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Flexton inc. 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?

In an A/B test, how can you check if assignment to the various buckets was truly random?

In an A/B test, which of the following is a common method to determine if the assignment to the test groups was truly random?

In an A/B test, which of the following is a common method to determine if the assignment to the test groups was truly random?

Random Bucketing

A/B Testing & Experimentation

Flexton inc. Salaries by Position

Greetings from Flexton!Hope you are doing great today!One of my clients is looking for Java Developer::T4@ Toronto, Canada please share me your updated resume and desire rate for this position. Job Description:Bachelor's degree in computer science or related field plus 5+ years of experience in Java in building large-scale web based distributed systems.Thorough understanding in computer science fundamentals, data structures and algorithms and extensive experience in building highly available, scalable and robust applications.Excellent object-oriented design and coding skills in Java or other OO languages, hands-on experience using unit/integration test frameworks like Karate to build fully automated software applications.Solid understanding of relational and NoSQL databases, data storage/access patterns, caching techniques, messaging systems and asynchronous workflows.Experience with bug triaging and debugging techniques, logging and monitoring systems, application, and query performance tuning.Good understanding of web services and SOA related standards like REST/OAuth/JSON.Familiarity with front end technologies and patterns is desirable.Excellent verbal and written communication skills.

This is an Excellent Opportunity to work with Enterprise Global Retail/eCommere Client. Role: Java Software Engineer Location: Bengaluru, India Work Mode: Hybrid (3 Days Onsite, 2 Days Remote)Note: We are looking for candidates who are Immediate Joiners or have up to a 30-day notice period and can start as soon as possible (ASAP). Job Summary:We are seeking an experienced Java Software Engineer with strong expertise in Java, Spring Boot, and hands-on experience with Apache Flink. The ideal candidate will work on developing real-time data processing products and backend services.Key Responsibilities:<ul><li>Develop and maintain real-time data processing solutions using Java and Apache Flink.</li><li>Build scalable backend services and RESTful APIs using Spring Boot.</li><li>Work on data product development within distributed and data-processing environments.</li><li>Collaborate with cross-functional teams to deliver high-quality and efficient backend components.</li></ul> Required Skills:<ul><li>Strong experience in Java and Spring Boot backend development.</li><li>Hands-on expertise with Apache Flink for real-time or batch data processing.</li><li>Solid understanding of distributed systems, data pipelines, and data-processing fundamentals and strong DSA problem Solving skills.</li><li>Experience working with real-time streaming systems or batch processing frameworks within Large eComemrce/Retail or Product environment.</li></ul>

About the RoleWe are seeking a highly skilled Frontend/Full-Stack Engineer with strong experience in modern JavaScript frameworks, GraphQL integration, accessibility best practices, and end-to-end test automation. The ideal candidate is detail-oriented, collaborative, and passionate about building high-quality, user-centric web applications. Key Responsibilities<ul><li>Develop, enhance, and maintain web applications using JavaScript, HTML, CSS, and Node.js.</li><li>Integrate and query data using GraphQL, ensuring efficient and optimized data flows.</li><li>Collaborate with cross-functional teams to design intuitive, accessible, and scalable UI components.</li><li>Implement and uphold web accessibility standards (WCAG) across all front-end features.</li><li>Build and maintain end-to-end test automation using Playwright.</li><li>Participate in code reviews, architectural discussions, and agile ceremonies.</li><li>Troubleshoot production issues and deliver high-quality, maintainable solutions.</li></ul> Required Qualifications<ul><li>Strong proficiency in JavaScript (ES6+), HTML5, and CSS3.</li><li>Experience with GraphQL integration and API consumption.</li><li>Hands-on experience working with Node.js in a production environment.</li><li>Working knowledge of web accessibility standards and tools.</li><li>Experience with Playwright for automated end-to-end testing.</li><li>Familiarity with Git, CI/CD pipelines, and modern development workflows.</li><li>Strong problem-solving skills and the ability to work in a hybrid, collaborative environment.</li></ul> Preferred Qualifications (Nice to Have)<ul><li>Experience with modern front-end frameworks (React, Vue, or similar).</li><li>Knowledge of component libraries and design systems.</li><li>Familiarity with cloud platforms (AWS, GCP, or Azure).</li><li>Experience in performance optimization and responsive design.</li></ul>

