Tell me about the last big task or project you worked on.

In my last major project, I was involved in developing a high-load microservice in Go for processing streaming data in real-time.

Main tasks:

• Receiving and parsing messages from Kafka.
• Data validation and enrichment.
• Asynchronous writing to a database (PostgreSQL).
• Ensuring high performance and fault tolerance.

During the work, I:

• Designed the architecture using goroutines and channels for efficient processing.
• Implemented a worker pool for parallel message processing.
• Set up monitoring and logging with Prometheus and Grafana.
• Optimized database queries to minimize delays.

An example of simplified message processing code:

func worker(messages <-chan Message, wg *sync.WaitGroup) {
    defer wg.Done()
    for msg := range messages {
        data := parse(msg)
        enriched := enrich(data)
        saveToDB(enriched)
    }
}

func main() {
    messages := make(chan Message, 100)
    var wg sync.WaitGroup

    for i := 0; i < 5; i++ {
        wg.Add(1)
        go worker(messages, &wg)
    }

    // Code for reading from Kafka and sending to messages

    close(messages)
    wg.Wait()
}

This project allowed me to deepen my knowledge in concurrent programming in Go and working with data streams.