Monolith-to-Microservices Migration Playbook

Overview

Datasite's technical transformation moved a monolithic application running on Oracle to a microservices architecture, in step with the org redesign in Org-Architecture Mirroring (Squads ↔ Microservices). Two specific tactics stood out:

Pivotal Cloud Foundry as "training wheels for microservices" — adopted as a PaaS layer specifically to absorb the operational complexity of running microservices (deployment, scaling, service discovery) while the organization was still learning the pattern, rather than asking newly-formed squads to build that operational maturity from zero on day one.
MongoDB migration with outside-expert mentoring — an external expert was brought in to mentor the MongoDB migration rather than attempting it as a purely internal, self-taught effort.

The measurable outcome: release cadence moved from roughly quarterly to about 20 deployments a day with no customer impact — the clearest hard metric of the transformation's technical success, and the platform-side precondition for the org to run as small, autonomous squads instead of coordinating one large release train.

Oracle Monolith → Shared Modular Infrastructure

At Datasite, the migrated system was a monolithic Oracle-backed application. The rebuild targeted not just a single replacement product but a repeatable modular infrastructure and API pattern — described from inside as 'building the plane as we are flying' — so that multiple future products could share the same modular services rather than each getting a bespoke rebuild. See Pivotal Cloud Foundry as Microservices "Training Wheels" and Database Modernization via External Expert Mentoring for the specific tooling and staffing choices used to execute this.

Из тем: Transformation in Practice