Raphael Serafim

Raphael Serafim

Toronto, Canada
Senior Software Developer
Full-Stack Developer TypeScript|
TypeScript Expert
Cloud-Ready Solutions
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Experienced Senior Developer focused on scalable web applications, real-time systems, and AI integrations. Strong background in TypeScript, Node.js, and cloud services, delivering solutions used by thousands of users daily.

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Google Cloud
Google SQL
AWS
Linux
Node.js
OpenAI
Contabo
Google Cloud
Google SQL
AWS
Linux
Node.js
OpenAI
Contabo

AI & Development Services

From AI agents and LLM integrations to full-stack web apps — the services businesses are hiring for, delivered worldwide in English and Portuguese.

AI Agents & Agentic Workflows

Autonomous AI agents and domain copilots that automate real work — one of the most in-demand services in 2026.

AI AgentsAgenticAutomation

Claude Code Development

AI-native developer tooling, automations and agents built with Claude Code and MCP.

Claude CodeAI-native

MCP Server Development

Model Context Protocol servers that connect your tools, APIs and data to AI assistants.

MCPIntegrations

RAG & Knowledge Assistants

Chatbots and assistants grounded on your own documents, data and knowledge base.

RAGChatbot

LLM Integration

Add AI to existing apps: chat, summarization, classification and extraction.

LLMOpenAIClaude

AI Automation

Automate customer service, sales and operations with intelligent workflows.

AutomationWorkflows

AI Chatbots (WhatsApp)

AI assistants for WhatsApp and Messenger that handle support, sales and scheduling 24/7.

WhatsApp APIChatbot

Web3 & Smart Contracts

Smart contract development and blockchain integration — experience with decentralized apps, wallets and on-chain systems (EVM / Blast network).

Smart ContractsBlockchainWeb3

Full-Stack Web & APIs

Scalable web apps, SaaS, REST APIs and integrations with React, Next.js, Node.js and AWS.

ReactNext.jsNode.js

Education

Bachelor's Degree in Information Systems

Jan 2017 - Dec 2020
UNIFAMA•Brazil

Comprehensive study of information systems, software engineering, and business integration

Professional Experience

Senior Software Developer

Lysterium

February 2025 - June 2025
Toronto, Canada

Developing and maintaining full-stack web applications using PHP, Node.js, and React.js. Leading complex software solutions with focus on performance optimization.

Currently working on cutting-edge projects
Implementing modern development practices
Contributing to scalable architecture design

Software Developer

CJ Technologies

April 2023 - October 2024
Toronto, Ontario, Canada

Focused on cryptocurrency and decentralized gaming on the Blast network. Developed full-stack applications and blockchain integrations.

Optimized database queries enhancing performance and scalability
Automated CI/CD pipelines minimizing downtime across production environments
Integrated RESTful APIs connecting front-end with blockchain components
Implemented blockchain wallet functionality for decentralized gaming platforms

Full Stack Developer

CACHE SISTEMAS

December 2017 - November 2022
Guarantã do Norte, Mato Grosso, Brasil

Designed and developed custom software solutions, APIs and web systems. Led banking integrations and digital signature systems.

Led Sicredi bank integration for online student fee invoices
Developed digital signature system for academic re-enrollment
Created custom WordPress plugins and themes
Streamlined complex data migration workflows with automated scripts

Military Service

Brazilian Air Force - FAB

January 2013 - December 2015
Brazil

Conducted state intelligence analysis and integration. Worked on technology-driven projects enhancing military operations.

Developed technology solutions for military operations
Gained experience in critical systems and security protocols
Enhanced analytical and problem-solving skills

Key Projects & Expertise

API Sicredi PIX

2024

PHP PIX Integration

ID: github.com/raphaelvserafim/api-sicredi-pix

World Of Blast (WOB)

2024

Blockchain Development

ID: Smart Contract & DeFi Platform

WhatsApp API Client

2024

Real-time Messaging

ID: github.com/raphaelvserafim/client-php-api-wa-me

AI Integration Projects

2024

Artificial Intelligence

ID: Python Flask & Hugging Face API

Core Technologies

Languages & Frameworks

PHPNode.jsReact.jsReact NativePythonTypeScriptJavaScript

Databases & Tools

MySQLSQLGitDockerFirebaseLinuxWordPress

Specializations

BlockchainCryptocurrencyAI IntegrationCI/CD

Highlighted Projects

API Sicredi PIX

PHP library for Sicredi PIX integration: create charges and receive real-time payment notifications

PHPSicredi PIXWebhooks
16
3
Active

client-php-api-wa-me

Unofficial PHP client for WhatsApp API (api‑wa.me): send messages, manage groups and receive events

PHPWhatsApp APIWebhooks
11
9
Active

chatbot-gpt-whatsapp

WhatsApp chatbot in PHP integrating OpenAI GPT for conversational AI responses

PHPOpenAI GPTWhatsApp API
6
0
Active

base-server‑ts

TypeScript boilerplate for building REST API servers with Express.js and PostgreSQL

TypeScriptExpress.jsPostgreSQL
0
0
Active

Open to Opportunities

Looking for challenging roles in product-focused teams where I can contribute to scalable architecture, performance optimization, and intelligent automation.

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Available for Hire
Full-Stack Developer
Cloud & AI Experience