Senior / Principal Java Engineer — Distributed Systems & Real-Time Platforms

I design and build high-throughput, fault-tolerant backend systems with 19+ years of experience. Most of my career has been spent on high-volume transactional and real-time event-driven platforms — real-time data feeds, high-concurrency transaction engines, settlement & reconciliation pipelines, and nationwide distributed device-fleet management.

Architecture: Microservices · Clean Architecture · Hexagonal Architecture · Event-Driven · Domain-Driven Design

core-banking — a core banking domain model in Java / Spring, built to explore Domain-Driven Design tactical patterns (entities, value objects, aggregates, repositories) on a realistic banking domain. Work in progress, public from day one.

Deep-dives on DDD, the banking domain, and Java/Spring — read them on my site:

• Domain-Driven Design — Level 1 (series)
  • Part 1 — Entity & Value Object
  • Part 2 — Aggregate & Aggregate Root
  • Part 3 — Repository, Domain & Application Service
• Account vs. Ledger — Foundations of Core Banking

→ gungorakbiyik.github.io · also on Medium @gungor.akbiyik

• 🏢 19+ years building distributed, real-time Java systems
• ⚡ Domain experience in high-throughput transactional platforms — real-time feeds, settlement & reconciliation, fault tolerance under load
• 👥 Led backend teams of up to 8 engineers
• 📍 Istanbul, Turkey — open to Remote / Hybrid / On-site
• 📚 Currently learning: Python & AI Agents