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Adyen Interview Questions

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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

Let’s say you work for a social media company that has just done a launch in a new city. Looking at weekly metrics, you see a slow decrease in the average number of comments per user from January to March in this city.

The company has been consistently growing new users in the city from January to March.

What are some reasons why the average number of comments per user would be decreasing and what metrics would you look into?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

Decreasing Comments

How would you investigate a decline in the average number of comments per user?

Adyen Salaries by Position

We're looking for our next generation of C++ engineers to join our Payments Solution in Chicago. Let's guide you through what it means to be an Engineer at Adyen: This is Adyen Adyen is the payment platform of choice for the world's leading companies, delivering frictionless payments across online, mobile, and in-store channels. Our team members are motivated individuals who help each other do remarkable things daily. We face unique technical challenges at scale, and we solve those as a team. Together, we deliver innovative and ethical solutions that transform how the world pays. We took a new approach to starting a payments company, building a platform from scratch. Now, Adyen serves the world's brightest companies like Meta, Uber, L'Oreal, Casper, Etsy, and Spotify. Senior C++ Engineer Adyen is looking for a full-time Senior C++ Engineer to help us develop our in-person payments solution. We have a large and varied fleet of payment terminals in the field, which we continuously improve by adding new features and payment methods. You will be working on developing our main business logic in C++ and other programming languages such as Kotlin, Python, or Java. We value your opinion and ideas. You're encouraged to propose improvements and new solutions for your team and the platform. You will also have the freedom and opportunity to work on projects that will bring innovation and keep Adyen ahead of their competition. With freedom comes responsibility; you're expected to take ownership of the features you work on and be involved in designing, implementing, testing, and monitoring the new functionality to ensure a sustainable and secure solution. Testing methods range from unit testing to complete product testing via automated programmable robots. At Adyen, we have a development team working with various technologies. We love to solve hard technical problems effectively, take ownership, and want to work as part of an efficient team of professionals. We are constantly looking for the right balance between elegant solutions and time-to-market. In other words, you can work in a comfortable but dynamic and commercial environment. What you'll do As a Senior C++ Software Engineer, you will work on a solution for Payment Devices with many capabilities. These capabilities include: <ul><li>Accepting payments with credit cards, phones, and QR codes.</li><li>Harmonizing a complex software solution across various payment terminal vendors, leading to a single software solution used in retail, hotels, and restaurants.</li><li>Integration with a variety of cash registers using state-of-the-art standards.</li><li>Bringing a new perspective on best engineering practices, improvements, and opportunities.</li><li>Leading complex technical projects from requirements analysis through design, implementation, testing, and launch into production.</li><li>Being hands-on and contributing to the implementation while offering technical guidance and mentoring to other engineers.</li><li>Mentoring and guiding engineers to improve their technical skills and make informed decisions.</li><li>Working from the office at least three days per week. </li></ul> Who you are <ul><li>Open-minded with a proactive attitude, able to solve an immediate problem while factoring in the bigger picture</li><li>Enthusiastic about sharing your knowledge and developing yourself</li><li>Skilled at collaborating with various people, including senior leaders, Product Managers, Android Engineers, iOS Engineers, Kotlin Engineers, and other Software Engineers</li><li>Ability to provide reliable and clean code</li></ul> Required qualifications <ul><li>8+ years of development experience in C++ 14/17/20 </li><li>Multithreaded and Multi-process architecture knowledge</li><li>IPC, RPCs, Object Oriented Design, Data Structures and algorithms</li></ul> Nice to have <ul><li>Additional programming knowledge/experience - Kotlin and Java </li><li>Knowledge of databases (Postgresql, SQLite)</li><li>Card payment (EMV, ISO8583, ISO20022) knowledge</li></ul> Our Diversity, Equity, and Inclusion commitments Our unique approach is a product of our diverse perspectives. This diversity of backgrounds and cultures is essential in helping us maintain our momentum. Our business and technical challenges are unique, and we need as many different voices as possible to join us in solving them - voices like yours. No matter who you are or where you're from, we welcome you to be your true self at Adyen. Studies show that women and members of underrepresented communities apply for jobs only if they meet 100% of the qualifications. Does this sound like you? If so, Adyen encourages you to reconsider and apply. We look forward to your application! What's next? Ensuring a smooth and enjoyable candidate experience is critical for us. We aim to get back to you regarding your application within 5 business days. Our interview process tends to take about 4 weeks to complete, but may fluctuate depending on the role. Learn more about our hiring process here. Don't be afraid to let us know if you need more flexibility. This role is based out of our Chicago office. We are an office-first company and value in-person collaboration; we do not offer remote-only roles.

