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I'm a results-driven Full Stack Developer specializing in Python, JavaScript, and React-based web applications, with a track record of building scalable, maintainable, and high-performance systems. I design RESTful APIs, integrate third-party services, and manage SQL and NoSQL databases across real-world production environments. I bring a business-minded approach to engineering decisions to drive lasting product impact and long-term sustainability.…I'm a results-driven Full Stack Developer specializing in Python, JavaScript, and React-based web applications, with a track record of building scalable, maintainable, and high-performance systems. I design RESTful APIs, integrate third-party services, and manage SQL and NoSQL databases across real-world production environments. I bring a business-minded approach to engineering decisions to drive lasting product impact and long-term sustainability.

Jeffree Berrocal Sequeira Jr.

Full Stack Developer, Web Developer, Front-End Developer, +2

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I'm a results-driven Full Stack Developer specializing in Python, JavaScript, and React-based web applications, with a track record of building scalable, maintainable, and high-performance systems. I design RESTful APIs, integrate third-party services, and manage SQL and NoSQL databases across real-world production environments. I bring a business-minded approach to engineering decisions to drive lasting product impact and long-term sustainability.…I'm a results-driven Full Stack Developer specializing in Python, JavaScript, and React-based web applications, with a track record of building scalable, maintainable, and high-performance systems. I design RESTful APIs, integrate third-party services, and manage SQL and NoSQL databases across real-world production environments. I bring a business-minded approach to engineering decisions to drive lasting product impact and long-term sustainability.

Available to hire

I’m a results-driven Full Stack Developer specializing in Python, JavaScript, and React-based web applications, with a track record of building scalable, maintainable, and high-performance systems.

I design RESTful APIs, integrate third-party services, and manage SQL and NoSQL databases across real-world production environments. I bring a business-minded approach to engineering decisions to drive lasting product impact and long-term sustainability.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

Spanish; Castilian

Fluent

English

Advanced

Work Experience

Freelance Full Stack Developer

January 1, 2025 - Present

Developed and deployed multi-role SaaS web applications for local businesses using React, Firebase, JavaScript, and Python/Flask. Built end-to-end platforms with role-based dashboards, push notifications, and automated reporting, reducing manual workload by over 60% for clients. Executed third-party API integrations and cloud functions to extend platform capabilities in production environments. Designed business-oriented solutions focused on solving operational problems and improving performance and quality of results.

Operations Manager at Mr. Outlet Costa Rica

January 1, 2021 - December 1, 2023

Managed a 10-person team and applied digital inventory systems that improved stock accuracy by 40% across 5,000+ SKUs. Drove monthly sales up to $90K through process optimization and team leadership. Led digital transformation of internal workflows, reducing manual errors and improving traceability across all departments.

Customer Service Specialist at Fitness For One

January 1, 2024 - December 1, 2024

Delivered high-quality client support and digital onboarding for 70+ customers daily, maintaining a satisfaction rate above 95%. Collaborated with technical teams to streamline member data processes, cutting onboarding time by 25%.