Software modernization services: legacy systems modernised in steps, without stopping the business.
We take over systems the business depends on and nobody wants to touch — an old .NET or Java application, a monolith on a server in the office — and modernise them piece by piece while they keep running. Senior engineers assess the code first, put tests around what works today and replace the fragile parts in an order that keeps risk and cost visible.
What do software modernization services include?
Software modernization services turn a legacy system into one your team can change safely, without a big-bang rewrite. The work starts with an assessment of the code and its risks, then tests around the behaviour that works today, so every later change can be checked against it. From there we stabilise what is fragile, extract the parts that hold the business back and replace them piece by piece, with the old and the new system running side by side until each piece is proven.
Each step ships to production on its own, so value arrives along the way rather than at the end. You finish with the code in your own repository, documentation and a handover your team — or another provider — can run without us.
Rewrite or modernise in steps? How we decide
We modernise in steps when the system still does its job and the risk sits in specific parts — a fragile module, an unsupported framework, a database nobody can change. A full rewrite is the cheaper path only when the code is beyond repair and the behaviour is simple enough to specify again; when that is the case, we say so and scope it honestly. Either way, the decision is written down after the assessment, with the cost of each option.
Software product modernization: customers stay live while the stack changes
When the system is a product with live customers, they should not notice the work. New parts ship behind feature flags and are switched on gradually; data is migrated with reconciliation checks that compare old and new before anything is switched over; and cutovers are planned to keep downtime to a minimum, with a way back if a check fails.
Tech stack modernization: .NET, Java/Spring Boot and on-prem to a stack your team can run
Typical starting points are .NET or Java applications on Spring Boot, often running on servers on-premises. The usual moves are upgrading the framework, packaging services in Docker, running them on Kubernetes or a managed service on AWS or Azure, and writing new parts in TypeScript and Node.js where that suits the team. We pick the target stack your team can run after handover, not the one we would find most interesting.
How much does software modernization cost?
Modernization is priced after the assessment, at a fixed price for the agreed scope, and most of our projects land between €15k and €50k. Larger systems are split into milestones, each priced and shipped on its own, so you can stop after any of them with working software. What moves the number is the size of the codebase, how much of it already has tests and how many systems depend on it.
We map your current workflow and identify the highest-impact build.
Architecture and scope, fixed before we write production code.
Senior engineers ship week by week, with a demo every Friday.
Measured against the metric we agreed on — and tuned until it holds.
It depends on the size of the system and how much of it has to change, so we give a timeline after the assessment, not before. The work is split into milestones that each ship to production on their own, so the first improvement is live well before the last step. A larger system is a sequence of these milestones, each one signed off before the next starts.
Yes, it is a common starting point for modernization. We begin with an assessment of the code, the infrastructure and whatever documentation exists, then put tests around the behaviour the business relies on before changing anything. If the previous vendor is still available, a short handover helps; if not, the assessment and the tests are how we learn the system.
No. Cloud migration is one option, not a requirement. Some systems are better kept on your own servers for cost, latency or data-residency reasons, and still benefit from containers, automated deployments and tests. When moving to AWS or Azure is worth it, it becomes one step in the plan — with its running cost estimated before you commit to it.
You do. The code, the repositories and the IP are yours from day one, and the modernised system is handed over with documentation and a runbook your team can run without us. No lock-in, and nothing to unwind if you later take the work in-house or move to another provider.
Web development services for B2B and engineering companies: web apps, portals and internal tools built by senior engineers in React, Next.js and Node.js.
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Talk directly to a principal engineer.
No sales team.
No discovery workshops.
No procurement circus.
We scope, build and ship.
- Reply within one business day
- Engineer-led assessment
- Written proposal
- Lisbon · UK time zone
No commitment. Just an engineer.