I am a CTO, Web3 Architect, and 3D Systems Engineer with 6+ years of experience building and delivering production systems globally (Switzerland, USA, Portugal, Brazil). My core work focuses on secure cryptography setups, blockchain protocols, scalable backends, and 3D/WebGL engines.

I write clean, low-level code, manage dev teams, and handle the entire product lifecycle—from initial MVP development to final production-grade releases.

I also work with teams as a technical advisor and consultant on specific complex domains:

• Blockchain & Cryptography: Security audits, wallet keychain design (BIP39/BIP44), Argon2id/AES-256-GCM configurations, and EVM/Waves smart contract auditing.
• Systems Architecture: High-throughput backends, spatial/PostGIS data engines, containerized cloud infrastructure (AWS/GCP), and hardware-accelerated 3D WebGL layouts.
• Developer Mentorship: Setting up secure coding standards, automated testing pipelines (Foundry/Hardhat), and modernizing engineering practices to ship products faster.

"Diego Antunes resolved in months what Silicon Valley senior developers failed to deliver for 8 years."

I was contracted directly by Brunet, the #1 Inventor of Brazil (honored by ANI - Associação Nacional dos Inventores), to salvage and build a highly complex, mission-critical proprietary connections platform.

• The Background: Prior to my involvement, the client had invested over R$ 4 Million on this initiative. He had contracted multiple specialized development firms and even senior software engineers directly from Silicon Valley. For 8 consecutive years, team after team failed to deliver a stable, working, and secure production platform.
• The Solution: I stepped in as the Lead Software Architect, re-engineered the core system from scratch, resolved the deep architectural bottlenecks, and successfully delivered the production-ready platform.
• ⚠️ Contractual Confidentiality (NDA): Due to strict legal confidentiality agreements, the low-level architecture, proprietary mechanics, and codebase of this connections engine cannot be disclosed publicly.
• 📞 Professional Reference: For institutional clients or strategic partners wishing to perform a professional reference check to verify the legitimacy and success of this project, you are highly encouraged to contact Brunet directly on Instagram (@brunet_inventor) to confirm my delivery.

Core Stack: React, Vite, TypeScript, Ethers.js, WebCrypto API, Argon2id KDF, AES-256-GCM.
Chains: EVM, Solana, UTXO, Tron, Waves, Stellar, Cardano, Polkadot, Monero, and Zcash.

• Cryptography & Security: Seed phrase protection using Argon2id KDF against GPU brute-force attacks, combined with authenticated AES-256-GCM block ciphers to encrypt the local state.
• Performance: Optimized lightweight UI loops, real-time transaction decoding, and custom responsive SVG metrics layout.
• Repository: View Codebase

I design high-performance interactive 3D simulations, real-time spatial cartography compilers, and custom game engines, targeting WebGL, desktop, and mobile environments.

• The Pipeline: Parses georeferenced land deed PDFs (SIGEF/INCRA) offline, resolves high-precision polygon closure constraints, performs ellipsoidal geodetic conversions (SIRGAS2000 UTM Projections), and compiles interactive 3D WebGL isometric models on-the-fly.
• Advanced Graphics: Renders detailed 3D terrain boundaries, height maps, and spatial meshes in the browser utilizing Three.js and WebGL, alongside AutoCAD-compliant DXF CAD layouts and QGIS-compliant GeoJSON schemas.
• DevOps: Built with strict GitHub Actions CI/CD and SLSA Level 3 Provenance for secure, signed NPM package delivery.

• The Architecture: Candy-crush style match game custom-built on a data-driven, strictly decoupled FSM (Finite State Machine) loop and global Event Bus to keep graphics rendering isolated from mathematical match resolution.
• Visual Juice & VFX: Implemented custom Shader Graph effects for high-end rendering transitions, procedural particle generators, DOTween custom animations, and an asset-streaming system utilizing Unity Addressables.
• Stack: Unity 2022 LTS, C#, Universal Render Pipeline (URP), Object Pooling, Seeded Deterministic RNG, Unity Ads/IAP/Analytics.

• The Project: Collaborated as the lead developer to create an interactive georeferenced virtual museum for the first archaeological park in Brazil (São João Marcos, Rio de Janeiro). Reconstructed the entire historical 18th-century town flooded in the 1940s into a high-fidelity interactive digital environment.
• The Engineering: Programmed the real-time 3D environments, spatial mapping coordinates, highly optimized WebGL/mobile layouts, georeferenced terrain meshes, and interactive building nodes. Enabled visitors to virtually walk through reconstructed ruins and historical landmarks with rich historical overlays.
• Stack: Unity 3D, C#, WebGL, Three.js, Custom Shaders, Georeferenced Terrain Meshes, Spatial Mapping.

• The Venture: Co-founded and built from the ground up as CTO, owning the complete technical roadmap.
• The Architecture: Unifies a high-converting public landing portal, a secure dedicated Client Area (User Portal) for case tracking, and a centralized administrative telemetry control panel.
• Automation: Built an automated conversational chatbot via the WhatsApp Business API that executes initial user triage and feeds structured data directly into backend systems.
• Stack: React + Vite, TypeScript, TailwindCSS, Firebase (Firestore Real-time Sync, Cloud Functions, Auth, FCM), Facebook Conversions API.

