Freelancers using Python in São Bernardo do Campo

Freelancers using Python in São Bernardo do CampoFreelancers using Python in São Bernardo do Campo

Projects People

São Paulo, Brazil

AI Engineer | Agents, Automation & Integrations

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AI Engineer | Agents, Automation & Integrations

Cover image for I'm currently building Omnicrm.chat (http://OmniCRM.chat).

I'm currently building Omnicrm.chat (http://OmniCRM.chat). A CRM and multichannel communication platform designed to keep customer conversations, sales opportunities, and operational workflows in a single workspace. Most teams still manage WhatsApp, Telegram, email, proposals, tasks, and customer records across multiple disconnected tools. The result is lost context, duplicated work, and a fragmented customer experience. With OmniCRM.chat (http://OmniCRM.chat), conversations can evolve into opportunities, projects, and tasks without manual data entry. The goal is to connect communication, CRM, and execution into one platform, while creating a foundation for future AI-driven automation across the entire customer lifecycle.

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Cover image for App name: WeeklyMind

Category: lifestyle

An AI-powered

App name: WeeklyMind Category: lifestyle An AI-powered weekly planning app that helps users organize routines, goals, habits, and schedules through natural conversations. Users can talk with the AI about work, health, focus sessions, and personal balance, while the assistant automatically creates tasks, goals, and smart weekly plans in a calm and minimal mobile experience. Branch vision ID version test : https://weeklymind.bubbleapps.io/version-test/api/1.1/mobile/preview?debug_mode=true&preview_view=Home

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Cover image for AI-Powered OCR Pipeline for Document Processing

Most OCR systems stop at text extraction. The real value starts after the document is read. In this project, I built an AI-powered OCR pipeline capable of extracting text from invoices, contracts, reports, and forms while also classifying the document type and identifying key information automatically. Instead of returning raw text only, the system structures the data into usable outputs for automation workflows, CRMs, ERPs, and AI agents. This reduces manual processing time and makes documents immediately actionable inside business operations. The stack combines OCR engines with LLM-based processing for contextual understanding, keyword extraction, and intelligent classification. The result is a more reliable document processing flow that can integrate directly with APIs, databases, and automation systems. This is where AI engineering becomes practical: transforming unstructured files into structured business data at scale

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Cover image for Intelligent AI Agent for Business Automation

Most businesses are already experimenting with AI — but very few are using it the right way. A generic chatbot is not enough. What actually drives value is a custom AI agent built around your workflows, capable of calling APIs, automating decisions, and integrating directly with your systems. This is where AI stops being a demo and starts becoming infrastructure. With the right architecture, your AI can handle operations, reduce manual work, and scale processes without increasing costs — from customer support to internal tools, data processing, and beyond. If you're thinking about building a real AI solution tailored to your business, let’s talk.

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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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Cover image for Automated Data Pipeline & Cloud Publishing Workflow

Automated Data Pipeline & Cloud Publishing Workflow

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Cover image for Responsive Multilingual Analytics Dashboard

Responsive Multilingual Analytics Dashboard

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Cover image for PewStats is a custom football

PewStats is a custom football analytics platform I developed to automate data collection, processing, and statistical analysis. It provides team statistics, match insights, comparisons, trends, and custom analytical tools through an intuitive web interface. The project combines Python automation, data processing, APIs, and full-stack web development.

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Guilherme Farinassi

São Paulo, Brazil

Penetration Tester & Security Researcher | Web, Mobile & API

New to Contra

Penetration Tester & Security Researcher | Web, Mobile & API

Cover image for Bug Bounty Research - Web

Bug Bounty Research - Web Vulnerability Discovery Conducted independent bug bounty research on public VDP and paid programs (Bugcrowd/HackerOne). Discovered and reported multiple valid vulnerabilities including IDOR exposing PII, stored XSS in user-controlled fields, SSRF via internal metadata endpoint, authentication bypass via JWT manipulation, and sensitive data exposure through misconfigured S3 buckets. Findings spanned government agencies, SaaS platforms, and financial services targets. Documented all findings with full reproduction steps, CVSS scoring, and business impact analysis following responsible disclosure guidelines.

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Cover image for API Security Assessment - REST

API Security Assessment - REST and GraphQL Endpoints Performed a black-box API security assessment covering REST and GraphQL endpoints for a fintech platform. Identified BOLA/IDOR vulnerabilities allowing unauthorized access to other users financial data, mass assignment flaws exposing admin-only fields, broken function-level authorization on privileged endpoints, and GraphQL introspection exposing internal schema. Also found SSRF via webhook URL parameter and JWT algorithm confusion (RS256 to HS256). Delivered OWASP API Top 10 aligned report with curl-based PoC for each finding and remediation guidance.

