Custom software
your enterprise actually needs
Stop forcing your team to fit a generic system. We build software that adapts to how your company really works — ISO 9001 certified, source code yours.
Free, with a senior consultant. The plan is yours even if you don't hire us.
Production systems built by FSG
0
years operating our oldest production system
+0
daily active users in systems we built
+0
enterprise systems in production across industries
ISO 9001:2015 — pay per validated stage
Why Four Sides Group
See our ISO 9001 methodologyISO 9001:2015 certified process
Pay only after validating each stage.
Source code 100% yours
No recurring licenses, no vendor lock-in.
Enterprise architecture from day one
Public/private environments and server management included.
+14 years of continuous production
Our oldest system has run without interruption since December 2011.
The complaint about custom software is rarely the build. It is everything after it.
A fixed assigned team
The people who built the system keep supporting it.
Support by discipline
Support, analysis, design and implementation, not a help desk.
Written service commitments
Contact in minutes and response in hours, not days.
Continuous adaptation
The system changes when the business changes.
Services for every stage of your system
See all
Enterprise software built around your real processes — not the other way around.
The team that built your system keeps it running, with contractual response times and monthly updates.
We connect ERPs, CRMs, custom apps and third-party APIs that didn't talk before.
Remove manual, repetitive, error-prone work with workflows and business rules.
Practical AI in your processes: LLMs, OCR, classification and prediction on your data.
Enterprise interfaces that operators actually want to use.
We recover stuck or abandoned projects with an honest assessment and a clear plan.
Modernize incrementally — zero-downtime cutover, no big-bang risk.
Real systems in production — not demos
See real case studies
Some of the organizations running on our systems
Experience in your industry
See allIntegrations
Connected to the systems you already use
What our clients
say
How we work: 3 steps
- Discovery We understand your real operation, the problem and what solving it is worth.
- Architecture We design the solution and a delivery plan in validated stages.
- Phased delivery First functional module in 6-10 weeks; you pay as you validate.
Why ISO 9001 matters for software development
A certified process means documented deliverables, validation at every stage and a written warranty: if something doesn't meet what was agreed, we fix it at no cost.
See our ISO 9001 methodology