• The System: A compassionate virtual memorial and real-time ceremony streaming SaaS built for absolute data privacy and global performance.
• Regional Payment Gateways: Custom payment gateway routing using Mercado Pago for Brazil and Swiss TWINT for operations in Switzerland.
• Infrastructure: Engineered a NestJS backend deployed on containerized Google Cloud Run nodes, syncing via Redis caching and PostgreSQL ACID-compliant databases.
• Stack: Next.js, React, TypeScript, Node.js, NestJS, PostgreSQL, Redis, Google Cloud Run, Firebase Cloud Messaging (FCM), i18n (6 languages).

• The System: A complete service marketplace connecting verified local service professionals with users through one-tap bookings and real-time messaging.
• The Architecture: Combines responsive Next.js administrative dashboards and high-performance native iOS and Android applications compiled with Flutter.
• Geospatial Queries: Backed by NestJS on Google Cloud Run utilizing a PostgreSQL database with PostGIS for real-time spatial geolocation queries.
• Stack: Flutter, Next.js, React, TypeScript, NestJS, PostgreSQL, PostGIS, Google Cloud Run, Redis, Mercado Pago.

• The Venture: Served as Founding CTO (Equity Partner), designing and building the initial MVP from the ground up.
• The Architecture: Developed a proprietary blockchain core on top of the Waves network. Designed and programmed custom smart contracts in Ride, implemented atomic swap interoperability bridges to Ethereum, and engineered athlete image-rights tokenization mechanics.
• Integrations: Developed a custom mobile application interface, integrated Stripe, and built a custom payment gateway for direct fiat-to-token purchases. Pivoted the core system mechanics to comply with Brazilian CVM crowdfunding regulations.
• Stack: Waves Core Basis, Ride, React Native, TypeScript, Node.js, Stripe, CVM Compliance.

⚡ Primary Mastery & Favorites: JavaScript and Swift are my primary languages of choice, representing my deepest technical expertise across web, mobile, and secure system architectures.

• ⭐ JavaScript (ES6+ / V8 Engine Runtime): Architecting complex asynchronous loops, custom reactive event channels, high-performance Node.js service clusters, and real-time interactive browser render layers.
• ⭐ Swift (Modern Native iOS & Concurrency): Implementing high-performance native iOS systems, cryptographic hardware-backed storage (Secure Enclave, Keychain Services), and hardware-accelerated user interfaces.
• 🟦 TypeScript: Designing enterprise-grade strict type systems, compiler pipelines, abstract generic classes, and clean interface boundary patterns for massive multi-tenant SaaS products.
• ⚙️ Kotlin: Building native Android architectures utilizing modern coroutines for structured concurrency and Jetpack Compose for highly fluid reactive user interfaces.
• ☕ Java (JVM Platform): Developing highly scalable distributed transaction systems, multithreaded backend services, and robust object-oriented system architectures.
• 🎮 C# (Unity 3D/2D Game Loops): Programming state-of-the-art physics pipelines, custom shaders (HLSL/Shader Graph), georeferenced 3D projection mathematical transforms, and optimized asset streaming patterns.
• 🐘 PHP (Modern 8.x Ecosystem): Re-architecting legacy web infrastructures to modern decoupled cloud models, optimizing relational databases, and designing secure high-converting transactional pipelines.
• 🦀 Rust: Engineering memory-safe systems components, custom WebAssembly acceleration modules, high-efficiency low-level cryptography routines, and optimized developer tooling.
• 💾 COBOL (Mainframe Ledger Systems): Maintaining and optimizing high-compliance financial ledger programs, flat-file record parsers, and transactional architectures matching rigorous banking safety regulations.
• 🌙 Lua: Developing embedded high-performance scripts for performance-critical engines, real-time Redis transaction script sequences (EVAL), and extensible game mod environments.

Blockchain & Web3: Solidity, Smart Contracts (EVM), Hardhat, Foundry, Ethers.js, viem, Web3.js, Waves Core, Ride, BIP39/BIP44
3D & Spatial:      Unity 3D/2D (C#), WebGL, URP, Shader Graph, HLSL Shaders, Three.js, Proj4.js, QGIS, CAD (DXF)
Backend & Cloud:   NestJS, Node.js, Express, Go, Python, FastAPI, PostgreSQL, PostGIS, Redis, Cloud Run, AWS, Docker
Frontend & Mobile: Next.js 14, React, TypeScript, TailwindCSS, Vite, Redux, Zustand, Flutter, React Native, PWA

• b2-wallet: Refactored complete application event listeners; modularized app-events-modals.js and app-events-config.js (~3,700 lines optimized)
• b2-wallet: Created recursive codebase architecture markdown documentation under src/js/README.md
• pdf-to-maps: Optimized coordinates conversion algorithms utilizing geodetic projections (SIRGAS2000)
• b2-wallet: Added robust multi-wallet routing with bip39 keychain configuration
• click-servicos-app: Optimized PostGIS geolocation query parameters on Google Cloud Run NestJS backend

I partner with teams to architect secure Web3 protocols, high-performance backends, and interactive 3D/simulation environments.

• 🌐 Personal Portfolio: diegohorantunes.web.app
• 💬 WhatsApp: +55 (11) 97428-9097
• 📧 Direct Email: diegoantunes2301@gmail.com
• 🐦 X (Twitter): @diegoorisderoa
• 📸 Instagram: @diegooris
• 📝 Medium Articles: @diegoorisderoa