Legacy software modernisation — Europe
Modernise legacy software — GDPR-safe, EU-hosted, zero downtime. From COBOL to Kotlin.
European banks, insurers, industrials and public sector orgs trust us to modernise mission-critical software incrementally — with EU data residency and full GDPR compliance.
Modernising legacy systems for European banks, insurers & industrials
70+
EU legacy systems modernised
EU
Data residency by default
0
Post-migration outages
ISO 27001
Aligned delivery
Why European enterprises modernise with us
01
GDPR-safe migrations
Data mapping, pseudonymisation and consent handling built into every migration wave — no post-hoc audits.
02
DORA & NIS2 ready
Operational resilience, incident reporting and third-party risk controls aligned to DORA and NIS2 from day one.
03
Local hosting options
AWS Frankfurt/Ireland, Azure West Europe, OVHcloud, IONOS — you choose the region, we deliver.
04
Multi-language by default
EN, DE, FR, ES, IT, NL, PL and Nordic locales — i18n architecture, not last-minute translation.
Modernise legacy software without the big-bang risk
Legacy audit & risk map
Codebase, dependency, security and business-risk audit with a prioritised remediation plan.
Incremental replatforming
Strangler-fig migrations from monolith to modular services — no big-bang rewrites, no downtime.
UI/UX overhaul
Rebuild dated interfaces on a modern design system while preserving muscle memory for existing users.
Cloud migration
On-prem to AWS/Azure/GCP with observability, autoscaling and FinOps built in from day one.
Test & CI/CD retrofit
Add characterization tests, pipelines and rollback so change stops being scary.
Team upskilling
Pair-programming, code reviews and playbooks so your in-house team owns the modern stack.
ROI Calculator
Estimate what modernising your legacy stack could return
Legacy software quietly bleeds budget through maintenance, downtime and slow releases. Model your recovery.
USD
hours
USD/hr
weeks
Maintenance savings / year
$240,000
Avoided downtime cost / year
$336,000
Total year-1 impact (USD)
$852,923
Includes maintenance reduction, avoided downtime and recovered release velocity.
Model based on typical outcomes across 60+ modernisations. Your figures will vary — book a call for a precise audit.
From legacy audit to modern platform — safely
01
Legacy audit
Code, data, dependency, security and business-risk audit.
02
Modernisation plan
Phased roadmap: what to strangle, what to rewrite, what to leave alone.
03
Foundations
Testing, CI/CD, observability and cloud landing zone before touching business logic.
04
Increment & migrate
Slice-by-slice replacement behind feature flags with zero downtime.
05
Retire & optimise
Decommission legacy, optimise cost and hand off to your team.
“
Kilobyte modernised our claims platform across 7 European markets with zero regressions and full GDPR compliance.
Insurance
Software modernisation FAQs
No. We start with the highest-risk, highest-value slices and use the strangler-fig pattern — most engagements keep 60–80% of existing code initially.
Our modernisation approach is zero-downtime by design — feature flags, dark launches and canary rollouts.
Java, .NET, PHP, Python, Node, ColdFusion, VB6, mainframe COBOL/JCL and everything in between — we have modernised them all.
Fixed-price audit + time-and-materials or milestone-based delivery. We share risk on outcomes for larger programmes.
Legacy holding back your European ambitions? Let's modernise, safely.
Book a technical audit or send your legacy brief — response within 1 CET business day.
Prefer to talk?
Book a no-obligation 30-minute call with a Kilobyte lead. We usually respond within 1 business day.
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