Strangler Fig Migration for Regulated Systems: The Pattern That Preserves Compliance

Day 1

BAA coverage must extend to new services from the first day they process PHI â€” not at migration completion

The Strangler Fig pattern â€” incrementally replacing a monolith by routing traffic to new services as features migrate â€” is well-suited to regulated systems because it avoids big-bang cutover risk. But applying it to HIPAA or SOC 2 regulated systems requires additional controls: the audit trail must remain continuous as data moves between old and new architectures, BAA coverage must extend to new services from day one, and feature flag architecture must support rollback without creating compliance gaps. The 'compliance void' between the old and new system during migration is where most regulated Strangler Fig implementations fail.

Full article content coming soon.

Compliance Engineering

The engineering behind this article is available as a service.

We have done this work — not advised on it, not reviewed documentation about it. If the problem in this article is your problem, the first call is with a senior engineer who has solved it.

Talk to an Engineer See Case Studies →

Strangler Fig Migration for Regulated Systems: The Pattern That Preserves Compliance

EU AI Act: What CTOs Actually Need to Do Before August 2026

What Happens to Your HIPAA BAAs When You Migrate to Cloud

The Vendor Rescue Pattern: How to Recover a Failed Implementation in 12 Weeks

The engineering behind this article is available as a service.