Open to opportunities

Santiago Pelaez

@santiagopelaez

Backend and mobile developer specializing in Java/Spring Boot and Kotlin/Flutter, delivering scalable systems and AI-enabled automation.

Colombia

Message

What I'm looking for

I’m looking for a role where I can build Java/Spring Boot backend services, optimize REST APIs, and integrate AI-assisted automation with strong code quality and human oversight in an agile team.

I’m a software engineer focused on backend development with Java and Spring Boot, backed by hands-on experience building scalable systems and optimizing APIs end to end. I integrate AI-assisted workflows into real projects to enhance productivity, automate processes, and support data-driven decisions—without sacrificing engineering judgment or code quality.

In recent work, I engineered backend services for financial operations and migrated workflow automation from n8n to Java/Python microservices, reducing failures by 30%. I also optimized REST APIs to improve response times by up to 20%, while designing robust integrations and performance improvements across mobile and web products, including offline-first mobile architecture and query-level database tuning (improving performance by up to 40%).

Experience

Work history, roles, and key accomplishments

FullStack Developer

LendFlow

Sep 2025 - Dec 2025 (3 months)

Engineered and maintained backend services supporting financial operations. Migrated workflow automation from n8n to Java/Python microservices and reduced failures by 30%, while optimizing REST APIs to improve response times by up to 20%.

Java Python Microservices REST APIs Workflow Automation N8n Backend Services

Full-Stack Developer

Sigag S.A.S

Jan 2025 - Sep 2025 (8 months)

Maintained and improved a business management system by developing new modules to reduce manual workload. Optimized SQLite queries to improve performance by 40%.

Java SQLite REST APIs Backend Development Query Optimization Performance Tuning & Business Systems

Junior Mobile Developer

Sigag S.A.S

Jan 2024 - Jan 2025 (1 year)

Led end-to-end mobile app development, integrating REST APIs and real-time communication. Implemented an offline-first architecture with SQLite and improved performance using Kotlin Coroutines.

Kotlin SQLite REST APIs Real Time Communications Coroutines Retrofit Mobile App Development

Developer

D&H Pallets

Feb 2023 - Oct 2023 (8 months)

Developed a landing page and backend services using Spring Boot. Built features with React/NextJS and PostgreSQL to support the application.

React React NextJS Java Spring Boot PostgreSQL Backend Development REST APIs Web Development

Freelance Developer

Freelance Projects

Developed freelance web and mobile projects, including a responsive WordPress business website and a Flutter streaming mobile app with scalable architecture and API integration.

WordPress Elementor Astra Theme Responsive Design Flutter API Integration Scalability