Building the web,
one timezone at a time.
I'm Kayo Elias— an AI & software engineer from Rio de Janeiro, shipping AI agents, RAG systems, and polished web products for clients from Montréal to Rio.
based in Rio de Janeiro, Brazil · working worldwide · --:--:-- gmt-3
Trusted around the globe.
Every marker is a project shipped — from one of Canada's largest jewelry brands in Montréal to Brazil's financial markets authority in Rio. Remote-first since day one.
- 9+
- Companies served
- 4
- Countries
- 100%
- Remote
- Evry JewelsMontréal
- ANBIMABrazil
- Lumis ExperienceBrazil
- CCR · MotivaBrazil
- ReveloBrazil
- GDM SeedsBuenos Aires
- LevvaBrazil
- AGROPLAYBrazil
- OnQ RenovationsFort Walton Beach
drag to spin · hover a marker
Selected projects.
Products I founded, designed, and shipped end-to-end — from AI-powered personal finance to live-streaming tools.
CupCaky
Personal finance app with an active customer base — founder & builder. An LLM + RAG assistant over the user's financial data (pgvector), with MCP automations for categorization and insights.
Nyvo
Pix donation alerts for Brazilian livestreamers — real-time OBS alerts with Portuguese text-to-speech, fully customizable widgets, donor rankings, and on-screen Pix QR codes. Kick & Twitch, now in beta.
● Craft
Anyone can ship fast.
Shipping polished is the craft.
Tools I ship with.
A sharp, boring-on-purpose toolkit — chosen for speed, type safety, and long-term maintainability.
The road so far.
Sep 2025 — Present
Software Engineer · Levva
Remote
Own the React web and React Native mobile front-end for GDM Seeds, one of Latin America's largest seed companies — plus an AI agent that reads and analyzes logs to detect bugs automatically.
ReactReact NativeTypeScriptCQRSMay 2025 — May 2026
AI Training Engineer · Revelo
Brazil
Trained and evaluated frontier LLMs for software development — including Claude Opus — contributing datasets, RLHF-style feedback, and quality criteria that shaped widely adopted models.
LLM EvalsRLHFPrompt EngineeringJun 2025 — Sep 2025
Software Engineer · Lumis Experience
Brazil
Built and shipped to production the ANBIMA AI chatbot — RAG and semantic search with embeddings, pgvector, and reranking, in a regulated, high-stakes financial domain.
RAGpgvectorReactMay 2025 — Sep 2025
Tech Lead · AGROPLAY
Remote
Led the Ingressos Web ticketing platform — 1M+ tickets sold per event, Next.js SSR at scale, NestJS + Drizzle + PostgreSQL, and serverless architecture on AWS.
Next.jsNestJSDrizzleAWSDec 2024 — Mar 2025
Software Engineer · Evry Jewels
Montréal, Canada
Led from scratch the React Native app of one of Canada's largest jewelry brands — CMS-driven dynamic layouts with Sanity + Shopify, and a Python + PostgreSQL order backend.
React NativeSanityPythonFeb 2024 — May 2025
Software Engineer · iem IT
Brazil
Led the design system team for the CCR (now Motiva) app across React and React Native — composition-pattern architecture, code standards, and continuous distribution via Azure Artifacts.
Design SystemsReact NativeAzure2020 — 2024
Earlier roles · UDS · CSP Tech · Obra Show · Gtech
Brazil
Full-stack and front-end roles across agencies and product teams — React, React Native, Angular, WordPress, and everything the job called for.
ReactAngularWordPress
● Open source
934 contributions in the last year
● 05 — Contact
Let's build
something
great.
Have a project in mind, a role to fill, or just want to talk engineering? My inbox is always open.
Get in touch
[email protected]