12TH EDITION
SOFTWARE DEVELOPER CONFERENCE

Main Conference
18 April, 2026
Elite World Grand Küçükyalı Hotel

MasterClass
17 April, 2026
Online

Past Events

2025 I 2024 I 2023 I 2022 I 2021

Java Day Istanbul is one of the most effective international community driven software conference of Türkiye supported by Istanbul Java User Group. The conference helps developers to learn the newest technologies about Java, Web, Mobile, Big DATA, Cloud, DevOps, Agile and Future. Java Day Istanbul also helps developers, tech companies, and startups to establish a good network among them.

12

25 550+

60+

EDITION

SPEAKERS

COMPANIES

ATTENDEES

SPEAKERS

Get ready to join us in Istanbul to network with peers, learn about the latest industry trends, make new connections, and more #JDI26

Akın Kaldıroğlu

@Backend Guru

MasterClass: Hexagonal I Clean I Onion Architecture

Dr. Naci Dai

@Eteration

Engineering Scalable AI with Java

Description: Python powers AI experiments—but production AI is a systems challenge. As agentic AI moves beyond notebooks into long-running, multi-agent platforms, the JVM re-emerges with strengths in concurrency, reliability, and safety. Discover why serious AI systems are increasingly built on the JVM.
Engineering AI at Scale: Why the Java Is the New Control Plane
Python might have won the battle, but Java will win the war for AI agents
For the past few years, the software industry has blurred two very different activities under the same label: training AI models and operating AI systems.
Because Python dominates the research and training phase, it has often been assumed incorrectly that it should also be the default choice for building production-grade, agentic AI platforms.
As organizations move from simple chatbots to stateful, long-running, multi-agent systems, a different set of engineering concerns begins to dominate: concurrency, orchestration, memory efficiency, type safety, observability, and supply-chain governance. These are not research problems they are systems problems.
We are at the beginning of the industrialization phase of AI, where experimental prototypes must be re-engineered into reliable platforms. In this phase, the JVM often overlooked in recent AI discussions re-emerges as a highly competitive runtime for agent orchestration and inference pipelines.
We will explore how recent and emerging JVM capabilities change the architectural landscape: how virtual threads dramatically simplify large-scale agent orchestration; how advances in JVM memory layout unlock efficient in-process vector workloads; and how type-safe agent frameworks such as LangChain4j help contain the failure modes of non-deterministic LLM outputs.
This is not an anti-Python talk. Python remains unmatched for experimentation and model development. Instead, this session focuses on what happens after the notebook when AI systems must run continuously, scale predictably, and fail safely.
Attendees will leave with a clearer mental model for choosing the right runtime for different phases of the AI lifecycle, and a practical understanding of why many production AI systems are increasingly being built on the JVM.

Ahmed Enis Erkaya

@TÜBİTAK BİLGEM YTE

Yapay Zekâ Ekseninde Kod Gözden Geçirme: İyi ve Kötü Pratikler

Description: Bir kod gözden geçirmenin 10 dakikasını AI ile 3 dakikaya indirmek mümkün. Peki kaliteyi kaybetmeden? Bu oturumda gerçek deneyimlerden dersler çıkarıyoruz.

AI destekli kod gözden geçirme, yazılım geliştirme süreçlerini yalnızca hızlandırmakla kalmayıp geliştiricilerin problem çözme yaklaşımını da yeniden şekillendiriyor. Bu oturumda, yapay zekânın güçlü ve zayıf yönleri ele alınırken, günlük iş akışına nasıl etkili şekilde entegre edilebileceğine dair pratik yöntemler paylaşılacak. “Hata bulan” bir araçtan öte, geliştiriciye yol gösteren bir asistanın nasıl değer kattığı gerçek örnekler üzerinden incelenecek. Ayrıca kod gözden geçirmede iyi ve kötü pratikler, açık kaynak ve ticari araçlardan örneklerle değerlendirilecek; yapay zekânın sınırları, yanıltıcı veya eksik önerilerle başa çıkma stratejileri tartışılacak. Katılımcılar, hem teknik içgörüler hem de doğrudan uygulanabilir araç ve yöntemlerle, AI destekli kod incelemeyi ekiplerinde etkin bir şekilde hayata geçirebilecekleri net kazanımlarla oturumdan ayrılacak.

