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Who Is Marcelo B. Diani? Senior Full Stack Developer & Team Lead

Senior Full Stack & DevOps | Team Lead | Founder | E-commerce & AI Specialist. Senior Full Stack Developer with 7+ years of experience specializing in TypeScript, React, and Node.js. Computer Engineer graduated from the University of São Paulo (USP) and mathematics olympiad gold medalist. Led teams of up to 6 developers managing 14 Shopify apps serving tens of thousands of daily users. Worked in EdTech, FinTech and E-commerce companies. Top 4% Cursor AI user worldwide in 2025. Positive mindset, driven by improving people's lives through technology.

What Skills and Technologies Does Marcelo Diani Use?

Marcelo Diani is proficient in a wide range of modern technologies spanning frontend, backend, databases, DevOps, cloud infrastructure, and AI/ML.

Technical Skills Overview
FrontendBackendDatabaseDevOps & CloudAI & Machine Learning
React, Next.js, TypeScript, Angular, Tailwind CSS, Three.jsNode.js, Express, GraphQL, REST, Python, .NETPostgreSQL, MongoDB, DynamoDB, RedisAWS, Docker, GitHub Actions, Terraform, CDKLLMs, LangChain, RAG, OpenAI, Gemini

What Is Marcelo Diani's Professional Experience?

  1. WithWillow.ai — Freelancer (2026). Created a marketplace with 1,000+ MCPs for enterprise companies. Cloned Webflow components to Next.js. Added Cloudflare workers for multi-frontend domain.
  2. Clearer.io — Senior Full Stack Developer / Team Lead / Scrum Master (2022 – 2025). Led two teams (3 and 6 developers). Managed 14 Shopify apps with multi-million dollar annual revenue. Migrated from Heroku to AWS using CDK. Implemented observability with Datadog.
  3. Acesso Comercial — Founder (2021 – 2022). Founded an e-commerce platform (Shopify alternative) with ERP, CRM, and AI features. Onboarded 600+ stores. 1,000+ tests. 5 microservices.
  4. Vórtx DTVM — Full Stack Developer (2020 – 2021). Financial company. Upgraded legacy Angular/.NET platform. Migrated 1,800 Excel records to automated platform. Generated 200,000 dynamic PDFs with Puppeteer.
  5. Ênfase Instituto Jurídico — Full Stack Developer Intern (2019 – 2020). EdTech company. Developed 2 platforms from scratch for 13,000+ law students. Built real-time analytics with Kafka.

How Can You Hire Marcelo Diani as a Freelance Developer?

I'm always open to new opportunities and interesting conversations.. Contact Marcelo via WhatsApp, email (marcelodianib@gmail.com), LinkedIn, or GitHub. He offers full stack development, technical consulting, team leadership, and e-commerce optimization services. Available for remote work worldwide across all time zones.

Frequently Asked Questions

What technologies does Marcelo Diani specialize in?
I specialize in React, Node.js, TypeScript, Next.js, and AWS. I also have strong experience with MongoDB, PostgreSQL, Docker, GraphQL, and AI/ML technologies including LLMs, LangChain, and RAG. My full tech stack spans frontend, backend, databases, DevOps, and cloud infrastructure.
How can I hire Marcelo Diani as a freelance developer?
You can reach me via WhatsApp, email, or LinkedIn. I offer full stack development, technical consulting, team leadership, and e-commerce optimization services. Fill out the quote request form above or send me a message directly — I typically respond within 24 hours.
What is Marcelo Diani's educational background?
I hold a Computer Engineering degree from the University of São Paulo (USP), São Carlos campus, graduating in the top 10 of 61 students in 2019. I'm also a gold medalist at the OBMEP national mathematics olympiad and hold a CPA-20 financial certification with a 93% score.
What kind of projects does Marcelo Diani build?
I build web applications, e-commerce platforms, SaaS products, mobile apps, and AI-powered solutions. Notable projects include leading 14+ Shopify apps generating millions in annual revenue, founding an e-commerce startup with 600+ stores, and building open-source tools like BoolTools SEO Crawler.
Where is Marcelo Diani located and does he work remotely?
I'm based in São Paulo, Brazil, and available for remote work across all time zones. I have extensive experience working with international teams, including 3 years leading remote teams for a Boston-based company. I speak Portuguese (native), English (advanced), German, Spanish, and Italian.
How many years of experience does Marcelo Diani have?
I have 7+ years of professional experience in software development, with 3+ years in leadership roles. I've led teams of up to 6 developers, written over 1,000 tests, and managed 25+ production applications across EdTech, FinTech, and E-commerce companies.
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Hello, I'm

Marcelo B. Diani

Senior Full Stack & DevOps | Team Lead | Founder | E-commerce & AI Specialist

Top 4% Cursor user in 2025

“My mission is to improve people's lives through technology.”

