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6 followers · 4 following

Achievements

Achievement: Pair ExtraordinaireAchievement: QuickdrawAchievement: Pull Sharkx2

Achievements

Achievement: Pair ExtraordinaireAchievement: QuickdrawAchievement: Pull Sharkx2

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BatuhanBaysal/README.md

👋 Hi, I'm Batuhan Baysal

Software Engineer | Backend & Full-Stack

I am a Software Engineer focused on designing resilient, scalable, and observable enterprise-grade systems. My core expertise lies in the Java/Spring Boot ecosystem, with a deep passion for building high-performance architectures, implementing robust security protocols, and achieving full-stack observability.

🎯 Objective & Vision

Since my internship at Chippin (Koç Holding) in the summer of 2024, I have been committed to mastering enterprise-level development. My approach goes beyond simple coding; I prioritize system architecture, proactive observability (LGTM stack), and automated testing pipelines. My goal is to build scalable distributed systems, tackle complex architectural challenges (like concurrency and ACID compliance), and contribute to innovative engineering teams that demand high-availability and reliability.

🛠️ Engineering Competency Set

  • Core Development: Java 17, Spring Boot 3, Spring Cloud, Maven, Clean Architecture, DDD.
  • Full-Stack Development: React 19, TypeScript, Vite, Tailwind CSS, WebSocket (STOMP).
  • Quality & DevOps: JUnit 5, Mockito, SonarQube (Static Analysis), CI/CD (GitHub Actions), Docker, K8s.
  • Data & Persistence: PostgreSQL 15, Redis, Liquibase (Versioning), Pessimistic/Optimistic Locking.
  • Observability (LGTM Stack): Loki, Grafana, Jaeger, Prometheus, OpenTelemetry, Micrometer.
  • Security & Messaging: Keycloak (IAM), OAuth2/OIDC, JWT, RabbitMQ (Event-Driven), Resilience4j.

💼 Engineering Portfolio

Project Core Stack Engineering Challenge & Solution Impact
Chess Platform Java, React, WebSocket, Redis Challenge: Real-time latency. Solution: STOMP handlers & FIDE rule engine. Sub-100ms sync.
Secure Banking Core Java, Spring Boot, Keycloak Challenge: Deadlocks & ACID compliance. Solution: Pessimistic Locking & Liquibase. Eliminated deadlocks.
Cloud Observability Java, Spring Cloud, LGTM Challenge: System visibility. Solution: OpenTelemetry distributed tracing. Reduced MTTR.

Beyond these, I developed the Auth & Notification Stack for event-driven reliability (RabbitMQ), Fullstack Secure NoteApp for stateless auth, and Bookverse REST API for robust, test-driven RESTful design.

📐 Architectural Focus & Principles

  • Architecture Style: Clean Architecture, Domain-Driven Design (DDD), Modular Monolith & Microservices.
  • Resiliency & Scaling: Event-Driven Systems (RabbitMQ), Distributed Caching (Redis), Concurrency Control.
  • Observability & Ops: End-to-End Tracing (LGTM), Containerization (Docker/K8s), Automated Testing.

📫 Let's Connect

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  1. chess-platform chess-platform Public

    An enterprise-grade, full-stack real-time chess ecosystem powered by Java, Spring Boot, React 19, custom FIDE rule engine, Stockfish AI, and the LGTM stack.

    Java 1

  2. secure-banking-core secure-banking-core Public

    Enterprise Banking Core: Java 17 & Spring Boot 3.4 Modular Monolith. Robust security with Keycloak (OIDC/RBAC). Resilience4j (Circuit Breaker, Rate Limiter, Bulkhead). Async messaging via RabbitMQ.…

    Java 5

  3. spring-cloud-observable-microservices spring-cloud-observable-microservices Public

    A robust, full-stack microservice architecture template built with Spring Cloud, featuring Eureka, API Gateway, PostgreSQL, and comprehensive observability via Zipkin, Prometheus, and Grafana.

    Java

  4. fullstack-secure-noteapp-spring-react fullstack-secure-noteapp-spring-react Public

    A secure Full Stack note application built with Spring Boot 3 (Java 17) REST API and React.js. Features JWT Auth, RBAC (Admin Panel), and PostgreSQL database persistence.

    JavaScript

  5. auth-notification-microservice-stack auth-notification-microservice-stack Public

    A dedicated microservice stack (Auth & Notification) built with Spring Boot 3. Features decoupled email verification, Redis, and PostgreSQL persistence.

    Java 1

  6. bookverse-rest-api bookverse-rest-api Public

    High-performance RESTful API for a book-centric social platform. Built with Spring Boot, PostgreSQL, and secured with JWT.

    Java