Company · The mission-critical modernization specialist
Future-proof your mission-critical applications.
For the systems that can't fail, Four Js takes a 30-year-old codebase all the way to AI-ready — run, extend, augment and operate what you already run, preserving the same business logic. No rewrite.
Video transcript — all information appears as on-screen text over music
You've never heard of us, but we are in your lives. 10,000+ satisfied customers. 1,000,000+ users. 20+ market sectors. 5 continents. 20+ languages. Justice and government: 150+ law courts, 650+ city and county halls. Public safety and defense: 100+ police forces, 4 departments of defense. Healthcare: 140+ public hospitals, 4.78 billion prescriptions per year. Finance: 70+ banks, 180+ insurance brokers, trillions of dollars transported, 100,000 debts managed. Logistics and distribution: 33+ international freight forwarders, 1,000+ car dealers. Electronics: 35M PCs per year, 100M smartphone screens per year, 180M smartphone batteries per year. Manufacturing: 800,000 tires per day, 5,000,000 utensils per day, 70M bottles of wine per year. News and media: 3,600,000 newspapers distributed per year, 300+ TV stations. Construction: 30+ construction companies, 500+ construction and agricultural dealerships. You've never heard of us, but we are in your lives. Four Js — www.fourjs.com
Specialists in the applications that can't fail.
Four Js does one thing, and has for more than 30 years: keep mission-critical applications alive and moving forward. Many of those systems are built on Informix 4GL — and Genero BDL is its direct evolution, so recompilation is instant and decades of business logic transfer completely, with no documentation and no rewrite. Our platform, Genero, lets organizations preserve that logic while modernizing everything around it — and now take it all the way to AI-ready, without replacing the systems they already run. From a 30-year-old Informix-4GL codebase to an AI-enabled application, the same business logic carries forward. That focus is captured in three words on our logo: the power of simplicity.
One partner. Every layer of your mission-critical application.
Most vendors solve one problem — a new frontend, a reporting tool, an observability layer — and you end up managing five vendors, five contracts and five integration risks. Four Js covers the entire stack: runtime modernization, frontend decoupling, AI augmentation, production observability and enterprise reporting — all built to work together, all designed for applications that cannot fail. No rewrite. No big-bang migration. No new vendor dependency that puts your existing investment at risk.
- Modernize
- Reimagine
- Accelerate
- Operate
- Report
One platform. Five product families.
Each product solves a distinct need on the same Genero core — adopt what you need, when you need it.
Modernize
Where downtime isn't an option.
Four Js powers high-stakes operations across the industries that can't afford to fail — trusted by leaders in Manufacturing & Logistics (DHL), Banking (Société Générale) and Retail (CVS), and running everything from global enterprises down to regional 911 dispatch systems.
Trusted by
Global scale, genuinely local support.
Nine offices in nine countries, supporting customers across five continents — local support in your region, time zone and language. Wherever your business runs, there's a team keeping your mission-critical applications supported around the clock.
- USA
- Mexico
- United Kingdom
- Ireland
- France
- Germany
- Spain
- Italy
- Australia
A lifelong partner, not just a platform.
Professional Services covers the full lifecycle of your Genero application — planning, development, modernization, database migration, containerization and quality assurance — engaging on your terms, with industry-certified experts and a track record across mission-critical environments. Customer Care combines over 30 years of technical expertise with a dedicated local presence, so you never face a mission-critical challenge alone. We stand behind one promise: protect your business DNA and keep your systems performing reliably, securely and without interruption.
Stability behind mission-critical software.
Four Js is part of the Volaris Group, which is part of Constellation Software.
For systems that must run for decades, that means continuity you can plan around.
FAQ
Frequently asked questions
What does Four Js do?
We keep mission-critical applications alive and evolving — modernizing decades-old codebases all the way to AI-ready, without a rewrite.
Who owns Four Js?
Four Js is part of the Volaris Group, itself part of Constellation Software — long-term owners of vertical-market software.
Where is Four Js based?
Nine offices in nine countries — USA, Mexico, UK, Ireland, France, Germany, Spain, Italy and Australia. Support reaches five continents, 24/7, in your region and time zone.
Will I have to rewrite my application?
No. Genero BDL is the direct evolution of Informix 4GL; recompilation is instant and your business logic carries forward. You modernize UI, devices, databases and cloud at your pace.
What does "all the way to AI-ready" mean?
The same application can gain a modern frontend, AI augmentation over MCP, production observability and high-volume reporting — added as layers, not rewrites.
Is Four Js only for large enterprises?
No. We serve global enterprises and regional systems alike — from DHL, Société Générale and CVS down to regional 911 dispatch.