FiatLux Software
enhr

FiatLux Software: custom software for businesses and agencies

How we work

The engineer on your first call writes the code

Web apps, integrations, and automation for businesses, development under your brand for agencies, and fast C++ where performance matters.

How the project runs
Web apps

Web apps built around how you work

Dashboards, client portals, and internal tools with real accounts and data behind them, owned by you instead of rented.

Websites & web apps
Integrations

Stop copying data between tools

We connect your CRM, accounting, shop, and spreadsheets so data moves on its own, and automate the reports nobody wants to make by hand.

Integrations & automation
For agencies

Extra development capacity, under your brand

White-label builds and overflow work. NDA first, no contact with your clients, code to your standards.

How we work with agencies
Systems · C++

C++ for code that has to be fast and stable

Engine logic, data processing, and native modules, from the same studio that builds your web layer.

See the open-source work

What we build

WEB

Websites & web apps

Fast sites and online stores, and the dashboards, client portals, and internal tools behind them, with real accounts, data, and APIs. Built once and owned by you instead of rented across five subscriptions.

INTEGRATIONS

Integrations & automation

Connect the CRM, accounting, shop, and spreadsheets you already use so data moves between them on its own. Python scripts and APIs take over the copy-paste work that eats your team's hours.

SYSTEMS

Systems & performance work

Lower-level C++ that has to stay fast and stable: engine logic, data processing, native modules. The performance-sensitive layer most web shops quietly outsource, done in-house.

AGENCIES

Development for agencies

White-label builds and overflow work for when your own developers are fully booked. NDA before the brief, no contact with your clients, and code written to your standards. How it works

“Programs must be written for people to read, and only incidentally for machines to execute.”

Harold Abelson & Gerald Jay Sussman, Structure and Interpretation of Computer Programs (1985)

How we work

Inside FiatLux

work

Code you can read before you hire us

Open-source C++, our own CRM product, and this site.

projects See the work
for agencies

Development under your brand

NDA first, your repo, your standards.

nda · your repo How it works
process

How the project runs

Free first call, fixed quote, progress you can see.

3 steps The process
studio

Who we are

A software studio in Koprivnica, Croatia, working with clients across the EU and the US.

koprivnica, hr About the studio

The toolkit

FRONTEND UI
  • Astro
  • Next.js / React
  • TypeScript
  • Tailwind CSS
BACKEND API
  • Python / FastAPI
  • REST APIs
  • Auth & sessions
  • Node.js
SYSTEMS CORE
  • C++
  • Performance work
  • Integrations
  • Concurrency
DATA + OPS INFRA
  • PostgreSQL
  • Supabase
  • Git / GitHub
  • Cloudflare · Vercel

How we work

Scope before code

We agree on what's actually being built and why, in plain language, before anything gets written. No vague briefs that balloon later.

Never locked in

The code lives in your repository from day one, documented and built on mainstream tools, so your team or any developer you hire can pick it up and keep it running.

No handoffs

The engineer on your first call is the one who designs and writes your software. Nothing gets lost between a salesperson, a project manager, and a subcontractor.

Honest about fit

If a project isn't a good fit, we'll say so and point you somewhere better. The goal is work worth referring on.

Koprivnica · Croatia · EU

From Croatia, for clients across the EU and the US.

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