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Software engineer with solid experience in Backend Python and .NET, Artificial Intelligence, and Web 3. Specialist in designing scalable architectures, implementing microservices, and deploying business-applied AI solutions. Proven track record in AWS infrastructure management (Terraform) and robust application security (Cloudflare), delivering clean, optimized code. Strong focus on technical excellence, design patterns, and measurable impact through performance optimization and secure cloud deployments. Experienced in distributed systems, messaging, caching, and production-grade development across ERP SaaS, web APIs, AI integrations, and smart contract development.…Software engineer with solid experience in Backend Python and .NET, Artificial Intelligence, and Web 3. Specialist in designing scalable architectures, implementing microservices, and deploying business-applied AI solutions. Proven track record in AWS infrastructure management (Terraform) and robust application security (Cloudflare), delivering clean, optimized code. Strong focus on technical excellence, design patterns, and measurable impact through performance optimization and secure cloud deployments. Experienced in distributed systems, messaging, caching, and production-grade development across ERP SaaS, web APIs, AI integrations, and smart contract development.

JOÃO VICTOR PONTES DE OLIVEIRA FAGUNDES

Back-End Developer, Web Developer, Programmer, +2

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Software engineer with solid experience in Backend Python and .NET, Artificial Intelligence, and Web 3. Specialist in designing scalable architectures, implementing microservices, and deploying business-applied AI solutions. Proven track record in AWS infrastructure management (Terraform) and robust application security (Cloudflare), delivering clean, optimized code. Strong focus on technical excellence, design patterns, and measurable impact through performance optimization and secure cloud deployments. Experienced in distributed systems, messaging, caching, and production-grade development across ERP SaaS, web APIs, AI integrations, and smart contract development.…Software engineer with solid experience in Backend Python and .NET, Artificial Intelligence, and Web 3. Specialist in designing scalable architectures, implementing microservices, and deploying business-applied AI solutions. Proven track record in AWS infrastructure management (Terraform) and robust application security (Cloudflare), delivering clean, optimized code. Strong focus on technical excellence, design patterns, and measurable impact through performance optimization and secure cloud deployments. Experienced in distributed systems, messaging, caching, and production-grade development across ERP SaaS, web APIs, AI integrations, and smart contract development.

Available to hire

Software engineer with solid experience in Backend Python and .NET, Artificial Intelligence, and Web 3. Specialist in designing scalable architectures, implementing microservices, and deploying business-applied AI solutions. Proven track record in AWS infrastructure management (Terraform) and robust application security (Cloudflare), delivering clean, optimized code.

Strong focus on technical excellence, design patterns, and measurable impact through performance optimization and secure cloud deployments. Experienced in distributed systems, messaging, caching, and production-grade development across ERP SaaS, web APIs, AI integrations, and smart contract development.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Beginner

Backendless

Beginner

Language

Portuguese

Fluent

English

Advanced

Work Experience

Solo Founder / Software Engineer

January 1, 2026 - Present

Bootstrapped and single-handedly built a proprietary multi-tenant ERP SaaS from scratch, delivering the full ecosystem: a high-conversion landing page, the core web platform, and a cross-platform mobile application. Designed an ultra-low-latency backend using an optimized Python (FastAPI) setup, ensuring API request processing in about 100ms. Implemented robust asynchronous processing with Celery, configuring dedicated workers for tenant-specific jobs such as automated billing and distributed tasks. Embedded AI capabilities to enhance automation, optimize scheduling, and provide intelligent CRM analytics for business owners. Managed the entire mobile application lifecycle and deployments using Expo to support automated review pipelines for Apple App Store and Google Play Store.

Backend Engineer at peck Finance

November 1, 2025 - Present

Owned the platform end-to-end architecture using Domain-Driven Design (DDD) principles for a .NET Web API. Defined database modeling and design patterns across the full-stack ecosystem. Improved performance by decreasing background request execution time by 96% (from >60s to ~2s) through refactoring and database pattern optimization. Architected and deployed production environments on AWS using Infrastructure as Code (Terraform). Implemented security and traffic management using Cloudflare Tunnels, WAF rules, and rate limiting. Orchestrated microservices for high scalability using Kafka for messaging and Redis for caching. Applied Web3 learnings in production for over two years and developed a Solidity-based smart contract to snapshot a user's financial portfolio for legal and tax reporting purposes.

Backend Developer at Intelegir

October 1, 2023 - November 1, 2025

Developed robust and scalable systems using Python with Django and FastAPI frameworks. Created and integrated generative AI features including chatbots and automated insight analysis using LangChain and Langflow. Engineered high-performance ETL pipelines and complex SQL architectures, optimizing large-scale data workflows and manipulating datasets at billion-row scale. Reduced ERP response times by 90% by re-architecting large monolithic payloads into efficient asynchronous sub-requests. Strengthened e-commerce infrastructure by identifying and neutralizing a critical storage bucket exploitation attempt to prevent potential data breaches. Designed internal technical architecture for company projects, leveraging Redis for caching and Elasticsearch for advanced search capabilities.