Freelancer logo
Log In Sign Up
Post a Project

EXPLORE

HTML HTML5 JavaScript Python Web Scraping
Profile cover photo
User Avatar

Emmanuel V.

@emmanuelv0826

monthly-level-four.svg
5.0
3

2.1

2.1

100%

Senior AI & Full-Stack Engineer | Mobile (Flutter)

$30 USD / Hour

・

Flag of

Colombia (12:57 PM)

・

Joined on January 7, 2026

$30 USD / Hour

・

Senior Full-Stack Developer specializing in AI, Python, PHP, Node.js, Next.js, C#, TypeScript, React.js, Flutter, React Native, and iOS, with strong experience in Ecommerce platforms and custom solutions. I build scalable, production-ready web and mobile applications with clean architecture, high performance, and measurable business impact. Proven expertise in AI/LLM (OpenAI) integration, intelligent automation, and full lifecycle product development. Core Skill Set AI & LLM Integration (OpenAI) Ecommerce Systems & Payment Integrations Backend APIs & Microservices Full-Stack Architecture Mobile App Development Cloud & Serverless Solutions Database Design & Optimization Third-Party Integrations Performance, Security & Scalability CI/CD & Deployment Agile & Remote Collaboration

Verifications

On time

100%

On budget

100%

Accept rate

100%

Freelancer Javascript Developers Colombia
See all Javascript Developers in Colombia

Portfolio

Portfolio

13802348
Reviewed and improved a full-stack application built with FastAPI (backend) and Next.js + Shadcn (frontend). The client was an experienced engineer transitioning into modern Python and React. The goal was not just to “fix issues”, but to raise the overall level of structure, clarity, and long-term maintainability. 1. Backend (FastAPI): - Reviewed project structure, routing patterns, dependency injection usage - Refactored service layers to separate business logic from transport layer - Improved Pydantic models and validation patterns - Standardized error handling and response contracts - Reviewed async usage and I/O boundaries - Added guidance on testing strategy (pytest, integration vs unit tests) 2. Frontend (Next.js + Shadcn): - Reviewed component composition and layout structure - Simplified state management and data fetching patterns - Cleaned up server/client component boundaries - Improved form handling and validation flow - Reduced unnecessary re-renders and tightened prop

FastAPI &Next.js Architecture Review

Reviewed and improved a full-stack application built with FastAPI (backend) and Next.js + Shadcn (frontend). The client was an experienced engineer transitioning into modern Python and React. The goal was not just to “fix issues”, but to raise the overall level of structure, clarity, and long-term maintainability. 1. Backend (FastAPI): - Reviewed project structure, routing patterns, dependency injection usage - Refactored service layers to separate business logic from transport layer - Improved Pydantic models and validation patterns - Standardized error handling and response contracts - Reviewed async usage and I/O boundaries - Added guidance on testing strategy (pytest, integration vs unit tests) 2. Frontend (Next.js + Shadcn): - Reviewed component composition and layout structure - Simplified state management and data fetching patterns - Cleaned up server/client component boundaries - Improved form handling and validation flow - Reduced unnecessary re-renders and tightened prop

FastAPI &Next.js Architecture Review

Reviewed and improved a full-stack application built with FastAPI (backend) and Next.js + Shadcn (frontend). The client was an experienced engineer transitioning into modern Python and React. The goal was not just to “fix issues”, but to raise the overall level of structure, clarity, and long-term maintainability. 1. Backend (FastAPI): - Reviewed project structure, routing patterns, dependency injection usage - Refactored service layers to separate business logic from transport layer - Improved Pydantic models and validation patterns - Standardized error handling and response contracts - Reviewed async usage and I/O boundaries - Added guidance on testing strategy (pytest, integration vs unit tests) 2. Frontend (Next.js + Shadcn): - Reviewed component composition and layout structure - Simplified state management and data fetching patterns - Cleaned up server/client component boundaries - Improved form handling and validation flow - Reduced unnecessary re-renders and tightened prop

