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hinokamikagura/README.md

Hi, I'm Kairos Stroud 👋

Senior Java Backend Developer

7+ years architecting high-scale, low-latency backend systems | Production-grade microservices & event-driven architecture | Fintech • Crypto • Web3 • Social platforms

🚀 About Me

I'm a Senior Java Backend Developer with 7+ years of hands-on experience designing and shipping scalable, reliable backend systems for high-traffic platforms (50k+ DAU peaks, millions of daily interactions).

Specialized in Java 21, Spring Boot 3.x, Kafka event-driven architecture, WebSocket real-time communication, microservices, AWS, and Web3 integrations (wallet auth, token-gated features, blockchain providers).

Proven track record: 65% feed latency reduction, 99.96% uptime under heavy load, 60% fewer production incidents through observability & resilience engineering. Mentor, on-call leader, and full-stack contributor (React/Angular frontend integration).

Open to remote senior backend / full-stack roles — US/EU time zones.

💻 Tech Stack

Core Languages

Java Kotlin TypeScript

Backend & Frameworks

Spring Boot Spring Cloud Kafka WebSocket

Cloud & DevOps

AWS Docker GitHub Actions Kubernetes

Databases & Messaging

PostgreSQL Redis MongoDB

Web3 & Blockchain

Ethereum Solana Web3

Frontend (Full-Stack Touch)

React Angular

📈 Expertise Areas

  • 🔐 Secure Backend Systems — Wallet authentication, token-gated content, blockchain transaction validation
  • ⚡ High-Performance & Low-Latency — Sub-100ms real-time feeds/notifications, 20k+ TPS simulations
  • 🔗 Event-Driven Microservices — Kafka Streams, Saga pattern, CQRS-like flows
  • 🛡️ Reliability & Observability — Circuit breakers, retries, Prometheus/Grafana, 99.96% uptime
  • 🤝 Full-Stack Ownership — End-to-end features (Spring Boot APIs + React/Angular frontends)
  • 🧑‍🏫 Mentoring & Leadership — Code reviews, architecture decisions, mentoring 5+ engineers

🔥 Featured Projects

Cryptocurrency Wallet & Trading Engine Simulator
Full backend simulation of wallet, order book, matching engine (Java 21 + Spring Boot 3 + Kafka real-time events + atomic balance updates + risk engine). Dockerized & Gatling load-tested (20k+ TPS).
→ github.com/hinokamikagura/crypto-wallet-engine

Event-Driven E-commerce Marketplace
Microservices (Order, Inventory, Payment) using Saga pattern over Kafka for distributed transactions. React frontend, Swagger docs, Testcontainers, resilience patterns (Resilience4j), deployed to AWS free tier.
→ github.com/hinokamikagura/event-driven-ecommerce-marketplace-simulator

📫 Let's Connect

Feel free to reach out if you're building high-scale real-time systems, Web3 platforms, or event-driven backends — happy to chat! 🚀

Pinned Loading

  1. crypto-wallet-engine crypto-wallet-engine Public

    Production-grade cryptocurrency trading engine simulator with event-driven architecture, atomic balance updates, and thread-safe order matching. Built with Spring Boot 3.3+, Kafka, PostgreSQL, and …

    Java 10 4

  2. event-driven-ecommerce-marketplace-simulator event-driven-ecommerce-marketplace-simulator Public

    Event-driven microservices marketplace demonstrating distributed transactions via Saga pattern over Kafka. Built with Spring Boot 3.3, Java 21, React 18, PostgreSQL, Docker. Features choreography-b…

    Java 7 3

  3. eth-tracker eth-tracker Public

    High-performance EVM blockchain event tracker. Monitors transactions & events, filters by address, publishes to NATS JetStream. Supports distributed deployment.

    Go 9 2

  4. go-job-opportunities-api go-job-opportunities-api Public

    A scalable Job Opportunities API implemented in Go, featuring Gin as the HTTP router, GORM for ORM-based database management, and SQLite as the storage layer. Includes Swagger for automatic API doc…

    Go 12 2

  5. Ether-Vault Ether-Vault Public

    A decentralized finance (DeFi) staking platform built with React and Solidity, allowing users to stake Ethereum and earn VGB token rewards at 10% APR on Sepolia testnet.

    Solidity 3 1

  6. transaction-monitor-microservice transaction-monitor-microservice Public

    A scalable Go-based microservice for real-time monitoring of Bitcoin, Ethereum, and Solana addresses. Integrates with blockchain RPC endpoints and streams validated transaction events to Kafka for …

    Go 3 1