Portfolio / 2026
Gabriel
Anhaia
Software engineer, author, and open-source enthusiast. Building scalable systems and sharing knowledge for over a decade.
About
A bit about my background and what drives me.
Software engineer, author, and open-source enthusiast based in Berlin, Germany — originally from Brazil. I work across backend systems, distributed architectures, and increasingly with AI. Currently building things at Monta and writing at Dev Warlocks.
Writing is how I think. Whether it's a book, an article, or a well-structured codebase — I believe the act of putting ideas into words is the best way to truly understand them. That's why I've written four books so far, and I don't plan to stop. From PHP design patterns to Go concurrency, from navigating a tech career in Europe to rethinking how we learn in the age of AI — each book started as a curiosity I couldn't let go of.
Beyond writing, I care about clean architecture, developer education, and shipping things that matter. My open-source work on design patterns has reached over 300 stars on GitHub, and I'm always building something new — whether it's an AI-native IDE or an interactive learning platform.
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Years Experience
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Books Published
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GitHub Stars
Currently
Experience
Where I've worked and what I've built.
2022 — Present
Berlin, Germany
Senior Software Engineer
MontaCurrentBuilding scalable backend systems and distributed architectures for the EV charging platform. Working with microservices, cloud-native infrastructure, and cross-team engineering initiatives.
2020 — Present
Remote
Founder & Author
Dev WarlocksCurrentWriting about software architecture, backend engineering, and developer education. Published four books and built educational platforms like Neural Playground.
2014 — 2022
Brazil & Europe
Software Engineer
Previous RolesBuilt and maintained high-traffic backend systems across e-commerce, fintech, and SaaS industries. Progressed from junior developer to senior engineer and technical leader over 8 years.
2010 — 2014
Brazil
Electronics Technician
Aviation & ElectronicsBefore software, I worked with electronics — including maintenance and repair of avionics systems in airplanes and helicopters. A hands-on foundation that shaped how I think about systems and reliability.
Somewhere around the world
Expertise
The technologies and practices I work with daily.
Backend
PHP/Go/Node.js/Python/REST APIs/GraphQL
Frameworks
Laravel/Symfony/React/Next.js/Tauri
DevOps & Cloud
Docker/Kubernetes/AWS/CI/CD/Terraform/GitHub Actions
Data & Messaging
PostgreSQL/MySQL/Redis/MongoDB/RabbitMQ/Kafka
Architecture
Microservices/Design Patterns/DDD/Clean Architecture/SOLID/Event Sourcing/Circuit Breaker
AI & Observability
AI Agents/LLM Integrations/PostHog/Langfuse/MatraAI/Rust/TypeScript
Selected Work
Open-source projects and tools I've built and maintain.
Publications
Books I've written on software engineering, knowledge management, and career development.
Amazon
ENHexagonal Architecture in Go
Ports, adapters, and services that last. 22 chapters teaching hexagonal architecture the Go way — with implicit interfaces, plain constructors, and zero frameworks.
Casa do Código
PortuguêsDesign Patterns com PHP 7
A practical guide to implementing creational, structural, and behavioral design patterns in PHP. Covers best practices, real problems, diagrams, and practical applications.
View on Casa do Código
Amazon
ENObservability for LLM Applications
The production handbook for backend and platform engineers shipping LLM features. Covers OpenTelemetry GenAI semantic conventions, the 2026 tool landscape (Langfuse, LangSmith, Arize Phoenix, Braintrust), evals as a first-class observability signal, cost tracking, drift detection, and incident response.
View on Amazon
Amazon
ENAgents in Production
How to build, trace, evaluate, guard, deploy, and recover LLM agents in production. Covers LangGraph, OpenAI Agents SDK, Anthropic Claude Agent SDK, CrewAI, Microsoft agent-framework, Meta's Agents Rule of Two, and the full agent operations stack.
View on Amazon
Amazon
ENDeep Focus
The prerequisite the other four books assumed you had. Every technique in the Actually Learn series requires sustained attention — the one resource getting scarcer, not cheaper. This book shows you how to build a practice that protects your focus in a world designed to steal it.
Coming Soon
What People Say
Words from colleagues I've had the pleasure of working with.
“Gabriel was a great professional to work with. When you need help with PHP and design patterns he is the guy to go to. He is very creative, hands-on, organized, and is always open to discuss ideas and suggestions. His energy to make things happen was contagious and it helped us achieve great goals.”
“Gabriel is very talented and has a great knowledge of software best practices, always suggesting solutions that made us able to solve user problems and not lose in performance. He was one of the most available colleagues to talk about product, tests and agile methods ideas, which I consider is a huge differentiator in a software engineer.”
Journal
Recent releases, publications, and milestones.
Published "Do Brasil para Berlim"
Released a 251-page guide for Brazilian developers wanting to work in Europe. Available on Amazon and Kindle Unlimited in both Portuguese and English.
Published "Zettelkasten: How to Actually Learn in the Age of AI"
A 217-page book on the Zettelkasten method adapted for the AI era. Learn to build a note-taking system for lasting understanding.
Hermes IDE Goes Open Source
Made Hermes IDE fully open source — an AI-native terminal emulator with ghost-text completions, autonomous task execution, and full git management.
Launched Hermes IDE
Released Hermes IDE, an AI-powered shell built with Tauri, React, and Rust. Features multi-session management, git panel, and support for Claude, Gemini, Aider, and Codex.
Neural Playground Launched
Shipped Neural Playground — an interactive platform for learning AI concepts through play and hands-on simulations.
Published "The Complete Guide to Go Programming"
Released a hands-on book covering Go fundamentals, concurrency patterns, and building complex production-grade systems.
php-design-patterns Hits 300 Stars
The PHP design patterns repository crossed 300 GitHub stars, becoming a widely-used reference for PHP developers learning design patterns.
Let's Connect
Interested in working together, discussing ideas, or just want to say hello?
Blog
Dev Warlocksdev.toArticles on software architecture, backend engineering, and lessons learned building systems at scale.
