# C9 Group > Software development consultancy building and maintaining backend systems, cloud infrastructure and EU-compliant digital products. Offices in Ljubljana, Slovenia and Novi Sad, Serbia. Founded 2019. C9 Group works on the unglamorous end of software: keeping legacy stacks alive, cutting AWS bills, extending teams with vetted engineers, and getting products through the EU regulatory gauntlet (GDPR, AI Act, Accessibility Act, NIS2, Cyber Resilience Act, Data Act). The site is published in 19 languages under a language path prefix: /en, /de, /fr, /sr, /sl, /it, /mk, /hu, /pl, /es, /zh, /ja, /ar, /no, /is, /fi, /da, /nl, /ko. The URLs below are the English versions; swap the prefix for any other language. Every page is server-rendered, so no JavaScript execution is needed to read the content. Contact: office@c9group.dev · +386 71 809 267 · https://github.com/c9group Offices: C9 Group OÜ, Tartu mnt 67/1-13b, Tallinn, Estonia · Neubergerjeva 15, Ljubljana, Slovenia · Jaše Ignjatovića 7, Novi Sad, Serbia ## Services - [Website and MVP Development](https://c9group.dev/en/build): Fixed-price web and product builds. A business website live in five working days from €490, or an MVP launched in seven days from €1,490. Price agreed in writing against a defined scope before the build starts; the client owns the repository and deploys to their own cloud account. Booked as a 30-minute call on the page. - [Baidu Search Submission](https://c9group.dev/en/baidu-submission): We get one domain submitted to Baidu and report what actually gets indexed. Domain ownership check, sitemap and URL submission, written report. Fixed €490, ordered and paid for on the page. - [Website Accessibility Compliance Check](https://c9group.dev/en/accessibility-check): Answers whether a website is legally required to be accessible under the European Accessibility Act, which has applied since 28 June 2025, and which standard binds it today (EN 301 549 V3.2.1, so WCAG 2.1 Level AA). Covers who is in scope, the microenterprise exemption, enforcement and the six failure types behind 96% of detected errors. Free scoped review of a representative set of pages, findings mapped to the WCAG success criterion each one breaks, then code-level remediation at a fixed price. No overlay widgets. - [AWS Cost Optimization](https://c9group.dev/en/services/service-offering-aws-cost-optimization): Reduce AWS cloud costs by up to 60% without compromising performance. - [EU Market Entry Development](https://c9group.dev/en/services/service-offering-eu-market-entry-development): We help international companies build GDPR-compliant, EU-ready digital products. - [Staff Augmentation & Outsourcing](https://c9group.dev/en/services/service-offering-staff-augmentation-outsourcing): Scale your development team with pre-vetted engineers. - [Legacy System Code Maintenance](https://c9group.dev/en/services/service-offering-legacy-system-code-maintenance): Keep your legacy systems running smoothly while planning modernization. - [Web Accessibility Remediation](https://c9group.dev/en/services/service-offering-web-accessibility-remediation): Professional WAVE accessibility evaluation and WCAG 2.2 remediation for web applications. - [All services](https://c9group.dev/en/services): Index of every service offering. ## Articles - [OpenAI Opened ChatGPT Ads to Everyone. Here Is the Whole Setup, Screen by Screen.](https://c9group.dev/en/articles/openai-ads-manager-chatgpt-ads-setup-guide): Advertising. Published 2026-09-02. - [SynthID-Text Is Live in Gemini and Claude. There Is Still No Detection API.](https://c9group.dev/en/articles/synthid-text-watermarking-detection-guide): AI Compliance. Published 2026-08-23. - [EU Digital Compliance in 2026: The Rules That Now Reach Into Your Codebase](https://c9group.dev/en/articles/eu-digital-compliance-2026-website-requirements): EU Compliance. Published 2026-08-06. - [Green Claims and Product Data: What EU E-Commerce Must Show From September 2026](https://c9group.dev/en/articles/eu-green-claims-product-compliance-ecommerce): E-Commerce. Published 2026-08-04. - [EU AI Act Transparency Rules Are Live: What Changes on Your Website](https://c9group.dev/en/articles/eu-ai-act-transparency-obligations): AI Compliance. Published 2026-08-03. - [Wero at Lidl: European Bank-to-Bank Payments Reach the Checkout](https://c9group.dev/en/articles/wero-payment-integration-guide): Payments. Published 