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.
Our trusted customers:
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
EU Digital Compliance in 2026: The Rules That Now Reach Into Your Codebase
AI Act, Accessibility Act, Data Act, NIS2, Cyber Resilience Act and more. A practical map of every EU regulation now touching your website, with the real deadlines.
Green Claims and Product Data: What EU E-Commerce Must Show From September 2026
Generic green claims are banned, harmonised guarantee notices become mandatory, and GPSR listing data is still missing from most catalogues.
EU AI Act Transparency Rules Are Live: What Changes on Your Website
Article 50 applies from 2 August 2026. Chatbot disclosure, machine-readable marking of AI content, and the revised high-risk deadlines.
Wero at Lidl: European Bank-to-Bank Payments Reach the Checkout
What the European Payments Initiative wallet is, how merchant integration works through your PSP, and what building it actually costs.
The Cyber Resilience Act: 11 September 2026 Is a Real Deadline
Reporting starts with a 24 hour clock. Scope, SBOM pipelines, vulnerability monitoring, incident runbooks and full application in December 2027.
The EU Digital Identity Wallet Lands in December 2026: How to Prepare
Relying party registration, credential standards, age verification and KYC use cases, and what is worth building before the deadline.
Cookie Consent Is Being Rewritten: What the Digital Omnibus Changes
Articles 88a and 88b would move cookie rules into GDPR. What is proposed, what regulators enforce today, and what to change now.
The EU Data Act: Data Access by Design and the End of Cloud Lock-In
From 12 September 2026 connected products must be designed for data access by default, and cloud switching charges end in January 2027.
Instant Payments and Verification of Payee: What Changed in European Checkout
Instant euro transfers and free Verification of Payee. What it means for checkout, payouts, reconciliation and the payee name on your invoices.
The European Accessibility Act Has Teeth Now: What Your Website Needs
Scope, EN 301 549 and WCAG 2.1 AA requirements, accessibility statements, national penalties, and a realistic remediation plan.
NIS2 in Practice: Registration, 24 Hour Reporting and Supply Chain Reality
Who is in scope, registration duties, the 24 hour early warning, the ten required measures, and what customers now ask suppliers to prove.
GDPR Compliance for Websites: What It Actually Takes to Build One
What GDPR requires from a website, expressed as things you build: data inventory, lawful bases, consent records, subject access requests and retention jobs.
How to Submit Your Website to Baidu Search Engine
Complete guide to getting indexed on Baidu — account requirements, site verification, and SEO tips for the Chinese market.
AI InnovationBalkan AI Subsidy Program: Free AI Tools for Young Entrepreneurs
C9 Group fully subsidizes premium AI development tools for young entrepreneurs across the Balkan region. GitHub Copilot, ChatGPT Pro, Claude, Cursor and more — at zero cost.
Marketing AutomationOpen Source Marketing Automation at Scale: Privacy & Full Control
What is Mautic, how does it work, and how to set it up? The complete guide to self-hosted marketing automation with full data ownership.
AI & SoftwareAI-Driven Software Fluidity: The Future of Adaptive Applications
Explore how AI is revolutionizing software development by enabling adaptive, self-optimizing applications that evolve with user needs and technological advancements.
AnalyticsOpen Source Analytics at Scale: Privacy & Customization
What is Matomo analytics dashboard, how does it work, and how to set it up? Learn about privacy-first analytics with full data ownership.
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 Meeting