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180%

Revenue Growth

65%

Faster Load

40%

Less Abandonment

Client Overview

Meet Meridian Bank

A leading regional bank serving 1.8 million customers across 6 U.S. states — built over 34 years on a core infrastructure that was never designed for the cloud era.

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The Challenge

A 12-Year-Old Monolith Holding a $840M Business Hostage

"We were deploying twice a year and praying nothing would break. Every release was a 72-hour all-hands war room. We knew we were one bad deploy away from a crisis we couldn't recover from."

Catastrophic Release Risk Deployments took 6–8 hours of downtime windows. Any rollback required full database restores. 2 failed releases in 2022 caused combined 14 hours of customer-facing outages.
Ballooning Infrastructure Cost Over-provisioned on-premise hardware costing $5.5M annually — with 60% utilization at peak and 15% during off-hours. No elasticity, no cost-control mechanism.
Tightly Coupled Business Logic 27 core services entangled in a single codebase. A change to the loan module required full regression testing of the entire system — 3–4 weeks per release cycle.
Regulatory Compliance Pressure OCC and FFIEC required documented disaster recovery with RTOs under 4 hours. The existing architecture couldn't meet this standard without a complete rebuild.
Engineering Talent Drain Senior engineers were spending 70% of their time on maintenance and incident response. 6 engineers resigned in 18 months, citing the "legacy tax" on their professional growth.
Zero Mobile Parity Competitor neobanks were shipping features weekly. Meridian's mobile app lagged 18–24 months behind. Customer acquisition from the 25–40 age demographic had dropped 31% YoY.
Our Solution

The Strangler Fig Strategy — Migrate Without Stopping the Business

Rather than a risky "big bang" rewrite, we applied the Strangler Fig pattern — systematically carving out domain services from the monolith and replacing them with cloud-native equivalents, one at a time, with zero customer disruption.

1
Domain Mapping & Bounded Context Design

We spent 6 weeks with Meridian's domain experts mapping 27 tightly coupled modules into 9 bounded contexts using Event Storming workshops. This became the blueprint for every subsequent architectural decision.

Event Storming Domain-Driven Design MIRO Workshops ADR Documentation
2
AWS Landing Zone & Security Baseline

Built a multi-account AWS Organization with guardrails meeting FFIEC, SOC2 Type II, and PCI-DSS requirements before a single service migrated. VPC architecture, IAM policies, and CloudTrail audit logging established as immutable foundations.

AWS Control Tower AWS Security Hub Terraform IaC GuardDuty PCI-DSS
3
Strangler Facade & API Gateway Layer

A new API Gateway (Kong) was placed in front of the monolith, acting as a traffic router. New microservices received traffic incrementally via feature flags — allowing real production validation before any monolith code was removed.

Kong API Gateway AWS API Gateway LaunchDarkly Envoy Proxy
4
Microservice Extraction & Event-Driven Architecture

9 domain services built with Node.js (TypeScript) and deployed on EKS. Kafka-based event bus decouples all services. Each service owns its data store — PostgreSQL RDS for transactional, Redis for caching, Elasticsearch for search.

Node.js / TypeScript AWS EKS Apache Kafka PostgreSQL RDS Redis gRPC
5
Observability Platform & Zero-Downtime CI/CD

Full-stack observability with Datadog APM, custom SLO dashboards, and PagerDuty alerting. Blue-green deployments via ArgoCD enabled rollbacks in under 90 seconds if any health check failed — eliminating the 6-hour deployment window forever.

Datadog APM ArgoCD GitHub Actions Sonarqube PagerDuty
API Gateway
EKS Cluster
Kafka Bus
RDS Postgres

Simplified Architecture Overview — Full diagram available in the technical brief

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Results & Impact

The Numbers That Changed the Boardroom Conversation

Measured 12 months post-migration against the pre-migration baseline. All figures independently verified during Meridian's annual technology audit.

