Delphi specialists · 20+ years
We modernize the Delphi software your business runs on.
Migration, modernization, and new development for VCL and FireMonkey applications, plus the testing, QA, and modern web skills to take them further.
From any era
- Unicode migration
- 64-bit compile
- High-DPI + VCL styles
- Dead components replaced
features lost0
- years of Delphi
- 20+
- years of Delphi
- projects delivered
- 52+
- projects delivered
- job success
- 100%
- job success
About
The Delphi team that's still here.
ONS Systems is a software consultancy built around a rare specialty: Delphi. For over twenty years we've developed, migrated, and maintained the VCL and FireMonkey applications that companies quietly run on: point-of-sale systems, ERPs, and the line-of-business tools that can't afford a bad release.
Around that core we've built full testing and QA capability and a modern web practice covering React, Node.js, .NET, and cloud, so whether your application needs rescuing, extending, or rebuilding, one team can take it the whole way.
What we do
Delphi at the core, modern skills around it.
A focused set of services, led by the Delphi expertise most agencies no longer have.
Flagship
Delphi Development & Modernization
Migration from any Delphi era to 13, VCL and FireMonkey development, and long-term maintenance of business-critical applications.
ExploreTesting & QA
Quality as a service: manual testing, Playwright and Cypress automation, plus API, load, and security testing.
ExploreModern Web & DevOps
React and Next.js front ends, Node.js and .NET APIs, AWS and Azure infrastructure with CI/CD.
ExploreWhy us
Why teams pick us.
A deep Delphi bench
20+ years across Delphi 6 through 13. Whatever era your codebase is from, we've worked in it before.
You talk to the engineers
No account managers in between. Direct communication with the people writing your code, and same-day answers.
AI-accelerated agile delivery
Modern AI tooling speeds up our sprints and testing, with human code review on everything that ships.
Built for the next decade
Scalable, secure, and documented. We modernize software so it stays modern, not so it needs us forever.
Featured work
Migrations that shipped.
A sample of the projects behind our 100% job success rating.
Point of Sale: VCL to FireMonkey
Migrated a complete point-of-sale system from VCL to FireMonkey, taking a Windows-only product to Windows, iOS, and Android from a single codebase.
One codebase, three platforms
Legacy Delphi Modernization
Upgraded multiple production applications from Delphi 6, 7, and 2006 to current releases: Unicode conversion, 64-bit compatibility, and modernized UI with zero feature loss.
Future-proof without a rewrite
Trusted by teams worldwide
AMC Aviation
Mean Technologies
IQ Line
JGRP
SwissSys
HREF
Wocash
Gilson
Stay Alert
Contact
Have a Delphi codebase that needs attention?
Tell us where it stands: the version, the pain points, the plan. We'll reply with an honest read on what it needs. No obligation.