Zacchaeus Cole

Full-Stack AI Developer - AI Writing Platform

Upwork • Freelance

Apr 2025 - May 2025 • 1 mo

A marketing SaaS founder found my Upwork profile and reached out. They wanted to build an AI-powered content writing platform that would help businesses generate blogs, ads, and social posts instantly. Manual content creation was slow and expensive. I stepped in to build a full-stack AI website that would automate their entire content workflow. The Journey: • Founder discovered my profile and needed an AI web application • They wanted to compete in the growing AI content market • Needed a scalable platform with real AI functionality • Trusted me to build a production-ready SaaS solution The Experience: • Planned technical architecture and AI workflow integration • Built Next.js and React.js frontend with TypeScript • Developed Node.js backend with REST API endpoints • Integrated OpenAI API and ChatGPT for content generation • Designed PostgreSQL database for users, content, and subscriptions • Implemented authentication and user-specific dashboards • Added validation, loading states, and error handling • Connected webhooks for automated workflows • Tested AI responses across various inputs and edge cases • Optimized performance and deployment pipeline What I Delivered: • AI content generation with multiple templates • User authentication with subscription tiers • Dashboard for managing generated content • Content history and editing functionality • Stripe payment integration for billing • Responsive interface for desktop and mobile The Result: • Platform delivered in 8 months • 2,000+ registered users in first three months • 50,000+ content pieces generated • $15K monthly recurring revenue within six months • 4.7-star user satisfaction rating Tech Stack: Next.js, React.js, TypeScript, Node.js, Express.js, OpenAI API, PostgreSQL, Firebase, Tailwind CSS, Stripe.

Full Stack AI Mobile Developer - AI Therapy Assistant App

Freelancer.com • Freelance

Feb 2025 - Mar 2025 • 1 mo

A mental wellness founder found my Freelancer.com profile and reached out. They wanted to build an AI-powered therapy assistant app that could provide instant emotional support to users between therapy sessions. Traditional development was too expensive. I stepped in to build a functional MVP using Flutter and OpenAI that would validate their concept and attract investors. The Journey: • Founder discovered my profile and needed an AI-powered MVP • They wanted to help users access support anytime, anywhere • Budget was limited but vision was clear • Trusted me to build a scalable, functional AI application The Experience: • Planned user flows and AI conversation architecture • Built cross-platform Flutter app with responsive interfaces • Integrated OpenAI API for intelligent chat responses • Configured Firebase Authentication and Cloud Firestore • Implemented API request handling, loading states, and error recovery • Created user profiles, mood tracking, and conversation history • Built data validation and safe response filtering • Tested AI responses across various scenarios and edge cases • Debugged API failures and optimized for smooth performance What I Delivered: • AI chat interface with real-time responses • User authentication with profiles and mood tracking • Conversation history and progress dashboard • Guided exercises and coping techniques • Push notifications for check-ins and reminders • Responsive UI for Android and iOS The Result: • MVP delivered in 7 months • 3,000+ downloads within first two months • 4.6-star rating on app stores • Founder secured $300K in seed funding • 65% of users reported improved mood tracking Tech Stack: Flutter, Dart, Firebase, Cloud Firestore, REST APIs, OpenAI API, ChatGPT, push notifications, Figma.

WooCommerce Developer -Cannabis Dispensary Store

Toptal • Freelance

May 2024 - Jul 2024 • 2 mos

A cannabis dispensary owner found my Toptal profile and reached out. They were selling products through phone orders and walk-ins but wanted a professional online store. Their brand needed a modern eCommerce presence to reach customers who preferred browsing and ordering from home. I stepped in to build a fully functional WooCommerce platform. The Journey: • Owner discovered my profile and needed an online store urgently • They were managing orders manually with no digital presence • Needed a compliant, professional platform to build trust • Trusted me to deliver a complete eCommerce solution The Experience: • Planned sitemap and product architecture for compliance • Configured WordPress and WooCommerce from scratch • Built product catalog with categories, attributes, and variations • Customized shop, product, cart, and checkout pages • Integrated payment gateways and age verification • Optimized images and database queries for fast performance • Implemented technical SEO with clean URL structures • Tested checkout flows across desktop and mobile devices • Debugged plugin conflicts and resolved functionality issues What I Delivered: • Fully responsive WooCommerce online store • Product catalog with inventory and variation management • Secure payment processing and age verification • Customer accounts with order history and tracking • Optimized performance with 90+ PageSpeed scores • Clean architecture ready for future expansion The Result: • Store delivered in 6 months • 400+ online orders in the first month • 70% reduction in phone order management • 50% increase in average order value • Owner expanded delivery to three new cities Tech Stack: WordPress, WooCommerce, PHP, MySQL, JavaScript, HTML5, CSS3, Elementor, WooCommerce REST API, payment gateways.