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Chargebee Interview Questions

A/B Testing

Algorithms

Analytics

Machine Learning

Probability

Product Metrics

Python

Statistics

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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?

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?

About Chargebee:Chargebee is a subscription billing and revenue management platform powering some of the fastest-growing brands around the world today, including Calendly, Hopin, Pret-a-Manger, Freshworks, Okta, Study.com and others. Thousands of SaaS and subscription-first businesses process over billions of dollars in revenue every year through the Chargebee platform.Headquartered in San Francisco, USA, our 500+ team members work remotely throughout the world, including India, the Netherlands, Paris, Spain, Australia, and the USA.Chargebee has raised over $480 million in capital and is funded by Accel, Tiger Global, Insight Partners, Steadview Capital, and Sapphire Ventures. And we’re on a mission to push the boundaries of subscription revenue operations. Not just ours, but every customer and prospective business on a recurring revenue model.Our team builds high-quality and innovative software to enable our customers to grow their revenues powered by the state-of-the-art subscription management platform. Job Summary:We are hiring lead engineers to join our Cloud Platform Engineering team to contribute to some of Chargebee’s most critical architectural transformations. You will be working on features such as global distribution, data rebalancing, and tackling challenging problems in storage, reliability, and scalability. What You’ll Do<ol><li>Design and implement improvements across one or more layers of the platform.</li><li>Collaborate with a team of expert engineers to solve complex scaling challenges.</li><li>Understand customer workload requirements and translate them into effective technical solutions.</li><li>Optimize performance through CPU and heap profiling, SQL query rewriting, and data structure optimization.</li><li>Work independently to solve complex engineering problems with a high degree of autonomy.</li></ol> Attributes That Best Describe You<ol><li>You are passionate about building high-performance and scalable systems.</li><li>You have a good understanding of distributed systems concepts (e.g., leasing, replication, leader election), database internals (e.g., WALs, MVCC, compaction), and performance optimization (e.g., multithreading, garbage collection, memory layouts).</li><li>You're at home in terminals and have extensive experience with systems languages such as C++, Go, Rust, or Java.</li><li>You are confident working with large codebases and take pride in writing clean, maintainable, and efficient code.</li><li>You have operated and maintained critical production systems at scale and can debug complex issues across multiple systems.</li><li>You have hands-on experience building and deploying applications in the cloud (AWS, GCP, Azure, etc.).</li></ol> What You Must Have<ol><li>Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field.</li><li>6+ years of software engineering experience focused on backend systems or databases.</li><li>Previous experience at a high-growth technology company.</li><li>Proven experience in building multi-tenant SaaS systems, with an understanding of the associated challenges such as noisy neighbors, backup strategies, and resource isolation.</li><li>Strong communication skills and experience mentoring junior engineers.</li></ol> BenefitsWant to know what it means to work for a company that genuinely cares about you? Check out just a few of the benefits we give our employees: We are Globally LocalWith a diverse team across four continents, and customers in over 60 countries, you get to work closely with a global perspective right from your own neighborhood. We value CuriosityWe believe the next great idea might just be around the corner. Perhaps it’s that random thought you had ten minutes ago. We believe in creating an ecosystem that fosters a desire to seek out hard questions, and then figure out answers to them. Customer! Customer! Customer!Everything we do is driven towards enabling our customers’ growth. This means no matter what you do, you will always be adding real value to a real business problem. It’s a lot of responsibility, but also a lot of fun. Ready to build the future of recurring revenue at scale?Join the Chargebee tribe.