FastAPI &Next.js Architecture Review

Reviewed and improved a full-stack application built with FastAPI (backend) and Next.js + Shadcn (frontend). The client was an experienced engineer transitioning into modern Python and React. The goal was not just to “fix issues”, but to raise the overall level of structure, clarity, and long-term maintainability. 1. Backend (FastAPI): - Reviewed project structure, routing patterns, dependency injection usage - Refactored service layers to separate business logic from transport layer - Improved Pydantic models and validation patterns - Standardized error handling and response contracts - Reviewed async usage and I/O boundaries - Added guidance on testing strategy (pytest, integration vs unit tests) 2. Frontend (Next.js + Shadcn): - Reviewed component composition and layout structure - Simplified state management and data fetching patterns - Cleaned up server/client component boundaries - Improved form handling and validation flow - Reduced unnecessary re-renders and tightened prop

FastAPI &Next.js Architecture Review

13802348
Reviewed and improved a full-stack application built with FastAPI (backend) and Next.js + Shadcn (frontend). The client was an experienced engineer transitioning into modern Python and React. The goal was not just to “fix issues”, but to raise the overall level of structure, clarity, and long-term maintainability. 1. Backend (FastAPI): - Reviewed project structure, routing patterns, dependency injection usage - Refactored service layers to separate business logic from transport layer - Improved Pydantic models and validation patterns - Standardized error handling and response contracts - Reviewed async usage and I/O boundaries - Added guidance on testing strategy (pytest, integration vs unit tests) 2. Frontend (Next.js + Shadcn): - Reviewed component composition and layout structure - Simplified state management and data fetching patterns - Cleaned up server/client component boundaries - Improved form handling and validation flow - Reduced unnecessary re-renders and tightened prop

FastAPI &Next.js Architecture Review

Reviewed and improved a full-stack application built with FastAPI (backend) and Next.js + Shadcn (frontend). The client was an experienced engineer transitioning into modern Python and React. The goal was not just to “fix issues”, but to raise the overall level of structure, clarity, and long-term maintainability. 1. Backend (FastAPI): - Reviewed project structure, routing patterns, dependency injection usage - Refactored service layers to separate business logic from transport layer - Improved Pydantic models and validation patterns - Standardized error handling and response contracts - Reviewed async usage and I/O boundaries - Added guidance on testing strategy (pytest, integration vs unit tests) 2. Frontend (Next.js + Shadcn): - Reviewed component composition and layout structure - Simplified state management and data fetching patterns - Cleaned up server/client component boundaries - Improved form handling and validation flow - Reduced unnecessary re-renders and tightened prop

FastAPI &Next.js Architecture Review

Reviewed and improved a full-stack application built with FastAPI (backend) and Next.js + Shadcn (frontend). The client was an experienced engineer transitioning into modern Python and React. The goal was not just to “fix issues”, but to raise the overall level of structure, clarity, and long-term maintainability. 1. Backend (FastAPI): - Reviewed project structure, routing patterns, dependency injection usage - Refactored service layers to separate business logic from transport layer - Improved Pydantic models and validation patterns - Standardized error handling and response contracts - Reviewed async usage and I/O boundaries - Added guidance on testing strategy (pytest, integration vs unit tests) 2. Frontend (Next.js + Shadcn): - Reviewed component composition and layout structure - Simplified state management and data fetching patterns - Cleaned up server/client component boundaries - Improved form handling and validation flow - Reduced unnecessary re-renders and tightened prop

FastAPI &Next.js Architecture Review

Reviewed and improved a full-stack application built with FastAPI (backend) and Next.js + Shadcn (frontend). The client was an experienced engineer transitioning into modern Python and React. The goal was not just to “fix issues”, but to raise the overall level of structure, clarity, and long-term maintainability. 1. Backend (FastAPI): - Reviewed project structure, routing patterns, dependency injection usage - Refactored service layers to separate business logic from transport layer - Improved Pydantic models and validation patterns - Standardized error handling and response contracts - Reviewed async usage and I/O boundaries - Added guidance on testing strategy (pytest, integration vs unit tests) 2. Frontend (Next.js + Shadcn): - Reviewed component composition and layout structure - Simplified state management and data fetching patterns - Cleaned up server/client component boundaries - Improved form handling and validation flow - Reduced unnecessary re-renders and tightened prop

FastAPI &Next.js Architecture Review

5.0 · 3 Reviews
Reviews
M

Custom Minimalistic Advertising Page • €60 EUR

Working with Emmanuel was a great experience from start to finish. He delivered an outstanding landing page that not only looks modern and clean, but is also fast and well-structured!

