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Let’s say you are designing a marketplace for your website.

Selling firearms is prohibited by your website’s Terms of Service Agreement (not to mention the laws of your country). To this end, you want to create a system that can automatically detect if a listing on the marketplace is selling a gun.

How would you go about doing this?

While designing a system to detect firearms listings on a marketplace website, what metrics could be used to minimize both false positives and false negatives?

While designing a system to detect firearms listings on a marketplace website, what metrics could be used to minimize both false positives and false negatives?

Detecting Firearm Sales

How would you build a model to detect if a post on a marketplace is talking about selling a gun?

Let’s say you’re tasked with building the YouTube video recommendation algorithm.

How would you design the recommendation system?

What are important factors to keep in mind when building the recommendation algorithm?

Youtube Recommendations

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

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THE JOB The Senior Data Engineer must possess expertise in Oracle Database technologies, including SQL and PL/SQL. The ideal candidate will demonstrate a strong ability to design and implement scalable, high-performance software solutions while architecting complex, multi-tiered applications. This role involves working closely with cross-functional teams to maintain technical excellence and ensure solutions are aligned with business objectives. As part of this role, the Senior Engineer will take ownership of architecting multi-tiered applications, ensuring seamless integration of diverse data sources such as relational databases and streaming services. The individual will be responsible for driving the technical direction of projects by selecting the right tools and technologies, evaluating architectural choices, and implementing best practices for software development. We believe in solving complex issues through collaboration and teamwork, so being a team player is a key characteristic that we look for in our engineers. Key Responsibilities:<ul><li>Assist with large scale platform moderinization effort by migrating complex code from another RDBMS system to Oracle.</li><li>Collaborate with data scientists, analysts, and business users to understand data requirements and ensure data is structured effectively.</li><li>Optimize queries, indexes, and database structures to improve performance and reduce query times.</li><li>Enforce data security policies and governance frameworks to protect sensitive data.</li><li>Build data models, views, and tables to support reporting and business intelligence tools.</li><li>Collaborate with cross-functional teams to understand business requirements and deliver data solutions.</li><li>Oversee and contribute to CI/CD pipelines using tools such as Docker, Kubernetes, and AWS to streamline the build, deployment, and monitoring processes.</li><li>Evaluate and select appropriate technologies for the development and maintenance of enterprise-level applications.</li><li>Mentor junior engineers, providing guidance on software design, system architecture, and best practices in database technologies.</li><li>Collaborate closely with product managers, architects, and QA teams to deliver high-quality solutions aligned with business objectives.</li></ul> WHAT YOU NEED TO KNOW (or TECHNICAL SKILLS/COMPETENCIES)<ul><li>Strong proficiency in Oracle Database (Oracle 11g, 12c, or higher) and related tools (SQL, PL/SQL, Oracle Data Integrator, Oracle GoldenGate).</li><li>Experience with other RDBMS such as ASA or SQL Server.</li><li>Familiarity with data modeling techniques and relational database design.</li><li>Expertise in building and maintaining CI/CD pipelines, deploying applications using Docker and Kubernetes.</li><li>Knowledge of performance tuning techniques for Oracle databases.</li><li>Experience with version control systems like Gitlab and issue tracking tools like JIRA.</li><li>Experience with Kafka and other streaming services.</li><li>Strong knowledge of OOP concepts, data structures, and algorithms.</li><li>Proven experience designing, developing, and deploying large-scale, distributed enterprise applications.</li><li>Hands-on experience with Agile methodologies and test-driven development for software robustness, usability, and performance.</li><li>Familiarity with RESTful web services and microservices architecture.</li></ul>

THE JOB You will be joining a Java development team as a Software Engineer. The team you will be joining is responsible for providing business-to-business (B2B) reporting solutions to our clients. The team leverages Java technologies to provide web-based reporting UIs and supporting backend services including APIs which are containerized for deployment. At the core of the reporting solution is Tableau and an associated reporting database with data ingested from data queues. There is a tremendous opportunity for you to make a difference. We are looking for engineers who can help us drive our platform forward from a technical point of view, and who are willing to take on new challenges and technologies. You will work closely with your team lead and will be responsible for hands-on software development to the highest standards of code quality and performance, as well as assisting in the planning and decision-making process. Expertise in Microsoft technologies - especially Java – is vital, but we engage with many other technologies including Amazon Web Services, infrastructure as code, continuous deployment, and front-end technologies like React. WHAT YOU WILL BE DOING<ul><li>Hands-on software development, predominantly using Java and Spring Boot. </li><li>Architect, design, and develop robust, scalable, and maintainable microservices. </li><li>Lead the integration of diverse data sources (RDBMS, NoSQL, streaming platforms) to ensure seamless functionality and high availability.</li><li>Create and maintain architectural blueprints, guiding the team to ensure best practices in software design, coding standards, and system performance.</li><li>Design and implement event-driven architectures and domain-driven designs to handle complex business logic.</li><li>Oversee and contribute to CI/CD pipelines using tools such as Docker, Kubernetes, and AWS to streamline the build, deployment, and monitoring processes.</li><li>Evaluate and select appropriate technologies for the development and maintenance of enterprise-level applications.</li><li>If required, mentor junior engineers, providing guidance on software design, system architecture, and best practices in Spring Boot.</li><li>Collaborate closely with product managers, architects, and QA teams to deliver high-quality solutions aligned with business objectives</li><li>Working collaboratively with a team of like-minded developers to design and deliver software solutions in an agile environment.</li><li>Documenting and demonstrating solutions by developing documentation, flowcharts, layouts, diagrams, charts, code comments and clear code.</li><li>Contributing to the development of Infrastructure as Code (IAC).</li><li>Functioning in a collaborative environment with teams spread across the globe.</li></ul> WHAT YOU NEED TO KNOW (or TECHNICAL SKILLS) Must have:<ul><li>Java(Ver 11+) developer with 5-7 years hands-on experience in microservices development using Spring Boot framework.</li><li>Design, develop, and maintain Tableau dashboards and reports to visualize data insights and support business objectives.</li><li>Proven experience designing, developing, and deploying large-scale, distributed enterprise applications.</li><li>Expertise in RDBMS (Postgres/MSSql/Oracle etc.) and NoSQL databases (Dynamo Db/Cassandra).</li><li>Proven experience in Event-Driven Architecture and Domain-Driven Design.</li><li>Expertise in building and maintaining CI/CD pipelines, deploying applications using Docker and Kubernetes.</li><li>Experience with Kafka or other streaming services.</li><li>Hands-on experience in test-driven development using JUnit and Mockito. </li><li>Sound knowledge of OOP, Design Patterns and SOLID design principles</li><li>Hands on experience in Git version-control. </li><li>Excellent Debugging / Troubleshooting skills.</li></ul> Nice to have:<ul><li>Development experience with Python language.</li><li>Experience with AWS services like SQS/SNS etc.</li><li>Experience with the project management and issue-tracking tool JIRA.</li></ul>

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Ticketmaster Interview Questions

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