The Grail, Inc. Research Scientist interview guide, interview questions, salary data, and interview experiences.

Grail, Inc. Research Scientist Interview Guide

Getting ready for an Research Scientist interview at Grail, Inc.? The Grail, Inc. Research Scientist interview span across 10 to 12 different question topics. In preparing for the interview:
<ul>
<li>Know what skills are necessary for Grail, Inc. Research Scientist roles.</li>
<li>Gain insights into the Research Scientist interview process at Grail, Inc..</li>
<li>Practice real Grail, Inc. Research Scientist interview questions.</li>
</ul>
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 Grail, Inc. Research Scientist interview.


Getting ready for an Research Scientist interview at Grail, Inc.? The Grail, Inc. Research Scientist interview span across 10 to 12 different question topics. In preparing for the interview:

- Know what skills are necessary for Grail, Inc. Research Scientist roles.
- Gain insights into the Research Scientist interview process at Grail, Inc..
- Practice real Grail, Inc. Research Scientist 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 Grail, Inc. Research Scientist interview.
        

Overview

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

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

Grail, Inc. Research Scientist Interview Process

There are two lists of dictionaries representing friendship beginnings and endings: <code>friends_added</code> and <code>friends_removed</code>. Each dictionary contains the <code>user_ids</code> and <code>created_at</code> time of the friendship beginning /ending.

Write a function <code>friendship_timeline</code> to generate an output that lists the pairs of friends with their corresponding timestamps of the friendship beginning and then the timestamp of the friendship ending.

Note: There can be multiple instances over time when two people became friends and unfriended; only output lists when a corresponding friendship was removed.

Example:

Input:

<pre tabindex="0" class="chroma"><code>friends_added = [
 {&#39;user_ids&#39;: [1, 2], &#39;created_at&#39;: &#39;2020-01-01&#39;},
 {&#39;user_ids&#39;: [3, 2], &#39;created_at&#39;: &#39;2020-01-02&#39;},
 {&#39;user_ids&#39;: [2, 1], &#39;created_at&#39;: &#39;2020-02-02&#39;},
 {&#39;user_ids&#39;: [4, 1], &#39;created_at&#39;: &#39;2020-02-02&#39;}]

friends_removed = [
 {&#39;user_ids&#39;: [2, 1], &#39;created_at&#39;: &#39;2020-01-03&#39;},
 {&#39;user_ids&#39;: [2, 3], &#39;created_at&#39;: &#39;2020-01-05&#39;},
 {&#39;user_ids&#39;: [1, 2], &#39;created_at&#39;: &#39;2020-02-05&#39;}]
</code></pre>

Output:

<pre tabindex="0" class="chroma"><code>friendships = [{
 &#39;user_ids&#39;: [1, 2],
 &#39;start_date&#39;: &#39;2020-01-01&#39;,
 &#39;end_date&#39;: &#39;2020-01-03&#39;
 },
 {
 &#39;user_ids&#39;: [1, 2],
 &#39;start_date&#39;: &#39;2020-02-02&#39;,
 &#39;end_date&#39;: &#39;2020-02-05&#39;
 },
 {
 &#39;user_ids&#39;: [2, 3],
 &#39;start_date&#39;: &#39;2020-01-02&#39;,
 &#39;end_date&#39;: &#39;2020-01-05&#39;
 },
]
</code></pre>

Write a function friendship_timeline to generate an output that lists the pairs of friends with their corresponding timestamps of the friendship beginning and then the timestamp of the friendship ending. 

Friendship Timeline

Python & General Programming

The probability that it will rain tomorrow is dependent on whether or not it is raining today and whether or not it rained yesterday.

If it rained yesterday and today, there is a 20% chance it will rain tomorrow. If it rained one of the days, there is a 60% chance it will rain tomorrow. If it rained neither today nor yesterday, there is a 20% chance it will rain tomorrow.

Given that it is raining today and that it rained yesterday, write a function <code>rain_days</code> to calculate the probability that it will rain on the nth day after today.

Example:

Input:

<pre tabindex="0" class="chroma"><code>n=5
</code></pre>

Output:

<pre tabindex="0" class="chroma"><code>def rain_days(n) -&gt; 0.39968
</code></pre>

Given that it is raining today and that it rained yesterday, write a function to calculate the probability that it will rain on the nth day after today.

Rain in N Days

Probability

Design a database schema for a blogging platform. The schema should include tables for users, posts, comments, and tags. Describe the relationships between the tables, as well as any constraints you would apply.

