Most developers rely on cloud AI tools. I switched to running AI locally using Ollama.

Mehdi Hassan Jony — Thu, 16 Apr 2026 05:07:17 +0000

No API cost. No latency. No data exposure.

I use it daily for:

code generation
debugging
SQL queries
documentation

Full breakdown:
https://medium.com/@shoyshab/using-ollama-locally-how-it-changed-my-daily-development-workflow-9a07045dcd6c

Building a Scalable Backend Architecture with NestJS, Kafka, and PostgreSQL

Mehdi Hassan Jony — Wed, 15 Apr 2026 09:37:03 +0000

Most backend systems collapse under scale not because of traffic, but because of poor architectural decisions made early. Tight coupling, synchronous dependencies, and weak data strategies create bottlenecks that are expensive to fix later.

Problem

Typical backend issues at scale:

API latency increases under load
Services become tightly coupled
Failures cascade across the system
Database becomes a bottleneck

Architecture Overview

An event-driven microservices architecture:

API Gateway (NestJS)
Microservices (NestJS)
Kafka (message broker)
PostgreSQL (database)

Flow:

Client hits API Gateway
Event is produced
Kafka distributes it
Consumers process independently
Data persists

Why This Stack

NestJS

Modular architecture
Dependency injection
Scalable structure

Kafka

High-throughput messaging
Decouples services
Enables async workflows

PostgreSQL

Strong consistency
Reliable transactions
Powerful querying

Event-Driven Communication

Producer:

this.kafkaClient.emit('order_created', data);

Consumer:

@MessagePattern('order_created')
handle(data: any) {
  // process event
}

Key Strategies

Failure Handling

Retry with backoff
Dead Letter Queues

Idempotency

Track processed events
Prevent duplication

Scaling

Horizontal scaling for consumers
Read replicas for DB

Real-World Use Case

In systems like logistics or trading platforms:

Orders trigger multiple services
Payments, inventory, notifications run independently
Failures don’t block the system

Takeaways

Design async-first
Avoid tight coupling
Plan for failure
Scale consumers, not just APIs

Full Article

https://medium.com/@shoyshab/building-a-scalable-backend-architecture-with-nestjs-kafka-and-postgresql-ae938465b39b

DEV Community: Mehdi Hassan Jony