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Leonidas Kanellopoulos

Flutter Ninja @ SimpleApps
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Speaker's Bio

Leonidas Kanellopoulos is a senior Flutter developer, digital product builder, and co-founder of SimpleApps, an award-winning mobile app agency based in Greece. With over 10 years in mobile app development—and 5+ years specializing in Flutter—he’s helped bring more than 35 digital products to life, working with clients like Deutsche Telekom and Four Points by Sheraton. Through his work at SimpleApps, Leonidas has helped build apps that have reached over 3 million users around the world.

At SimpleApps, Leonidas leads the creation of mobile and web applications from scratch, focusing on user-centric design and scalable architecture. The team’s work has earned over 13 awards for innovation, recognizing their impact across industries.

He’s also a Google Developer Group Organizer with a focus on Flutter and Firebase, and a Women Techmakers Ambassador, advocating for diversity and inclusion in tech.

Whether he’s leading workshops, writing developer-friendly articles, or mentoring aspiring devs, Leonidas brings clarity, enthusiasm, and real-world experience to the table.

Leonidas Kanellopoulos is a senior Flutter developer, digital product builder, and co-founder of SimpleApps, an award-winning mobile app agency based in Greece. With over 10 years in mobile app development—and 5+ years specializing in Flutter—he’s helped bring more than 35 digital products to life, working with clients like Deutsche Telekom and Four Points by Sheraton. Through his work at SimpleApps, Leonidas has helped build apps that have reached over 3 million users around the world.

At SimpleApps, Leonidas leads the creation of mobile and web applications from scratch, focusing on user-centric design and scalable architecture. The team’s work has earned over 13 awards for innovation, recognizing their impact across industries.

He’s also a Google Developer Group Organizer with a focus on Flutter and Firebase, and a Women Techmakers Ambassador, advocating for diversity and inclusion in tech.

Whether he’s leading workshops, writing developer-friendly articles, or mentoring aspiring devs, Leonidas brings clarity, enthusiasm, and real-world experience to the table.

2025 Flutter Project Organizing

Workshop: Organize Your Flutter Code Like a Pro – From Zero to Hero

Sat 22 Nov 2025 • 14:50 (CET) • Basic

Tired of messy Flutter projects and spaghetti code? In this fun and practical workshop, you’ll learn how to structure your code and style your apps like a seasoned dev. We’ll cover simple, scalable patterns that take you from zero to hero—no experience in “architecture” needed! Whether you’re just starting out or looking to clean up your current project, you’ll walk away with battle-tested strategies to build apps that are clean, maintainable, and ready to grow.

Leonidas Kanellopoulos
  • 10:20 - 10:40
  • Auditorium
  • Theme: Tech with Impact

Day oppening: Impossible is Nothing

  • A discussion of building global success and how artificial intelligence is transforming the world.

A discussion of building global success and how artificial intelligence is transforming the world.

  • 16:15 - 16:25
  • Auditorium
  • Theme: Other

Closing

  • 16:00 - 16:15
  • Auditorium
  • Theme: Other

Hackathon Final Pitching

  • 15:40 - 16:00
  • Auditorium
  • Theme: Other

Open Award

  • 14:55 - 15:40
  • Auditorium
  • Theme: Panel

Panel / Debate discussion

  • 14:45 - 14:55
  • Auditorium
  • Theme: Sponsor

Gold Sponsor Speech

See the Full Agenda
  • 14:30 - 15:30
  • Tags: #SW

Embracing Chaos: Harnessing the Power of Chaos Testing for Resilient Systems

  • Testing is essential to ensure that your software application performs as expected. No doubt about it. But even if your application runs smoothly in a testing environment, unexpected incidents can occur in production, such as a crashed database or a lost connection to a third-party service. To ensure your application can handle such incidents and minimize their impact, you need to incorporate chaos testing into your delivery process. In this workshop, we will start with a brief introduction to k6 for backend performance testing and we’ll explore how to implement chaos testing using k6 for two backend services, to help you ensure the resilience of your application.
  • 12:05 - 13:30
  • Tags: #SW

Liberate your data using Redis Stream and Go

  • Redis is an in-memory database popular for many use cases, such as content caching, session stores, real-time analytics, message broker and data stream needs. Since version 5.0 of Redis a new data structure, Redis Streams, dedicated to managing streams has been introduced. Using Redis Streams, anyone can do a lot more than what was possible with Pub/Sub, Lists or Sorted Sets in the data stream domain. In this all-hands session, we’ll walk you through the basics of how to use Redis Streams, how consumer groups work, and finally show a working application using Go that uses Redis Streams.
  • 11:15 - 11:55

From Spark to Launch: The Thrilling Ride of Building Great Products

  • Join us for an exciting firechat with experts from product management, test engineering, DevOps, and software development. We’ll take you through the journey of turning an idea into a fully finished product ready for the market. Hear firsthand from our panelists about the teamwork needed to create innovative products. They’ll share insights about the ups and downs, breakthroughs, and challenges they’ve faced. Learn the secrets of successful product launches, including careful planning, prioritizing tasks, and effective teamwork. Find out how testing and quality checks ensure product excellence, and see how continuous integration and DevOps practices make the process smoother. Understand why user feedback is important for improving products, and get tips on the latest tools and methods that boost efficiency and innovation. Whether you’re experienced or just starting out, you’ll gain valuable insights into every step of bringing a product to life, from the first idea to the final launch.
  • 15:35 - 16:30

Transitioning a Content Streaming Platform from Monolithic to Microservices

  • 14:30 - 15:25
  • Tags: #AI

AI & Data Science: Insider Insights from Tech Leaders

  • Join us for an interactive workshop where Matina & Lilian having worked as Tech / AI Leaders at Meta, IBM, Vodafone, Startups share valuable insights into the opportunities available in AI and data science. Gain practical knowledge and industry perspectives to guide your career journey in this rapidly evolving field
  • 12:25 - 13:20

LLM vs RAG – the challenges and opportunities in real life use cases on real life problem

  • In this 50-minute workshop participants will delve into the intricacies of Large Language Models (LLMs) and Retrieval-Augmented Generation (RAG). The session will explore how these advanced AI technologies are transforming various industries by enhancing natural language understanding and generation. Attendees will gain insights into the fundamental differences between LLMs and RAG, their respective strengths, and the unique challenges they present when applied to real-world scenarios. The workshop will also highlight practical applications and case studies, showcasing how businesses and researchers are leveraging LLMs and RAG to solve complex problems. Participants will have the opportunity to engage in interactive discussions, addressing common obstacles such as data privacy, model interpretability, and scalability. By the end of the session, attendees will be equipped with a deeper understanding of how to harness the potential of these cutting-edge technologies to drive innovation and efficiency in their own projects.
See the Full Workshops Agenda