A Junior Perspective | Securepay
Securepay project is a basic simulation of how to create a reliable, scalable and maintainable system from my perspective. I decided to publish a blog about what I've learned from this project.
Read Full ArticleHIS v1.0: A Deep System Design Overview
A deep system design analysis of a production-grade, event-driven Hospital Information System. Covers the full microservices topology, schema isolation, Outbox Pattern, Dead Letter Queues, three-layer security, and the full observability stack.
Read Full ArticleStrategy Pattern
If you have ever worked on a billing system, you know the nightmare: every insurance provider has different rules. Some cover 80%, some have fixed discounts, and some cover nothing at all.
Read Full ArticleWhy gRPC over REST
If you have spent more than five minutes in microservices development, your default answer for service-to-service communication is probably REST. It is simple, human-readable, and Postman makes it look easy. But as my Hospital Information System (HIS) grew, I started asking: "Is 'easy to read' really more important than 'hard to break'?"
Read Full ArticleWhat is DLQ and How I Used It
Have you ever seen "Resilience" in any system design book? It's a shortcut to say "What happens to our system when things go wrong?" and it is a good question because I promise you, things will definitely go wrong.
Read Full ArticleWhat is Outbox Pattern and How I Used It
A deep dive into the Transactional Outbox Pattern. What it is, when to use it, and how I applied it in my Hospital Information System to guarantee reliable, atomic messaging between microservices without the Dual Write Problem.
Read Full ArticleP95 Latency Explained: What It Is and Why It Matters
Average latency is almost always a lie. P95 latency tells you a much more honest story. Learn what the 95th percentile means, why averages mislead you, and how to use percentile metrics to understand your system's real-world performance.
Read Full ArticleLessons from the Trenches: What I Learned Implementing SPIFFE/SPIRE in SecurePay
Zero-Trust isn't just a buzzword. Here's a brief explanation of what I've learned about workload identity, SPIFFE/SPIRE architecture, and handling mTLS at scale while building the SecurePay project.
Read Full ArticleEngineering SecurePay: A Deep Dive into Zero-Trust, Event-Driven Fintech Architecture
Pulling back the curtain on the architectural journey of building SecurePay, a high-performance, polyglot payment platform. Explore Zero-Trust security with SPIFFE/SPIRE, event-driven orchestration with Kafka, and cloud-native infrastructure on AWS.
Read Full ArticleCloudflare Tunnel: Secure Infrastructure Connectivity Without Public IP
Discover how Cloudflare Tunnel provides a secure way to connect your resources to Cloudflare without exposing public IP addresses. Learn about outbound-only connections, attack surface reduction, and why it's essential for modern infrastructure security.
Read Full ArticlePostgreSQL Internals: Understanding Database Architecture & MVCC
Deep dive into PostgreSQL's internal architecture covering PGDATA, database clusters, system catalogs, schemas, tablespaces, and the Postmaster process. Explore Multi-Version Concurrency Control (MVCC) with transaction IDs, isolation levels, and how PostgreSQL achieves high concurrency without blocking readers.
Read Full ArticleKubernetes Internals: Resource Management & Kernel Interaction
Deep dive into how Kubernetes translates YAML definitions into Linux kernel instructions. Explore the OOM killer mechanism, CPU throttling with CFS, scheduler filtering and scoring logic, and kubelet eviction policies. Learn what really happens under the hood when you set resource requests and limits.
Read Full ArticleKubernetes Resource Management: Hands-On Practice
Ready to get your hands dirty? This practical guide walks you through simple exercises to understand how resource requests and limits work in real scenarios. Learn by doing with 5 beginner-friendly exercises covering QoS classes, memory pressure, CPU throttling, and resource quotas.
Read Full ArticleAWS Well-Architected Framework
A comprehensive guide to AWS Well-Architected Framework covering all six pillars: Operational Excellence, Security, Reliability, Performance Efficiency, Cost Optimization, and Sustainability. Learn the essential design principles and best practices for building robust cloud solutions.
Read Full ArticleSelf maintenance and self care for engineers.
Have you ever felt that burnout is creeping in, and you're struggling to keep up with the demands of your engineering career? In this article, I explore the crucial distinction between self-maintenance and self-care, and how prioritizing both can lead to a healthier, more sustainable professional life.
Read Full ArticleBuilding a Microservices Architecture: My Patient Management Journey
The story behind designing and implementing a microservices-based patient management system using Spring Boot, PostgreSQL, Kafka and more.
Read Full ArticleBaby Steps About ...Ops
So, let me tell you my new experience about DataOps and what I have learned in a short time.
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