Oracle Software Engineer Interview Questions

I would combine a hash map with an array or list so I can find items quickly and also pick a random element efficiently. Then I would handle deletions by swapping with the last element when needed. This is a common design question because it tests both algorithmic thinking and implementation detail.

I would encode the movement rules for the specific piece and check whether the destination fits those rules. Then I would include board boundaries and any blocking conditions that matter for the piece. A good answer shows careful rule handling instead of rushing into code.

I would prepare for sudden spikes with queueing, throttling, and horizontal scaling. Then I would make sure inventory, ordering, and fairness are handled consistently so the system does not oversell or fail unpredictably. Flash sale systems are mainly about protecting the core transaction path.

I would design for failure by isolating components, duplicating critical data, and ensuring the system can recover quickly. Then I would verify that the failure of one part does not cascade across the whole platform. A strong answer shows resilience as an engineering habit.

I would keep service boundaries clear and avoid letting one service directly control another service’s data model. Then I would use APIs, events, or replication patterns that fit the consistency needs of the product. Good integration keeps services independent while still allowing them to work together.