Legacy System Assessment
We audit your legacy applications, databases, and dependencies to quantify technical debt, security exposure, and modernization options. The output is a scored report with a phased plan ranked by business risk and ROI.
Custom Software
Legacy Software Modernization
Upgrade legacy systems without disrupting your business.
We migrate monoliths to microservices, refactor outdated codebases, and move on-prem workloads to the cloud — with phased rollouts that keep operations running.
Our Offerings
Legacy Software Modernization Services We Provide
Replatforming & Rehosting
We move legacy workloads to modern cloud infrastructure — AWS, Azure, or GCP — with minimal code change and zero data loss. Lift-and-shift, containerization, or managed-service adoption is chosen per workload, not as a one-size-fits-all approach.
Code Refactoring & Re-architecture
Monoliths are incrementally decomposed into maintainable services using the strangler fig pattern, so the business keeps running throughout. We modernize VB6, classic ASP, legacy Java, PHP 5, and AngularJS systems into current, supported stacks.
Database Modernization
We migrate aging databases — Oracle, DB2, SQL Server 2008, FoxPro — to modern engines like PostgreSQL and cloud-managed databases with validated, reversible migration scripts. Data integrity checks run at every stage with full rollback plans.
UI/UX Modernization
Outdated desktop and web interfaces are redesigned into responsive, accessible experiences your users actually enjoy. We preserve the workflows your teams know while eliminating the friction that slows them down.
Knowledge Recovery & Documentation
When original developers are long gone, we reverse-engineer undocumented systems and produce current architecture diagrams, data dictionaries, and runbooks. Your institutional knowledge stops living in one retiring employee's head.
What We Deliver
End-to-End Legacy Software Modernization
- Code audit & mapping
- Strangler-fig migration
- Database modernization
- API layer extraction
- Zero-downtime cutover
- Knowledge transfer
Why Choose Devlex
Business Outcomes That Matter
✓Lower maintenance costs
✓Improved performance
✓Better security posture
✓Easier hiring & scaling
Technologies
Tools & Stack We Use
We pick the right technology for your goals — not the trendiest framework.
- .NET
- Java
- Python
- Kubernetes
- Docker
- PostgreSQL
Our Approach
- Discover — Understand goals & constraints
- Design — Architecture & UX blueprint
- Build — Agile sprints with weekly demos
- Launch — Deploy, test & support
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How We Work
What You Get In Writing
Terms that go into every agreement we sign. See all client commitments.
A Written Price Before Work Starts
Every job gets a scope and a number in writing first — a fixed price for defined work, or an hourly rate with a capped estimate. If scope changes, we re-quote before we build, not after.
You Own the Code
Source code, designs, and data are yours. We work in your repository where possible, hand over full documentation, and transfer everything at the end. No license fees, no hostage situations.
NDA Before You Share Anything
We sign your NDA — or send ours — before the first technical conversation. Your idea, your data, and your customer information stay confidential during and after the engagement.
FAQ
Legacy Software Modernization — FAQs
Everything you need to know before starting your project. Still have questions? Talk to our team.
We modernize VB6, Delphi, classic ASP, legacy .NET Framework, Java 6-8, PHP 5, ColdFusion, AngularJS, and aging databases like Oracle, DB2, and SQL Server 2008. If it still runs your business, we can modernize it.
A single-application modernization typically takes 3-6 months; larger portfolio programs run in phases over 6-12 months. We deliver in increments, so you see modernized components in production within the first 8-10 weeks.
Assessments run $5K-$12K, single-application modernizations typically cost $30K-$70K, and complex enterprise migrations can reach $80K+. The assessment phase gives you a precise estimate before you commit to the full program.
No — we use parallel-run and strangler patterns so the legacy system stays live until each modernized component is verified in production. Cutover happens in controlled windows with tested rollback plans.
You own all source code, migration scripts, architecture documentation, and runbooks we produce. We also train your internal team so you are never dependent on us to operate the new system.
Yes. We routinely build API layers around systems that must stay — payroll, ERPs, industry-specific tools — so modernized and retained components work together cleanly. Integration is planned in the assessment, not improvised later.
Related Services
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Get a free consultation and a detailed project estimate within 24 hours.