Senior fullstack engineer with strong backend focus, building production-grade systems, internal platforms and SaaS products. Experienced in designing scalable architectures, integrations and AI-assisted systems with direct business impact.

• Senior Fullstack Engineer with backend-first mindset
• Strong mastery of TypeScript as a systems language
• Proven experience in application and system architecture
• End-to-end ownership: from design to production
• Frequent work on B2B, internal tools and government systems
• Engineering decisions driven by cost, risk and scalability

• Robust APIs and well-defined contracts
• Multi-tenant systems and RBAC
• Internal dashboards and admin panels
• Complex third-party integrations
• Operational automation through code (not low-code)
• Conversational systems using RAG (Retrieval-Augmented Generation)

Note: I have evaluated tools like n8n,
but do not use n8n in production systems.
I prioritize code-based solutions for versioning, control, predictability and long-term maintainability.

• Node.js · TypeScript
• NestJS · Express
• Python · GO
• tRPC · Server Actions
• PostgreSQL · Supabase · Firebase · MongoDB
• Redis · Webhooks · Queues
• Authentication, RBAC, Multi-tenancy

• Next.js
• React
• Tailwind CSS · Shadcn/UI

• Vercel
• Docker
• CI/CD pipelines
• Logging and observability

• RAG pipelines (document-grounded answers)
• LLM integrations for support and automation
• Knowledge base ingestion and retrieval control

Municipal and government-grade platforms

• Monitoring of corporate compliance and expiring documents
• Intelligent scheduling of inspections and support actions
• Internal-only, security-first systems
• Stack: TypeScript · Next.js · Supabase

Production-oriented conversational systems

• Strict knowledge-based responses (hallucination-resistant)
• File ingestion and semantic retrieval
• Full logging and traceability
• No unnecessary frontend — operations focused
• Stack: TypeScript · Backend-centric · RAG

🔗 https://agendasaas.renatosiqueira.dev
📦 https://github.com/RenatoSiqueira/AgendaSaas

• Online scheduling platform
• Google Calendar and Sheets integration
• Stack: Next.js · TypeScript · Tailwind CSS

• Pragmatic engineering decisions
• Clean, maintainable and scalable code
• Systems designed for change and growth
• Clear communication with product and stakeholders
• Strong focus on delivery and real-world constraints

• LinkedIn: https://www.linkedin.com/in/renatosiqueira/
• Email: renatoelysiqueira@gmail.com

Less hype. More systems that work in production.