Senior Full-Stack & AI Engineer · Brazil
7+ years owning multi-tenant SaaS platforms, AI-driven workflows, and the cloud infrastructure that runs them — from the React frontend down to the VPS. Currently CTO at ShallomTEC.
I'm Renato Siqueira, a senior full-stack engineer in Ananindeua, Pará, Brazil. For 7+ years I've owned products from the first architecture decision to the VPS they run on — React and Next.js on the front; Node, NestJS, Python and Go on the back; and, increasingly, an AI layer on top.
Today I'm CTO at ShallomTEC, where I design multi-tenant SaaS, ship AI-driven workflows, and self-host the infrastructure behind it all with Docker, Traefik and Dokploy. I've also mentored hundreds of developers along the way.
Full-stack ownership of each: product, architecture, code, deploy and the VPS.
SaaS platform for link management — branded short links, styled QR codes and link-in-bio pages managed from a single dashboard. Click analytics by geography, device, browser and referrer, plus smart routing by country and OS, password protection, expiry rules, team permissions and a REST API with webhooks.
Multi-tenant SaaS modernizing citizen services for the public sector — e-protocols, online scheduling, queue management, digital certificates, a service chatbot and satisfaction surveys in one system. Real-time dashboards give agencies operational visibility, built to scale across departments and administrative units.
Institutional site & digital platform for an integrative-medicine clinic — built around humanized, preventive care. Specialties, brand storytelling, SEO and WhatsApp booking, engineered end-to-end for performance and patient conversion.
Multi-tenant SaaS for indoor digital signage — manage networks of screens remotely and in real time. Schedule playlists and campaigns, push content to players and monitor every device from one admin dashboard, built to scale across high-availability display networks.
AI platform for law firms — RAG connects the firm's own contracts, briefs and internal docs to an LLM for contextual, source-grounded answers. A natural-language chat cuts document-research time so lawyers reply to clients faster, without giving up legal oversight.
SaaS platform for tech-support & field-service operations — tickets, work orders, equipment inventory and contracts in one place. Real-time ticket tracking, auto-generated PDF service orders and per-client asset control give MSPs and support teams full operational visibility.
SaaS platform for the full lifecycle of digital certificates — centralizes issuance, expiry, renewals and related documents. Admin dashboards plus automated expiry alerts cut operational risk for companies and IT teams, in a secure, intuitive experience.
Leading engineering and architecture: multi-tenant SaaS products, AI-driven workflows, and the self-hosted infrastructure running them — Docker, Traefik, Dokploy and Supabase on a managed VPS.
Architected 4 major products including a multi-tenant multimedia platform (React, GraphQL, AWS) and a Next.js CMS. Built an end-to-end generative-AI workflow (Next.js + Python/FastAPI), a cross-device playback-progress service, and a browser-based live broadcast studio over a real-time video SDK.
Co-built a SaaS platform from scratch (Next.js, NestJS, GraphQL). Integrated fiscal/invoicing systems, postal services and messaging via secure webhooks, with JWT auth and hardened architecture.
Mentored hundreds of developers through the Fullstack Master and DevReactJS programs — from fundamentals to architecture and deployment — with rigorous code reviews and clean-code practice.
Co-founded a tech firm delivering full-stack solutions across desktop, web and mobile, plus Asterisk/VoIP call-center servers and Linux infrastructure — owning the full lifecycle and client relationships.
From idea to production — frontend, API, database and deploy, owned end to end.
Generative-AI workflows, prompt engineering and AI agents that automate real work.
Multi-tenant platforms designed for data isolation, scale and performance.
Docker, Traefik, Dokploy and VPS setups — reliable infrastructure without the cloud bill.
Architecture decisions, code review and mentoring that level up the whole team.