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Calance 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?

**Our Client:** A leading provider of cloud-native In-car Automotive solutions is seeking a Senior Golang AWS Developer. This role offers the chance to architect next-gen platforms that process millions of real-time transactions while mentoring a global engineering team. **Position:** Senior Golang AWS Developer **Duration:** 1 year +**Location:** Plano, TX**Work Arrangement:** Onsite in Plano, TX **Role Summary:** Step into a high-visibility position where your code will power mission-critical services used by drivers, fleet operators, and payment partners worldwide. You’ll own the full AWS cloud stack, optimize petabyte-scale MongoDB clusters, and shape CI/CD standards that accelerate feature delivery. If you thrive on turning complex requirements into resilient, observable microservices—and love elevating offshore teammates—this is your stage. What we are looking for: A proven track record in architecting and deploying robust, cloud-native solutions on AWS. In this onsite role, you’ll collaborate closely with a Technical Architect and take the lead in guiding an offshore engineering team. The right candidate brings advanced knowledge of Golang microservices, MongoDB, Kubernetes, observability tools (OpenTelemetry and Datadog), and modern CI/CD practices.Key Responsibilities• Design and architect Golang-based microservices using Gorilla Mux and gRPC frameworks• Manage large-scale data operations with MongoDB, focusing on indexing and schema optimization• Take ownership of the entire application lifecycle on AWS, including API Gateway, Lambda, EKS, EC2, and S3• Develop and maintain containerized environments with Docker and Helm• Implement comprehensive observability with OpenTelemetry, exporting metrics and logs to Datadog• Lead and enhance CI/CD workflows using GitLab and GitHub Actions• Troubleshoot complex production issues and drive root cause analysis• Mentor offshore developers, fostering quality and best practices throughout the teamRequirements • 10-15+ years in backend software development, with at least 7 years in Golang• Extensive experience with MongoDB, including NoSQL data modeling and performance tuning• Strong background in AWS deployments and architecture• Proficient with Kubernetes, Docker, and Helm for container orchestration• Expertise in CI/CD automation (GitLab, GitHub Actions)• Advanced Linux scripting and debugging skills• Hands-on experience with TDD and SonarQube to ensure code quality• Excellent communication, leadership, and cross-functional teamwork abilitiesPreferred Experience• Knowledge of EV telematics and integrating with Stripe or Zuora• Experience with payment systems such as Apple Pay, Google Pay, or cryptocurrency payment solutions• Frontend development skills with Vue.js or React.js

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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