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    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.

    See our work
    • Reply within one business day
    • No-obligation first read
    • Talk directly to engineers

    • 20+years of Delphi

    • 52+projects delivered

    • 100%job success

    Trusted by teams worldwide

    • AMC Aviation
    • Mean Technologies
    • IQ Line
    • JGRP
    • SwissSys
    • HREF
    • Wocash
    • Gilson
    • Stay Alert

    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.

    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.

    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.

    Case 01

    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.

    Delphi FMXVCL MigrationCross-Platform

    One codebase, three platforms

    Case 02

    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.

    Delphi 6→13Unicode64-bit

    Future-proof without a rewrite

    What clients say

    Exceptional Delphi developer with deep expertise. Delivered high-quality work on time and exceeded expectations.
    Client feedback · Delphi application development
    Outstanding work on our migration project. Professional, communicative, and technically excellent. Completed seamlessly with minimal downtime.
    Client feedback · System migration
    Deep understanding of Delphi and related technologies. Delivered exactly what was promised and more.
    Client feedback · REST API development
    See the full work history

    FAQ

    Questions teams ask before reaching out.

    Something else on your mind?

    Ask an engineer directly.

    contact@onssystems.co.in
    Our application is on Delphi 7, or older. Is it too late?
    No. We work across Delphi 6 through 13, including the versions most shops no longer support. Older codebases are a large part of what we do.
    Do we have to rewrite it from scratch?
    Usually not. We migrate in stages, compiler era by era, and keep the application releasable at every step, so your business logic and your users' habits survive.
    The original developers are gone. Can you still take it on?
    Yes. We start by compiling it, reading it, and documenting it, then take ownership of it. Codebases nobody fully understands any more are familiar territory.
    How will we know how the work is going?
    Weekly demos of working software, and you talk directly to the engineers writing your code. No account managers in between.
    What happens after I send a message?
    An engineer replies within one business day with an honest first read. If it's a fit, we review the codebase and give you a scoped estimate. There's no obligation at any point.
    Do you only work with Delphi?
    Delphi is our core, but we also offer testing and QA for web applications and APIs, plus React, Node.js, .NET, and cloud work when a project needs a modern stack alongside it.

    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.

    What happens next

    1. 1

      Tell us where things stand

      The Delphi version, what hurts, and what you'd like it to do next. A few lines is plenty.

    2. 2

      Get an honest read

      An engineer replies within one business day with what it likely needs, and what it doesn't.

    3. 3

      Decide with real numbers

      If it's a fit, we review the codebase and give you a scoped estimate before any work starts.

    Prefer email? contact@onssystems.co.in

    Start a conversation

    Three fields, about a minute. No obligation.