Software engineer focused on backend, production systems and cloud-native integrations from Brazil.

Rafael Nilson Witt

@rafaelnwitter ( Software Engineer / Backend / Infrastructure )

Rafael Nilson Witt profile photo

Intro

I'm a software engineer with 3+ years of experience building and operating backend services, APIs and cloud-native systems. My recent work focuses on Node.js, TypeScript, Python, AWS serverless infrastructure, event-driven integrations, automated testing and production reliability.

Primary work

Backend APIs, AWS serverless and production systems

Project sources

GitHub repositories, private client work and local case evidence

Strong cases

Focused shortlist across dashboards, commerce, mobile and automation

See my work

Works

A GitHub-first shortlist of strong projects from professional work, freelance delivery and private repositories. Each case highlights the technical context, stack and implementation decisions behind the work.

5 featured case studiesBackendCloud integrationsCommerce
ShopFusion Sales Dashboard cover

Independent Product

Full-stack Developer

GitHub Project2026

ShopFusion Sales Dashboard

Authenticated sales and e-commerce dashboard built with Next.js, Prisma, PostgreSQL and NextAuth.

Read technical case study

Next.js 16React 19TypeScriptPrisma+4
Talk2U Language Learning App cover

Talk2U Academy

Full-stack / Mobile Developer

Client Project2024

Talk2U Language Learning App

Language learning application for English, Spanish and French with gamified paths and Firebase-backed services.

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React NativeExpoFirebaseExpress.js+4
WhatsApp Business Webhook API cover

WebWhisper / WhatsApp Automation

Backend Developer

Client / Automation Project2024

WhatsApp Business Webhook API

Python webhook service for WhatsApp Business API chatbot automation.

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PythonFlaskWhatsApp Business APIWebhooks+1
ROI Manager cover

Independent Analytics Tool

Frontend / Product Developer

GitHub Project2024

ROI Manager

Deployed ROI management interface focused on tracking return, campaign performance and business metrics.

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JavaScriptNext.jsVercelDashboard UI+1
ASM Commerce Platform cover

Quality Digital / ASM

E-commerce Integration Developer

Professional Case Study2025-2026

ASM Commerce Platform

Private MedusaJS commerce platform split across backend, storefront and architecture/regionalization proof-of-concepts.

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MedusaJSNext.jsTypeScriptReact+5

Bio

1999Born in Itaiopolis (SC), Brazil

2018Started the Information Systems undergraduate program at the Federal University of Santa Catarina

2020Technical Support Intern at Nexxera
Worked with: Jira, Bash, SQL

2021Full-stack Developer Intern at Publya
Worked with: Flask, HTML templates, CSS, JavaScript, PostgreSQL

2021Full-stack Developer Jr. at Expertise Solutions
Worked with: NodeJS, NestJS, TypeScript, React, GraphQL, PostgreSQL, Kafka, TypeORM, Docker

2022Backend Developer at Keeps
Worked with: Django, Flask, Python 3, Jinja, SQLAlchemy, PostgreSQL, Docker, Pytest

2024Freelance Full-stack Engineer at 99Freelas
Worked with: SaaS platforms, API integrations, Meta Graph API, Google Ads API, JWT, Swagger, OAuth2

2025Full Stack Engineer at Quality Digital
Worked with: Node.js 22, TypeScript, AWS Lambda, DynamoDB, SQS, SNS, EventBridge, VTEX, Jest, Datadog

2025Solution Architect POCs for Brightdome / Fluidra
Worked with: Alokai, AEM Headless, MedusaJS, Stripe, Algolia, regionalization, headless commerce architecture

NowBuilding production-ready backend and infrastructure systems with Node.js, TypeScript, Python and AWS

I love

Gaming, Drawing, Playing Guitar, Skateboarding, Cybersecurity

On the web

© 2026 Rafael Nilson Witt. Software Engineer