From complex ideas to scalable digital products
From architecture to deployment, we design and develop reliable backend infrastructures that power growth, efficiency, and long-term stability.
About us
We don't just write code,
we build foundations.
We specialize in designing and developing custom software tailored to your business goals. From robust web platforms and scalable APIs to advanced AI and video recognition systems, our expertise spans the full technology stack.
We combine strong engineering principles with modern tools to build reliable, high-performance solutions that last.
Our Expertise
We turn complex challenges into elegant, scalable systems.
Increase Revenue
We help you turn technology into measurable profit. Through optimized user experiences, smart automation and scalable software design, your products attract more customers, retain them longer.
Understand Data
Transform raw data into insight and action. We design data pipelines, dashboards and AI models that give you a clear view of performance, customer behavior and operational trends.
Scale Systems
Your growth shouldn't be limited by your infrastructure. We build and optimize cloud architectures that handle increasing demand smoothly, ensuring high performance, reliability and cost efficiency as your business expands.
Futureproof Security
Security is built into everything we deliver. From authentication and encryption to access control and compliance, we design systems that protect data, users and reputation: ready to meet evolving security standards.
Optimize Delivery
Speed and quality go hand in hand. Our development process focuses on automation, CI/CD and agile practices to shorten release cycles, reduce downtime and deliver consistent value without compromising stability.
Expansion & Growth
We help you adapt your digital presence for new audiences and regions. Whether through localization, multi-currency support or tailored user experiences, we make your products ready for global reach.
Latest Projects
Real systems. Real impact.
Voluntarius
We redesigned the backend architecture to support multi-tenant operations and asynchronous event handling. The result: reduced API response time by 42% and enabled seamless scaling to thousands of concurrent users.
Clasora
A comprehensive e-learning platform connecting students with tutors worldwide. We built a scalable real-time matching system, video conferencing integration, and payment processing infrastructure supporting multiple currencies.
Open Events API
We designed and deployed a high-performance event management API serving millions of requests daily. The platform aggregates and normalizes event data from multiple sources with intelligent caching and real-time updates.
Event.io
An intelligent AI-powered chat interface for discovering events. We built a conversational AI system that understands natural language queries and provides personalized event recommendations with real-time availability and smart filtering.
Industries
Specialized solutions for industries we know best.
Tourism & Events
Event management platform and multilingual AI chatbot built for tourism boards, destination marketing organizations, hotels, and travel platforms.
Education
Learning management systems, student platforms, and educational technology solutions that enhance teaching and learning experiences.
FAQ's
Your questions,
Explore our FAQs to learn more about our process, pricing, and how we can bring your vision to life. If there is still some questions you have, you can write us a email on office@c9group.dev
We focus on backend-heavy systems, from SaaS platforms and data infrastructures to complex integrations and custom APIs. If it requires thoughtful architecture, performance optimization, or large-scale deployment, it's in our zone.
Knowledge Hub
Articles & Insights
Tax & Finance SystemsUAE E-Invoicing on 1 July 2027: Getting an In-House ERP Ready for Peppol
What a home-grown or customised ERP has to produce for UAE e-invoicing: PINT-AE fields, credit notes, the five-corner flow, provider integration and a nine-month plan to 1 July 2027.
Tax & Finance SystemsE-Rechnung From 1 January 2027: Issuing Invoices From Your Own Systems
German firms above €800,000 turnover must issue EN 16931 e-invoices from 1 January 2027. What custom billing and ERP systems need to change, and a plan for the last quarter of 2026.
Tax & Finance SystemsVERI*FACTU for Custom Invoicing Software: Spain's 2027 Deadline
Spanish companies must invoice from adapted software before 1 January 2027. What bespoke and in-house systems must build, who signs the declaración responsable, and a plan that fits.
Tax & Finance SystemsFrance E-Invoicing 2027: Connecting Your Own Billing System
From 1 September 2027 French PME issue e-invoices and file e-reporting through an approved platform. What an in-house billing system or custom ERP has to output, and an 11-month plan.
Let's build a system that scales, and keeps working.
Whether you're scaling an existing system or starting from scratch, we'll help you design a product that's stable, fast, and future-proof.
Schedule a MeetingNo obligation. We reply within one business day.