2026-07-30. - [The Cyber Resilience Act: 11 September 2026 Is a Real Deadline](https://c9group.dev/en/articles/cyber-resilience-act-software-compliance): Cybersecurity. Published 2026-07-27. - [The EU Digital Identity Wallet Lands in December 2026: How to Prepare](https://c9group.dev/en/articles/eu-digital-identity-wallet-integration): Digital Identity. Published 2026-07-20. - [Cookie Consent Is Being Rewritten: What the Digital Omnibus Changes](https://c9group.dev/en/articles/cookie-consent-eu-digital-omnibus): Data Protection. Published 2026-07-13. - [The EU Data Act: Data Access by Design and the End of Cloud Lock-In](https://c9group.dev/en/articles/eu-data-act-compliance-guide): Data & Cloud. Published 2026-07-09. - [Instant Payments and Verification of Payee: What Changed in European Checkout](https://c9group.dev/en/articles/sepa-instant-payments-verification-of-payee): Payments. Published 2026-06-29. - [The European Accessibility Act Has Teeth Now: What Your Website Needs](https://c9group.dev/en/articles/european-accessibility-act-website-compliance): Accessibility. Published 2026-06-22. - [NIS2 in Practice: Registration, 24 Hour Reporting and Supply Chain Reality](https://c9group.dev/en/articles/nis2-directive-compliance-guide): Cybersecurity. Published 2026-06-15. - [GDPR Compliance for Websites: What It Actually Takes to Build One](https://c9group.dev/en/articles/gdpr-compliance-guide-for-websites): Data Protection. Published 2026-06-11. - [How to Submit Your Website to Baidu Search Engine](https://c9group.dev/en/articles/baidu-search-engine-website-submission-guide): China Market. Published 2026-02-14. - [Baidu Webmaster Tools in English: A Guide to the Console](https://c9group.dev/en/articles/baidu-webmaster-tools-english-guide): China Market. Published 2026-08-26. - [Baidu Site Verification: The HTML File, Meta Tag and CNAME Methods](https://c9group.dev/en/articles/baidu-site-verification-methods): China Market. Published 2026-08-26. - [How Long Baidu Indexing Takes, and What Actually Speeds It Up](https://c9group.dev/en/articles/baidu-indexing-how-long-and-how-to-speed-it-up): China Market. Published 2026-08-26. - [Baidu Search Resource Platform vs Google Search Console: A Working Comparison](https://c9group.dev/en/articles/baidu-search-resource-platform-vs-google-search-console): China Market. Published 2026-08-26. - [Balkan AI Subsidy Program: Free AI Tools for Young Entrepreneurs](https://c9group.dev/en/articles/balkan-ai-subsidy-program): AI Innovation. Published 2026-02-07. - [Open Source Marketing Automation at Scale: Privacy & Full Control](https://c9group.dev/en/articles/open-source-marketing-automation-mautic-setup-guide): Marketing Automation. Published 2026-02-07. - [AI-Driven Software Fluidity: The Future of Adaptive Applications](https://c9group.dev/en/articles/ai-driven-software-fluidity): AI & Software. Published 2025-12-20. - [Open Source Analytics at Scale: Privacy & Customization](https://c9group.dev/en/articles/open-source-analytics-at-scale-privacy-customization-what-is-matomo-analytics-dashboard-how-does-it-work-and-how-to-set-it-up): Analytics. Published 2024-01-15. - [All articles](https://c9group.dev/en/articles): Full article index with category filters. ## Company - [Home](https://c9group.dev/en): Overview, expertise, portfolio and FAQ. - [Careers](https://c9group.dev/en/careers): Open positions. - [Kristijan Sekereš](https://c9group.dev/en/authors/kristijan-sekeres): Author profile. - [Miloš Duraković](https://c9group.dev/en/authors/milos-durakovic): Author profile. - [Iva Seleš](https://c9group.dev/en/authors/iva-seles): Author profile. - [Book a meeting](https://c9group.dev/en/meet): Scheduling page for a consultation. - [Balkan AI Subsidy Program](https://c9group.dev/en/balkan-ai): C9-funded program giving young Balkan entrepreneurs free access to paid AI development tools. - [Free MVP program](https://c9group.dev/en/free-mvp): For solo developers turning prototypes into production systems. - [Tourism solutions](https://c9group.dev/en/tourism-solutions): Industry-specific offering for tourism and events. - [Privacy policy](https://c9group.dev/en/privacy-policy): Data protection and cookie practices. - [Terms of service](https://c9group.dev/en/terms-of-service): Contract terms for engagements, payment and liability. ## Optional - [Sitemap](https://c9group.dev/sitemap.xml): All 1368 URLs across all 19 languages.