Scaling Vanta-like Compliance for a FinTech at Series B
We migrated a fragile monolith to microservices on GCP and added an LLM-powered audit trail — reducing compliance overhead by 60% and cutting audit prep from 3 weeks to 2.5 days.
60%
Compliance overhead reduced
8×
Faster audit prep
99.95%
Platform uptime
4 min
Deploy time
Compliance was killing velocity.
The client — a B2B payments platform processing $800M annually — had just closed a $22M Series B. Their investors required SOC 2 Type II certification within 6 months. The problem: their monolithic architecture made audit evidence collection a manual nightmare consuming 40 hours per week of engineering time.
Worse, the monolith was becoming a competitive liability. Deployment took 45 minutes, rollbacks were terrifying, and two senior engineers had already quit citing "technical debt fatigue." The Series B was both an opportunity and a deadline.
The process
Monolith Audit & Migration Plan
We spent three weeks inside the existing codebase — a 6-year-old Node.js monolith with 340,000 lines of code and zero test coverage. We mapped every domain boundary, identified the 4 highest-risk extraction candidates, and built a migration roadmap that allowed parallel development without a big-bang rewrite.
Domain boundary map Risk-ranked migration roadmap Strangler fig pattern design Test coverage baseline
Microservices Extraction on GCP
We extracted services incrementally using the strangler fig pattern — starting with the compliance reporting domain, then user management, then the audit trail engine. Each service was deployed to GCP Cloud Run with independent CI/CD pipelines, and the monolith continued running in parallel throughout.
5 extracted microservices GCP Cloud Run deployment Independent CI/CD per service Service mesh with Istio
LLM-Powered Audit Trail
The most innovative piece: an LLM-powered audit trail that automatically classifies compliance events, generates plain-English summaries for auditors, and flags anomalies in real time. Built on Vertex AI with a custom fine-tuned model trained on 50,000 historical compliance events from the client's own data.
Vertex AI fine-tuned model Real-time event classification Auditor-facing summary UI Anomaly detection pipeline
Cutover & Compliance Certification
A zero-downtime cutover executed over a long weekend, with the monolith decommissioned 72 hours later. The new platform was immediately submitted for SOC 2 Type II audit — which the client passed in 6 weeks, their fastest certification ever. The LLM audit trail was cited by auditors as "best-in-class documentation."
Zero-downtime cutover Monolith decommission SOC 2 Type II submission Auditor documentation package
Results at a glance
60%
Compliance overhead reduced
from 40 hrs/week to 16 hrs/week
8×
Faster audit prep
from 3 weeks to 2.5 days
99.95%
Platform uptime
post-migration SLA
4 min
Deploy time
down from 45 minutes
Stack used
Cloud
- GCP Cloud Run
- Cloud SQL
- Pub/Sub
- Cloud Armor
AI/ML
- Vertex AI
- Gemini Pro
- BigQuery ML
- Dataflow
Backend
- Node.js
- Go
- gRPC
- PostgreSQL
Compliance
- SOC 2 controls
- Vault (secrets)
- Istio mTLS
- Cloud Audit Logs
“The LLM audit trail alone saved us the entire engagement cost in the first quarter. Our auditors called it the most well-documented compliance system they'd seen at a Series B company. KeeMinds fundamentally changed how we think about compliance as a product feature.”
Priya Nair
VP Engineering, Confidential FinTech
From monolith to microservices.
Whether you're facing a compliance deadline, scaling bottlenecks, or a legacy architecture that's slowing your team — we've done this before.