Freelance Backend Engineers in State of São Paulo

Freelance Backend Engineers in State of São PauloFreelance Backend Engineers in State of São Paulo

Projects People

Fernando Freitas

São Bernardo do Campo, Brazil

AI & ML Engineer | Full Stack, data-driven solutions expert

AI & ML Engineer | Full Stack, data-driven solutions expert

Cover image for Gmail AI | AI agent for email auto labeling

Gmail AI | AI agent for email auto labeling

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Cover image for 2048 | Full-stack replica in a web app

2048 | Full-stack replica in a web app

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12

Cover image for Copilot | AI assistant for data exploration

Copilot | AI assistant for data exploration

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11

Cover image for Insights AI | Web app for auto data analysis

Insights AI | Web app for auto data analysis

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13

Backend Engineer(2)

proSão Paulo, Brazil

Full-Stack Developer | Python, Automation & Data

New to Contra

Full-Stack Developer | Python, Automation & Data

Cover image for Rule-Driven Probability & Conditional Logic Calculator

Rule-Driven Probability & Conditional Logic Calculator

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3

Cover image for Automated Data Pipeline & Cloud Publishing Workflow

Automated Data Pipeline & Cloud Publishing Workflow

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0

Cover image for THE CHALLENGE
Client relationships become difficult

THE CHALLENGE Client relationships become difficult to manage when projects, conversations, account health, and revenue signals live in separate places. THE SOLUTION Clientio is a client management SaaS concept that gives teams one clear view of clients, active work, project health, timelines, and the next conversation. WHAT I BUILT • Client portfolio and health indicators • Project status, revenue, and timeline views • Central inbox and client activity feed • Responsive management dashboard • Clear information hierarchy for daily account work DESIGN APPROACH A bright blue workspace with warm orange highlights makes dense operational data approachable while preserving a confident professional feel. THE OUTCOME A polished CRM product demonstration combining product strategy, dashboard UX, visual design, and frontend engineering. LIVE PRODUCT https://clientio-saas-demo.almond-bowl-2897.chatgpt.site

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Cover image for THE CHALLENGE
Revenue teams lose momentum

THE CHALLENGE Revenue teams lose momentum when leads sit between a form submission, qualification, routing, and the next meaningful follow-up. THE SOLUTION Pipelin is a lead automation platform concept that captures, qualifies, and routes prospects without manual follow-up. It makes the flow of work visible from first signal to sales ownership. WHAT I BUILT • Visual lead-capture and routing workflow • Qualification rules with scoring thresholds • Automated welcome and nurture sequences • Real-time activity feed and pipeline analytics • Routing controls for market, company size, and priority • Responsive dark-mode SaaS dashboard DESIGN APPROACH A high-contrast operations interface uses deep navy, teal, and lime signals to make automation states, decisions, and performance easy to understand at a glance. THE OUTCOME A deployment-ready product demonstration combining workflow UX, data visualization, automation strategy, and frontend engineering. LIVE PRODUCT https://pipelin-automations-demo.almond-bowl-2897.chatgpt.site

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37

Backend Engineer(2)

Bruno Del Monde

Campinas, Brazil

Fullstack end-to-end solutions for your business

Fullstack end-to-end solutions for your business

Cover image for Not a Game: Turning Life into an RPG

Not a Game: Turning Life into an RPG

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10

Cover image for High-Performance Global Trade Engine

High-Performance Global Trade Engine

2

9

Cover image for Custom Medical Management: Rescuing 15 Years of Legacy Data

Custom Medical Management: Rescuing 15 Years of Legacy Data

2

14

Cover image for Hop Off: Systems Integration in a 3D Stealth Environment

Hop Off: Systems Integration in a 3D Stealth Environment

2

11

Backend Engineer(2)

