Hello, I'm Guilherme Fonseca

Full StackDeveloper

I help companies turn ideas into scalable digital products with real business impact, combining product vision, technical leadership, and high-performance engineering.

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. The goal is always the same: deliver software that drives measurable business value.

•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.jsAdonisJSExpressPostgreSQLMongoDBMySQLGitDockerREST APIsHTML5CSS3TailwindCSSGraphQLAWSCI/CDJestCypressSelenium

Professional Experience

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

Full Stack Developer

ANC - National Breeders Association

Dec 2025 - Present

Remote

•Rebuilt the institutional website from WordPress to Next.js (SSR/SSG), improving speed, SEO, and Core Web Vitals.
•Delivered internal features with Python/Django, DRF APIs, authentication, and a customized admin panel.
•Integrated Next.js + Django APIs with caching strategies to improve user experience and operational efficiency.

Full Stack Developer

HOX

Mar 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, D3.js, 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.

Vite.jsTypeScriptChakra UIMapboxResponsive DesignRedux Toolkit

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

Next.jsTypeScriptTailwindCSSResponsive Design

Grow Solar Lead Gen

High-conversion landing page for solar energy lead generation.

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

Next.jsTypeScriptTailwindCSSResponsive Design

LK Sneakers

High-conversion landing page for a sneaker brand with modern visuals and mobile-first UX.

Live Demo

Next.jsTypeScriptTailwindCSSResponsive Design

Studio Silo

Business portfolio presenting projects, services, and technical expertise to support client acquisition.

Live Demo

ReactTypeScriptNode.jsExpressPostgreSQLREST APIs

Mao na Roda

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

Live Demo

Next.jsTypeScriptTailwindCSSResponsive Design

A Camponesa

Landing page for an artisanal bakery emphasizing product quality and brand storytelling.

Live Demo

Next.jsTypeScriptTailwindCSSResponsive Design

Burger Pro

Landing page for an artisan burger course focused on lead generation and conversion.

Live Demo