Gelson Henrique

Senior Full-Stack Developer with 6+ years of experience building custom automation systems, CRMs, and API integrations that help businesses scale.

What I do best

• Build end-to-end automation workflows using N8N, saving teams 20+ hours/week
• Develop custom CRM platforms and business tools from scratch
• Integrate third-party APIs (Stripe, WhatsApp, HubSpot, OpenAI, and 50+ others)
• Implement Generative AI solutions (OpenAI, Claude, custom agents) for business automation
• Lead technical squads and deliver projects on time with clean, maintainable code

Tech stack: Python, JavaScript/TypeScript, Node.js, React, PostgreSQL, Supabase, N8N, Docker, REST APIs, and Generative AI frameworks.

I've built systems that process thousands of transactions daily, automated entire marketing funnels, and created AI-powered tools that replaced manual workflows for companies across multiple industries.

I work in US-aligned time zones (EST/CST), communicate clearly in English, and I'm comfortable with async workflows, Slack, and daily standups. Available for long-term contracts and dedicated projects.

Senior Full-Stack Developer & AI Automation Specialist | Freelance / Contract | 2020 - Present

• Architected and deployed 30+ custom automation workflows using N8N and Python, reducing operational costs by 40-60% for clients
• Built custom CRM systems handling 10,000+ contacts with automated pipelines, replacing expensive SaaS tools
• Developed and maintained 20+ REST API integrations connecting Stripe, WhatsApp Business, HubSpot, and Google Workspace
• Implemented Generative AI solutions using OpenAI and Claude APIs for lead scoring, content generation, and customer support automation
• Led cross-functional squads of 3-5 developers, managing sprints, code reviews, and deployments
• Created marketing automation systems including email sequences, lead capture funnels, and analytics dashboards

Full-Stack Developer | 2018 - 2020

• Developed web applications using Python, Node.js, and React serving 5,000+ daily active users
• Built RESTful APIs processing 10,000+ requests/day with 99.9% uptime
• Designed database architectures (PostgreSQL, MySQL) handling 500K+ records
• Collaborated with marketing teams to build landing pages, A/B testing systems, and tracking dashboards

Bachelor's Degree in Information Systems

Certifications

• N8N Workflow Automation
• Python Professional Development
• Generative AI & LLM Applications
• REST API Design & Integration