I design and deliver secure, scalable, and intelligent software, from distributed backend systems to end-to-end applications.

📍 Based in Florianópolis, Brazil
🌎 Open to remote opportunities worldwide
🏢 Available for hybrid or on-site roles in Greater Florianópolis

I am a Software Engineer with more than four years of professional experience building secure, scalable, and resilient software solutions.

My experience spans backend systems, full-stack applications, cloud-native architectures, Data Security, financial technology, asynchronous processing, SaaS platforms, and Applied AI.

I have developed microservices and distributed systems using Go and Python, end-to-end applications using Java, Spring Boot, Vue, React, TypeScript, and Node.js, and cloud solutions running on AWS and Google Cloud.

My Applied AI experience includes LLM agents, LangGraph, OpenAI and Anthropic models, RAG, pgvector, semantic search, Prompt Engineering, and LLM evaluation.

At Mercado Livre, I expanded Data Security coverage to approximately 90% of internal storage technologies and improved sensitive-data detection and classification rules to approximately 90% accuracy.

I am currently pursuing an MBA in Software Engineering with Artificial Intelligence.

• 💻 Software Engineering: System design, clean code, automated testing, code reviews, and reliable production systems.
• 🐹 Backend Systems: Go, Python, FastAPI, microservices, REST APIs, gRPC, and distributed processing.
• 🌐 Full Stack Applications: Java, Spring Boot, Vue, React, TypeScript, Node.js, authentication, state management, and API integration.
• ☁️ Cloud Engineering: AWS, Google Cloud, Docker, Kubernetes, Terraform, serverless, and cloud-native architectures.
• 📨 Event-Driven Systems: AWS SQS, Pub/Sub, Cloud Tasks, Redis Streams, workers, retries, idempotency, and DLQs.
• 🤖 Applied AI: OpenAI, Anthropic, LangGraph, LLM agents, RAG, pgvector, Prompt Engineering, and model evaluation.
• 🔒 Data Security: LGPD, tokenization, cryptography, hashing, masking, governance, and access control.
• 📊 Observability: Structured logs, metrics, dashboards, production alerts, Datadog, and Kibana.

February 2026 - April 2026

• Designed and developed Go microservices for tokenization of cards and investment products.
• Built REST APIs for internal services, financial integrations, and legacy platforms.
• Implemented asynchronous processing using AWS SQS.
• Worked with PostgreSQL, Docker, automated tests, incident investigation, and bug fixing.

July 2025 - January 2026

• Developed a production multi-tenant SaaS platform using Python, FastAPI, PostgreSQL, and Google Cloud Run.
• Built AI-agent pipelines using LangGraph and OpenAI and Anthropic models.
• Implemented RAG using PostgreSQL, pgvector, document ingestion, and semantic search.
• Integrated Meta WhatsApp API, Gmail API, and the Asaas payment gateway.
• Implemented distributed processing with Cloud Tasks and Pub/Sub.
• Applied idempotency and soft-lock patterns to prevent duplicate processing.
• Evaluated LLM models to optimize cost, response quality, and reliability.

May 2022 - June 2025

• Developed and maintained Go microservices for security, governance, and sensitive-data protection.
• Expanded Data Security coverage to approximately 90% of internal storage technologies.
• Improved sensitive-data detection and classification rules to approximately 90% accuracy.
• Built secure REST APIs using cryptography, hashing, masking, tokenization, and access control.
• Created production dashboards, structured logs, metrics, and alerts using Datadog and Kibana.
• Participated in on-call rotations, incident investigation, code reviews, and automated testing.
• Contributed to internal experiments involving corporate LLMs.

• MBA in Software Engineering with Artificial Intelligence | FullCycle | In progress
• Go Expert | FullCycle
• Web Full Stack Development | Trybe
• Web Full Stack Development | Digital House
• Business Administration | Estácio de Sá

• Portuguese: Native
• Spanish: Advanced
• English: Intermediate, including technical reading and documentation

I am open to Software Engineer opportunities involving backend development, full-stack applications, cloud engineering, distributed systems, Data Security, financial technology, or Applied AI.

I am available for remote opportunities worldwide. For hybrid or on-site positions, I am available throughout Greater Florianópolis.

• LinkedIn: linkedin.com/in/leandropiassetta
• Email: [email protected]