Domande di colloquio per Senior Software Engineer presso Dlocal

Golang Technical Questions General Concepts & System Design: what is a software pattern you have used recently? Explain Connection Pooling, Circuit Breaker, Timeouts, and Retries with Backoff. Databases: Experience with SQL vs. NoSQL. Define a Primary Key. Explain Master-Slave architecture AWS/DynamoDB: What types of keys does DynamoDB use? What is a partition key? Architecture & Patterns: How do you implement Idempotency and Rate Limiters? Team & VP Rounds: Deep dive into past experiences. Specifics on Observability, Rollout/Deployment strategies, and Incident Management. Discussion on team processes, ways of working, and personal motivation for joining dLocal.

Golang: - what is a pointer, operations on pointer (* and &) - what is a goroutine. - how to communicate between goroutines. - what is a channel. when is blocked, buffered vs non buffered. - what is an array. what is a slice, differences. - new() vs make() - what is an struct. can you add a method to a struct? difference method vs function - what is an error. how you handle errors in golang. General concepts: - Apart from Singleton, tell me a recent sofware pattern you have used. - connection pooling. - Circuit breaker. The states of the circuit. How to implement it? - Timeout, Retry with backoff. - CAP Theorem. - What SQL databases you know? and about NoSQL? - what is a primary key. - Idempotency, how would you implement it. - Rate limiter, how could you implement it. - Load balancer. - CQRS. - Messaging, Kafka. - DynamoDB. What types of keys. What is a partition key? - Strong consistency, eventual consistency. - Database master-slave. Can you use a slave/readonly replica for everything (no, because it has a replication lag).