American Express Interview Questions, Process, and Tips for Experienced

Java 8 introduced new features for working with threads, such as CompletableFuture and parallel streams.

• Java 8 introduced CompletableFuture class for asynchronous programming.

• Parallel streams in Java 8 allow for easy parallelization of operations on collections.

• New methods like `join()` and `thenApply()` were added to the Thread class in Java 8.

Designing a scalable system involves considering factors like load balancing, horizontal scaling, and fault tolerance.

• Utilize load balancing to distribute traffic evenly across servers.

• Implement horizontal scaling by adding more servers to handle increased load.

• Ensure fault tolerance by designing for redundancy and failover mechanisms.

• Use caching and database sharding to improve performance and scalability.

• Consider mic...read more

Debugging and optimizing code involves identifying and fixing errors and improving performance.

• Use debugging tools like breakpoints, print statements, and logging to identify issues

• Analyze code for inefficiencies and refactor where necessary

• Optimize algorithms and data structures for better performance

• Profile code to identify bottlenecks and optimize critical sections

• Test changes to ensure they improve performance with

Convince customers to pay more by highlighting the value of the product/service, offering discounts for early payment, and providing flexible payment options.

• Highlight the value of the product/service and how it meets the customer's needs

• Offer discounts for early payment to incentivize prompt payment

• Provide flexible payment options such as installment plans or payment extensions

• Emphasize the benefits of paying more, su...read more

I have 5 years of experience as a Senior Customer Service Advisor with extensive product knowledge in telecommunications.

• Managed a team of customer service representatives to ensure high levels of customer satisfaction

• Provided in-depth product knowledge training to new hires and existing team members

• Handled escalated customer complaints and resolved issues in a timely and efficient manner

• Collaborated with product devel...read more

SQL query using CASE WHEN THEN statement

• Use CASE WHEN statement to create conditional logic in SQL queries

• Syntax: SELECT column_name, CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ELSE result3 END AS new_column_name FROM table_name

• Example: SELECT name, CASE WHEN age < 18 THEN 'Minor' ELSE 'Adult' END AS age_group FROM customers

SQL query to join tables based on a common key

• Use JOIN keyword to combine rows from two or more tables based on a related column between them

• Specify the columns to be joined in the ON clause

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN