What technologies do you use?

We mostly work with Laravel and MySQL on the backend, Vue on the web frontend and React Native for mobile, all built on APIs and Docker containers. When it fits, also Python/FastAPI and real-time with WebSockets. We pick the stack based on what each project needs.

Do you handle Spanish tax and regulatory compliance?

Yes, it's one of our strengths. We have production software covering VeriFactu, SII, corporate income tax (forms 200 and 202), SEPA remittances and legal time tracking. If your project has to comply with the tax office or labor law, we know the terrain.

Can you adapt our software to VeriFactu?

Yes, if it's your own software: we review how it issues and stores invoices and adapt it. We run an invoicing platform in production with VeriFactu, Facturae and SEPA direct debits.

How much does a project cost?

It depends on the need and the scope; we work with standard industry rates. You get a clear estimate before we start, with no surprises.

How long does delivery take?

It depends on the project's complexity. We work in phases with partial deliveries, so you see progress early and always know where the project stands.

Do you work remotely?

Yes, we work fully remotely. We coordinate with your team over video calls and whatever tools you use, wherever you are.

Yes. We sign a non-disclosure agreement whenever you need one.

Kyros | Software development studio in Spain: ERP, CRM, AI

Services

Custom
development.

Custom business software, ERP and CRM, web and mobile apps and AI for companies, with Spanish tax compliance built in. From Tarragona, working remotely across Spain.

01 // SERVICE

AI & automation.

We automate processes and integrate external services and AI, so your product does more with less.

See the service

Integration

API

Data

RAG

02 // SERVICE

Web apps.

Custom SaaS platforms, ERPs and CRMs, including business software with tax and regulatory compliance. Multi-company, real-time and built to last.

See the service

Lighthouse

100/100

TTFB

< 100ms

03 // SERVICE

Deployment & maintenance.

Docker, CI/CD, monitoring and ongoing support. We deploy it and keep it running.

Uptime

99.9%

Deploy

CI/CD

04 // SERVICE

Cybersecurity.

Security audits of web applications, APIs and infrastructure: we find vulnerabilities, prioritise them and help you fix them.

Standard

OWASP

Scope

Web · API

05 // SERVICE

Mobile apps.

iOS and Android apps that share their backend and data with the web, so everything stays in sync.

Platforms

iOS · Android

Performance

60 fps

Projects

Projects
in production.

A sample of the kind of projects we build.

SaaS platform // PROJECT

Zurvyn

Our flagship platform: a modular SaaS where each company turns applications on or off as it needs them and pays only for what it uses. It all runs on a single backend with web and mobile apps, so every feature reaches every device at once and adding a new app is just a matter of switching it on.

LaravelVueReact NativeMulti-tenantMonorepo

Visit zurvyn.com

Our product

Corporate intranet // PROJECT

Portal for a network of advisory firms

The daily hub for an entire network of advisory and professional firms: internal comms, documents, training and management brought together in one portal.

LaravelVueModular monolithMulti-tenant

Education ERP // PROJECT

ERP for a training center

The system that runs a training center end to end: enrollment, academic records, billing and payments, all in one place and in real time. It takes the heaviest part, the finances, off your plate: SEPA remittances, electronic signing and automatic payment reminders, with multi-branch support.

LaravelVueMySQLWebSocketsSEPA

Sales CRM // PROJECT

Multi-company sales CRM

A B2B sales CRM used by several companies at once, built so no lead ever slips through. It captures opportunities from web forms and an AI chatbot that runs 24/7, then routes each one automatically to the right rep by territory and workload, so every lead lands in the right hands instantly.

LaravelVueMySQLRedisMulti-tenant

Invoicing SaaS // PROJECT

Invoicing & accounting platform

The platform that invoices and keeps the books for several companies at once, with sales, purchases, inventory and banking all in one place. It's compliant out of the box with Spanish tax rules (VeriFactu, Facturae and SEPA direct debits) and handles the heavy lifting on its own, generating e-invoices and mass mailings in the background.

FastAPICeleryRedisMySQLVeriFactu

Energy brokerage // PROJECT

CRM for an energy broker

The CRM that runs the whole business of an electricity and gas broker: from the moment a lead comes in to closing the supply sign-up or switch with the retailer and paying the partner their commission. It brings partners, end customers and retailers into a single flow, with automatic commission settlement and real-time notifications.

LaravelPHPMySQLRedisWebSockets

See the projects in detail

About us

How we
work.

We're a small, no-nonsense development studio. We build business software that holds up in production, and we measure what we do.

Custom

Our own code

No templates

Full-stack

Web, mobile & infra

One team

CI/CD

Continuous delivery

Tests on every change

1:1

Direct contact

Talk to the people coding

Meet the studio

VALUE.01

Code that lasts

Documented and code-reviewed. Any team can pick up the work.

VALUE.02

No surprises

Clear estimates, phased delivery and direct communication. You always know where the project stands.

FAQ

Common
questions.

Straight answers to what clients ask us most.

We mostly work with Laravel and MySQL on the backend, Vue on the web frontend and React Native for mobile, all built on APIs and Docker containers. When it fits, also Python/FastAPI and real-time with WebSockets. We pick the stack based on what each project needs.

Contact

Get a
quote.

Tell us what you need and we'll reply with a proposal and an estimate. No strings attached.

We work 100% remotely

We sign an NDA when you need one

Reply within 24-48 business hours

Kyros, a software development studio for businesses

Customdevelopment.