Architecture

Transformer Architectures: 2017 → 2025+

From ‘Attention Is All You Need’ to modern mixture-of-experts and state-space hybrids: how the transformer family has evolved and what working engineers should know about the variants in production today.

Diagram of a RAG pipeline with ingestion, embedding, vector store, and LLM generation stages.

Architecting Production-Ready Retrieval-Augmented Generation Systems

How to build RAG systems that survive real production traffic: chunking strategies, hybrid retrieval, vector store selection, caching, and the operational patterns teams actually ship.

Abstract diagram showing payment service mesh with redundant nodes and encrypted transaction flows.

Architecting Resilient Payment Systems: Scalable Architecture Patterns and Security Best Practices

How to design payment systems that survive traffic spikes, partial outages, and adversarial pressure without losing a single cent. Patterns, trade-offs, and security primitives that actually ship.

Illustration of payment flow with idempotency key handling.

Implementing Idempotency Keys in Payment APIs: Architecture, Reliability, and Production-Ready Patterns

A deep dive into idempotency key strategies for payment services, with concrete architecture diagrams, code samples, and real‑world reliability patterns.

Illustration of TLS handshake with zero round‑trip resumption.

Implementing TLS 1.3 Zero Round-Trip Resumption: Architecture, Low-Latency Security, and Performance Patterns

A deep dive into TLS 1.3’s 0‑RTT resumption, showing how to design the handshake, integrate with Nginx and OpenSSL, and measure latency improvements.