Hello, I'm Guilherme Fonseca

Full StackDeveloper

I build web products end to end — from architecture to deploy — with React/Next.js, Node.js, and Python/Django, focused on performance and SEO.

5 years of full stack experienceTechnical leadership in end-to-end projectsReact/Next.js, Node.js, and DjangoPerformance, SEO, and business value

About Me

Engineering products that perform, scale, and convert.

I am Guilherme Fonseca, a Full Stack Developer with 5 years of experience delivering web platforms end-to-end for startups, industry, and associations. My core stack includes React/Next.js, Node.js, and Django.

I work from discovery to production: architecture decisions, API design, code review, SEO/performance optimization, and stakeholder alignment. I focus on performance, Core Web Vitals, and technical SEO — apps that load fast, rank well, and scale.

•Experience across SaaS, education, real estate, and industrial products.
•Hands-on collaboration with stakeholders from discovery to continuous delivery.
•Strong focus on technical SEO, Core Web Vitals, and scalable architecture.

Frontend Architecture

Backend Systems

Database Design

Clean Code

Tech Stack

JavaScriptTypeScriptReactNext.jsNode.jsAdonisJSExpressPythonDjangoWagtailPostgreSQLMongoDBMySQLGitDockerRedisCeleryREST APIsHTML5CSS3TailwindCSSGraphQLAWSCI/CDJestCypressSelenium

Professional Experience

Full stack delivery focused on architecture, performance, and high-impact digital products.

Full Stack Developer

ANC - National Breeders Association

Mar 2026 - Present

On-site - Pelotas, RS

•Migrated the institutional website from WordPress to Wagtail (Django CMS), improving load performance and SEO.
•Built internal management-system features with Python/Django: Django ORM data modeling, REST APIs with Django REST Framework, authentication, and a customized Django Admin panel.
•Set up async and scheduled tasks with Celery and Redis; containerized with Docker and served via Nginx.

Full Stack Developer

HOX

Jan 2021 - Dec 2025

Remote

•Mappo: real estate platform with interactive property mapping, advanced filtering, and secure AdonisJS APIs.
•Dynamox: BI dashboards for predictive maintenance using React, Highcharts, and 3D visualizations with Three.js/R3F.
•GrowSolar: led architecture and end-to-end delivery of the education platform and SEO-optimized institutional website.

Featured Projects

A selection of my recent work and case studies.

Next.jsTypeScriptMapboxResponsive DesignRedux ToolkitAdonisJS

Mappo

Full stack real estate platform with interactive lot/property mapping, advanced filters, and secure APIs to support high-volume geospatial data.

Live Demo

ReactTypeScriptMaterial UIStyled ComponentsResponsive DesignHighchartsRedux ToolkitThreejsReactThreeFiber

DynaPredict

Industrial predictive maintenance ecosystem with BI dashboards, data intelligence, and 3D asset visualization for real-time decisions.

Live Demo

Next.jsTypeScriptTailwindCSSResponsive DesignStrapi CMS

GrowSolar Institucional

SEO-driven institutional website with integrated blog and course funnels, designed to increase authority, organic traffic, and conversion.

Live Demo

Vite.jsTypeScriptChakra UIResponsive DesignRedux ToolkitAdonisJSMySQLREST APIs

GrowSolar Plataforma

Education platform for courses, mentorships, and technical projects, delivered with end-to-end architecture and scalable APIs.

Live Demo

Vite.jsShadcnUITypeScriptTailwindCSSResponsive DesignZustandNode.jsExpressPostgreSQLREST APIs

Finance Dash

Financial control dashboard with expense, income, credit card, and investment modules, built as a graduation capstone and evolved as a personal product.

Live Demo

ReactTypeScriptNode.jsExpressPostgreSQLREST APIs

Mao na Roda

Service platform connecting clients with qualified professionals through a streamlined web experience.

Live Demo