About Chargebee: Chargebee is a subscription billing and revenue management platform powering some of the fastest-growing brands around the world today, including Calendly, Hopin, Pret-a-Manger, Freshworks, Okta, Study.com and others. Thousands of SaaS and subscription-first businesses process over billions of dollars in revenue every year through the Chargebee platform.Headquartered in San Francisco, USA, our 500+ team members work remotely throughout the world, including India, the Netherlands, Paris, Spain, Australia, and the USA.Chargebee has raised over $480 million in capital and is funded by Accel, Tiger Global, Insight Partners, Steadview Capital, and Sapphire Ventures. And we’re on a mission to push the boundaries of subscription revenue operations. Not just ours, but every customer and prospective business on a recurring revenue model.Our team builds high-quality and innovative software to enable our customers to grow their revenues powered by the state-of-the-art subscription management platform. Job Summary: We are looking for a Staff Product Manager to lead high-impact initiatives across AI-powered billing agents and core subscription management capabilities at Chargebee. This role blends ownership of next-generation AI innovations with deep responsibility for subscription workflows. You will work closely with engineering, GTM, and customer-facing teams to deliver solutions that solve complex billing challenges, drive adoption, and enable new business opportunities. Required Skills & Attributes<ul><li>4-8+ years of SaaS product management experience in a leading SaaS company.</li><li>Experience building or working with AI-powered products or AI agents; strong interest in leveraging AI for transformation.</li><li>Ability to roll up the sleeve and get into the depth to understand different concepts related to billing and suggest solutions for winning new business.</li><li>Ability to write and communicate functional requirements clearly to engineering.</li><li>End-to-end delivery of features by coordinating with all stakeholders.</li><li>Experience managing high-volume voice of customer (VOC) for an at-scale product.</li><li>Customer centric and commercial approach combined with ability to go deep and work with engineers.</li><li>Thrive in a fast-paced, sometimes ambiguous environment.</li></ul> BenefitsWant to know what it means to work for a company that genuinely cares about you? Check out just a few of the benefits we give our employees: <ul><li>We are Globally Local</li></ul>With a diverse team across four continents, and customers in over 60 countries, you get to work closely with a global perspective right from your own neighborhood. <ul><li>We value Curiosity</li></ul>We believe the next great idea might just be around the corner. Perhaps it’s that random thought you had ten minutes ago. We believe in creating an ecosystem that fosters a desire to seek out hard questions, and then figure out answers to them. <ul><li>Customer! Customer! Customer!</li></ul>Everything we do is driven towards enabling our customers’ growth. This means no matter what you do, you will always be adding real value to a real business problem. It’s a lot of responsibility, but also a lot of fun. Ready to build the future of recurring revenue at scale?Join the Chargebee tribe.

About ChargebeeChargebee is a subscription billing and revenue management platform powering some of the fastest-growing brands around the world today, including Calendly, Hopin, Pret-a-Manger, Freshworks, Okta, Study.com and others. Thousands of SaaS and subscription-first businesses process over billions of dollars in revenue every year through the Chargebee platform.Headquartered in San Francisco, USA, our 500+ team members work remotely throughout the world, including India, the Netherlands, Paris, Spain, Australia, and the USA. Chargebee has raised over $480 million in capital and is funded by Accel, Tiger Global, Insight Partners, Steadview Capital, and Sapphire Ventures. And we’re on a mission to push the boundaries of subscription revenue operations. Not just ours, but every customer and prospective business on a recurring revenue model. Our Engineering team builds high-quality and innovative software to enable our customers to grow their revenues powered by the state-of-the-art subscription management platform. About the RoleWe are seeking a highly skilled and experienced Lead Software Engineer to join our Merchant Experience charter. In this role, you will lead efforts to deliver product features for setup and site management modules. You are also required to be hands-on. Responsibilities<ul><li>Lead the design and development of product features.</li><li>Mentor and guide team members and strive for continuous improvement</li><li>Establish and track key metrics to measure improvements in engineering efficiency.</li><li>Develop features whenever needed as an individual contributor</li><li>Analyze the tasks and come up with reasonable timelines to deliver features on time.</li><li>Understand customer needs and ensure that solutions align with business objectives and deliver a delightful user experience</li></ul> Requirements<ul><li>Bachelor's or Master’s degree in Computer Science, Engineering, or a related field.</li><li>9+ years of experience in software development, with a proven track record of building and delivering scalable, high-quality software solutions with 2+ years as a lead.</li></ul> Technical Skills:<ul><li>Backend: Hands-on experience in Core Java, MySQL/PostgreSQL, SQL, NoSQL and RESTful APIs.</li><li>Frontend: Hands-on experience in Javascript frameworks (React, Angular, Vue)</li><li>Experience with microservices architecture and cloud platforms such as AWS.</li><li>Experience with Agile methodologies, continuous integration/continuous deployment (CI/CD) pipelines, and DevOps practices.</li></ul> Preferred Qualifications <ul><li>Experience in leading and mentoring a team of developers</li><li>Experience working in fast-paced, agile environments.</li><li>Actively using AI for your work (Coding copilots, etc..)</li></ul>