Role: Data Engineer (Spark | SQL | Big Data Pipelines)Location: Bengaluru, IndiaExperience Neeeded: Spark, SQL, Data Streaming/Batch Processing, HDFS, Kafka StreamingNote: We’re specifically looking for immediate joiners or candidates who are ready to start immediately or with a very short notice period. Must be Local to Bengalore and comfortable working on Hybrid Model. About the RoleWe are looking for a Data Engineer with 3–5 years of hands-on experience in building and optimizing data pipelines using Apache Spark and SQL. The ideal candidate will have a solid understanding of batch data processing, Data Streaming, data reliability, and performance optimization. You will collaborate with cross-functional teams to design scalable data solutions that support analytics and business objectives.Must-Have Skills:<ul><li>3–5 years of hands-on experience with Apache Spark (including SparkSQL).</li><li>Strong SQL expertise — ability to write complex, optimized queries.</li><li>Solid batch processing experience (scheduling, dependencies, performance tuning).</li><li>Good understanding of data pipeline architecture and fundamentals.</li><li>Experience handling structured and semi-structured data (CSV, JSON, Parquet).</li></ul>Good to Have<ul><li>Python or PySpark experience (not mandatory but preferred).</li><li>Exposure to data warehousing concepts and relational databases.</li></ul> About Client: A global e-commerce leader enabling millions of buyers and sellers to connect across markets. The platform delivers secure, scalable, and data-driven marketplace experiences. Engineers here build solutions that shape the future of digital commerce through innovation in payments, logistics, AI, and customer experience.

Flexton Inc., established in 2007, headquarter is in San Jose, CA with development centers in India at multiple locations. We are a leading professional services company offering a unique product mix that extends into Technology, Consulting, Digital and Operations. Flexton has been recognized multiple times by Inc. 5000 as the Fastest Growing Company Senior Java Software Developer Location: Bangalore, India (Hybrid)Senior Backend Engineer – (Bengaluru) Job Description:<ul><li>Strong expertise in Java and the Spring Framework, particularly Spring Boot.</li><li>Good understanding of SQL, Oracle, SQL server or similar languages.</li><li>Core Engineering: Data structures & algorithms, testing (Junit etc), Git, clean code.</li><li>Ops & CI/CD: Monitoring (Prometheus/Grafana), logging, pipelines (Jenkins/GitHub Actions).</li><li>Cloud Native: Docker, Kubernetes (deploy, network, scale, troubleshoot).</li><li>6+ years of directly applicable experience</li><li>BS in Computer Science, Engineering, or equivalent experience.</li></ul> Regards,Rahul Shrivastava

We are seeking a highly skilled and motivated Java Backend Engineer to join our dynamic team. In this role, you will be responsible for building and maintaining scalable, high-performance backend systems. You will work with modern technologies such as Microservices, Spring Boot, and APIs, and collaborate with cross-functional teams to deliver innovative and efficient solutions. This is a hybrid role, offering the flexibility of remote work with occasional in-office collaboration in Sunnyvale, CA Responsibilities:Backend Development: Design, implement, and maintain backend services and applications using Java and Spring Boot.Microservices Architecture: Develop and maintain scalable Microservices that communicate seamlessly through well-designed APIs.System Design: Collaborate on system design, architecture, and strategy to build resilient, highly performant systems.API Development: Create and integrate RESTful APIs for internal and external services, ensuring reliability and high availability.Optimization: Optimize applications for maximum speed and scalability, ensuring that systems can handle increasing loads and complex business logic.Data Structures & Algorithms: Utilize advanced knowledge of Data Structures and Algorithms to solve complex problems, enhance application performance, and improve system efficiency.Collaborative Problem Solving: Work closely with cross-functional teams, including front-end engineers, product managers, and DevOps, to ensure successful project delivery. Required Qualifications:Experience: 6+ years of professional experience in backend development using Java.Expertise in Spring Boot: Strong experience in developing Microservices and backend applications using Spring Boot.Microservices: Hands-on experience in building and deploying Microservices in a cloud environment (AWS, Azure, GCP).APIs: Expertise in designing and developing RESTful APIs, with a focus on performance and security.Data Structures & Algorithms: Strong understanding of Data Structures and Algorithms, and the ability to apply this knowledge in solving real-world problems.Database Experience: Proficiency with relational and NoSQL databases, including SQL and MongoDB.Problem-Solving Skills: Excellent analytical and problem-solving abilities, with the ability to think critically and independently.

