Case Study: ADP achieves a fast, reliable, scalable mobile app for 1M+ users with MongoDB

ADP Meets Mobile Demands One Innovative App at a Time

ADP, a $10B payroll and HR outsourcing company serving 41,000 organizations, needed a signature mobile app to give employees instant access to pay, benefits, time off, and related services. The challenge was to build a 100% reliable, super‑responsive, highly scalable app that could support millions of users, evolve quickly with customer needs, and avoid the cost and rigidity of legacy relational systems.

ADP adopted MongoDB’s document model to get in‑memory speed, rich queries, native replication for high availability, and lower costs on commodity hardware, while simplifying development by eliminating ORM overhead. The result: ADP Mobile Solutions launched to over one million users worldwide, rose to the top of app‑store rankings, delivered zero downtime and reduced operational costs, and now leverages real‑time click analytics and predictive caching to personalize and optimize the user experience.

ADP