Senior Backend Engineering Patterns

This repository acts as an entry point to a set of production-ready backend patterns I frequently use when building Node.js microservices.

The actual implementations live as GitHub Gists to keep each concept focused, reviewable, and easy to discuss.

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📌 Core Patterns

1️⃣ Idempotent APIs

Ensuring the same request does not produce duplicated side effects.

🔗 https://gist.github.com/mostafasayed/155137f22e6244725077a820d5886b6a

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2️⃣ Retry with Exponential Backoff

Handling transient failures without overloading dependencies.

🔗 https://gist.github.com/mostafasayed/bdde10e078e0be7e7decae1f9c81badc

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3️⃣ Circuit Breaker

Preventing cascading failures when dependencies are unhealthy.

🔗 https://gist.github.com/mostafasayed/46eb26d8ca2ad93981fbf2a5328805c5

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4️⃣ Observability with Correlation IDs (NestJS)

Tracing requests across services.

🔗 https://gist.github.com/mostafasayed/3e5fc7ae88afd654e4822dde7036b667

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5️⃣ Transactions with TypeORM

Ensuring atomic operations using QueryRunner.

🔗 https://gist.github.com/mostafasayed/c56bc106fe4cc4ed6c8dece497e7d3f6

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6️⃣ Transactions with Prisma

Clean transaction boundaries using $transaction.

🔗 https://gist.github.com/mostafasayed/983e0a4fb96d2c25b4007f18b8695213

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Why Gists?

• One concept per file
• Clean version history
• Easy to reference in interviews and discussions

This repo is intentionally minimal and acts as a navigation layer.