Geoffrey De Smet | Voxxed Days

Voxxed Days Zurich 2019
on Tuesday 19 March

Geoffrey De Smet is the founder and lead of OptaPlanner (, the open source A.I. constraint solver in Java that is used across the globe to automatically solve employee rostering, vehicle routing, task assignment, maintenance scheduling and other planning problems.

See also

A.I. constraint optimization with OptaPlanner: TSP, Vehicle Routing and Employee Rostering


The world is full of planning problems, such as the Vehicle Routing Problem and Employee Rostering. And humans aren’t very good at planning them efficiently. Constraint solving algorithms do a much better job: they reduce expenses, minimize fuel consumption and improve employee retention.

In this technical session, I’ll explain the use cases, the basic code, the nuances of hard and soft constraints, incremental score calculation, continuous planning and real-time planning.

OptaPlanner is an open source constraint solver in Java that is used across the globe by governments, nonprofits and companies ranging from startups to Fortune 500 companies.

Make sure to download the Android or iOS mobile schedule.