Talk
Rethinking Legacy Modernization: AI-Augmented Engineering in a Real E-commerce Transformation
Quickie (INTERMEDIATE level)
MC 3
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Modernizing large-scale legacy systems is one of the hardest challenges in enterprise engineering especially when dealing with highly dynamic systems where capabilities and complexity have evolved organically over time. In this talk, we present a radically different approach: treating legacy code not as technical debt, but as the source of truth and executable specification.

We walk through how we transformed a complex enterprise e-commerce platform, serving hundreds of millions of visitors per year, into a modern architecture using an AI-augmented, agent-driven methodology. At the core of this approach is a multi-stage pipeline powered by AI agents and human expertise.

This session demonstrates how combining agentic AI, structured human oversight and utilizing legacy code as a source of truth can reduce timelines by multiples while increasing confidence and quality.
Michail Kollias
Cosmote Telekom
Michail Kollias is a Chapter Leader for Digital Commerce Applications at COSMOTE Telekom, where he leads the design and delivery of large-scale digital platforms serving millions of customers. With over 15 years of experience in software engineering and IT leadership, Michail specializes in building high-performing teams and driving complex transformation initiatives across enterprise environments.
With a strong background in architecture and product delivery, Michail has led the adoption of modern technologies including microservices and cloud-native platforms. He is passionate about aligning technology strategy with business goals, ensuring scalable, resilient, and customer-centric solutions.
Michail is a strong advocate of team collaboration, transparency, and continuous improvement. He enjoys mentoring engineers and leaders alike, fostering a culture of excellence & innovation and is dedicated to delivering technology solutions that create measurable business value.
Zisis Michalaris
Cosmote Telekom
Zisis Michalaris is a Senior Software Engineer at COSMOTE Telekom, working on large-scale digital platforms and distributed systems. His work focuses on backend development, architecture and building resilient services using cloud-native technologies.

He has strong expertise in the payments domain and digital channels, along with experience in developing enterprise-grade solutions. His technical background includes microservices, event-driven systems and modern platforms powered by CI/CD practices. He is actively building applications that leverage AI to enhance system capabilities and user experience, while also leading projects from design to delivery.

Zisis is passionate about system design, automation and continuous improvement. He enjoys tackling complex problems and turning them into scalable & maintainable solutions, always aiming to bridge the gap between technology and real-world impact.