Freelance Software Engineers in São PauloFreelance Software Engineers in São Paulo
ProjectsPeople
Cristian Anterio's avatar
Cristian Anterio
São Paulo, Brazil
Skilled Software Engineer ready to build you next web app
5.0
Rating
25
Followers
Skilled Software Engineer ready to build you next web app
Cover image for FairRate: AI-Powered Pricing Estimation Tool for Freelancers
FairRate: AI-Powered Pricing Estimation Tool for Freelancers
0
4
Cover image for Hey all! Me again :) This time, I'm building something for o...
Hey all! Me again :) This time, I'm building something for our health 💪. We all love the freedom of freelancing, but it's too easy to forget to take breaks and move our bodies. That's why I'm using Builder to create a simple app that times our work sessions and reminds us to take healthy breaks with guided stretches. It's all about working smarter without forgetting to take care of ourselves! What do you think? 😁
2
29
444
Cover image for Hey everyone! I’ve been experimenting with a small AI-powere...
Hey everyone! I’ve been experimenting with a small AI-powered tool for freelancers and I’d love your feedback! 👉 FairRate – Smart Pricing for Freelancers (https://studio--studio-467457356-8d2ad.us-central1.hosted.app/) It’s a simple proof of concept that helps you estimate a fair rate for any job — just paste a project description, choose your experience level and region, and the AI gives you a price range with a short explanation. I built it to solve something I often see here on Contra and among other freelancers that are unsure how much to charge for new projects. I’d love to know what you think, what works, what doesn’t 👀, what could be better. If you have a minute, play around with it, and please drop any feedback or ideas in the comments (is it realistic? not even close?)!
9
23
307
Cover image for I recently built a landing page for a law firm — but it’s no...
I recently built a landing page for a law firm — but it’s not just a landing page. It’s a way to connect real people with real legal solutions 🤝 . Every section was designed to build trust, highlight expertise, and guide visitors toward what truly matters: solving their problems. Because in the end, great design isn’t only about looks — it’s about creating meaningful connections between professionals and the clients who need them most. If you’re ready to turn your services into something people can feel and trust, let’s talk.
18
235
Software Engineer(5)
Arthur Ziero's avatar
Arthur Ziero
São Paulo, Brazil
🚀 Software Development & Enterprise Applications
5.0
Rating
6
Followers
🚀 Software Development & Enterprise Applications
Cover image for ToFans | Fullstack Web Development
ToFans | Fullstack Web Development
0
16
Cover image for Rolezou | Fullstack Mobile Development
Rolezou | Fullstack Mobile Development
0
21
Cover image for YASQ | Fullstack Web Development
YASQ | Fullstack Web Development
0
19
Cover image for Klin | Custom Enterprise Application
Klin | Custom Enterprise Application
0
36
Software Engineer(3)
Heber Conrado's avatar
Heber Conrado
São Paulo, Brazil
n8n Automation & AI Workflows for Growing Businesses
New to Contra
n8n Automation & AI Workflows for Growing Businesses
Cover image for N8N HR Document Automation Flow
N8N HR Document Automation Flow — Portfolio Explanation Overview This workflow automates the process of onboarding new employee files into an organized Google Drive structure. Whenever a new file is uploaded to Drive, the system automatically identifies the employee, validates them against a roster, notifies them by email, and logs everything — all without any manual intervention. Integrations Used IntegrationPurposeGoogle DriveDetects new files and moves them to the correct folderGoogle SheetsStores the employee registry for lookupGmailSends notifications and admin alertsN8N Code NodeExtracts and parses data from the file Flow Breakdown 1. Trigger — New File on Drive Novo Arquivo no Drive The flow is triggered automatically whenever a new file is created in a monitored Google Drive folder. This is the entry point — no manual action needed. 2. Extract Name & Data from File Extrair Nome e Dados do Arquivo A Code node parses the uploaded file to extract key information — primarily the employee's name and any relevant metadata embedded in the file name or content. 3. Search Employee in Spreadsheet Buscar Funcionário na Planilha Using the extracted name, the flow queries a Google Sheets spreadsheet (the employee registry) to check whether this person exists in the system. 4. Employee Found? (Conditional Branch) Funcionário Encontrado? A Switch/Router node evaluates the lookup result and splits the flow into two paths: ✅ Path A — Employee Found (True) StepActionMove to Employee FolderThe file is moved to that employee's dedicated Google Drive folderNotify Employee by EmailA Gmail message is sent to the employee confirming the file was receivedSuccess LogA record is written to a Google Sheets log (append/update) ❌ Path B — Employee Not Found (False) StepActionError LogThe failed attempt is recorded in a separate Google Sheets error logAlert Admin by EmailGmail sends an alert to the administrator reporting the unrecognized file Key Features ✅ Fully automated — triggered by file upload, zero manual steps ✅ Smart file routing — files land in the right employee folder automatically ✅ Validation layer — cross-references a live employee spreadsheet before acting ✅ Dual-path error handling — failures are logged and the admin is immediately notified ✅ Audit trail — both successes and errors are recorded in Google Sheets ✅ Email notifications — employees and admins are kept in the loop automatically
