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What are the Z and t-tests? What are they used for? What is the difference between them? When should use one over the other?

Which statistical test, the Z or t test, is more appropriate for tests with small sample sizes?

Which statistical test, the Z or t test, is more appropriate for tests with small sample sizes?

Z and t Tests I

What happens to the t-distribution as the degrees of freedom (ν) gets large?

What happens to the t-distribution as the degrees of freedom (ν) gets large?

Z and t Tests II

What is the difference between the Z and t tests?

Z and t-Tests

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

Razorpay Salaries by Position

The Role: An Engineering Manager at Razorpay is well-grounded - innovative, quality focussed, product thinker, and business conscious - not mere coders, of course, with deeper technical context and experience to build quality software. You should be able to see nuances and elements that others might not. Engineering creates a significant impact across different areas, considering the scale of our software product outreach. You’re also expected to influence the culture of the company and help shape it the right way. Roles and Responsibilities: <ul><li>Ability to attract and hire top-notch Engineering talent for the organization.</li><li>Be responsible for the group's technical strategy and roadmap - creating success metrics in close collaboration with other groups across the organization, and executing initiatives in an agile way.</li><li>Brings a strong perspective that drives change and motivates engineers to develop simple solutions to complex problems.</li><li>Help implement effective engineering processes and champion their adoption.</li><li>Has the technical capacity and capability to partner with tech leads and architects in problem solving.</li><li>Mentor the professional development of each direct report through personal and performance management.</li><li>Give engineers the tools, confidence, and motivation to make decisions independently that lead to their recognition.</li><li>Effective at influencing a culture of engineering craftsmanship and excellence.</li><li>Initiate cross-functional (Product, Business, Operations) collaborations with development teams throughout Razorpay and gather feedback and requirements.</li><li>Seek diverse perspectives to drive bottom-up innovation and create buy-in from all technical stakeholders.</li><li>Ensure the team fully understands the goals and objectives of Razorpay as a company and how their work fits into 'the bigger picture.</li></ul> Mandatory Qualifications: <ul><li>Total of 10+ years' experience.</li><li>Experience level of 5+ years of experience in very large scale applications and 3+ years' experience in people management.</li><li>Strong problem solving skills, data structures and algorithms.</li><li>Experience with distributed systems handling large amounts of data.</li><li>Excellent coding skills in one of the languages PHP/Python/C++/Java.</li><li>Very good understanding of Web Technologies.</li><li>Very good understanding of any RDBMS and/or messaging.</li></ul> Good to have: We also expect the following, but we accept that you can be an absolutely great developer without fulfilling the below. So go ahead and apply even if the following isn’t applicable:<ul><li>Have a few weekend side projects up on GitHub</li><li>Have contributed to an open-source project</li><li>Have worked at a product company</li><li>Have a working knowledge of a backend programming language</li></ul>

Title: Senior Software Development Engineer The Role: A Senior Software Development Engineer at Razorpay is well-grounded - smart, quality focussed, product thinker, business conscious - not mere coders, of course, with very good technical context and experience to write and build quality software. Engineering creates a significant impact across different areas, considering the scale of our software product outreach. You’re also expected to influence the culture of the company and help shape it in the right way. Roles and Responsibilities: <ul><li>Be involved and drive product & design discussions.</li><li>Help us scale our payment infrastructure to get every Indian to pay online.</li><li>Help us make decisions to shape our REST APIs for developers worldwide.</li><li>Contribute to open source as we set the standards for mobile payments.</li><li>Be involved and drive product & design discussions.</li><li>And, most importantly, brainstorm and create new directions that Razorpay can take in our quest to make online payments easy and accessible to all.</li></ul> Mandatory Qualifications: <ul><li>3+ years of experience in Technology.</li><li>A strong product design sense.</li><li>Good experience in working with any of the programming languages like PHP, Python, Django, Golang, Java, C++</li><li>Understand end-user requirements, formulate use cases and come up with effective solutions.</li><li>Good understanding of REST APIs and the web in general.</li><li>Ability to build a feature from scratch & drive it to completion.</li><li>A willingness to learn new technology, whatever lets you deliver the best product.</li><li>Have a few weekend side projects up on GitHub</li><li>Have contributed to an open-source project</li><li>Have worked at a product company</li><li>Have a working knowledge of a backend programming language</li></ul> Location: Bangalore

The Role: We are seeking a Data Platform Engineer to design and build reliable, scalable data pipelines and infrastructure that power business-critical insights and analytics. You will be responsible for developing data models, optimizing data flows, and ensuring the seamless integration of diverse data sources into our cloud platform. This role provides an exciting opportunity to work with cutting-edge data technologies and collaborate with cross-functional teams to build impactful solutions. Roles and Responsibilities: <ul><li>Design, develop, and maintain data pipelines for real-time and batch processing using Spark, Flink, or Kafka.</li><li>Write optimized SQL queries and scripts to support efficient data transformations.</li><li>Build ETL/ELT workflows and automate repetitive tasks for data ingestion and processing.</li><li>Monitor, troubleshoot, and optimize data pipelines for reliability and uptime.</li><li>Work closely with Data Analysts, Scientists, and Engineers to provide the necessary data infrastructure for analytics and machine learning.</li><li>Ensure data governance, quality, and security throughout the platform.</li><li>Stay up-to-date with emerging technologies and propose best practices for the team.</li></ul> Mandatory Qualifications: <ul><li>2-4 years of experience in data engineering or data platforms.</li><li>Proficiency in Python, Scala, or Golang and hands-on experience in SQL.</li><li>Experience with cloud services (AWS, GCP, or Azure) and data platforms like Redshift, Glue, or BigQuery.</li><li>Knowledge of distributed data systems and tools such as Airflow and Kafka.</li><li>Basic understanding of containerization tools (Docker, Kubernetes).</li></ul>Strong problem-solving skills and a collaborative mindset.

Razorpay Interview Questions

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Razorpay Interview Questions

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