Migrate Informix to a Web App | Legacy Rescue
To migrate an IBM Informix application to the web, you move the data into a modern database and rebuild the application as a browser-based system rather than machine-translating old 4GL or client-server code. At P-Soft (Barsavosh Fanavaran) we audit your existing Informix Dynamic Server (IDS) or Informix SE schema and Informix-4GL business rules, migrate the data cleanly into a modern database, and rebuild the software as a responsive web app that your team opens in any browser. The result keeps the logic your business depends on while removing the licensing cost and skills shortage that make Informix a risk today. This is a specialist service within our legacy software rescue practice.
Why Informix is a liability now
Informix once powered reliable transactional systems, but for most organizations it has become an expensive, fragile dependency. The platform is niche, the talent pool is shrinking, and the surrounding application code is often decades old.
- High licensing cost: per-core and per-user Informix licensing keeps rising for a database that only runs one aging application.
- Scarce skills: experienced Informix DBAs and Informix-4GL developers are hard to hire and increasingly expensive to retain.
- Data lock-in: business-critical data sits inside a proprietary engine with limited modern tooling, reporting, and integration options.
- Character and client-server front ends: terminal-style or thick-client interfaces cannot be used from a browser, phone, or home office.
Our migration approach
We do not run an automatic converter over your 4GL code. Machine translation of legacy logic produces unreadable, unmaintainable software that nobody can extend later. Instead we rebuild the business logic deliberately on a modern stack while preserving exactly how your processes work.
- Understand the rules: we document what your Informix-4GL programs and stored procedures actually do, including edge cases your staff rely on daily.
- Migrate the data: we map the IDS or Informix SE schema to a modern relational database and move every record with validation and reconciliation.
- Rebuild, not wrap: the new application is a clean web codebase, so it stays maintainable and open to future change. If you also need new capabilities, our custom software development team builds them in.
What you get
The outcome is a modern application that works the way a web product should, without the legacy constraints.
- Web and mobile access: staff work from any browser on desktop, laptop, tablet, or phone.
- 50+ concurrent users: the architecture supports many simultaneous users without the limits of old client-server setups.
- Role-based access: granular permissions so each user sees only what their role allows.
- Automated backups: scheduled, verifiable backups replace fragile manual routines.
If you are weighing a browser-based rebuild against keeping an installed client, our guide on web vs installed software explains the trade-offs. Informix often sits behind inventory or finance systems, so our inventory software experience applies directly to data-heavy rebuilds.
How the project runs
We deliver remotely with English-language support throughout. A typical engagement moves through four stages.
- Audit: we review the Informix schema, 4GL programs, and current workflows, then agree scope.
- Rebuild: we build the web application and validate each screen and rule against the old system.
- Data migration: we move your data, reconcile totals, and run parallel checks before cutover.
- Training: we train your users and hand over documentation so your team stays in control.
Frequently Asked Questions
Will my Informix business logic be preserved?
Yes. We document every rule in your Informix-4GL code and stored procedures and rebuild them faithfully, so the new web app behaves the way your staff expect.
Do I have to keep paying Informix licenses after migration?
No. Once your data is migrated and the web application is live, you can retire the Informix engine and its licensing entirely.
Can you migrate the data without losing anything?
We map the full schema, move every record, and reconcile counts and totals between the old and new systems before go-live, so nothing is lost.
Do you work with companies outside your home country?
Yes. We deliver the whole project remotely with English support. We make no false claims about local offices or certifications; our work speaks through the delivered application.