Alper Hankendi

@ Hepsiburada

System Design Is Not Just Engineering: The Anatomy of Architectural Pitfalls

Description: System design isn’t just coding. it’s about decisions made under pressure and shifting goals. At Hepsiburada, where systems serve millions, we learned failures otfen stem from choices, not code. I’ll share real pitfalls and steps to build resilient, lasting systems. I'll explain PEDALS method.

Every big system begins with a simple request. At Hepsiburada, serving millions of users, we learned that the biggest failures didn’t come from bad code, but from architectural decisions made under pressure and shifting priorities. In this talk, I’ll share real pitfalls we faced, the epic failures that followed, and the lessons they left behind.I’ll also introduce the PEDALS framework as a practical way to approach decision-making in system design. Because in technical architecture there is never a single right answer only trade-offs, choices, and their consequences. This session ties those hard-learned stories to a framework you can apply to design systems that last.

Mihaela Gheorghe-Roman

@Systematic

Chaos meets code: Fractals as a playground for modern Java features

Description: Discover how modern Java relates to fractals and chaos theory! In this live-coded, interactive session, we’ll explore recursion, virtual threads, pattern matching & records to render fractals in real time - blending math, art, and code you can take home for your own projects.

Fractals are a unique blend of mathematics and visual art, and modern Java features provides powerful tools to explore them in new ways. In this talk, I’ll share how I’ve experimented with fractal generation using recent Java features - from virtual threads to enhanced pattern matching and records.

We’ll look at practical techniques for combining recursion with modern language and runtime capabilities to render fractals in real time, while reducing the traditional complexity of concurrency and boilerplate. You will leave with clear code examples and ideas you can adapt for visual, educational, or exploratory projects of your own.

Marco Belladelli

@IBM

Talk to Your Data: Hibernate-Powered Natural Language Data Access in Java

Description: Discover how Hibernate, the relational data library you know and love, meets the AI with the help of Quarkus world to make your database speak to you.

Explore how Hibernate ORM, Quarkus, and LangChain4j can join forces to enable natural language interactions with relational data in your Java application. Leveraging Hibernate’s deep understanding of your domain model and data access layer, new tools now bridge the gap between structured information and LLMs, allowing users and agents to query and explore data using plain language.

During this session we will demonstrate with a live demo of a Quarkus application how to interact in natural language with your existing Hibernate data model. In particular, we will show both how to manipulate data and how to use them to implement a simple but effective RAG pattern. This particular style of data interaction, including RAG, will have the advantage of leveraging Hibernate’s type-safe mappings, semantic-rich HQL, and fail-fast validation, making this data manipulation process more effective and less prone to hallucinations.

Finally, we will also showcase how to easily expose this tool as an MCP server through Quarkus, allowing it to be conveniently consumed in an agent to agent framework.

Serkan Çavuşoğlu

@MongoDB

From Full-Text to Vector Search: Modern Search Architectures for Java Applications

Description: Search is no longer just about matching keywords. Today’s users expect applications to understand what they mean, not just what they type. In this talk, we will journey from classic full-text search to semantic retrieval, vector embeddings, RAG, and agentic AI patterns that are reshaping modern software.

Using a Java application perspective, we will explore how to build smarter search experiences with MongoDB Atlas Search, combine lexical and semantic approaches, and design architectures that power AI-driven assistants and intelligent applications.

This session is for developers and architects who want to move beyond traditional search and understand how modern retrieval systems are built in practice.

