Custom software & MVP development
Fast, transparent development of web apps and MVPs — from a testable first version to a product that scales.
Independent developer · Budapest, Hungary
Practical software for Hungarian SMBs — powered by AI.
Endox is one developer: Attila Sikora. I build tools that solve real SMB problems — from chasing unpaid invoices to Hungary’s mandatory eNyugta switch.
Currently taking on new projects
About
I’m Attila Sikora — a software developer based near Budapest (Tárnok), building practical, AI-powered tools for Hungarian small and medium businesses.
I’ve been building business software for years, and recently launched three of my own products on the Hungarian market. I don’t sell slide decks — I ship working tools that I built from scratch and run in production myself.
My focus is on AI agents, NAV integrations (eNyugta, e-cash-register, Billingo, Számlázz.hu) and automating the day-to-day of running a business. The goal is always the same: technology should solve a real problem, not just look good in a demo.
If there’s a recurring, time-draining task in your business, or an idea you’d like turned into software — let’s talk.
Services
How I can help — from the first idea to a system running in production.
AI integration & automation
Bringing large language models (Claude, GPT) into real workflows: document processing, summaries, customer replies, decision support.
NAV integrations
Connecting eNyugta, e-cash-register and invoicing APIs (Billingo, Számlázz.hu) with reliable, regulation-aware solutions.
Process automation for SMBs
Replacing repetitive manual work: data sync, reports, notifications. Less spreadsheet juggling, fewer mistakes.
Consulting & technical audit
Stuck on a project or a decision? I review the system and give you a clear, actionable recommendation.
My own products
Not case studies — these are live, working products that I built and operate.
P
Pénzlátó
Cash flow & receivables
A receivables radar and cash-flow tool for invoicing SMBs. It shows who owes you, how much, and when the money lands.
- Billingo integration
- Automatic payment reminders
- Weekly AI summary
e
eNyugta kalauz
Hungarian NAV switch 2026
An interactive guide to the eNyugta / e-cash-register switch that becomes mandatory in Hungary on 1 September 2026.
- Obligation-checker wizard
- Plain-language knowledge base
- Up-to-date deadlines
A
AutoSzűrő
New-car price list
New-car pricing and comparison in one place — filter by brand, category and powertrain.
- Full Hungarian price list
- Side-by-side comparison
- Electric & hybrid filters
Why work with me?
A developer who understands the Hungarian SMB reality — not just the code.
Direct communication
No account managers, no telephone game — you talk to the person who writes the code.
I ship fast
Three live products prove it: the path from idea to a working solution is short.
I know the local terrain
NAV regulation, invoicing APIs, SMB reality — no need to explain it from zero.
AI where it actually helps
No hype: I add AI only when it saves measurable time or money.
Let’s talk about your project
Describe in a few sentences what you need. I reply within 1–2 business days.
Thanks for your message!
I’ll get back to you at the email address you gave shortly.
Or email me directly: info@endox.hu