Below is the complete job description Data EngineerBangalore, IndiaHybrid We are seeking a Data Engineer with hands-on experience in Spark and SparkSQL, strong SQL expertise, and solid batch processing experience. The role involves building and optimizing data pipelines to support analytics and business needs, ensuring data reliability and performance, and collaborating effectively with cross-functional teams. Must Have skills :Spark, Spark SQL, working experience with spark. Very Strong SQL, Batch Exp is a must have. Good Project Experience.Python is a plus not a must have. Data Engineer Job Description: • Hands-on experience with Apache Spark (especially Spark SQL and batch processing).• Strong SQL expertise — ability to write efficient, optimized, and complex SQL queries for large datasets.• Solid understanding of data pipeline fundamentals, including ingestion, transformation, and loading (ETL/ELT) processes.• Must have experience with batch data processing (scheduling, dependencies, failure recovery, performance tuning).• Knowledge of data warehousing concepts and familiarity with relational databases.• Experience working with structured and semi-structured data (CSV, Parquet, JSON, etc.).• Strong problem-solving and debugging skills, particularly around pipeline performance and data quality.

Role: Data Engineer (Spark | SQL | Big Data Pipelines)Location: Bengaluru, IndiaExperience Neeeded: Spark, SQL, Data Streaming/Batch Processing, HDFSNote: We’re specifically looking for immediate joiners or candidates who are ready to start immediately or with a very short notice period. Must be Local to Bengalore and comfortable working on Hybrid Model. About the RoleWe are looking for a Data Engineer with 3–5 years of hands-on experience in building and optimizing data pipelines using Apache Spark and SQL. The ideal candidate will have a solid understanding of batch data processing, data reliability, and performance optimization. You will collaborate with cross-functional teams to design scalable data solutions that support analytics and business objectives.Key Responsibilities<ul><li>Design, build, and optimize data pipelines for ingestion, transformation, and loading (ETL/ELT).</li><li>Work extensively with Spark and SparkSQL for batch data processing.</li><li>Develop and maintain efficient SQL queries for large-scale data operations.</li><li>Monitor and troubleshoot pipeline performance, dependencies, and data quality issues.</li><li>Collaborate with analytics, data science, and business teams to ensure reliable and accessible data.</li></ul>Must-Have Skills<ul><li>3–5 years of hands-on experience with Apache Spark (including SparkSQL).</li><li>Strong SQL expertise — ability to write complex, optimized queries.</li><li>Solid batch processing experience (scheduling, dependencies, performance tuning).</li><li>Good understanding of data pipeline architecture and fundamentals.</li><li>Experience handling structured and semi-structured data (CSV, JSON, Parquet).</li></ul>Good to Have<ul><li>Python or PySpark experience (not mandatory but preferred).</li><li>Exposure to data warehousing concepts and relational databases.</li></ul> About Client: A global e-commerce leader enabling millions of buyers and sellers to connect across markets. The platform delivers secure, scalable, and data-driven marketplace experiences. Engineers here build solutions that shape the future of digital commerce through innovation in payments, logistics, AI, and customer experience.

Question	Topic	Difficulty	Ask Chance
Boarding Times Bias	Statistics	Medium	Very High
Hundreds of Hypotheses	Statistics	Medium	Very High
Random Bucketing	A/B Testing & Experimentation	Medium	Very High

Flexton inc. Interview Questions

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Flexton inc. Interview Questions

Flexton inc. Salaries by Position

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