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JeffSkynird/README.md

Hi, I’m Jefferson Leon 👋

Software Engineer · Solutions Architect · Cloud & DevOps–minded Ecuador · Spanish (native) · English (B2+)

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I build reliable, scalable systems—from event‑driven backends and microservices to cloud‑first architectures on AWS. I enjoy turning complex problems into clean designs and production‑ready code.

🌐 Portfolio

personal-portfolio — showcase of highlighted projects and recent learning.

🚀 About me

  • 👨‍💻 Experience: 7+ years across fintech, telecom, and SaaS
  • 🏗️ Architecture: microservices, event-driven, hexagonal, DDD, SOA (with pragmatic trade-offs)
  • ☁️ Cloud: AWS (DynamoDB, S3, SQS/SNS, Lambda, Aurora, EC2/ECS)
  • 🧪 Quality: CI/CD, pipelines (GitLab/GitHub), code quality, observability
  • 🧠 Learning: preparing AWS Solutions Architect (in progress)
  • 🤝 Team: I value clarity, docs, feedback loops, and pragmatic delivery
  • 🧪 Fun fact: I love performance, optimization, and being a bit of a mad scientist with new tech ⚗️

🧩 Core strengths

  • Backend & APIs: Node.js/TypeScript, PHP/Laravel, Java/Spring Boot
  • Frontend & Mobile: React, Next.js, Angular, React Native
  • Data: PostgreSQL, Oracle, MySQL, DynamoDB; messaging with Kafka & gRPC/REST
  • Ops: Docker, Docker Swarm, Nginx, SonarQube, GitLab CI/CD
  • Patterns: idempotency, outbox/inbox, retries, circuit breakers, SAGA

🔧 Toolbelt

Languages: TypeScript · JavaScript · PHP · Java · SQL · Rust (learning)

Frameworks: Spring Boot · Laravel · React · Next.js · Angular

Infra/Cloud: AWS · Docker · Nginx · GitLab/GitHub Actions · Kafka

Databases: PostgreSQL · Oracle · MySQL · DynamoDB · Aurora

🏛️ Architecture labs

I document production-style architecture scenarios with C4 diagrams, ADRs, IaC blueprints, SLO dashboards, and performance/chaos drills. The repo links out to the reference apps; this space focuses on the documentation and diagrams.

📌 Featured projects

A selection of things I’m proud of. More in the pinned repos.

  • ddd-hexagonal-microservices — Microservices project with Laravel & React, using event-driven messaging (RabbitMQ) with DDD & Hexagonal patterns.

    Laravel · React · RabbitMQ · DDD · Hexagonal Architecture

  • cqrs-ordering-service — Order Service implementing CQRS + Event Sourcing with SQLite projections + DDD, Outbox dispatcher, Prometheus metrics (/metrics), k6 load tests, and Docker-friendly local setup.

    NestJS · TypeScript · CQRS · Event Sourcing · SQLite · Prometheus

  • hls-video-platform — HLS streaming with transcoding, search, analytics. TypeScript · FFmpeg · MinIO · RabbitMQ · Meilisearch · ClickHouse · Nginx

  • kavita-reader-rn — Open-source mobile reader for Kavita with OPDS browsing, downloads, reading progress sync, and offline support on Android/iOS. React Native · TypeScript · Kavita API · OPDS

  • port-warden — Cross‑platform tray app to manage dev ports & Docker; smart kill, profiles, CPU/RAM alerts. Rust · CLI/Tray · sysinfo · bollard

  • oxidoboy — Rust‑powered fantasy console; compile games to WASM and run in a tiny runtime. Rust · WASM · Winit · Pixels

  • secure-llm-gateway — Provider‑agnostic gateway with quotas, rate limiting, SSE, and privacy controls. Rust · Axum · Redis · OpenTelemetry

  • youtube-timestamp-notes — Chrome extension to take timestamped notes on videos and jump back. JavaScript · Chrome APIs

Repos:

💼 Experience (high‑level)

  • Alegra — Backend Engineer (2024–2025) PHP/Laravel → Node.js microservices migration; event-driven with Kafka/SNS/SQS; serverless with Lambda; data on Aurora & DynamoDB; DDD & hexagonal.

