Phaedra Solutions transformed an outdated event operations platform into a faster, more stable, and more scalable system through legacy application modernization.
The client’s old Ruby on Rails application had become a business risk (too slow, AWS infrastructure costs up to $22K/month, couldn’t handle mass communication). To fix this, Phaedra Solutions delivered a phased Ruby on Rails to NestJS migration and optimized the cloud infrastructure.
Outcome: 500K+ event messages delivered, cloud spend reduced from $22K to $9K, $132K in
annual savings, and a stronger foundation built without a full rebuild in 14 days.
This legacy application modernization case study shows how Phaedra Solutions helped an event operations company replace an aging Ruby on Rails foundation that had become slow, buggy, and unreliable under pressure. Instead of a disruptive rebuild, we delivered a phased Ruby on Rails to NestJS migration and broader legacy system upgrade that improved stability, reduced bugs, lowered AWS spend, and created a stronger base for future scale.
The result was not just a technical refresh. It was a practical enterprise application transformation that made the platform easier to maintain, safer to release, and better prepared for high-volume event operations.
500,000+ messages successfully delivered during a live event
14 days to design, build, and deploy a custom high-throughput SMS system
$22K/month → $9K/month in initial infrastructure cost reduction
~$132K annual savings after infrastructure optimization
50 Twilio numbers provisioned to bypass SMS throughput bottlenecks
Phased modernization completed without forcing customers off the platform
The platform supports live event operations through a centralized command-and-control environment. It allows teams to log security, medical, site, and guest incidents, communicate in real time, upload media, notify staff, filter incident data, and generate PDF reports for post-event analysis.
In short, this was a business-critical operational system. When it slowed down or failed,
teams felt it immediately.
The old application was built on an outdated Ruby on Rails framework. Over time, that created a serious business risk:
The platform became slow and buggy
It struggled during live events with heavy traffic
Crashes became harder to prevent as usage increased
Releases became more fragile
Infrastructure costs kept rising as the architecture became more complex
The client needed to improve application performance, but patching the old system was no longer enough. The product needed real modernization, not another round of short-term fixes.
The system was already in active use, so the client could not afford a sudden cutover, major downtime, or customer disruption. At the same time, the architecture had become too rigid to support growth. The real challenge was balancing speed, risk, and continuity.
The deeper issue was architectural. The product needed careful software re-engineering, including a phased monolith to microservices migration, so the team could modernize the platform while keeping the business running.
Phaedra Solutions approached the work as a phased transformation, not a big-bang replacement.
Procured 50 Twilio numbers to distribute traffic & built a custom SMS queue with AWS SQS
Added throughput controls and number rotation & optimized delivery pipeline for messaging
Migrated workloads to Amazon EKS & implemented infrastructure as code with Terraform
Implemented Infrastructure as Code with Terraform & reduced Aurora from 3 clusters to 2
The client did not just need a team to ship features. They needed a partner who could modernize a fragile live system without creating new business risk.
They chose Phaedra Solutions because we offered:
A phased modernization approach instead of a risky rebuild
Strong backend development experience for complex business systems
Practical software modernization solutions tied to cost, stability, and scale
A team that could act as more than a typical NestJS development company by handling architecture, migration planning, cloud optimization, and release safety together
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To reduce risk, we delivered modernization in controlled phases.
Instead of shutting down the old system and replacing it all at once, we upgraded the platform module by module. That approach allowed the product to stay live while modernization moved forward in parallel.
Incremental releases
Safe migration sequencing
Production stability during active customer use
Fast feedback between engineering and operations
Preserving the user experience while modernizing the foundation
This is the path we followed:
A modernized web application for event operations and incident management, including real-time communication, staff notifications, filtering, media uploads, and reporting workflows already central to the product.
A phased backend rebuild using NestJS and TypeScript
Better-structured services designed for scalable backend systems
Infrastructure modernization across compute, database, Kafka, Redis, and non-prod environments
A staged deployment model on AWS to reduce rollout risk and support controlled release expansion.
A stronger technical base for future web application scalability
The business outcomes were clear:
This is what effective legacy application modernization looks like when it is tied to business outcomes, not just code cleanup.
Outdated Ruby on Rails foundation
Slow, buggy behavior during daily use
Crashes during high-traffic live events
Messaging throughput limits during mass communication
Rising AWS costs from inefficient infrastructure
Hard-to-scale architecture that slowed future development
Stable, modular backend built for growth
Better release confidence and lower operational risk
High-volume messaging support during live events
Lower infrastructure spend through smart consolidation
Stronger foundation for future product modules
A more reliable platform that could support continued expansion
Cloud Spend
Mass Event Messaging
Platform Stability
$22K/month
100 messages/minute per number
Frequent crashes during peak usage
$9K/month initially
500,000+ messages delivered during a live event
Stable, modular platform
~$132K annual savings
Supported high-traffic event communication at scale
Safer releases and fewer disruptions
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Many teams assume modernization means a full rewrite. This project proves otherwise.
Phaedra Solutions used legacy application modernization to improve the system in place, protect live operations, and remove the highest-risk technical bottlenecks first. That approach lowered migration risk, reduced customer disruption, and created a smarter path to long-term growth.
For this client, the right answer was not rebuilding everything. It was targeted modernization with better sequencing, better architecture, and better business outcomes.
If your product is still running on an outdated framework, struggling under live traffic, or costing more every month to maintain, the answer is not more patchwork. It is a clear modernization plan backed by the right architecture, migration strategy, and delivery team.
Our legacy application modernization services help teams stabilize fragile products, plan safer migrations, reduce infrastructure waste, and build a stronger base for future development.
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