GraphQL Days @ FOST Paris — Dec 1-3

About

GraphQL Days is a three-day community track hosted at FOST (Future of Software Technologies, think federation of conferences!), shared with AsyncAPI, OpenAPI and JSON Schema.

It is an opportunity to connect with other API ecosystems, meet new and seasoned GraphQL users, educate about GraphQL, share best practices, and have fun!

The event is open to everyone — whether you run GraphQL in production or are evaluating it for your next project.

Schedule

All times in Paris Time (CET, UTC+1)

Beyond the Query: GraphQL Features That Make Frontends Simpler

December 1, 11:30 – 11:55

GraphQL

Fetching data is only the beginning. Some of GraphQL’s most useful features help with what comes next: organizing components, loading another page, keeping the UI in sync after a mutation, and catching mistakes before they reach production.

Aurelien David

Pennylane, Engineering Manager

Aurelien David

Pennylane, Engineering Manager

One to many without breaking anyone: evolving a GraphQL schema with many consumers

December 1, 14:30 – 14:55

GraphQLSchema Evolution

Changing a field from "one" to "many" sounds trivial until three different consumers depend on it: an admin studio, a GraphQL API used by web and mobile apps, and a public API used by customers' own integrations. This talk walks through a real migration on an event technology platform, where a single-value relationship became a multi-value, ordered one. We will cover how we designed the new schema alongside the old one, how we kept existing queries working, how we backfilled data safely, and how we decided when a deprecated field could finally go.

Gabriela Colombo

Swapcard, Software Engineer II

Gabriela Colombo

Swapcard, Software Engineer II

Explaining GraphQL Federation to my non-technical wife

December 2, 11:20 – 11:45

GraphQLFederation

In this talk, I will explain the core concepts of GraphQL Federation as accessibly as possible. The goal is that you could show this talk to anyone non-technical (such as my wife!) and they'd be able to understand and follow along. Some example topics include what subgraphs and supergraphs are, what entities are, what composition directive are, etc. It will be a fun, interactive (with audience participation!) experience.

David Stutt

WunderGraph, Senior Founding Engineer

David Stutt

WunderGraph, Senior Founding Engineer

GraphQL Variables Meet JSON Schema: The New Pitfall When AI Agents Call Your API

December 2, 14:00 – 14:25

GraphQLAI Agents

When an MCP server exposes a GraphQL operation as a tool for AI agents, the operation's variables get turned into a JSON Schema, and that schema is what the agent sees. The two type systems look close enough that the translation seems mechanical. It isn't, and the gaps are easy to miss because nothing fails loudly.

Camille Lawrence

Apollo GraphQL, Senior Software Engineer

Camille Lawrence

Apollo GraphQL, Senior Software Engineer

GraphQL as the Execution Layer for AI Agents

December 2, 16:30 – 16:55

GraphQLAI Agents

Your next million API consumers won't be developers. They'll be AI agents. And they don't read documentation, parse hypermedia links, or guess which of your 200 REST endpoints returns the data they need.

Pascal Senn

ChilliCream, COO

Pascal Senn

ChilliCream, COO

Houston, We Have a Partial Response: GraphQL Error Handling

December 3, 10:15 – 10:40

GraphQL

Your REST instincts are lying to you. In GraphQL the status code is almost always 200, errors travel in an array alongside your data, and one null in the wrong place can wipe out the entire response. Welcome to the partial response: a successful failure.

Željko Kozina

Chronomill, Technical Architect

Željko Kozina

Chronomill, Technical Architect

GraphQL with AWS AppSync - Building a Product API at HEMA

December 3, 12:00 – 12:25

GraphQLAWS AppSync

I will talk about "pioneer phase" of GraphQL adoption at HEMA and using AWS AppSync for the composable commerce migration, where I will share the raw and honest lessons learned when introducing a new tech stack to a 100-year-old Dutch icon.