    Node.js · Laravel · Serverless · Kafka · ECS · EC2 · S3 · SQS · SNS · AWS Lambda · Aurora · DynamoDB

  • ConsulTI / Telconet — Full-stack (2021–2024) Angular + Spring Boot microservices; Docker/Swarm; Oracle & PostgreSQL; Kafka; Agile/SCRUM; CI/CD with Git & pipelines.

    Spring Boot · Angular · gRPC · Docker Swarm · Kafka · Oracle · PostgreSQL

  • Emtipay — Full-stack (2023–2024) Finance & pawn-based credit platform; React/React Native/Next.js + Node.js; PostgreSQL; payment integrations.

    React · Next.js · React Native · Node.js · PostgreSQL

  • Ambiensa — Full-stack Developer (2021) Defined enterprise architecture and modernization roadmap (CRM & sales flows): API-first decoupling, events for integrations, quality standards (versioning, contracts), security/governance, and stakeholder alignment.

    Architecture · APIs · React · Laravel · React Native · AWS Textract · EC2 · Performance Testing

  • Novosoft S.A — Full-stack Developer (2020–2021) React admin apps & React Native mobile apps for client management; Laravel backend with PostgreSQL; AWS infrastructure.

    React · React Native · Laravel · PostgreSQL · EC2 · S3

  • Austrosoft Cia. Ltda. — Full-stack Developer (2020) E-invoicing and accounting system using React for the frontend, Laravel for the backend, and a MySQL database.

    React · Laravel · MySQL · E-invoicing

  • Interbytes — Full-stack Developer (2017–2019) ISP client management system using React & Laravel; handled internet plans, router connections, and network traceability with PostgreSQL.

    React · Laravel · PostgreSQL · Networking

🎓 Education & Certifications

  • B.S. in Systems Engineering — Universidad Técnica de Machala (2013–2019)
  • SOA Professional & Microservices — Arcitura (2024)
    Credly
  • SOA Microservices Architect — Arcitura (2024)
    Credly
  • AWS Solutions Architect — in progress

🌱 Currently

  • Studying for AWS SAA
  • Diving deep into application performance, from algorithmic complexity (Big O Notation) to practical optimization tools.
  • Actively building projects with my core stack: React.js, Node.js, Laravel, and Cloud technologies.
  • Exploring Rust for performance tooling and safe systems programming.
  • Contributing to open source and polishing docs/READMEs

🤝 Let’s connect

  • 💬 Ask me about microservices, event‑driven design, AWS, or my core code stack
  • 📫 Reach me at [email protected] or on LinkedIn
  • 🧩 Actively seeking collaboration on innovative projects.

Pinned Loading

  1. event-driven-ddd-hexagonal-laravel-react event-driven-ddd-hexagonal-laravel-react Public

    Proyecto con arquitectura de microservicios usando Laravel (API backend) y React (frontend). Implementa RabbitMQ para mensajería, siguiendo principios de DDD y arquitectura Hexagonal para lograr es…

    PHP

  2. hls-video-platform hls-video-platform Public

    A simple video streaming platform with HLS transcoding, search, and playback analytics.

    TypeScript

  3. oxidoboy oxidoboy Public

    Rust-powered fantasy console inspired by the Game Boy. Write games in Rust, compile to WebAssembly, and run them in the OxidoBoy runtime.

    Rust

  4. port-warden port-warden Public

    Cross-platform tray app to manage dev ports: smart kill (SIGTERM→INT→KILL), profile groups, Docker-aware actions, local HTTP API, tail logs, and CPU/RAM alerts. Built with Rust.

    Rust

  5. youtube-timestamp-notes youtube-timestamp-notes Public

    Chrome extension to take timestamped notes on YouTube videos and jump back to them easily.

    JavaScript

  6. secure-llm-gateway secure-llm-gateway Public

    Secure, provider-agnostic LLM gateway in Rust — per-tenant Redis quotas, RPS/burst limiting, first-byte timeout, load-shedding, PII redaction, SSE streaming, Prometheus metrics, OTLP tracing

    Rust