0
16
Cover image for N8N WhatsApp AI Agent Flow
N8N WhatsApp AI Agent Flow — Portfolio Explanation Here's a clear breakdown of your automation workflow for your portfolio:
1
75
Cover image for Kinetic Dashboard — SaaS Front-End
Kinetic Dashboard — SaaS Front-End Experience Kinetic Dashboard is a high-performance front-end built for modern SaaS applications, focused on usability, scalability, and real-time data-driven decision making. This project was developed using solid engineering and product design principles, delivering a smooth, intuitive, and highly responsive user experience. 🔹 Key Features & Strengths 1. Modern data-driven UI/UX Clean and professional interface with clear visual hierarchy, making it easy to analyze critical metrics such as performance, workflows, and operational insights. 2. Scalable architecture (SaaS-ready) Built to scale, enabling seamless integration with multiple services, APIs, and environments (multi-region and multi-tenant ready). 3. Optimized performance Fast rendering, reusable components, and efficient state management ensure smooth performance even with large data volumes. 4. Consistent Design System Standardized visual patterns (colors, typography, spacing, components) for easier maintenance and long-term product evolution. 5. Executive dashboard focus Strategic data visualization with clear KPIs, trend indicators (↑ ↓), and quick insights for decision-making. 6. User-centered experience Intuitive navigation with a structured sidebar, visual feedback (status, alerts, progress), and quick actions like report export. 7. Compliance-ready (GDPR & UX best practices) Includes essential components such as cookie consent and privacy-focused UX for global applications. 8. Modular and reusable components Well-structured component system that simplifies maintenance, testing, and scalability. 💡 Technologies & Best Practices Component-based architecture API integrations Fully responsive design Clean Code principles Accessibility and readability focus 🚀 Outcome A robust, elegant, and production-ready SaaS dashboard, ideal for companies that need to monitor operations, workflows, and performance in real time with clarity and efficiency. If you're looking for a professional SaaS front-end focused on performance, scalability, and user experience, Kinetic Dashboard represents the level of quality I deliver. Link - kinetic-dashboard-hmdphc48w-heberconrado-4074s-projects.vercel.app (https://kinetic-dashboard-hmdphc48w-heberconrado-4074s-projects.vercel.app)
0
35
Cover image for N8N WhatsApp Financial Bot —
N8N WhatsApp Financial Bot — Portfolio Explanation Overview This workflow is a WhatsApp-based personal finance bot built in N8N. Users interact with it by sending text commands directly via WhatsApp, and the bot responds with debt tracking, income recording, and financial reports — all stored in a PostgreSQL database. Integrations Used IntegrationPurposeEvolution API + WhatsAppReceives and sends WhatsApp messagesPostgreSQLStores debts, income records, and financial dataN8N Code NodesParses commands and formats responsesWebhookEntry point for incoming messages Flow Breakdown 0. Setup — Create Tables Criar tabelas (executar 1x) A one-time PostgreSQL node that creates the necessary database tables before the flow goes live. Run once during setup. Webhook (Entry Point) Webhook Configured with the Evolution API to receive all incoming WhatsApp messages via HTTP POST. Setup requires pointing the Evolution instance's Webhook URL to this node and subscribing to the messages.upsert event. Extract Message Extrair mensagem A Code node reads the Evolution API's JSON payload and extracts: The message text (lowercased) The sender's phone number The sender's name from WhatsApp Security Filter — My Number Only Filtro — só meu número A security gate that only allows messages from the owner's own number to proceed. Any message from an unknown number is silently ignored and a 200 OK is returned to avoid retries. Switch — Command Detection Switch — comando Routes the flow based on the command detected in the message: CommandActionmenuShows the options menudividaDebt registration flowrecebiIncome registration flowrelatorioFinancial report flow(anything else)Fallback / ignored Menu Menu Montar Generates and sends a formatted options menu to the user via WhatsApp, listing all available commands with usage examples. Parse