1. Database (SQL, NoSQL)

1. Design (DDL).

2. Storage.

3. Query: Index

4. Locking: Concurency.

2. Caching

1. Design (DDL).

2. Storage.

3. Query: Index

4. Locking: Concurency.

3. Message Queue

1. Design (DDL).

2. Storage.

3. Query: Index

4. Locking: Concurency.

4. ElasticSearch

1. Design (DDL).

2. Storage.

3. Query: Index

4. Locking: Concurency.

5. Distributed Communication

1. API Gateway.

2. Distributed ID.

3. Distributed lock.

4. Distributed transaction.

5. ZooKeeper

6. Security Storage

1. Authenticate/Authorization.

2. Data Encryption.

7. Performance

1. CDN

2. Load Balancing.

3. Caching.

4. Message Queue.

5. Database optimization.

8. High availability

1. Circuit breaker.

2. Replication.

3. Timeout/Retry/Back pressure.