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Cover image for Mobile Application Pentest - Android

Mobile Application Pentest - Android Banking App Conducted a full black-box mobile penetration test on an Android banking application following OWASP MASTG methodology. Identified 17 vulnerabilities including 5 critical findings: hardcoded AES encryption keys in SharedPreferences, SSL pinning bypass via Frida instrumentation, root detection bypass via LIEF binary patching, exported Activities without permission checks, and sensitive data exposed in Logcat. Delivered MASTG-aligned report with CVSS scoring and PoC code for all critical findings.

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Cover image for Web Application Pentest — Insurance

Web Application Pentest — Insurance Portal Conducted a full black-box web application penetration test on an insurance client portal. Identified 11 vulnerabilities including 3 critical findings: unauthenticated access to customer PII (CPF, phone, address), broken authentication allowing account takeover, and exposed debug endpoints with Facelets stack traces. Delivered a structured report with CVSS scoring, PoC for each finding, and prioritized remediation guidance. All critical findings were reproduced and confirmed in a retest cycle. Stack targeted: Java EE, REST APIs, JWT auth, LGPD-sensitive data.

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Henrique Oliveira Dos Santos

São Paulo, Brazil

Certified AWS Architect & DevOps Engineer

Certified AWS Architect & DevOps Engineer

Cover image for HenriqueOs98/sb-backend-challenge

HenriqueOs98/sb-backend-challenge

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

HenriqueOs98/-Haunted-House-Three.js

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Cover image for Programe.TECH

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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 Insights AI | Web app for auto data analysis

Insights AI | Web app for auto data analysis

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Cover image for Copilot | AI assistant for data exploration

Copilot | AI assistant for data exploration

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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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São Paulo, Brazil

Crio sites, apps e designer profissionais para seu negócio

Crio sites, apps e designer profissionais para seu negócio

Cover image for I designed the UI and user experience for +Saúde, a wellness...

I designed the UI and user experience for +Saúde, a wellness app focused on healthy habits, daily progress, and personal care. The project includes: ✨ Gamified daily goals ✨ XP, levels, and rewards system ✨ Clean and intuitive dashboard ✨ Appointments, digital ID card, and medication tracking ✨ Modern and minimal UI built for everyday usability Each screen was crafted with clarity, motivation, and user-friendly interaction in mind, delivering a functional and engaging experience. If you need app design, professional UI/UX, or a complete modern interface for your project, I’m open to new collaborations.

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Cover image for I recently worked on several image retouching and visual enh...

I recently worked on several image retouching and visual enhancement projects, transforming raw photos into clean, sharp, and highly attractive visuals for different types of businesses. My work included: ✨ Color correction ✨ Lighting adjustments ✨ Sharpness and detail enhancement ✨ Background cleaning ✨ Product highlighting ✨ Professional finishing for ads and menus High-quality images significantly increase customer engagement and brand credibility — especially for food businesses, online stores, and visual branding. If you need professional photo retouching, image enhancement, or product visuals that really stand out, I’m open to new projects. 🚀

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Cover image for I worked on premium visual identity projects for brands like...

I worked on premium visual identity projects for brands like Liora Beauty and Up Sellers Studio, creating logos, color palettes, branded materials, and high-end mockups. My focus was to build a modern, elegant, and high-value aesthetic — the kind of visual identity that elevates brand presence both online and offline. If you need a strong, sophisticated, and sales-driven brand identity, I’m open to new projects.

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Cover image for I developed a collection of premium visual identities, inclu...

I developed a collection of premium visual identities, including modern logo design, exclusive brand symbols, and sophisticated branding concepts. I also created elegant, clean website layouts focused on strong visual presence and high conversion. Each project was crafted with attention to detail, visual harmony, and brand purpose — delivering strong, memorable identities ready to stand out in the market. If you need a professional logo, a complete visual identity, or a premium-looking website, I'm open to new projects.

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proSão Paulo, Brazil

AI automation — n8n, WhatsApp bots, Claude & RAG

New to Contra

AI automation — n8n, WhatsApp bots, Claude & RAG

Cover image for LLM Data Pipeline — Python + Claude

LLM Data Pipeline — Python + Claude

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Cover image for Lead-Gen Pipeline — 6 n8n Workflows in Production

Lead-Gen Pipeline — 6 n8n Workflows in Production

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Cover image for Raio-X Operacional — AI-Personalized Quiz Funnel

Raio-X Operacional — AI-Personalized Quiz Funnel

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Cover image for Luísa — AI Customer Service Agent with RAG

Luísa — AI Customer Service Agent with RAG

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Sharles Maurício Mariano

São Paulo, Brazil

Experienced in coding, data analysis, Power BI and Excel

Experienced in coding, data analysis, Power BI and Excel

Cover image for A2INET – Alzheimer’s Disease MRI Classification

A2INET – Alzheimer’s Disease MRI Classification

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Cover image for ADNI CNN Dense Classifier

ADNI CNN Dense Classifier

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Cover image for Personality Type Mapping with Machine Learning

Personality Type Mapping with Machine Learning

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