Santiago Pelaez
@santiagopelaez
Backend and mobile developer specializing in Java/Spring Boot and Kotlin/Flutter, delivering scalable systems and AI-enabled automation.
What I'm looking for
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%.
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%.
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.
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.
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.
Education
Degrees, certifications, and relevant coursework
Universidad de Medellín
Systems Engineering, Systems Engineering
2025 -
Studying Systems Engineering at Universidad de Medellín beginning March 2025.
Universidad de Medellín
Certification, Relational Databases (DBMS SQL)
2020 - 2020
Completed Introduction to Relational Databases with DBMS SQL in 2020.
Availability
Location
Authorized to work in
Job categories
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