Rebuild the core, without disrupting the business
We modernize critical systems in phases — improving performance, scalability, and maintainability while keeping your operations running throughout.
You need this when
Scaling is becoming impossible
Adding capacity requires disproportionate effort and cost.
The system is a single point of failure
One component failing brings down the whole platform.
New features take too long to ship
The monolith or tightly coupled architecture slows everything down.
AI integration keeps failing
Your data model and architecture can't support modern AI pipelines.
Operational costs are out of control
The system requires constant maintenance just to stay running.
What you get
Phased Rebuild Plan
A step-by-step modernization plan that sequences rebuilds to minimize risk and maximize impact.
Architecture Before/After
A clear view of your current architecture and the target state — with every change justified.
Performance Benchmarks
Measured improvements in load, latency, and throughput at each phase completion.
AI-Ready Pipeline
A data and service architecture that can support real AI integration in production.
Engineering Velocity
Measurable improvement in deployment frequency and feature lead time.
How it works
Assess
We start with a deep-dive diagnostic (or use your existing audit). We identify the highest-risk, highest-impact components to modernize first.
Phase & Plan
We sequence the rebuild across phases, defining clear milestones, rollback strategies, and go/no-go criteria for each.
Rebuild
We rebuild each component in parallel with the live system, using feature flags and traffic splitting for zero-downtime transitions.
Validate & Enable
We validate performance, stability, and correctness at each phase — then hand off documentation and runbooks.
Results speak for themselves
We've modernized over 80 systems and products, helping teams move faster and making them ready for the next era of technology.
Talk directly to one of our leaders about your challenge
“Our platform was becoming harder to scale and slower to evolve. Eli5 reworked the core architecture and gave us a system that's faster, more stable, and ready for what's next.”
Eric Kickert
CEO, Peecho
CEO, Peecho
Founder, A-Insights
“Our system was holding back internal operations and product development. Eli5 modernized the foundation, simplifying complexity and enabling us to move faster with far less friction.”
Bart Zirschky
Founder, A-Insights
“We started with a system that wouldn't support where we wanted to go. Eli5 rebuilt it at the core, giving us a scalable foundation that makes building and evolving the product significantly easier.”
Niek Delis
CEO, Typejust
CEO, Typejust
Let's talk about your system
Tell us what you're working with and we'll help you figure out where to start.
hello@restacked.ioCommon questions, clearly answered.
Still have questions about modernizing your system? Talk to one of our leaders directly.
Contact us