Debt Command Parsear dívida Extracts structured data from the /divida command. Expected format: /divida [name] [value] Parse Income Command Parsear receber Extracts structured data from the /recebi command. Expected format: /recebi [name] [value] 8 & 9. Save to PostgreSQL Salvar dívida / Salvar receber Inserts the parsed debt or income record into the PostgreSQL dividas table, using the configured financial database credentials (host, port, database, user, password). Fetch Report Buscar relatório Runs a PostgreSQL query that returns a financial summary including: Total debts per person Total income received per month Breakdown by fortnight (installment periods) 11a/b/c. Format Messages Formatar mensagens / Confirmar dívida / Confirmar receber / Formatar relatório Three formatting nodes — one per command path — that shape the response into WhatsApp-friendly Markdown (bold, line breaks, currency formatting like R$ 1.000,00). Send WhatsApp Response Enviar WhatsApp Sends the formatted reply back to the user via the Evolution API HTTP endpoint: POST http://{SEU_HOST}/message/sendText/{INSTANCE} with the API key in the request header. Respond to Webhook Responder ao Webhook Returns an HTTP 200 response to the Evolution API to confirm the message was successfully processed and prevent retry loops. Available Commands (User-Facing) CommandDescription/menuShows all available commands/divida [name] [value]Registers a debt owed to you/recebi [name] [value]Logs a payment received/relatorioGenerates a full financial summary report Key Features ✅ WhatsApp-native interface — no app needed, just chat commands ✅ Owner-only security filter — private and protected by default ✅ Multi-command routing — clean switch logic for each feature ✅ PostgreSQL persistence — all financial data stored reliably ✅ Formatted reports — human-readable summaries with WhatsApp Markdown ✅ Webhook handshake — proper HTTP 200 handling to prevent duplicate triggers ✅ Zero UI required — fully operated through natural WhatsApp messages
0
13
Software Engineer(3)
Felipe Brigatto's avatar
Felipe Brigatto
São Paulo, Brazil
Backend Software Engineer with Python experience
Backend Software Engineer with Python experience
Cover image for Homepage for a Card Game company that organizes tournaments ...
Homepage for a Card Game company that organizes tournaments and is thriving to create their own system
0
22
Cover image for Stuna is a specialized platform built to organize, connect, ...
Stuna is a specialized platform built to organize, connect, and empower the vibrant and rapidly growing manga-collecting community in Brazil. Unlike traditional markets, Brazilian manga culture is deeply shaped by diversity: from regional publishing differences to unique release schedules, limited-edition prints, and small specialized retailers spread across the country. Collectors often struggle with fragmented availability, inconsistent stock, and the difficulty of finding specific volumes, especially from older or niche series. Stuna solves this by unifying collectors, local comic shops, and distributors into a single intelligent ecosystem. Through demand tracking, pre-order management, and community-driven inventory insights, Stuna makes collecting Brazilian manga easier, more organized, and more accessible.
25
319
Cover image for Simple and clean website for a Tech Consultant with public p...
Simple and clean website for a Tech Consultant with public projects on spot
1
26
Cover image for Seamless creating of PWA and published to Play Store! A djan...
Seamless creating of PWA and published to Play Store! A django project using no framework of javascript, was successfully transitioned to PWA! The behaviour is different between browser and PWA, so needing to modify nothing on the frontend was a great achievment!
1
40
Software Engineer(2)
Henrique Oliveira Dos Santos's avatar
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
0
5
Cover image for HenriqueOs98/-Haunted-House-Three.js
HenriqueOs98/-Haunted-House-Three.js
0
27
Cover image for Programe.TECH
Programe.TECH
0
10
Placeholder project card media
View more →
Software Engineer(1)
Thiago Santana's avatar
Thiago Santana
Barueri, Brazil
Expert Software Developer: Elevating Your Business
Expert Software Developer: Elevating Your Business
Cover image for Health-ERP App for Health Tech Company
Health-ERP App for Health Tech Company
0
3
Cover image for Open Insurance Brazil - Quote Patrimonial API Implementation
Open Insurance Brazil - Quote Patrimonial API Implementation
0
26
Cover image for Golang Fibonacci REST API
Golang Fibonacci REST API
0
6
Cover image for mock-services
mock-services
0
1
Software Engineer(1)
Bruno Gomes's avatar
Bruno Gomes
State of São Paulo, Brazil
Senior Fullstack Engineer
Senior Fullstack Engineer
Cover image for Magnetis - Fullstack developer | Tech lead
Magnetis - Fullstack developer | Tech lead
0
9
Cover image for Tunelark
Tunelark
0
14
Cover image for Bipa
Bipa
0
3
Placeholder project card media
View more →
Software Engineer(2)