Who was responsible for the verification services (anti-fraud, image checking, text, spam, limits)?

The question concerns experience with verification services such as anti-fraud, image, text, spam, and limit checks.

These services are usually implemented as separate microservices or modules that process incoming data and make decisions based on rules, machine learning models, or heuristics. For example:

• Anti-fraud — analyzes transactions and user behavior to detect fraud.
• Image verification — may include content recognition, filtering unwanted content.
• Text and spam verification — filters messages, comments for spam, insults, or prohibited content.
• Limits — controls request or operation frequency to prevent abuse.

If you have worked with such services, you likely have experience with:

• Building and integrating APIs for interaction with other systems.
• Developing verification and filtering algorithms.
• Optimizing performance and scalability.
• Ensuring reliability and monitoring of services.

An example in Go for simple request limit checking:

package main

import (
    "fmt"
    "sync"
    "time"
)

// Simple structure for request limit
 type RateLimiter struct {
    mu        sync.Mutex
    requests  int
    max       int
    resetTime time.Time
}

func NewRateLimiter(max int, interval time.Duration) *RateLimiter {
    return &RateLimiter{max: max, resetTime: time.Now().Add(interval)}
}

func (r *RateLimiter) Allow() bool {
    r.mu.Lock()
    defer r.mu.Unlock()

    now := time.Now()
    if now.After(r.resetTime) {
        r.requests = 0
        r.resetTime = now.Add(time.Minute)
    }

    if r.requests < r.max {
        r.requests++
        return true
    }
    return false
}

func main() {
    limiter := NewRateLimiter(5, time.Minute)

    for i := 0; i < 10; i++ {
        if limiter.Allow() {
            fmt.Println("Request allowed")
        } else {
            fmt.Println("Request limit exceeded")
        }
    }
}

This approach can be expanded and integrated into more complex verification services.