About Me

Senior Full Stack Developer with 7+ years of experience specializing in TypeScript, React, and Node.js. Computer Engineer graduated from the University of São Paulo (USP) and mathematics olympiad gold medalist. Led teams of up to 6 developers managing 14 Shopify apps serving tens of thousands of daily users. Worked in EdTech, FinTech and E-commerce companies. Top 4% Cursor AI user worldwide in 2025. Positive mindset, driven by improving people's lives through technology.

Languages

0+
Years of Experience
0+
Years of Leadership
0+
Tests Written
0+
Apps Managed
Live GitHub StatsREST API / fetch / React

Experience

2026
Remote

WithWillow.ai logoWithWillow.ai

Freelancer

  • ›Created a marketplace with more than 1,000 MCPs for enterprise companies.
  • ›Cloned components from Webflow to Next.js allowing users to navigate without UI mismatches.
  • ›Added workers in Cloudflare allowing multiple frontends in the same domain, enabling the marketing team to work on the project too.
  • ›Optimized website SEO with different techniques to boost search engine rankings.
  • ›experience.positions.withWillow.bullets.4
TypeScriptNext.jsCloudflareMCPAISecurityFigma
2022 – 2025
Boston, Massachusetts, Remote

Clearer.io logoClearer.io

Senior Full Stack Developer / Team Lead / Scrum Master

  • ›Led two teams (3 and 6 developers) as Team Lead and Scrum Master, owning PR reviews, sprint planning, 1:1s, interviews, and delivery tracking with Jellyfish, improving on-time delivery rate across the team.
  • ›Managed 14 Shopify App Store products (bundles, upsells, checkout, returns, currency conversion) serving tens of thousands of daily users and generating multi-million dollar annual revenue.
  • ›Migrated all managed applications from Heroku to AWS using a reusable Infrastructure as Code (IaC) library built with CDK, reducing hosting costs.
  • ›Increased test coverage from zero by introducing unit and end-to-end tests via Datadog Synthetic Monitoring. Added Codacy for static code analysis.
  • ›Reduced average debugging time by implementing observability (logging and distributed tracing) in Datadog. Built a Memcached caching layer that eliminated database timeouts, and a Lambda function using DynamoDB and LLMs to auto-generate customized storefront widgets.
JavaScriptTypeScriptNode.jsReactNext.jsMongoDBPostgreSQLRESTRedisReact NativeAWSCDKDataDogHerokuCodacyJellyfishCloudflareShopify
2021 – 2022
São Carlos, São Paulo

Acesso Comercial logoAcesso Comercial

Founder

  • ›Founded and built an e-commerce platform (Shopify alternative) for small businesses with ERP, CRM, SSR blog, and omnichannel chat with websockets, onboarding over 600 stores.
  • ›Architected 5 microservices (auth, core, metrics, payments, messaging) with Blue-Green deployment via GitHub Actions, Docker, and Nginx. Monitored with Prometheus, OpenTelemetry, and Grafana.
  • ›Built with React, Node.js, GraphQL, Relay, and MongoDB. Integrated 10+ third-party APIs. Implemented AI features using OpenAI, Gemini, and RAG with Typesense.
  • ›Led a team of 2 developers and 1 support specialist, coordinating with designers, media buyers, lawyers, and consultants.
  • ›Achieved 1,000+ automated tests with Mocha, Sinon, Chai, and Cypress. Collaborated with 30+ merchants to co-design features.
TypeScriptNode.jsReactNext.jsMongoDBGraphQLAWSGitHub ActionsDockerWebSocketLLMsRAGSSRBullMQRedis
2020 – 2021
São Paulo, São Paulo

