JB

Jeffree Berrocal Sequeira Jr.

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.

About

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.

  • 5 years' experience
  • Joined April 2026

Languages

  • Spanish; CastilianFluent
  • EnglishAdvanced

Industry experience

  • Software & Internet
  • Computers & Electronics
  • Professional Services
  • Media & Entertainment

More experts

Work experience

Freelance Full Stack DeveloperJan 2025 – Present · 1 yr 11 mos

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.

Customer Service Specialist · Fitness For OneJan 2024 – Dec 2024 · 1 yr

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%.

Operations Manager · Mr. Outlet Costa RicaJan 2021 – Dec 2023 · 3 yrs

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.

Education

Bachelor's in Engineering (In Progress) · Universidad Católica de Costa Rica2024 – 2026
Bachelor's in Business Administration · Universidad Católica de Costa Rica2016 – 2021

Certifications and awards

Python Expert2026
Project Management & Scrum Master2025

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