Subex Product Engineer Interview Questions and Answers

Telecom sources refer to the data sources used by telecommunication companies to collect Call Detail Records (CDRs) for billing and analysis purposes.

• Telecom sources are used to collect CDRs for billing and analysis purposes

• CDRs obtained from telecom sources include information such as call duration, call time, caller ID, and call location

• Examples of telecom sources include mobile network operators, landline service pr...read more

UNIX commands are essential for navigating and managing files in a UNIX-like operating system.

• ls: Lists files and directories in the current directory. Example: 'ls -l' for detailed listing.

• cd: Changes the current directory. Example: 'cd /home/user' to navigate to the user's home directory.

• cp: Copies files or directories. Example: 'cp file.txt /backup/' to copy 'file.txt' to the 'backup' directory.

• mv: Moves or renames ...read more

Deep SQL knowledge involves understanding complex queries, optimization, and database design principles.

• Understanding of JOIN operations: INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN.

• Proficient in writing subqueries and using Common Table Expressions (CTEs) for better readability.

• Knowledge of indexing strategies to optimize query performance, e.g., using B-trees or hash indexes.

• Ability to write complex aggreg...read more

Understanding Java error troubleshooting is essential for product engineers to ensure smooth application performance.

• Check the stack trace for error details. Example: NullPointerException indicates an attempt to use an object reference that is null.

• Verify the code logic. Example: Ensure that all variables are initialized before use to avoid runtime exceptions.

• Look for syntax errors. Example: Missing semicolons or misma...read more