AppCold

Legacy Solutions & Maintenance

Keep your legacy systems working for the future

Integrate, maintain, upgrade or fully modernize the systems your business still depends on — without stopping the business while we do it.

01

Legacy integration into AppUnified™

Old ERPs, in-house databases and tools without modern APIs still hold your most important data. We connect them to AppUnified™ so they work alongside everything else — without a risky rewrite.

  • API wrappers for systems without APIs
  • Direct database sync and change capture
  • File, FTP and EDI bridges
  • Message queues for reliable, two-way data flow

02

Specialized legacy maintenance

Systems nobody wants to touch still need care. We take over, document and keep them stable, secure and running while your business depends on them.

  • Security patches for end-of-life frameworks
  • Monitoring, alerts and on-call support
  • Documentation of undocumented code
  • Knowledge transfer from departing developers

03

Upgrades over legacy code & systems

Step-by-step upgrades that extend the life of what you have, keeping the system online and your team productive while we work.

  • Runtime upgrades: PHP, .NET Framework, Java, Node.js
  • Front-end upgrades: AngularJS, jQuery to React
  • Database upgrades and schema clean-up
  • Automated tests before every change

Stack modernization

From legacy to a modern stack, one safe step at a time

Whether you run a decades-old monolith or a microservice platform that grew out of control, we move it to a modern, maintainable stack — without a big-bang rewrite.

Legacy monoliths

  • Strangler pattern: replace one module at a time
  • Modular monolith as a safe intermediate step
  • Extract high-value services first
  • Zero-downtime cutover with parallel runs

Legacy microservices

  • Consolidate service sprawl and dead services
  • Upgrade outdated runtimes and libraries
  • Containers, CI/CD and infrastructure as code
  • Unified logging, tracing and monitoring

01

Audit

A paid full-stack audit maps your code, data and dependencies.

02

Plan

A phased roadmap with a fixed quotation for each phase.

03

Migrate

We modernize in small slices, each one live and tested.

04

Decommission

Old components are retired only once the new ones are proven.

Stack Modernization*

Monolith and microservice legacy projects

starting at25.000 Euro
Request a modernization quotation

Legacy pricing

Legacy Integrations*

Connect a legacy system to AppUnified™ or your existing tools.

starting at1.500 Euro

per Legacy Integration

Request a quotation

Legacy Maintenance & Upgrades*

Specialized maintenance and step-by-step upgrades, quoted on a custom basis.

Custom quote
Request a quotation

Stack Modernization*

Move a legacy monolith or microservice platform to a modern, maintainable stack.

starting at25.000 Euro
Request a quotation

* Every legacy project starts with a paid full-stack audit (starting at 450 Euro), so the quotation is based on what your system really contains. See all prices.

All prices exclude VAT, which will be added at the applicable rate.

Ready to make your stack work harder for you?

Start with a free stack audit. In 48 hours you get a clear report and a fixed quotation — no surprises, no agency markup.