About Chargebee:Chargebee is a subscription billing and revenue management platform powering some of the fastest-growing brands around the world today, including Calendly, Hopin, Pret-a-Manger, Freshworks, Okta, Study.com and others. Thousands of SaaS and subscription-first businesses process over billions of dollars in revenue every year through the Chargebee platform.Headquartered in San Francisco, USA, our 500+ team members work remotely throughout the world, including India, the Netherlands, Paris, Spain, Australia, and the USA. Chargebee has raised over $480 million in capital and is funded by Accel, Tiger Global, Insight Partners, Steadview Capital, and Sapphire Ventures. And we’re on a mission to push the boundaries of subscription revenue operations. Not just ours, but every customer and prospective business on a recurring revenue model.Our team builds high-quality and innovative software to enable our customers to grow their revenues powered by the state-of-the-art subscription management platform. Job Summary:We are seeking a dynamic Product Manager to join our growing team and play a crucial role in the development and enhancement of Chargebee’s Merchant Experience. As a key member of the Product Management team, you will be responsible for driving the product strategy, execution, and continuous improvement of Chargebee’s Merchant Experience.Job Responsibilities:As Product Manager, you will be responsible for setting the vision, aligning stakeholders, and owning the design & delivery of product capabilities to enhance the Charagebee Merchant Experience. You will be responsible for creating:<ul><li>Customer Discovery: Identify meaningful problems & opportunities, and translate them into clear product requirements, ensuring they are clear, concise and aligned with the product strategy.</li><li>Product Roadmap: Own the development and delivery of the product roadmap. Collaborate with cross-functional teams to prioritise delivery of features to advance Merchant Experience on the Chargebee Platform.</li><li>Documentation: Maintain product documentation, including user guides, release notes, marketing collateral and product announcements.</li><li>Product Marketing: Be the product input to our marketing team to enable effective and impactful product marketing communications.</li><li>Sales Support: Support the sales team with presales activities, including product demonstrations. Help showcase how the product can address a customer's specific challenges and provide a tailored experience.</li><li>Active Collaboration: Collaborate with engineering, sales, marketing, and customer support, to ensure a cohesive approach to product development and customer satisfaction.</li></ul> Qualifications:Who we’re looking for<ul><li>Looking for someone with 6+ years of Product Management experience, leading end-to-end product lifecycles from feature discovery to production release.</li><li>Ability to influence cross-functionally, through first-principles thinking, sharp commercial sense and clear communication</li><li>You think from the customer perspective and are able to balance future opportunities versus immediate needs.</li><li>You possess a remarkable attention to detail while maintaining a clear focus on the broader perspective.</li><li>You are data-driven, you clearly define success metrics and measure progress against them.</li><li>Excellent communication and interpersonal skills.</li><li>Strong analytical and problem-solving skills.</li><li>Desire and drive to work in a fast-paced and high-growth environment.</li></ul> Benefits:Want to know what it means to work for a company that genuinely cares about you?Check out just a few of the benefits we give our employees: We are Globally LocalWith a diverse team across four continents, and customers in over 60 countries, you get to work closely with a global perspective right from your own neighbourhood. We value CuriosityWe believe the next great idea might just be around the corner. Perhaps it’s that random thought you had ten minutes ago. We believe in creating an ecosystem that fosters a desire to seek out hard questions, and then figure out answers to them. Customer! Customer! Customer!Everything we do is driven towards enabling our customers’ growth. This means no matter what you do, you will always be adding real value to a real business problem. It’s a lot of responsibility, but also a lot of fun.

Summary: You will be a key member of the CRM Integration team, driving initiatives to integrate Chargebee with leading CRM platforms seamlessly. Additionally, you will own and evolve the current CRM integration solutions to ensure that Chargebee customers experience smooth and scalable integration. In this role, you would partner with Product Management, Customer Success, Support, Cloud Infrastructure, and other cross-functional teams to deliver integrations that strengthen Chargebee’s position as the preferred subscription billing solution for enterprises. Roles and Responsibilities<ul><li>Participate and contribute in cross-functional forums, making opinionated decisions on integration architecture choices to ensure reliability and scalability.</li><li>Lead the ideation, design, and development of CRM integration applications/services with a focus on data accuracy, security, and governance.</li><li>Author and maintain technical documents, API specs, and implementation guides, ensuring clarity for engineering and solution consulting teams.</li><li>Collaborate closely with product managers to design, build robust CRM connectors.</li><li>Write hands-on code to build frameworks or middleware that facilitate integrations.</li><li>Actively maintain functional and non-functional quality through automated tests, data validation checks, and API automation specific to integrations.</li><li>Own integration quality by performing effective code reviews and proactively identifying issues in data sync or API consumption.</li><li>Troubleshoot and resolve customer-reported issues with urgency and clarity.</li><li>Mentor & coach engineers on best practices for building scalable integrations.</li><li>Champion adoption of Agile practices within the team.</li><li>Engage with managed service partners to ensure high-quality integration delivery, SLA adherence, and support coverage.</li></ul> Must Have<ul><li>7 - 10 years of proven experience in building distributed systems to handle high throughput, low latency, and event-driven architecture.</li><li>Strong knowledge of Java, Distributed Systems, SQL, and NoSQL databases, and an understanding of JavaScript frameworks like Vue, React, or Angular.</li><li>Strong knowledge of RESTful APIs, Webhooks, GraphQL, and data synchronization patterns.</li><li>Experience working on large-scale systems in the Cloud.</li><li>Experience creating/supporting production-grade systems with proven ability to identify and resolve performance bottlenecks.</li><li>Strong debugging skills with tools such as Postman, Datadog, and Splunk.</li><li>Excellent communication skills — ability to simplify complex integration scenarios for both technical and business stakeholders.</li><li>Effective team player with experience mentoring and guiding junior engineers.</li><li>Familiarity with Agile methodologies and tools like JIRA/Confluence.</li></ul> Nice to Haves<ul><li>Experience building and managing enterprise-grade integrations is an advantage.</li><li>Prior work experience in Husbpot or Salesforce CRM is an advantage.</li><li>AWS / Azure architect certifications.</li></ul> Education and Experience B.E. / B.Tech or higher with 7 - 10 years of engineering experience, currently serving as a Lead engineer.

