Open to opportunities

SAMUEL ANDRES CASTAÑO MONTES

@samuelandrescastaomo

Message

Backend Lead building secure Spring Boot and real-time full-stack platforms.

Zimbabwe

Message

What I'm looking for

I’m looking for a role where I can lead backend work in Java/Spring, build secure auth and payment flows, and ship real-time features with observability on AWS.

I’m a Backend Lead delivering production-ready systems with Java and Spring Boot, while owning secure auth, payments, and real-time communication patterns end to end.

At SmartRestaurant (2025–Present), I lead full-stack + backend delivery for a platform that manages orders, payments, and inventory across four roles. I built an auth stack with JWT plus email 2FA and Google OAuth2, including account recovery and unlock flows.

I integrated the Wompi payment gateway for online orders and in-person POS, and added real-time communication using WebSockets and SSE. On AWS EC2, I run Nginx as a reverse proxy with HTTPS (Certbot) and expose metrics through Spring Actuator + Micrometer to Grafana and Prometheus.

Earlier, at AdvanzedProyect (2024), I built REST APIs with Spring Boot 3 and Java 21, implemented role-based access control using Spring Security and Angular route guards, and created token refresh flows. I also designed a layered Oracle DB backend for Mechanical-Work-Shop (2024), and developed an ML sentiment analysis project using Python, TF-IDF, and Scikit-learn.

Experience

Work history, roles, and key accomplishments

Current

Backend Lead

Current

SmartRestaurant

Jan 2025 - Present (1 year 4 months)

Built a production platform with admin, waiter, kitchen, and customer roles to manage orders, payments, and inventory. Implemented JWT + email 2FA + Google OAuth2 auth, integrated Wompi payments, and delivered real-time updates via WebSockets and SSE.

Java Spring Boot Spring Security JWT OAUTH2 WebSockets Server Sent Events (SSE)PostgreSQL AWS EC2 Docker

Backend Developer

Mechanical-Work-Shop

Jan 2024 - Present (2 years 4 months)

Designed a relational data model and optimized Oracle DB queries using stored procedures in a layered repository-service-controller architecture. Built backend functionality in Java with Gradle and strict separation of concerns.

Java Oracle Database Stored Procedures SQL Query Optimization Gradle

Full Stack Developer

AdvanzedProyect

Jan 2024 - Present (2 years 4 months)

Developed a REST API using Spring Boot 3 and Java 21 with role-based access control via Spring Security and Angular route guards. Implemented transactional email notifications and token refresh flows for secure user access.