$3.4M
Annual Infrastructure Savings
62% reduction vs. on-premise cost of $5.5M/yr. Payback period: 14 months.
10×
Deployment Velocity
From 2 releases/year (72hr windows) to 24+ releases/year with sub-30min deployments.
99.98%
System Availability
From 99.1% baseline. Translates to 63 minutes/yr max downtime vs. 47 hours previously.
90s
Rollback Time
Blue-green deployments with automated health checks. Down from 4+ hour manual rollbacks.
+340%
Engineer Productivity
Teams now ship 4.2 features/week vs. 0.9 pre-migration. 0 engineering attrition post-launch.
+31%
Mobile Customer Growth
25–40 demographic acquisition reversed: from −31% to +31% YoY within 12 months of new API capabilities.
Before vs. After

The Transformation in Black & White

The same engineering team. The same business objectives. The difference was architecture — and the courage to change it.

Before
2 deployments/year with 72-hour downtime windows
$5.5M/yr on over-provisioned on-premise servers
99.1% uptime (47+ hours downtime/year)
Rollback: 4+ hours of manual database restores
3-4 week regression cycle per any code change
OCC audit finding: inadequate DR capability
NexaCore
24+ deployments/year with zero-downtime blue-green deploys
$2.1M/yr on elastic AWS infrastructure (−62%)
99.98% uptime (63 minutes max downtime/year)
Automated rollback in 90 seconds via ArgoCD
Independent services ship without touching others
OCC audit: full compliance with RTO < 4hr requirements

NexaCore didn't just migrate our infrastructure — they transformed how our entire engineering organization thinks about software. The cloud migration was the most stressful initiative I've overseen in 22 years. They made it feel like a non-event. On budget. Ahead of schedule. Zero downtime. Frankly, remarkable.

Daniel Krause
VP of Engineering, Meridian Bank Corp.
Frequently Asked Questions

Questions Prospects Always Ask About Projects Like This

It depends on the complexity of your system, regulatory constraints, and team capacity. Typical mid-enterprise migrations run 6–12 months. Meridian Bank's took 9 months because of the zero-downtime requirement and OCC compliance obligations. Simpler environments can be migrated in 3–4 months. We provide a detailed scoping assessment in our first engagement week.
Zero downtime is achievable when the migration is designed correctly from day one. The key ingredients: Strangler Fig architecture (never cut-over all at once), blue-green deployments, feature flags for traffic shifting, and comprehensive automated testing at each stage. We achieved it for Meridian Bank over 9 months of active migration — and we've replicated this approach for 8 other enterprise clients since.
Enterprise cloud migration engagements at this complexity level typically range from $600K to $2.5M depending on team size, number of services, compliance requirements, and timeline pressure. Meridian's engagement delivered $3.4M/year in perpetual savings — a payback period under 14 months. We always build a business case with projected ROI before any contract is signed.
This is our most important deliverable after the code itself. Every engagement includes a structured knowledge transfer program, comprehensive runbooks, Architecture Decision Records, and hands-on pairing sessions with your engineers throughout the project. Meridian's team shipped 3 features independently within their first week post-handover. We measure our success by your self-sufficiency, not your dependency on us.
Compliance is built in as an architectural constraint from Day 1, not bolted on at the end. Our team includes dedicated compliance architects with certifications in AWS Security, PCI-DSS QSA, and HIPAA implementation. We maintain compliance-as-code frameworks that translate regulatory requirements into enforceable infrastructure policies via tools like AWS Config, CloudTrail, and Security Hub.
Absolutely. We have established partnerships with AWS, Google Cloud, Microsoft Azure, Datadog, Confluent (Kafka), HashiCorp, and 40+ other enterprise technology vendors. In most engagements, we also work alongside your existing system integrators, auditors, and internal teams — acting as the technical architecture authority while respecting existing relationships.
We've rescued several stalled or failing migrations. Our first step is a 2-week architecture assessment to diagnose the root causes and assess what can be salvaged. We've taken over projects that were 18 months in with nothing deployable, and delivered a working system within 4 months. It starts with a frank, confidential conversation — no pressure, no judgment.
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