metrics. Occasionally you will lead work outside of the direct remit of your team benefitting other teams. You will report to managers and groups leads and together deliver the results. Expectations:Technical Execution:<ul><li>You will be considered an expert in at least one relevant technical area, sought out for reviews and advice by multiple teams and colleagues.</li><li>Your work will also include forecasting and managing project timelines and risks, and setting a sustainable and incremental team pace.</li><li>It means that you will define the technical solutions for important business problems and understand the context in which large company decisions are made.</li></ul>Collaboration & Leadership:<ul><li>A part of the Staff Engineer's scope is aligning non-adjacent teams and disciplines to resolve unstructured and ambiguous challenges. This extends to coaching other folks across all levels and supporting up-and-coming leaders in the team.</li><li>You will lead the technical direction of their team, and influence the strategic direction and build non-adjacent team relationships.</li><li>Staff Engineers are calibrated to lead all types of engineering interviews, to help guide the understanding of the Deliveroo bar for all lower levels which often requires contribution in other recruiting areas outside of interviewing.</li></ul> We want to emphasise that we don't expect you to meet all of the below but would love you to have experience in some of these areas.<ul><li>Pride in readable, well-designed, well-tested software</li><li>Experience writing web-based applications in any language, and an interest in learning (Go, Ruby/Rails, Python, Scala, or Rust)</li><li>Familiarity and practical experience with relational databases (PostgreSQL, MySQL)</li><li>Familiarity and practical experience with web architecture at scale (20krpm and above)</li><li>Familiarity and practical experience with "NoSQL" data backends and key-value stores (Redis, DynamoDB, ElasticSearch, Memcache)</li><li>Familiarity and practical experiencesolving logistical problems with software</li></ul> Workplace & DiversityAt Deliveroo we know that people are the heart of the business and we prioritise their welfare. We offer multiple great benefits in areas including health, family, finance, community, convenience, growth and relocation.We believe a great workplace is one that represents the world we live in and how beautifully diverse it can be. That means we have no judgement when it comes to any one of the things that make you who you are - your gender, race, sexuality, religion or a secret aversion to coriander. All you need is a passion for (most) food and a desire to be part of one of the fastest-growing startups in an exciting space.

Deliveroo Interview Questions

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Deliveroo Interview Questions

Deliveroo Salaries by Position

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