Massimo P.

@massimop8

•

Flag of

Prague, Czech Republic

•

15 days ago

Share

User Avatar

IMDb Credits Scraper Function • $30 USD

In an ocean of freelancers who bid on any project that shows up and fell short even showing a basic understanding of the project requirements, Emmanuel was like a lighthouse on a stormy night. They immediately understood what I needed, only required very little clarification, and had a solution over to me within hours. They're amazing at what they do. Will definitely be working with Emmanuel again. A+ freelancer!

Branden G.

@AutomationAdept

•

Flag of

Alto, United States

•

1 month ago

Share

User Avatar

AI-Powered MVP & React Refactor • $10 USD

Emmanuel provided excellent daily progress updates and delivered the project very successfully. Communication was easy and smooth throughout, and he was always responsive to my messages. His skills are highly professional, and he clearly has senior-level expertise in AI and React web development. I would gladly work with him again in the future. Thank you so much, Emmanuel.

Allen James Antonio P.

@allenjames0828

•

Flag of

Angeles City, Philippines

•

2 months ago

Share

Experience

Fractional CTO

Dec, 2022 - Present

•

3 years, 2 months

Venley.ai

Dec, 2022 - Present

•

3 years, 2 months

- Led and mentored developers in AI-powered development workflows, using tools like Claude Code and Cursor. - Reduced development cycles and improved code quality through structured AI-assisted engineering practices.

Dec, 2022 - Present

•

3 years, 2 months

Senior Software Engineer (AI & Mobile)

Apr, 2022 - Present

•

3 years, 10 months

Love to Ride

Apr, 2022 - Present

•

3 years, 10 months

- Delivered production-ready features 2–3× faster using AI/LLM-assisted development (ChatGPT, Copilot, Claude, Cursor), while mentoring teammates on effective AI adoption. - Built the Android app from scratch using Flutter, enabling a unified iOS & Android codebase and significantly expanding platform reach. - Implemented a real-time computer vision model (OpenCV) to predict users’ transportation modes, improving data accuracy and user insights.

Apr, 2022 - Present

•

3 years, 10 months

CTO (Part-Time)

Mar, 2020 - Dec, 2023

•

3 years, 9 months

ReferHub.io

Mar, 2020 - Dec, 2023

•

3 years, 9 months

- Architected and built a SaaS platform from scratch, owning all technical and architectural decisions. - Integrated secure cloud infrastructure (Azure), CI/CD pipelines, and monitoring to maintain 99.9% uptime over 3+ years. - Hired and mentored developers, improving delivery speed and collaboration as the business scaled. - Maintained zero security incidents while supporting real-world production traffic. Tech: Azure, SaaS Architecture, CI/CD, Security, Team Leadership

Mar, 2020 - Dec, 2023

•

3 years, 9 months

Education

The Hong Kong University of Science and Technology

2013 - 2018

•

5 years

Master’s degree in Computer Science

Flag of

Hong Kong

2013 - 2018

•

5 years

Certifications

Freelancer Orientation

Freelancer Orientation

Python Level 1

Python

JavaScript - Level 1

JavaScript

US English - Level 1

US English

P

Preferred Freelancer Program SLA

Freelancer logo US (International) / English
Help & Support

Freelancer

Categories Projects Contests Freelancers Enterprise Innovation Challenges AI Development Membership Preferred Freelancer Program Project Management Local Jobs Photo Anywhere Showcase API for Developers Get Verified

About

About us How it Works Security Investor Sitemap Stories News Team Awards Press Releases Careers

Terms

Privacy Policy Terms and Conditions Copyright Policy Code of Conduct Fees and Charges

Partners

Escrow.com Loadshift Warrior Forum

Apps

Apple App Store logoGoogle Play logo

Registered Users

Total Jobs Posted

Freelancer ® is a registered Trademark of Freelancer Technology Pty Limited (ACN 142 189 759)

Copyright © 2026 Freelancer Technology Pty Limited (ACN 142 189 759)