Haoyi Li

Modernizing the Java Build Tool Experience

The Java language is known to be performant, easy to use, and with great IDE support, but Java build tools like Maven or Gradle don't always live up to that reputation.

This talk will explore why build tooling is fundamentally such a difficult domain to work in, but also how common concepts from object-oriented programming have the potential to greatly simplify the build tool experience.

We will end with a demonstration of an experimental new Java build tool "Mill" that makes use of these ideas, proving out the idea that Java build tooling has the potential to be much faster, safer, and easier than it is today.

Ram Lakshmanan

@yCrash

GC Tuning: A Masterpiece in Performance Engineering

Description: Garbage Collection Tuning is often overlooked in Enterprises. However, GC tuning dramatically reduces computing cost & drastically cuts down the response time. In this talk real case Studies from Fortune 100 companies will be shared.

In this session, you’ll gain firsthand insights into how industry leaders have approached Garbage Collection (GC) optimization to achieve significant performance improvements and save millions in infrastructure costs. We’ll analyze real GC logs, demonstrate essential tools, and reveal expert techniques used during these tuning efforts. Plus, you’ll walk away with 9 practical tips to optimize your application’s GC performance.

Merve Söylemez

@Oracle Türkiye

Java ile Bugünden Yarına: Kurumsal Öncelikler, Bulut ve Yapay Zeka

Description: Oracle Türkiye Genel Müdürü Merve Söylemez’in konuk olacağı fireside oturumumuzda, teknolojinin bugününü ve yarınını Java perspektifinden aşağıdaki konuları ele alıyoruz.

Java bugün hâlâ önemli mi?
Modern uygulamaların büyük bir kısmının temelinde yer alan Java, güçlü ekosistemi, güvenliği ve ölçeklenebilirliği ile önemini korumaya devam ediyor.

Kurumsal öncelikler: Java neden yarın da kritik olacak?
Dijital dönüşüm, sürdürülebilirlik ve operasyonel verimlilik odağında ilerleyen kurumlar için Java; güvenilir, esnek ve uzun vadeli bir yatırım olmaya devam ediyor.

Java yenilikleri: Nereye gidiyor?
Sürekli gelişen yapısı, performans iyileştirmeleri ve modern geliştirme pratiklerine uyumu ile Java, geleceğin ihtiyaçlarına hızla adapte oluyor.

Yapay zeka için Java
Makine öğrenmesi ve yapay zeka uygulamalarını destekleyen kütüphaneler ve entegrasyonlar sayesinde Java, bu alanda da güçlü bir oyuncu.

Buluta geçişi basitleştirmek
Java’nın platform bağımsızlığı ve bulut uyumlu mimarisi, kurumların buluta geçiş süreçlerini hızlandırırken maliyet ve operasyonel avantajlar sağlıyor.

Empowering Developers in the Age of AI

SCHEDULE

IMPRESSIONS

Senior Software Engineer
@Posten Bring AS

Altuğ B. Altıntaş

JUG Leader, Enterprise Architect @ING Bank

Akın Kaldıroğlu

Chief Learning Officer @BackendGuru

Nursel Cıbır

Business Agility Consultant
@Agile Kanban Istanbul

Jonathan Vila

Staff Developer Advocate
@Sonar

Venue

ABOUT THIS VENUE:

Elite World Grand İstanbul Küçükyalı in Maltepe, one of the best locations on Istanbul’s Asian side, you can soak in the perfect view of the sea and the Princes’ Islands!

FULL ADDRESS:

İnönü Caddesi No: 22 Küçükyalı

Maltepe - Istanbul / Turkey

Contact

12TH EDITION
SOFTWARE DEVELOPER CONFERENCE

Main Conference
18 April, 2026
Elite World Grand Küçükyalı Hotel

MasterClass
17 April, 2026
Online

Past Events

2025 I 2024 I 2023 I 2022 I 2021

12

25

550+