Sofia City, Bulgaria
Custom ERP and billing, AI agents, web applications and SaaS for technology and professional services businesses in Sofia. Built by Flip Retail in Jaipur, India, and delivered remotely, with working software every two weeks.
01 — Local economy
Bulgaria's capital concentrates most of the country's banks, telecom operators and large company head offices, and software development and outsourcing centres for multinational and home-grown firms fill Business Park Sofia and the offices along Tsarigradsko Shose. Its position on the main road and rail routes to Greece, Serbia and Turkey supports a large wholesale and logistics trade.
Also known as София.
Bulgarian and English
02 — Industries
What we would build first for the industries Sofia is known for.
03 — Compliance
What an ERP, billing system or AI agent has to respect here.
| Indirect tax | VAT (ДДС / DDS), standard rate 20%Standard rate 20% with a 9% reduced rate for selected supplies; returns and VAT ledgers are filed monthly. Since the euro changeover on 1 Jan 2026, invoices are issued in EUR (conversion rate BGN 1.95583 = EUR 1). |
|---|---|
| E-invoicing | Voluntary · EN 16931 (B2G acceptance); no B2B mandateThere is no B2B e-invoicing mandate (electronic invoices need the recipient's acceptance), and public contracting authorities must accept EN 16931 e-invoices. A future ViDA-aligned model has been under consultation without binding legislation. |
| Data protection | GDPR plus the Personal Data Protection Act (as amended in 2019)GDPR applies directly, supplemented by the Personal Data Protection Act (as amended in 2019) and supervised by the Commission for Personal Data Protection (CPDP); B2B buyers expect an Art. 28 data processing agreement, a sub-processor list and, in practice, EU/EEA hosting or SCC-covered transfers. |
| AI rules | The EU AI Act applies directly: prohibited AI practices have been banned since 2 Feb 2025, general-purpose AI model rules apply since 2 Aug 2025 and transparency duties (e.g. chatbot disclosure, AI-content labelling) since 2 Aug 2026, while the Digital Omnibus on AI (in force 27 Jul 2026) moved stand-alone high-risk (Annex III) obligations to 2 Dec 2027 and product-embedded high-risk (Annex I) obligations to 2 Aug 2028; Bulgaria had not formally appointed its AI Act authorities as of mid-2026. |
| Systems we migrate from or connect to | Microinvest, Ajur L, Plusminus, Business Navigator, SAP Business One, OdooMasters, ledgers, stock and open balances move across and are reconciled before cutover. |
| Payment rails for web apps and SaaS | ePay.bg, Borica, myPOS, SEPA, Stripe |
| Also worth knowing | Bulgaria joined the euro area on 1 Jan 2026, so ERP data, price lists and reports moved from BGN to EUR. Retail sales require fiscal devices and certified sales-management software connected to the NRA, and SAF-T reporting is being phased in starting with large taxpayers. |
General information, not legal or tax advice. Last reviewed October 2026. Rules change, so we confirm current requirements during discovery; your tax adviser should confirm anything that affects filings.
Sources consulted:
04 — Working together
Jaipur is 3 h 30 min ahead of Sofia on standard time, and 2 h 30 min ahead during daylight saving time there. A 09:00 start there is 12:30 in Jaipur. Standard 09:00–18:00 office days overlap by 5 h 30 min to 6 h 30 min, which is enough for live calls, demos and same-day answers.
Local time, standard time.
Great communication, fluent English, delivered on time, and exceptional work.
50+ projects for 30+ clients in 11 countries over six-plus years.
05 — FAQ
Yes, remotely. Flip Retail is a software studio in Jaipur, India, with no office in Sofia; discovery happens on video calls and you get working software every two weeks.
Jaipur is 3 h 30 min ahead of Sofia on standard time, and 2 h 30 min ahead during daylight saving time there. A 09:00 start there is 12:30 in Jaipur. Standard 09:00–18:00 office days overlap by 5 h 30 min to 6 h 30 min, which is enough for live calls, demos and same-day answers.
Yes. Invoicing is built for Bulgaria's VAT (standard rate 20%). On e-invoicing: There is no B2B e-invoicing mandate (electronic invoices need the recipient's acceptance), and public contracting authorities must accept EN 16931 e-invoices. A future ViDA-aligned model has been under consultation without binding legislation. If you or your customers want it, a custom ERP can connect to EN 16931 through an accredited provider.
You choose: your own cloud account in a region that suits you, or your own servers. Access inside the system is role-based, and during development we work on test or masked data wherever possible. GDPR applies directly, supplemented by the Personal Data Protection Act (as amended in 2019) and supervised by the Commission for Personal Data Protection (CPDP); B2B buyers expect an Art. 28 data processing agreement, a sub-processor list and, in practice, EU/EEA hosting or SCC-covered transfers.
Yes. Masters, ledgers, stock and opening balances move across and are reconciled with your accountant before cutover, ideally at a year-end or quarter-end.
Yes. Current language models handle Bulgarian and English well, including mixed-language messages. We still test an agent in each language your customers use before it goes live, and route anything it is unsure about to your team.
Usually one module that fixes the most expensive problem first. For technology & startups that is often subscription billing and project & time tracking. It goes live early, and the rest of the system follows in two-week increments while your team is already using it.
Contact
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