Vórtx DTVM logoVórtx DTVM

Full Stack Developer

  • ›Upgraded and launched a legacy Angular/.NET platform into production for investment fund operations.
  • ›Built and maintained 3 microservices and 2 Lambda functions with Angular, .NET Core, MongoDB cluster, and SQL Server.
  • ›Migrated 1,800 manually stored Excel records to an automated online platform, eliminating manual effort.
  • ›Delivered the platform to external users in 6 months, on schedule and within budget.
  • ›Implemented refresh token authentication, backend pagination (reducing response time to under 500ms), and generated 200,000 dynamic PDFs with Puppeteer for compliance.
C#.NETJavaScriptAngularSQL ServerMongoDBRESTGitHub ActionsLambdaPuppeteerRedux
2019 – 2020
São Carlos, São Paulo

Ênfase Instituto Jurídico logoÊnfase Instituto Jurídico

Full Stack Developer Intern

  • ›Developed 2 platforms from scratch (postgraduate courses and a revamp of an old platform) serving 13,000+ active law students, built with React, Node.js, PostgreSQL, and GraphQL.
  • ›Redesigned the front-end architecture using Atomic Design, breaking a monolithic codebase into reusable components and reducing maintenance effort.
  • ›Built a real-time student analytics dashboard connected to a Kafka event system, giving users visibility into their course progress and engagement.
  • ›Created a configurable database seeder that eliminated the need for production data in local development, speeding up developer onboarding and testing.
  • ›experience.positions.enfase.bullets.4
JavaScriptNode.jsReactPostgreSQLGraphQLRelayKafkaPrismaStyled Components

Skills & Technologies

Interact with the sphere to explore my tech stack

Frontend

ReactNext.jsTypeScriptAngularReact NativeCSS3HTML5RelayReduxStyled ComponentsStorybookAstroTauriElectron

Backend

Node.jsGraphQL.NETC#PythonRESTExpressPrismaKafkaBullMQWebSocketGolang

Database

MongoDBPostgreSQLSQL ServerRedisDynamoDBSupabaseMySQLTypesenseClickHouse

DevOps & Cloud

AWSDockerCDKLambdaCI/CDGitHub ActionsCloudflareHerokuVercelDataDogGrafanaPrometheusOpenTelemetryTerraform

AI & Machine Learning

LLMsLangChainLangGraphRAGTensorFlowOpenAIGeminiCursorMCP

Other

GitShopifyStripeCypressPuppeteerSEOFigmaUnity

Interactive Lab

Explore interactive simulations across engineering and computer science

Interactive Lab

Security Awareness

See what your browser reveals — and how this site protects you

Your Digital Fingerprint

This is what any website can learn about you from a single visit

Scanning your browser...

This data is collected client-side for demonstration only and is NOT stored or transmitted.

Side Projects

Fast Read

2026

Cross-platform speed reading web and desktop application using RSVP (Rapid Serial Visual Presentation) with ORP highlighting.

Next.jsTypeScriptTauri

Design Patterns Quest

2026

Interactive learning platform for mastering all 22 Gang of Four design patterns through an RPG-style experience.

Next.jsTypeScript

Browser Pal

2026

AI-driven browser supporting manual navigation and autonomous orchestration via MCP API, with request interception, ad blocker, and crypto wallet.

ElectronTypeScriptMCP

Companies Data Visualizer

2026

Big data pipeline to ingest and index open-source government data from 70M+ companies, enabling high-performance filtering and market trend analytics.

GolangPostgreSQLAstro

BoolTools SEO / GDPR / Security / Page Speed

2026

Open-source SEO/GEO, GDPR, Security, and Page Speed auditing tools for search visibility, compliance, defense, and web performance.

GolangAstroSEOGEOOpen SourceMCP

WithWillow.ai

2026

Contributions to the secure MCP gateway connecting AI agents to enterprise systems.

TypeScriptNext.jsMCPCloudflareSecurity

Welcome to Brazil

2026

Complete guide for foreigners to visit, live, and thrive in Brazil.

TypeScriptNext.jsReactVercelSupabase

marcelodiani

2025

My portfolio website (marcelodiani.online).

TypeScriptNext.jsReactThree.jsVercel

vc-chess

2025

Real-time multiplayer chess game — no account required.

TypeScriptNext.jsReactWebSocketReal-time

vc-billings

2025

Personal monthly payment tracker (Next.js + Drizzle + Neon Postgres).

