GeeCON Conference Courses

Faster Java Builds with the Mill Build Tool

Discover how Mill build tool delivers 4-10x faster Java builds than Maven with automatic caching, parallelism, and easy extensibility for large projects.

• YouTube
• 52 minutes
• Self-Paced
• Free Video

Stream Gatherers - Let's Get to Know Each Other Better!

Explore Stream Gatherers in JDK 24, Java's biggest Stream API revolution since JDK 8. Solve business problems using built-in gatherers and create custom ones for flexible data processing.

• YouTube
• 51 minutes
• Self-Paced
• Free Video

Avoid Common LLM Pitfalls

Discover techniques to overcome LLM hallucinations, outdated info, and cost issues through grounding, RAG, function calling, and security testing for real-world applications.

• YouTube
• 54 minutes
• Self-Paced
• Free Video

From Days to Hours - How EventStorming Transformed Our Domain Modeling Process

Discover how EventStorming revolutionizes domain modeling, transforming complex project understanding from days to hours and bridging the gap between developers and domain experts.

• YouTube
• 50 minutes
• Self-Paced
• Free Video

The Emperor Has No Docs - From Neglecting Documentation to Making It Essential in Software Delivery

Discover why software documentation is crucial for teams, exploring practical tips to integrate docs into your delivery cycle and counter common excuses for avoiding documentation.

• YouTube
• 53 minutes
• Self-Paced
• Free Video

Die Hard - Defeating a Java Compiler Bug IS an Xmas Story

Discover how Gradle and Oracle engineers collaborated to hunt down a critical JDK compiler bug affecting reproducibility, featuring detective work and teamwork in this engaging tale.

• YouTube
• 32 minutes
• Self-Paced
• Free Video

How to Build Distributed Concurrency Primitives

Explore building distributed versions of Java concurrency primitives like locks and atomics for microservices, covering additional guarantees needed and Raft protocol implementation.

• YouTube
• 48 minutes
• Self-Paced
• Free Video

Freelancing - The Good, the Bad and the Ugly

Explore the realities of freelance software engineering, from startup challenges to business success factors, with practical insights from an experienced consultant's journey.

• YouTube
• 51 minutes
• Self-Paced
• Free Video

Embracing Microservices - Learning from Implementation Failures and Successes

Discover common microservices implementation pitfalls and learn from real-world successes and failures to avoid team composition, deployment, and security policy mistakes.

• YouTube
• 57 minutes
• Self-Paced
• Free Video

Stream Gatherers - The Biggest Change to Java Streams Since 10 Years

Discover Java 22's Stream Gatherers, the most significant enhancement to Streams in a decade, and learn to create custom intermediate operations with unlimited possibilities.

• YouTube
• 40 minutes
• Self-Paced
• Free Video

Superhuman - How to Be a Manager and Not Lose Your Mind

Master engineering management challenges from AI adoption to multi-generational teams while maintaining personal resilience and avoiding burnout in modern tech leadership.

• YouTube
• 48 minutes
• Self-Paced
• Free Video

All the Things That I F**ed Up and What I Learned from Them

Discover 12 professional missteps from a solutions architect and learn how failures in legacy systems, cloud migrations, and stakeholder alignment become stepping stones to success.

• YouTube
• 1 hour 2 minutes
• Self-Paced
• Free Video

Architecture Uncomplicated - Tools for Simplified Large Scale Systems

Discover practical strategies for managing large-scale systems without complexity, covering scalability patterns, time modeling, and real-world solutions for evolving architectures.

• YouTube
• 1 hour 2 minutes
• Self-Paced
• Free Video

Magic of Automation and Everyday Chores

Discover how AI tools like ChatGPT can automate repetitive developer tasks, from code generation to security checks, making your applications more secure and maintainable.

• YouTube
• 46 minutes
• Self-Paced
• Free Video

From Words to Wisdom - How LLMs and Vector Databases Revolutionize Data

Explore how LLMs and vector databases work together through vectorization, semantic search, and real-time retrieval using Kotlin and LangChain4j in practical demonstrations.

• YouTube
• 48 minutes
• Self-Paced
• Free Video