01
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Notion Compass
Browser extension to find and open any Notion page from any workspace, right from your browser. Consolidates multiple Notion workspaces into a single interface, with authentication via Notion's official OAuth API.
BACKEND ENGINEER / SÃO PAULO
Guilherme
Leite/Backend Software Engineer
Designing APIs and microservices built to scale and last.
Backend engineer with 3+ years designing and maintaining REST APIs and microservices in production with Java and Spring Boot. I work across distributed systems and mobile, applying Clean Code and SOLID where the impact is measurable. Currently pursuing a postgraduate degree in Java Engineering at FIAP.
03 / STACK
Stack
Tools I work with regularly and confidently in production.
- Languages
- Java·TypeScript·PHP·SQL
- Frameworks
- Spring Boot·NestJS·Laravel·React Native·ReactJS
- Tools
- Docker·AWS·Maven·Swagger / OpenAPI·Git
- Databases
- PostgreSQL·MySQL·Cassandra·JPA / Hibernate
04 / SELECTED
Selected work
Three recent projects. The full list is just below.
02
FRAME 01 / 01
URL Shortener
Production-grade URL shortener built for extreme traffic. Generates 4-character Base62 shortcodes via sub-millisecond Redis INCR, decouples click logging through RabbitMQ for instant 302 redirects, keeps hot URLs cached in Redis, and uses Cassandra for horizontal scalability to millions of requests per second. Load-tested with k6: p99 under 100ms at zero error rate with 200 users/second.
03
FRAME 01 / 01
Distributed Payment Gateway
Simulated payment gateway built with an event-driven, containerized microservices architecture. Features Nginx least-connection loadbalancing across two instances per service, RabbitMQ async decoupling with dead-letter queues, per-service PostgreSQL isolation, idempotency via requestId, and a full observability stack with Prometheus, Loki, and Grafana.
05 / CONTACT
Contact
Email is fastest. I usually reply the same day.