TypeScriptNext.jsDrizzleNeonPostgreSQL

vc-ecommerce

2025

E-commerce storefront template.

TypeScriptNext.jsReactE-commerce

vc-plumbing-quote-landing

2025

Service quote landing page.

TypeScriptNext.jsReactLanding Page

vc-product-landing-page

2025

Product launch landing page (Next.js + Framer Motion).

TypeScriptNext.jsReactFramer Motion

Language Translator

2025

React Native + Python translator using LangGraph and OCR.

PythonFastAPITypeScriptReact NativeLangGraphOCRLLMs

Learn Code

2025

Online interface to learn languages and frameworks through concepts and puzzles.

TypeScriptReactNext.jsVercel

Coding Classes

2025

Recorded coding classes teaching AI-assisted development techniques.

JavaScriptNode.jsReactCursorSupabase

Banner Generator

2025

Banner generation tool leveraging multiple LLMs for quality output.

TypeScriptNode.jsLLMs

Crypto Tax Calculator

2022

Cryptocurrency calculator (JavaScript).

Node.jsJavaScriptTests

Platform Jump Game

2021

Unity C# mobile game with obstacles and global ranking on Google Play.

C#UnityFirebaseGoogle Play

PicBird

2021

Mobile game built with Unity and C#.

UnityC#MobileGame

Education & Achievements

USP Logo

Computer Engineering

University of São Paulo (USP)

2015 – 2019

Final grade: 7.8 — Top 10 of 61 students. Completed with no failed courses.

📊

CPA-20 Certification

2020

Score 93% — Ranked 1st among all candidates at the company.

🏅

Mathematics Olympiad — OBMEP

2009 – 2012

Gold medal winner. Participated in the 4-year program at UNESP for medalists.

💻

Hackathon Elo+Getnet

2018

Developed a solution to facilitate consumer purchases in a weekend hackathon.

🤖

Warthog Robotics — USP

2015 – 2016

Control Department of USP São Carlos robotic team for robot soccer championships.

📚

Pontinha Project

2019

Taught English to students in a public school once a week for 6 months.

🧥

USP Winter Clothing Drive

2019

Collected about 60,000 pieces of clothing for institutions in São Carlos region.

🎄

Operation Christmas

2018 – 2019

Gathered food and distributed Christmas presents for children in need.

Blog

Latest insights on software development and engineering

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I'm always open to new opportunities and interesting conversations.

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Frequently Asked Questions

Common questions about my services, experience, and how we can work together

I specialize in React, Node.js, TypeScript, Next.js, and AWS. I also have strong experience with MongoDB, PostgreSQL, Docker, GraphQL, and AI/ML technologies including LLMs, LangChain, and RAG. My full tech stack spans frontend, backend, databases, DevOps, and cloud infrastructure.

You can reach me via WhatsApp, email, or LinkedIn. I offer full stack development, technical consulting, team leadership, and e-commerce optimization services. Fill out the quote request form above or send me a message directly — I typically respond within 24 hours.

I hold a Computer Engineering degree from the University of São Paulo (USP), São Carlos campus, graduating in the top 10 of 61 students in 2019. I'm also a gold medalist at the OBMEP national mathematics olympiad and hold a CPA-20 financial certification with a 93% score.

I build web applications, e-commerce platforms, SaaS products, mobile apps, and AI-powered solutions. Notable projects include leading 14+ Shopify apps generating millions in annual revenue, founding an e-commerce startup with 600+ stores, and building open-source tools like BoolTools SEO Crawler.

I'm based in São Paulo, Brazil, and available for remote work across all time zones. I have extensive experience working with international teams, including 3 years leading remote teams for a Boston-based company. I speak Portuguese (native), English (advanced), German, Spanish, and Italian.

I have 7+ years of professional experience in software development, with 3+ years in leadership roles. I've led teams of up to 6 developers, written over 1,000 tests, and managed 25+ production applications across EdTech, FinTech, and E-commerce companies.

Curious About the Code?

This entire portfolio is open source. Explore how it was built — from 3D scenes and real-time data widgets to the AI assistant and game engine.

Next.js 16 & React 19Three.js 3D ScenesAI Chat AssistantBilingual (EN/PT)Real-Time Data APIsCanvas Games & Demos
View Source on GitHub
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