JeffSkynird - Overview

Hi, I’m Jefferson Leon 👋

Software Engineer · Developer · Solutions Architect / Ecuador · Spanish (native) · English (B2+)

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

🌐 Portfolio

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

✍️ Blog & Writing

jeffersonleon — I write about software architecture, distributed systems, and cloud-native development.

🚀 About me

👨‍💻 Experience: 9 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
🤝 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.

Repo: https://github.com/JeffSkynird/architecture-labs

📌 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
abac-platform — End-to-end authorization platform for fine-grained access control using the Cedar policy language. This monorepo includes a high-performance Rust PDP, a NestJS Admin API, and an Astro/React dashboard for managing policies, tenants, and entities, with Envoy ext_authz integration.

NestJS · Astro · React · NodeJS · Rust · Cedar · Envoy · Keycloak
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.

NestJS · TypeScript · FFmpeg · MinIO · RabbitMQ · Meilisearch · ClickHouse · Nginx
secure-llm-gateway — Provider‑agnostic gateway with quotas, rate limiting, SSE, and privacy controls.

Rust · Axum · Redis · OpenTelemetry
port-warden — Cross‑platform tray app to manage dev ports & Docker; smart kill, profiles, CPU/RAM alerts.

Rust · CLI/Tray · sysinfo · bollard

Repos:

💼 Experience

Alegra — Software Engineer (12/2024–11/2025) Built and maintained backend services for financial systems in PHP/Laravel and Node.js; led a gradual migration toward Node.js microservices to improve scalability and performance. Implemented event-driven communication using Kafka and AWS SNS/SQS; developed serverless workloads with AWS Lambda; optimized persistence on Aurora and DynamoDB applying DDD and hexagonal architecture.

Node.js · PHP · Laravel · Kafka · AWS Lambda · SQS · SNS · S3 · Aurora · DynamoDB · Docker · DDD · Hexagonal Architecture
Telconet — Software Engineer (12/2021–11/2024) Designed and implemented microservices with Spring Boot and Laravel, focused on scalability and domain separation. Integrated asynchronous communication via Kafka; developed enterprise web interfaces with React.js; containerized and deployed services with Docker and Docker Swarm; modeled and optimized data in PostgreSQL and Oracle; collaborated in Agile/Scrum with Git and CI/CD pipelines.

Spring Boot · Laravel · React.js · Kafka · Docker · Docker Swarm · PostgreSQL · Oracle · Git · CI/CD · Scrum
Ambiensa — Software Engineer (01/2020–11/2021) Developed an administrative CRM (React + Laravel) for lead/customer management, visits tracking, and document uploads. Integrated AWS Textract for document data extraction and scoring; built React Native mobile apps for customers (lead capture, file uploads, process traceability) and internal teams (technician/visit tracking). Implemented a React-based payments web app integrating the Pagomedios API; used Docker to streamline development and deployments.

Laravel · React.js · React Native · AWS Textract · Payments API · Docker · CRM · Lead Management