Sqills GmbH provides S3 Passenger, a mission‑critical SaaS software suite for rail and bus carriers and ticket distributors. The platform handles inventory, reservations and ticketing, multi‑channel sales, pricing and revenue‑management features, and integrates with external systems via APIs. The company offers implementation and migration services, operates the solution on cloud infrastructure with security certifications (including PCI DSS Level 1) and provides ongoing 24/7 monitoring and support.