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Real Production Systems · Production Metrics

Verifiable Engineering: Architecture, Metrics & Production Code

Zero vanity metrics. Every case study breaks down real operational problems, systems architecture, code-verified data points, and technical lessons learned in production.

Executive Summary · Technical Profile

Pablo Fesa · Software Architect & Tech Lead

10+ years of software engineering taking full ownership of what the industry demands from a senior backend engineer: robust API design with idempotent contracts, relational and NoSQL data modeling with index profiling, decoupled asynchronous processing (RabbitMQ, Redis), in-memory acceleration (OPcache, Memcached), proactive observability (structured logging, APM, and metrics), security by design (OWASP, SSDLC guidelines, Zero Trust), and automated delivery through continuous test suites and CI/CD pipelines across cloud and bare-metal environments.

APIs & Contracts REST · Webhooks · Idempotency
Databases & Storage SQL / NoSQL · Indexes · ACID
Queues & Processing RabbitMQ · Redis · DLQ
Cache & Latency OPcache · Memcached · Redis
Observability Structured Logs · APM · Metrics
Security (AppSec) OWASP · SSDLC · Zero Trust
Testing & CI/CD Automated Tests · Pipelines
Infra & Operations Linux Hardening · Docker · Proxmox
Deep Dive Architecture

Engineering Notes & Systems Design

Technical trade-offs, performance benchmarks, and real production lessons straight from the codebase.