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Ninja report

Intel summary

Backend Software Engineer with 5+ years of experience developing critical, scalable systems operating in high-availability environments (~15 TPS and 40,000+ monthly transactions). Proficient in Node.js, TypeScript, Elixir, PostgreSQL, MongoDB, Redis, AWS, NATS.io, N8N, Python, AI/LLM (Claude, MCP servers) and event-driven architectures. Strong background in startup environments and lean teams, emphasising ownership, technical leadership and documentation (RFCs, ADRs).

Mission history

4 missions · 0 failed

Jan 2026 – Jul 2026

Senior Backend Software Engineer · Caveo · hybrid

FinAccount focused on the financial life of doctors.

  • Technically led the refactoring of a legacy system into a microservices architecture, optimizing the onboarding flow on the road to 20,000 users.
  • Designed and implemented an event-driven architecture (fan-out) with AWS SNS/SQS between a Next.js BFF and the backend.

Sep 2025 – Jan 2026

Backend Software Engineer (Mid-level III) · Caveo · hybrid

FinAccount focused on the financial life of doctors.

  • Built backend services with Node.js, TypeScript, Koa.js, and PostgreSQL (TypeORM) on AWS (SNS, SQS, Cognito, S3).
  • Led integrations with business-critical providers: KYC via QItech, and operational/sales automation via Pipefy and Pipedrive with N8N.

May 2023 – May 2025

Backend Software Engineer (Mid-level) · Nextcode · remote

AI-driven digital onboarding, identity verification (KYC) and anti-fraud.

  • Architected an onboarding system with facial biometrics, OCR, taxpayer ID validation, and proof of life, processing 40,000+ monthly transactions (~15 TPS).
  • Integrated Serpro and Receita Federal APIs, raising approval rates and cutting fraud; built a biometric risk-scoring system that reduced chargebacks.
  • Developed and maintained APIs with Node.js, TypeScript, Elixir, PostgreSQL, MongoDB, Redis, AWS and NATS.io.
  • Designed asynchronous processing flows and data pipelines (ETL/ELT) with N8N and queues, saving 80 hours a month at 100% SLA compliance.
  • Built a WhatsApp notification service on NATS.io; shipped a Flutter app for private events with KYC.
  • Mentored interns, introduced an RFC process, and created CI/CD pipelines that cut deploys from 5 minutes to 1.
  • Introduced an RFC process for technical decisions, building a culture of documentation and alignment.

Aug 2021 – May 2023

Backend Software Engineer (Junior) · Nextcode · remote

AI-driven digital onboarding, identity verification (KYC) and anti-fraud.

  • Built RESTful APIs with Node.js/Fastify, TypeScript, and MongoDB.
  • Documented company APIs and evolved legacy solutions with clean code practices and automated tests.
  • Documented the company APIs.

Jutsu registry

backend
Node.jsTypeScriptJavaScriptElixirPython (familiar)SQLRESTGit
databases
PostgreSQLMongoDBRedisMySQL
messaging
AWS SNSAWS SQSNATS.iowebhooks
infra
AWSDockerKubernetes (familiar)GitHub ActionsPortainerCI/CDN8N
concepts
distributed systemsmicroservicesevent-driven architecturedata pipelinesasynchronous processing
practice
technical RFCsADRsdocumentationmentoring

Academy record

B.Sc. Information Systems 2018–2021

Universidade Anhembi Morumbi, São Paulo

Languages

portuguese
native
english
advanced

Reachable at simao.msjr@gmail.com, GitHub and LinkedIn.