Legacy software modernization
We audit your old system, decide with you what to keep and modernize it in phases, without stopping the business. From €2,000 + VAT.
01 — What we do
Legacy modernization services we provide
- 01
Legacy codebase audits
We review the existing code, architecture, and infrastructure to map what's stable, what's fragile, and what's driving the most operational risk.
- 02
Incremental modernization vs. full rewrite
Using a strangler-fig style approach where it fits, we replace pieces of the system gradually behind stable interfaces, reserving a full rewrite for cases where the audit shows it's genuinely the safer path.
- 03
Database & data migration
We plan and execute data migrations with validation at each step, so historical data and referential integrity survive the move.
- 04
Framework & language upgrades
We bring outdated frameworks, runtimes, and languages current, sequencing the work so the application keeps functioning throughout.
- 05
API-layer modernization
We wrap or rebuild the API layer around legacy systems so newer services, integrations, and front ends can connect without touching the old internals directly.
- 06
Risk-managed rollout without downtime
Changes ship in phases with rollback points, so the business keeps running while the underlying system changes.
02 — When
When companies come to us for legacy software modernization
The codebase is too fragile to add features safely. Every change risks breaking something unrelated, and the team has started avoiding touches to certain parts of the system entirely.
The original developers or vendor are gone. Nobody left on the team, or at the vendor, fully understands how parts of the system work, and documentation hasn't kept up.
The system runs on outdated or unsupported technology. Frameworks, languages, or infrastructure have reached end of life, creating security exposure and making it hard to hire for.
You need to migrate off legacy infrastructure without downtime. The business depends on the system running continuously, so any legacy code migration has to happen in stages, not as a single cutover.
04 — Process
Our legacy modernization process
- 01
Codebase audit
We go through the existing system, dependencies, and infrastructure to understand what's actually there, not just what the documentation claims.
- 02
Risk assessment
We identify where the system is most exposed: security gaps, unsupported dependencies, single points of failure, and knowledge that exists only in one person's head.
- 03
Modernization plan
Based on the audit, we lay out whether incremental modernization or a full rewrite is the right call for each part of the system, with reasoning either way.
- 04
Phased migration
We move the system forward in stages, keeping old and new components interoperable during the transition.
- 05
Testing
Each phase is tested against the existing system's real behavior, not just the intended behavior, since legacy systems often carry undocumented business logic.
- 06
Rollout
We release changes with monitoring and rollback plans in place, so issues surface early and don't reach end users.
05 — Frequently asked questions
Frequently asked questions
It's the process of updating an existing software system, its code, architecture, infrastructure, or all three, so it can keep supporting the business without the growing cost and risk of running on outdated foundations.
06 — Contact
Tell us what you need
We reply with a proposal.