Sebastian Quintana
Software Engineer / Backend Developer
About
Backend Developer with 2 years of experience designing and building scalable systems using Java (Spring Boot), Python (Django, Flask), and RESTful APIs. Skilled in relational and non-relational databases (MySQL and MongoDB). Focused on performance optimization, secure API design, and robust business logic. Familiar with clean architectures, SOLID principles, and automated testing. Experience applying agile methodologies like Scrum.
Skills & Expertise (16)
Work Experience
Web Developer
J Create
January-2024 - January-2025
Designed and launched the corporate website using HTML5, CSS3, JavaScript, and Bootstrap (~v5). Led the rebranding process and developed visual assets to strengthen brand identity. Built and optimized the MySQL database structure, reducing query times by 40%. Developed a custom CRM to improve internal workflows and increase user retention.
Full Stack Developer (Internship)
UColtis
August-2022 - July-2023
Built scalable applications using Java 11 (Spring Boot), Python (Django, Flask). Integrated REST APIs and developed business logic for internal tools. Managed relational and non-relational databases (MySQL and MongoDB). Participated in the creation of a digital library, connecting backend and frontend for a seamless UX. Performed unit and integration testing to ensure system quality.
Full Stack Developer
UColtis
8-2022 - 7-2023
UColtis is an EdTech company focused on delivering live programming education and hands-on development experience. Responsibilities: ● Built scalable applications using Java 11 (Spring Boot) , Python (Django, Flask). ● Integrated REST APIs and developed business logic for internal tools. ● Managed relational and non-relational databases (MySQL and MongoDB). ● Participated in the creation of a digital library, connecting backend and frontend for a seamless UX. ● Performed unit and integration testing to ensure system quality.
Software Developer
J-Create
1-2024 - 1-2025
J Create is a global leader in metal manufacturing and architectural design, with operations in Japan, Vietnam, and China. Responsibilities: ● Designed and launched the corporate website using HTML5, CSS3, JavaScript, and Bootstrap (~v5). ● Led the rebranding process and developed visual assets to strengthen brand identity. ● Built and optimized the MySQL database structure, reducing query times by 40%. ● Developed a custom CRM to improve internal workflows and increase user retention.
Education
MinTic Program – Software Development & Programming Fundamentals
March 2022 - December 2022 · Colombia
BSc. in Systems Engineering (In Progress)
July 2023 - July 2027 · Colombia
Occupational Health and Safety Administration
January 2012 - September 2016 · Colombia
English Studies – Full Immersion
April 2018 - December 2019 · Australia
Certifications
Java Developer Training
UColtis · 2023
N/A
Web Development with Python (Django, Flask)
UColtis · 2022
Over 800 hours of intensive training and project-based learning.
Misión TIC Full Stack Track
The Technological University of Pereira - UTP · 2022
Selected from over 50,000+ applicants to join Full Stack track.
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Profile Score Breakdown
Profile Overview
Availability Details
Visa Status
No Visa
Relocation
Not Open to Relocation
