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Sharing my experiences, learnings, and adventures in tech and beyond.

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DevOps & Cloud Infrastructure (193)AI & LLMs (143)Backend & APIs (102)Web Development (90)ERP Systems (77)Security (65)Software Development (58)Career Reflections (29)Cloud (29)AI / Machine Learning (18)Product & SaaS (12)University (1)Hackathons (1)

DevOpsOctober 202612 min read

SLI vs SLO vs SLA: Definitions, Error Budgets and Burn Rates

What SLI, SLO and SLA mean, why an SLO sits below 100%, how to compute an error budget, set burn-rate alerts and measure it all in Prometheus.

BackendOctober 202611 min read

Sync vs Async Microservices Communication: How to Choose

When a service should call another and wait, and when it should publish a message instead: availability arithmetic, latency, failure handling, consistency, and the 202 Accepted hybrid.

CareerOctober 202612 min read

System Design Interview Framework: A Step-by-Step Approach

How to approach a system design interview step by step: requirements, scale estimates, API and data model, diagram, deep dive, trade-offs, with a worked pastebin example.

Software DevelopmentOctober 202612 min read

Back-of-the-Envelope Capacity Estimation: QPS to Servers

Go from daily active users to QPS, storage, bandwidth, cache size and server count, with a worked photo-sharing example and a TypeScript estimator.

BackendOctober 202610 min read

Database Partitioning vs Sharding: What Is the Difference?

Partitioning splits a table inside one database server, sharding spreads data across several servers. Postgres DDL, EXPLAIN output and a shard router.

Software DevelopmentOctober 202611 min read

Hexagonal Architecture (Ports and Adapters) in TypeScript

What hexagonal architecture is, how ports and adapters keep business logic free of frameworks and databases, and a NestJS and Postgres example you can copy.

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