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I'm a passionate software developer with experience in top-tier global companies since 2016. My expertise lies in building scalable backend systems, AI agents, and automation workflows. I'm a communicative and responsible professional dedicated to problem-solving, clean code practices, and high-impact teamwork.…

William Guitarrari

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

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I'm a passionate software developer with experience in top-tier global companies since 2016. My expertise lies in building scalable backend systems, AI agents, and automation workflows. I'm a communicative and responsible professional dedicated to problem-solving, clean code practices, and high-impact teamwork.…

Available to hire

I’m a passionate software developer with experience in top-tier global companies since 2016. My expertise lies in building scalable backend systems, AI agents, and automation workflows.

I’m a communicative and responsible professional dedicated to problem-solving, clean code practices, and high-impact teamwork.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Portuguese

Fluent

English

Advanced

Spanish; Castilian

Intermediate

Work Experience

Automation & AI Agent Developer at NEO Estech

January 1, 2025 - January 1, 2026

Developed intelligent chatbots for data analysis and platform queries. Integrated WhatsApp and web widgets using Chatwoot. Built complex workflows in n8n using Gemini and GPT models for recursive tasks. Maintained APIs in PHP and used AI-assisted development (Cursor, Claude).

Backend Developer at Sinch

January 1, 2021 - December 31, 2024

Developed chatbots for major global brands (Magalu, iFood, Natura, PepsiCo). Built and managed APIs using Node.js and AWS Lambda (Serverless). Pioneered WhatsApp flow implementation in the Brazilian market.

Backend Developer at SmartEnvios

January 1, 2020 - December 31, 2020

Maintained logistics microservices using Node.js and React.

Developer Analyst at Dart Digital

January 1, 2019 - December 31, 2020

Developed mobile apps with React Native; built web systems with React and backend APIs using Nest.js.

Full-Stack Developer at Tout

January 1, 2018 - December 31, 2019

Developed web applications using PHP and Laravel. Managed hosting environments (WHM/cPanel) and WordPress deployments.

Intern at B2MAKE

January 1, 2017 - December 31, 2018

Developed e-commerce platforms and integrated payment gateways. Managed SEO strategies and digital marketing campaigns.