André Felipe Rosa

São Paulo, Brazil

web develop build responsive and modern websites

New to Contra

web develop build responsive and modern websites

Cover image for Built an Educational SaaS MVP

Built an Educational SaaS MVP

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1

Cover image for AI Keyword Generator SaaS
A modern

AI Keyword Generator SaaS A modern

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1

Cover image for Task Management REST API
Developed a

Task Management REST API Developed a

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0

Cover image for FIVAM - Full Stack Frontend

FIVAM - Full Stack Frontend

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0

Backend Engineer(4)

Eduardo Batalha

São Paulo, Brazil

Creative Fullstack Engineer 🚀

Creative Fullstack Engineer 🚀

Cover image for Product Management API

Product Management API

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17

Cover image for Registration System

Registration System

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1

Cover image for Adress Info Verificator app

Adress Info Verificator app

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12

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Backend Engineer(2)

Henrique Oliveira Dos Santos

São Paulo, Brazil

Certified AWS Architect & DevOps Engineer

Certified AWS Architect & DevOps Engineer

Cover image for Programe.TECH

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15

Cover image for HenriqueOs98/-Haunted-House-Three.js

HenriqueOs98/-Haunted-House-Three.js

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30

Cover image for HenriqueOs98/sb-backend-challenge

HenriqueOs98/sb-backend-challenge

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11

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Backend Engineer(1)

Sorocaba, Brazil

Building AI Agents & SaaS with Next.js

8: Followers

Expert

Building AI Agents & SaaS with Next.js

Cover image for LeadInsights: Data Mining Tool (Developed

LeadInsights: Data Mining Tool (Developed in Replit) A Python-based lead qualification tool. The entire development lifecycle, from initial scripting to final debugging, was executed within the Replit cloud IDE. Replit Development Workflow: Zero-Setup Environment: Leveraged Replit's pre-configured Python environment to immediately start coding complex data processing scripts using pandas and BeautifulSoup without local dependency hell. Interactive Debugging: Utilized the Replit Shell heavily to run ad-hoc data scraping tests and inspect data frames in real-time before integrating them into the main application logic. Package Management: Managed Python dependencies directly through the Replit console, ensuring a reproducible development environment. Stack: Python, Pandas, Web Scraping Libraries (Developed directly in Replit).

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110

Cover image for BudgetCalc - Smart Project Estimator

BudgetCalc - Smart Project Estimator

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102

Cover image for Official Website: TENET AI (High-Conversion

Official Website: TENET AI (High-Conversion Landing Page) The public-facing portal and onboarding flow for the TENET AI ecosystem. Built with Replit: Rapid Prototyping: Used Replit's instant preview environment to iterate on the UI/UX design in real-time without local server setup. Frontend Performance: Optimized assets and code splitting directly within the Replit editor to ensure high Lighthouse scores. Zero-Config Dev: Leveraged Replit's pre-configured templates to jumpstart the development of the responsive layout. Stack: HTML5, Tailwind CSS, JavaScript (Developed in Replit).

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Cover image for SaaS Platform: TENET AI (Built

SaaS Platform: TENET AI (Built on Replit) A multi-tenant AI agent platform developed entirely within the Replit ecosystem. Replit-First Workflow: Cloud IDE: Used Replit as the exclusive environment to build complex Python/FastAPI microservices without local setup. AI Assisted: Leveraged Replit Ghostwriter to accelerate boilerplate generation for the multi-agent orchestration logic. Debugging: Utilized the Replit Shell for real-time testing of WhatsApp API webhooks before pushing to production. Stack: Python, FastAPI, PostgreSQL. (Production deployed via Railway, Development via Replit).

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132

Backend Engineer(2)

Felipe Silva Lima

São Paulo, Brazil

Fullstack Developer & UI/UX Designer

Fullstack Developer & UI/UX Designer

Cover image for D&D Adventure Manager App

D&D Adventure Manager App

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Cover image for RSVP Webapp for Wedding

RSVP Webapp for Wedding

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15

Cover image for Plataform for medical Staudies

Plataform for medical Staudies

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20

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Backend Engineer(1)