System Status
Character sheet> SYSTEM STATUS: ONLINE
> OPERATOR: Kayo "Kinho" Souza
> ROLE: Senior Software Engineer & Tech Lead | AI Engineer at Experity | TOPO co-founder
> LOCATION: Vitória, Brazil
> UPTIME: 8+ years in production, 4 with US clients
> OPEN TO: Remote full-time or contract roles
Senior Software Engineer, Tech Lead and AI Engineer, 8+ years in production, 4 with US clients. I build LLM agents that take real actions for users, and payment systems that never charge twice.
At Experity, which holds half of the US telemedicine market, I’m Tech Lead of the nearshore team on Care Agent, its LLM patient agent. I moved patient actions like booking out of the model into code, built session telemetry and an audit trail with a test-enforced PHI guard, put the agent runtimes under a 99.99% availability SLO and wrote 14 Architecture Decision Records, all under HIPAA.
Before that I led the 5-engineer Yooga payments team behind US$70M+ processed in 6M+ transactions, where idempotent flows and signed webhooks removed duplicate charges. At Nike I built the Asset Library behind 16M+ assets as sole engineer, and AutoCrop, a GenAI service that cut designers’ prep time 44%.
I co-founded TOPO Contábil (five-figure ARR in year one, zero spend on distribution) and founded Brasa Cargas, a freight marketplace with 700+ registered drivers. Top 0.01% Claude Code user globally, with multi-agent delivery and cross-model review gates in CI.
// EXPERITY · CARE AGENT
Held by Experity. I'm Tech Lead of the nearshore team on Care Agent
157 merged, in under 5 months
Architecture decision records I wrote
Agent runtimes, checked by a canary every 5 minutes
// TOPO CONTABIL
In year one, with zero spend on distribution
Tenant tables with RLS forced, enforced by a test
Claude-based assistant on a held-out eval split
Automated test files in the monorepo
// NIKE · MARKETING TECHNOLOGY
Behind the Asset Library I built as sole engineer
AutoCrop, a GenAI service: 6.4h to 3.6h
Automated, with correct typography
// YOOGA PAYMENTS
Payments platform I led
Idempotent flows, no duplicate charges
On a 7,000+ restaurant platform
Covering payment flows and webhooks
// TEGRUS · REURBR
The platform has since issued them in 14 municipalities
Down from 180 days on average
Design system for landing pages and multi-step forms
// QUINTOANDAR
Logistics and key-storage cost
CSAT, percentage points
Operational tasks automated
Adoption of new self-service flows
--- EXPERIENCE ---
Tech Lead of the nearshore engineering team on Care Agent, the LLM patient engagement and telehealth product of Experity, which holds half of the US telemedicine market. It serves US urgent care patients on AWS, under HIPAA. Booking runs in code instead of the LLM, and session telemetry keeps PHI out of every event.
Co-founded Topo with an accountant: a modular platform that runs the accounting operation of multi-company groups on top of their ERP. I built the product architecture, engineering and security.
1:1 technical mentor for Brazilian software engineers going after roles at international companies: mock technical interviews against the bar US companies hire at, and direction on what to study and how to grow into senior scope.
Owned the technical vision, architecture and delivery of payments at a restaurant operating system with 7,000+ restaurants, leading 5 engineers. Built SmartPOS for payment terminals, and the idempotent flows and signed webhooks that removed duplicate charges.
Built the core payment flows for merchant transactions, billing cycles and financial reconciliation, and helped move payments from a monolith to services.
Led front end for two Marketing Technology squads and owned their shared React/TypeScript app. Built the Asset Library as sole engineer and AutoCrop, a GenAI service that generates format-optimized crops.
Property visits, key management and move-in logistics at Brazil's largest proptech. Led the front-end migration to Next.js and built Java/Spring Boot services and GraphQL APIs on AWS.
Credit simulation engines and loan management systems for mortgage origination, integrated with financial APIs and credit bureaus. Full-stack on React/Next.js, Node.js and PostgreSQL.
Led the move from Laravel monoliths to React single-page apps and mentored the team in React. Built ReurBR, the land-regularization platform created with InspiraES and the Instituto Fucape, with a Vue 2 web app and an offline mobile app for field work. Built on my own a timesheet and task app for Ogilvy Brasil.
Delivered as sole engineer a municipal management platform under a six-figure contract, full-stack with PHP/Laravel, React and MySQL on AWS.
E-commerce catalog, cart, checkout and order management with PHP services on MySQL, integrated with third-party payment gateways.
Skills & Toolkit
- Top skills:TypeScript, Large Language Models (LLM), AI Agents, Technical Leadership, Java
- AI:Anthropic Claude, Claude Code, MCP, LLM agents, embeddings, generative AI
- Languages:TypeScript, JavaScript, Python, Java, Kotlin, Go, PHP
- Backend:Node.js, NestJS, Quarkus, Spring Boot, REST, GraphQL, Kafka, microservices
- Frontend:React, Next.js, React Native, Vue.js
- Data:PostgreSQL, MySQL, MongoDB, Redis
- Cloud:AWS (Bedrock AgentCore, Lambda, ECS, Step Functions, EventBridge, S3, RDS, DynamoDB, CloudWatch, X-Ray), Kubernetes, Docker, observability
- Domains:Payment systems, healthcare under HIPAA, SaaS, fintech, e-commerce
Education & Languages
- UniPDS // Postgraduate Specialization in Applied AI Engineering [2025 - 2026]
- Instituto Federal do Espírito Santo (Ifes) // Bachelor of Science, Computer Science [2013 - 2019]
- Portuguese: Native or bilingual
- English: Native or bilingual
- Spanish: Limited working proficiency
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I write about enterprise architecture, AI tooling, and production war stories. No fluff.
OPEN CHANNEL
Hiring for LLM agents or payments? Email me or message me on LinkedIn. Open to remote full-time or contract roles.
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