Why systems inevitably reach the end of their life cycle
No system is intentionally designed to be a bottleneck. It happens as a result of many decisions made over the years: a hotfix here, an exception there, a dependency that no one fully understands anymore. Eventually, everything becomes interconnected: search, checkout, catalog, order management. Nothing can be changed without jeopardizing the rest. This situation, which has developed over the years, can only be resolved through decoupling.
Three options: none of them are convincing
The dilemma is real. But it’s based on a false assumption: that those are the only three options.
Carry on as before?
The gap is widening. Management is asking more and more often why the competition delivers faster. Your best developers are wasting their energy on workarounds instead of creating value.
Replace everything at once?
It takes 18 months of development before the first production system goes live. Costs and complexity are rising, and a rollback is virtually impossible. And the team responsible for keeping the system running is expected to build a new system at the same time.
Should we involve external partners?
Handing over control to someone who doesn't understand your system. Relying on a service provider instead of the monolith.
Phased migration
Deliver quickly again, even in a system that has evolved over the years. You don’t have to replace everything at once to do so. We systematically resolve the dependencies that currently slow down every change—one functional area at a time: search, checkout, product catalog, order management, the entire customer journey—in the order that addresses your biggest pain points first.
This way, the monolith shrinks while the new system grows in parallel until the last dependency is resolved, without operations ever coming to a complete standstill.
What are the benefits of modernizing?
The following benefits illustrate what a well-planned modernization can achieve, depending on your company’s current situation, architectural strategy, and priorities.
Reduce maintenance costs
Monolithic systems result in high maintenance costs. Every minor change requires regression testing, coordination, and risk assessment. On top of that, there are platform licensing fees that scale with revenue. Both of these costs can be structurally reduced through a cleanly decoupled architecture.
Improve efficiency
With a decoupled operational setup, changes can be implemented independently without having to consider the broader system context. Features are developed in days, not quarters.
Remain competitive
Stay ahead of the competition. Delivery capability plays a major role. Improving it means staying competitive. And delivery capability in the digital realm is only possible with a solid foundation of best practices and technology.
Today, AI agents can also analyze systems that have evolved over decades. This makes it possible to visualize dependencies, identify components, and isolate them systematically. This forms the basis for an effective migration strategy. While a well-designed architecture is not a prerequisite, it does significantly speed up the process.
Four steps, but not a shot in the dark
Before we write a single line of code, we make sure we understand your system. Only then do we decide together which approach is the right one.
Software Analysis & Assessment
We analyze your existing system landscape: dependencies, bottlenecks, technical debt, and the areas that are currently causing the most problems.
Modernization Strategy
The analysis results in a prioritized roadmap: which domains to tackle first, which architectural patterns to use, and what timeframe to follow—all tailored to your budget and business priorities.
Structural improvements
Before individual domains are phased out, we lay the groundwork: CI/CD, test coverage, clear team boundaries, and API boundaries—both technically and organizationally.
Gradual replacement
Domain by domain, the monolith is being replaced. Using the Strangler Fig pattern, with no downtime. Each step is independently deployable, measurable, and reversible.
Three levels of controlled modernization
Architecture means something different depending on the level. A controlled modernization addresses all three levels simultaneously, each with its own distinct patterns.
Macroarchitecture — Domain Boundaries, Data Sovereignty, System Boundaries
Self-Contained Systems
Each decoupled domain becomes a self-contained system: its own data sovereignty, its own deployment, its own business logic. No shared database, no hidden dependencies. This is the target state toward which every modernization step is working.
API Boundary as a Decoupling Interface
Before a system component is decoupled, it is encapsulated behind a clean API boundary. The new implementation takes over the exact same interface. The rest of the system doesn’t notice a thing. This avoids a big-bang cutover, resulting instead in a controlled switchover with defined rollback options.
Code Level — Internal Quality, Testability, Migration Patterns
Dual Data Entry Instead of an All-Night Migration
During the transition phase, critical data is written to both the old and new systems in parallel. Only once the new system has been verified as stable will the old one be decoupled. No migration script that has to run at 3 a.m. No data loss due to overlooked edge cases.
Structural Prerequisites
Before domains are replaced, we lay the groundwork in the code: automated tests, CI/CD pipelines, clear module boundaries. Without this foundation, every replacement is a blind flight with incalculable risk.
Infrastructure — Deployment, Routing, Operations
Routing Proxy with a Shared Design System
A central frontend proxy routes requests simultaneously to both old and new system components. The user does not notice the transition. The shared design system ensures visual consistency, regardless of whether a page still originates from the monolith or is already delivered as a self-contained system.
Independent Deployment per Domain
Each self-contained system is deployed independently, without coordination with other teams or systems. Releases become smaller, more frequent, and lower-risk. The infrastructure mirrors the architecture: what is separated at the design level is operated separately.
What sets us apart from replatforming agencies
We are an engineering partner, not a systems integrator. We do more than just supply products and provide consulting services.
No new vendor lock-in
Open-source foundation, no usage-based license fees. What we build belongs to you and is fully portable.
Delivery, not just advice
Over 120 developers in Bremen. We implement architectural decisions ourselves. No subcontractors, no offshoring.
Long-term partnership
More than ten of our client relationships have lasted over 10 years. We don’t consider our work done until the system has grown alongside your business.
References
Start with
an initial legacy assessment!
We’ll interview three to five people at your site (IT, business units, decision-makers), review your key systems, and identify your biggest pain points.
You will then receive a report with a prioritized list of issues and three realistic options for addressing them, including rough cost and time estimates.
