How I Landed a SF Express Tech Offer with a Salary Above My Expectation

I'm Xiao Meng, a programmer, and I'm sharing a recent success story: after three months of preparation, a friend received an offer from SF Express Technology. The base salary is 20k multiplied by 15 months, which exceeds the original expectation of 15k.

First‑round interview questions

How to optimize SQL queries? List all methods you know.

Describe the Redis scenarios you have used.

What are the implementation methods for distributed sessions?

Which Spring Cloud components are you familiar with? Explain them in detail.

How does Nginx achieve fault tolerance?

What are the advantages of Elasticsearch and what is an inverted index?

How to ensure cache and database consistency?

Discuss MySQL transactions.

Explain your understanding of garbage collection.

What is a Redis cache avalanche and how to solve it?

How to solve cross‑origin issues in Spring Boot?

Difference between interceptors and filters in Spring Boot.

Any open‑source projects or technical books you like?

Second‑round interview questions

Do you know cache breakdown in Redis? Causes and solutions?

What clustering method does Redis use? How to perform dynamic scaling and what is the principle?

How to implement rate limiting? At which layer can it be applied and what algorithms are available?

Do you know distributed transactions? What solutions exist and which one does your company use?

Have you used sharding (database/table splitting)? How to apply it?

What is the maximum data volume your system has handled?

Explain the principle of RPC.

Do you understand the underlying implementation of HashMap?

In MySQL, how to ensure data integrity and consistency?

If dealing with tens of millions of records, how would you query them?

Have you used AI tools? What is your view on AI?

Technical interview concluded.

The friend answered about 85% of these questions correctly and received the offer one week later. Wishing everyone many offers in 2026.