I'm Kai Simon, a qualified tax clerk and software developer. I take care of your day-to-day bookkeeping, make your numbers easy to understand and build software and automations that make office work easier, in German or English.
Programs I built for my own business and for clients. Each of them is in daily use.
Invoicing software with e-invoicing to EN 16931, bank reconciliation and simple cost accounting. Corrections run through cancellation and replacement invoices, nothing is ever deleted.
Office software for a recruitment agency: candidates, clients and placements in one place, with invoicing and data protection built in.
Carefully tested, clearly documented and run on my own servers instead of someone else's cloud.
For freelancers and small businesses who want one fixed point of contact. You hand over the receipts, I take care of the rest. Your tax advisor gets clean data, and you know where your business stands.
Discuss servicesCategorising and posting receipts, reconciling bank and cash, keeping track of open items.
Payslips for your team, social security notifications and wage tax returns.
Organised to German GoBD rules, so nothing gets lost and everything stays easy to find.
Your bookkeeping reaches your tax firm complete and in the format it expects.
I explain your reports in plain language, plan your cash flow with you and work out prices and costs, based directly on your ongoing bookkeeping.
In 20 minutes we clarify what needs doing and what you would like to hand over.
By upload, email or in a folder, whatever is easiest for you.
Your bookkeeping is done and goes to your tax firm in one batch.
n8n is a tool that connects your programs with each other. A workflow starts on its own, for example when an email arrives, and then works through the steps that would otherwise be done by hand. I set up n8n for you and build the workflows, on your own server if you like, so your data stays in-house.
Bookkeeping assistance under the German Tax Advisory Act (StBerG) and business consulting without tax advice. Tax returns, annual financial statements and tax advice are handled by your tax advisor.
Alongside client work I build my own apps. This is where I hone the craft that later goes into every client project.
A cosy cooking game for iPhone and iPad. From the first idea through design and programming to the App Store, built entirely by myself.
Soll is German for debit, one side of every ledger. As a tax clerk I see every day where office work gets stuck: data entered twice, lost receipts, software that ignores how people actually work. So I don't just do the bookkeeping, I also build the tools for it. And because I already know your numbers, I can tell you what they mean. The result is always the same: numbers you can rely on.
Tell me briefly what it is about. I will reply within two working days, and the intro call is free and without obligation.
kontakt@soll-und-code.de