About Chargebee: Chargebee is a subscription billing and revenue management platform powering some of the fastest-growing brands around the world today, including Calendly, Hopin, Pret-a-Manger, Freshworks, Okta, Study.com and others. Thousands of SaaS and subscription-first businesses process over billions of dollars in revenue every year through the Chargebee platform.Headquartered in San Francisco, USA, our 500+ team members work remotely throughout the world, including India, the Netherlands, Paris, Spain, Australia, and the USA. Chargebee has raised over $480 million in capital and is funded by Accel, Tiger Global, Insight Partners, Steadview Capital, and Sapphire Ventures. And we’re on a mission to push the boundaries of subscription revenue operations. Not just ours, but every customer and prospective business on a recurring revenue model. Our team builds high-quality and innovative software to enable our customers to grow their revenues powered by the state-of-the-art subscription management platform. Key Roles & Responsibilities <ul><li>Productionise ML workflows: build and maintain data pipelines for feature generation, ML model training, batch scoring, and real‑time inference using modern orchestration and container frameworks.</li><li>Own model serving infrastructure: implement fast, reliable APIs / batch jobs; manage autoscaling, versioning, and rollback strategies</li><li>Feature‑store development: design and operate feature stores and corresponding data pipelines to guarantee training–serving consistency.</li><li>CI/CD & DevEx: automate testing, deployment, and monitoring of data and model artefacts; provide templated repos and documentation that let data scientists move from notebook to prod quickly.</li><li>Observability & quality: instrument data‑drift, concept‑drift, and performance metrics; set up alerting dashboards to ensure model health.</li><li>Collaboration & review: work closely with data scientists on model experimentation, production‑harden their code, review PRs, and evangelise MLOps best practices across the organisation.</li></ul> Required Skills & Experience <ul><li>3+ years as a ML / Data Engineer working on large-scale, data-intensive systems in cloud environments (AWS, GCP, or Azure), with proven experience partnering closely with ML teams to deploy models at scale.</li><li>Proficient in Python plus one of Go / Java / Scala; strong software‑engineering fundamentals (testing, design patterns, code review).</li><li>Hands on experience in Spark and familiarity with streaming frameworks (Kafka, Flink, Spark Structured Streaming)</li><li>Hands-on experience with workflow orchestrators (Airflow, Dagster, Kubeflow Pipelines, etc.) and container platforms (Docker + Kubernetes/EKS/ECS).</li><li>Practical knowledge of ML algorithms like XGBoost, LightGBM, transformers and deep learning frameworks like pytorch is preferred</li><li>Experience with experiment‑tracking / ML model‑management tools (MLflow, SageMaker, Vertex AI, Weights & Biases) is a plus</li></ul> Benefits:Want to know what it means to work for a company that genuinely cares about you? Check out just a few of the benefits we give our employees: We are Globally LocalWith a diverse team across four continents, and customers in over 60 countries, you get to work closely with a global perspective right from your own neighborhood. We value CuriosityWe believe the next great idea might just be around the corner. Perhaps it’s that random thought you had ten minutes ago. We believe in creating an ecosystem that fosters a desire to seek out hard questions, and then figure out answers to them. Customer! Customer! Customer!Everything we do is driven towards enabling our customers’ growth. This means no matter what you do, you will always be adding real value to a real business problem. It’s a lot of responsibility, but also a lot of fun. If you resonate with Chargebee, have a monstrous appetite for curiosity, and an insatiable urge to learn and build new things, we’re waiting for you! We value people from all backgrounds and are dedicated to hiring and employing a diverse and inclusive workplace.Come be a part of the Chargebee tribe!

Question	Topic	Difficulty	Ask Chance
Boarding Times Bias	Statistics	Medium	Very High
Hundreds of Hypotheses	Statistics	Medium	Very High
Decreasing Comments	Product Metrics	Easy	Very High

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