Pantazis Deligiannis

Principal Software Engineer, Microsoft CoreAI

At Microsoft CoreAI, I lead the design and development of agentic AI systems for large-scale code intelligence and automated code migrations across entire organizations.

Across nearly a decade at Microsoft, spanning CoreAI and Microsoft Research, I’ve turned research into production systems used across Azure, Microsoft 365, and Windows. Before Microsoft, I earned a PhD in Computing from Imperial College London.

I’m also the founder of Coffee Makes Games, a solo indie studio where I use AI-native engineering to create iOS games such as Dungeon Story.

2025 - Present

Microsoft CoreAI

Architected and delivered a large-scale AI-powered code understanding system now used in a Microsoft-scale product experience. Led the architecture and implementation of a Copilot-native platform for agentic code migrations, designed to scale across thousands of repositories or large monorepos. Drove development of agentic review tooling to help developers assess representative examples of repetitive changes, focus on changes requiring closer inspection, and manage bulk approvals and feedback at scale. Established replayable evaluations for targeted experimentation and failure analysis without rerunning entire migrations.

2016 - 2025

Microsoft Research

Led the design and implementation of Coyote, an award-winning open-source tool for systematically finding and reproducing hard concurrency bugs in C# services, used across Azure and other Microsoft engineering groups to improve reliability before production. My work there also spanned the calculation engine behind Excel on the web, programming languages and runtimes, and later led work on an LLM-powered code transformation platform used across Azure, Microsoft 365, and Windows.

2025 - Present

Coffee Makes Games

Founded a solo indie studio building iOS games such as Dungeon Story, using AI-native engineering to take projects from concept to release. Dungeon Story is available worldwide on the App Store.

coffeemakesgames.com Watch gameplay trailer App Store