Design a database schema for a blogging platform.

Blogging Platform Schema

Data Modeling

Grail, Inc. Research Scientist Interview Questions

Our mission is to detect cancer early, when it can be cured. We are working to change the trajectory of cancer mortality and bring stakeholders together to adopt innovative, safe, and effective technologies that can transform cancer care.
We are a healthcare company, pioneering new technologies to advance early cancer detection. We have built a multi-disciplinary organization of scientists, engineers, and physicians and we are using the power of next-generation sequencing (NGS), population-scale clinical studies, and state-of-the-art computer science and data science to overcome one of medicine’s greatest challenges.
GRAIL is headquartered in Menlo Park, California, with locations in Washington, D.C., North Carolina, and the United Kingdom. It is supported by leading global investors and pharmaceutical, technology, and healthcare companies.
For more information, please visit grail.com .
GRAIL processes patient blood samples in factory-like laboratories to detect cancer. Engineering teams are tasked with building software and hardware to automate, analyse and streamline many processes in the lab. Additionally, Operations need metrics and insights into how things are running so that they can be improved. The data for some of these metrics have historically been built by Analysts within Operations. These are now moving under Software Engineering and we are building a team to support, stabilize and enhance these pipelines
We will hire candidates for this hybrid role in either Menlo Park, CA or Durham, NC.
Responsibilities
Be a part of a highly collaborative team focused on delivering value to cross-functional partners by designing, deploying, and automating secure, efficient, and scalable data infrastructure and tools—reducing manual efforts and streamlining operations.

Help model Grail data to ensure it follows FAIR principles (Findable, Accessible, Interoperable, and Reusable).

Drive the design, deployment, and automated delivery of data infrastructure, standardized data models, datasets, and tools.

Integrate automated testing and release processes to improve the quality and velocity of software and data deliveries.

Collaborate with cross-functional teams—ranging from Research to Clinical Lab Operations to Software Engineering—to provide comprehensive data solutions from conception to delivery.

Ensure all software and data meet high standards for quality, clinical compliance, and privacy.

Mentor fellow engineers and scientists, promoting best practices in software and data engineering.

Preferred Qualifications
B.S. / M.S. in a quantitative field (e.g., Computer Science, Engineering, Mathematics, Physics, Computational Biology) with 8+ years of related industry experience, or Ph.D. with at least 5 years of related industry experience or equivalent.

Extensive experience developing with relational databases, data modeling principles, data pipeline tools, and workflow engines (e.g., SQL, DBT, Apache Airflow, AWS Glue, Spark).

Extensive experience with DevOps practices, including CI/CD pipelines, containerized deployment (e.g., Kubernetes), and infrastructure-as-code (e.g., Terraform).

Experience supporting data science and machine learning data pipelines, preferably in the context of biological data analysis and using Python.

Ability to embrace uncertainty, navigate ambiguity, and collaborate with product teams and stakeholders to refine requirements and drive toward clear engineering objectives and designs.

You are a strong written and verbal communicator and can adapt your communication style and the level of detail to your audience.

Expected full time annual base pay scale for the bay area is $163K-$216K. Actual base pay will consider skills, experience and location.
Based on the role, colleagues may be eligible to participate in an annual bonus plan tied to company and individual performance, or an incentive plan. We also offer a long-term incentive plan to align company and colleague success over time.
In addition, GRAIL offers a progressive benefit package, including flexible time-off, a 401k with a company match, and alongside our medical, dental, vision plans, carefully selected mindfulness offerings.
GRAIL is an Equal Employment Employer and does not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, protected veteran status, disability or any other legally protected status. We will reasonably accommodate all individuals with disabilities so that they can participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment. Please contact us (https://grail.com/about/#contact-us) to request accommodation. GRAIL maintains a drug-free workplace.
GRAIL is an Equal Employment Employer and does not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, protected veteran status, disability or any other legally protected status. We will reasonably accommodate all individuals with disabilities so that they can participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment. Please contact us (https://grail.com/about/#contact-us) to request accommodation. GRAIL maintains a drug-free workplace.

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Question	Topic	Difficulty	Ask Chance
Friendship Timeline	Python & General Programming	Hard	Very High
Rain in N Days	Probability	Hard	Very High
Blogging Platform Schema	Data Modeling	Hard	High

Grail, Inc. Research Scientist Interview Guide

Overview

Grail, Inc. Research Scientist Interview Process

Grail, Inc. Research Scientist Interview Questions

Grail, Inc. Research Scientist Jobs