Adyen provides payments, data, and financial products in a single solution for customers like Meta, Uber, H&M, and Microsoft - making us the financial technology platform of choice. At Adyen, everything we do is engineered for ambition.For our teams, we create an environment with opportunities for our people to succeed, backed by the culture and support to ensure they are enabled to truly own their careers. We are motivated individuals who tackle unique technical challenges at scale and solve them as a team. Together, we deliver innovative and ethical solutions that help businesses achieve their ambitions faster.Adyen is continuously exploring new opportunities that address evolving merchant needs beyond our core payment offering. Leveraging our expansive and accurate understanding of consumers, we are identifying and pursuing new product areas that will expand our portfolio. We are seeking a high-impact, entrepreneurial Senior Product Manager that will be instrumental in building zero to one products, creating entirely new experiences and offerings that meet unmet merchant needs. The role requires thinking holistically about merchant problems, working cross-functionally with design, engineering, and other stakeholders, and guiding new products from inception through launch.<h3>What You'll Do:</h3><ul><li>Product Strategy: Define product vision and strategy by deeply understanding merchant pain points, market opportunities, and competitive landscapes. Identify and validate new opportunities for growth.</li><li>Customer-Centric Development: Engage directly with merchants and leverage data to generate insights, guide product decisions, and prioritize initiatives that create value.</li><li>Zero-to-One Execution: Lead the full product lifecycle, from initial concept through to go-to-market strategy, ensuring alignment across stakeholders and partners to effectively deliver high-quality, scalable solutions.</li><li>Build vs Buy Evaluations: Assess when to build functionality in-house versus when to leverage third-party solutions through strategic partnerships. Make informed decisions that optimize for speed, cost, and long-term scalability.</li><li>Cross-Functional Leadership: Collaborate closely with engineering, design, data science, marketing, and commercial teams to build and launch pilots/MVPs. Ensure clear communication and alignment across teams.</li><li>Performance & Iteration: Define metrics and KPIs to gauge the success of newly launched products, and iterate rapidly based on feedback, usage data, and changing market dynamics.</li><li>Stakeholder Management: Present product concepts, updates, and results to executive leadership and secure buy-in on product directions and investments.</li></ul><h3>Who You Are:</h3><ul><li>5 + years of experience as a Product Manager in a SaaS environment, successfully leading cross-functional teams to develop and launch innovative software solutions.</li></ul>Our ideal fit for this role is someone with the following attributes:<ul><li>Customer Obsessed: You have a relentless focus on understanding and solving customer problems, and you use appropriate data and research to ensure solutions are impactful.</li><li>Strategic Thinker: You are excited about creating something new, often from scratch, and you think big, connecting market opportunities with long-term business growth.</li><li>Results-Oriented: You have a proven track record of shipping products from zero to one. You’re motivated by delivering outcomes and can prioritize effectively to move the needle on important initiatives.</li><li>Entrepreneurial: You thrive in ambiguity and are comfortable taking ownership of undefined spaces. You love exploring uncharted territories and have a bias toward action in fast-moving environments.</li><li>Strong Communicator: You can articulate complex ideas and align cross-functional teams around a shared vision. You know how to influence and inspire across all levels of the organization.</li><li>Simplifier: You have the ability to take an ambiguous or complex space and break it down into clear, actionable components. You help the team focus on the areas that matter most, making the problem space easier for your team to execute.</li><li>Analytical & Data-Driven: You ground decisions in data and are comfortable using both qualitative and quantitative methods to inform product development and iteration.</li><li>Adaptable & Resilient: You’re able to pivot quickly based on feedback or market shifts, and you maintain momentum even when faced with challenges or uncertainty.