Martin Ladecký
tech lead in Commerzbank, exCTO Loono, Czech JUG organiser
Prague, Czechia
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A technical leader with over 15 years of experience in high-stakes banking and non-profit digital transformation. Currently, he is architecting the "Exit Strategy" for some of the largest data volumes in European banking, moving billions of records to the cloud. When he isn't re-architecting legacy systems, he organizes the Czech Java User Group and contributes to Česko.Digital to help NPOs change lives through technology.
Area of Expertise
Topics
The Bank Crash Chronicles: Why Our 11TB Oracle Exadata Architecture Failed
When dealing with 11TB of data and 10 billion records, the "standard" ways of ensuring data integrity begin to fail. Conventional read-side duplicate checks can become a bottleneck that can paralyse a system, especially under the scrutiny of financial regulators such as BaFin.
This session moves beyond the theory of database constraints and provides a battle-tested blueprint for managing massive data volumes in highly compliant environments. We will explore the architectural shift from read-side validation to a Write-Side Integrity Strategy, detailing the logic, the specific Spring-based implementation, and the performance gains realised.
Furthermore, we will break down the ongoing "Exit Strategy" from legacy Oracle Exadata to Cloud PostgreSQL. We will share best practices for a Zero-Loss Migration, ensuring 100% data integrity is maintained as we move billions of records under extreme time and regulatory pressure.
Beyond the Prompt: Hiring Senior Engineers in the 2026 AI Surge
By 2026, the "Take-Home Assignment" has reached a breaking point. With multi-modal LLMs solving standard Spring Boot challenges in seconds, technical screenings now often measure prompt fluency rather than engineering excellence. When every candidate produces "perfect" code, how do you distinguish the true architects from the sophisticated synthesisers?
This session introduces a "back-to-basics" hiring framework that bypasses high-level syntax to test first-principles logic. We explore a shift from API design tasks toward hardware-inspired visual programming challenges, focusing on transistors, logic gates, and bitwise operations. By stripping away the abstractions AI has mastered, we create a "logical stress test" that exposes a candidate’s fundamental reasoning, spatial awareness, and depth of problem-solving.
In this session, we will cover:
The Evolution of the "Cheat": A 2026 update on how candidates use agentic AI to bypass traditional hurdles.
Designing for Reasoning: How to build "niche" logical frameworks and visual constraints that force first-principles thinking over pattern-matching.
The Judgment-First Framework: Shifting evaluation from "Does it work?" to "How do they verify?"—testing the ability to audit AI and catch architectural hallucinations.
Defining the 2026 Senior: Why seniority is shifting from Implementation Velocity to Architectural Integrity.
The Complete Guide to Secret Hygiene for Java and Cloud-Native Engineers
"It’s just a local config." "I’ll delete the history later." In the fast-paced world of Cloud-Native Java, these common phrases are the precursors to security disasters.
As developers, our tools are designed for convenience, but that convenience often creates "secret leaks" across the entire supply chain. This session is a forensic deep dive into how credentials escape into the wild. We will perform live autopsies on common security blunders, tracing secrets through:
• The Developer Desk: Plain-text risks in Maven settings.xml.
• The Source: Why git rm fails to protect your history.
• The Image: Using dive to uncover passwords in "deleted" Docker layers.
• The Pipeline: How CI/CD logs in Jenkins or TeamCity can betray you.
• The Runtime: Moving from hardcoded Tomcat server.xml to modern Vault injection.
This isn't just a talk about what's broken; it's a guide on how to fix it. You will leave with a practical toolkit of pre-commit hooks, Maven encryption techniques, and secret injection strategies to ensure your credentials stay exactly what they were meant to be: secret.
Building Loono: A Deep Dive into the Tech Stack and Design Choices of a Mobile Health App
Get a behind-the-scenes look at the development of the Loono mobile app, a platform dedicated to preventative healthcare with a strong focus on self-examination. Martin will guide you through the key architectural decisions, technology choices (Flutter, AWS, GitHub Actions), and their rationale. Learn how Loono leverages cloud tools to manage fast and scalable development, costs, and reliability for more than 50 thousand users.
MakeIT 2026 / JCON OpenBlend Slovenia 2026 Sessionize Event Upcoming
KCD Czech & Slovak 2026 Sessionize Event Upcoming
Spring I/O 2026 Sessionize Event
KCD Czech & Slovak 2025 Sessionize Event
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