</li></ul>Our Diversity, Equity and Inclusion commitmentsOur unique approach is a product of our diverse perspectives. This diversity of backgrounds and cultures is essential in helping us maintain our momentum. Our business and technical challenges are unique, and we need as many different voices as possible to join us in solving them - voices like yours. No matter who you are or where you’re from, we welcome you to be your true self at Adyen.Studies show that women and members of underrepresented communities apply for jobs only if they meet 100% of the qualifications. Does this sound like you? If so, Adyen encourages you to reconsider and apply. We look forward to your application!What’s next?Ensuring a smooth and enjoyable candidate experience is critical for us. We aim to get back to you regarding your application within 5 business days. Our interview process tends to take about 4 weeks to complete, but may fluctuate depending on the role. Don’t be afraid to let us know if you need more flexibility.Adyen is an equal opportunity employer. We do not discriminate based on race, color, ethnicity, ancestry, national origin, religion, sex, gender, gender identity, gender expression, sexual orientation, age, disability, veteran status, genetic information, marital status or any legally protected status.All your information will be kept confidential according to EEO guidelines.This role is based out of our Chicago office. We are an office-first company and value in-person collaboration; we do not offer remote-only roles.The way we work is guided by the eight principles of the Adyen Formula.No one only manages a search bar or a small feature. At Adyen, you’ll see each solution through the entire lifecycle, from conception to implementation to iteration. If you’re ready to think about the entire solution, then Adyen is right for you.
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This is Adyen Adyen provides payments, data, and financial products in a single solution for customers like Meta, Uber, H&M, and Microsoft - making us the financial technology platform of choice. At Adyen, everything we do is engineered for ambition. For our teams, we create an environment with opportunities for our people to succeed, backed by the culture and support to ensure they are enabled to truly own their careers. We are motivated individuals who tackle unique technical challenges at scale and solve them as a team. Together, we deliver innovative and ethical solutions that help businesses achieve their ambitions faster. What you'll do <ul><li>Bring your own point of view on best engineering practices </li><li>Collaborate across teams and time zones to get projects over the finish line</li><li>Lead complex technical projects from requirements analysis through design, implementation, testing and launch into production</li><li>Be hands on and contribute to the implementation, but at the same time offer technical guidance and mentoring to other engineers</li><li>Identify and improve parts of the platform to make it more robust and scalable</li><li>Your code will be used at scale and you are expected to think in that mindset when building features.</li><li>We launch fast and iterate often. Concretely, this means that within your first few weeks, you will bring live functionalities that impact many merchants and shoppers. </li></ul> Who you are <ul><li>You have at least 8 years of professional experience as an engineer and are currently working as a Senior Software Engineer or at a similar level</li><li>You have great communication skills and the ability to articulate complex technical concepts in front of different stakeholders</li><li>Familiar with complex large scale distributed systems</li><li>You are flexible, a team player, someone with an eye for detail.</li><li>Experienced in leading technical projects in a fast paced environment</li><li>Open to some domestic and international travel</li></ul> Required technical qualifications: <ul><li>Demonstrated knowledge of building Java based web services (RESTful, SOAP)</li><li>Experienced in designing performant database models in PostgreSQL or other relational databases</li><li>Knowledgeable of various software architecture paradigms such as event-driven or message queueing systems</li></ul> Our Diversity, Equity and Inclusion commitments Our unique approach is a product of our diverse perspectives. This diversity of backgrounds and cultures is essential in helping us maintain our momentum. Our business and technical challenges are unique, and we need as many different voices as possible to join us in solving them - voices like yours. No matter who you are or where you're from, we welcome you to be your true self at Adyen. Studies show that women and members of underrepresented communities apply for jobs only if they meet 100% of the qualifications. Does this sound like you? If so, Adyen encourages you to reconsider and apply. We look forward to your application! What's next? Ensuring a smooth and enjoyable candidate experience is critical for us. We aim to get back to you regarding your application within 5 business days. Our interview process tends to take about 4 weeks to complete, but may fluctuate depending on the role. Don't be afraid to let us know if you need more flexibility. Adyen is an equal opportunity employer. We do not discriminate based on race, color, ethnicity, ancestry, national origin, religion, sex, gender, gender identity, gender expression, sexual orientation, age, disability, veteran status, genetic information, marital status or any legally protected status. All your information will be kept confidential according to EEO guidelines. This role is based out of our Chicago office. We have a hybrid workplace and value in-person collaboration; we do not offer remote-only roles.

Adyen Interview Questions

Adyen Interview Guides

Adyen Interview Questions

Adyen Salaries by Position

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