German e-commerce bookkeeper (Amazon OSS): sample data + short task, hiring 2–3

I'm a solo founder (backend engineer, payments/fintech background) building a small tool that checks the Amazon VAT Transactions Report before a seller files their quarterly OSS return: wrong VAT rates, marketplace-collected sales that must be excluded, missing registrations, refund handling. WHO I'M LOOKING FOR Bookkeepers or accounting professionals who prepare OSS filings for German Amazon sellers in their day-to-day work. I'm hiring 2–3 people independently, because I want to see how different practitioners handle the same cases. Please work on your own — no coordination with other freelancers on this job. This is not advisory work and not a filing job. MILESTONE 1 — fixed price $250 per freelancer, about 1 week Common task. I send you one synthetic quarter in Amazon VAT Transactions Report format. You return the per-country OSS totals you would file from it, plus a short method-notes form (which rows you excluded and why, how you treated refunds, transfers, currencies). Your own anonymized samples. Amazon VAT Transactions Reports from at least 1 seller profile, at least one full quarter, anonymized per the attached spec — no real names, addresses, or order IDs ever leave your machine. Plus the per-country totals actually filed for that quarter (final numbers only, not the filing document). A recorded 30-minute screen-share. Not the basics — your judgment calls: what you check, what commonly goes wrong, where you've seen sellers get it wrong. BONUSES $60, paid once to the first to deliver: the import/upload format documentation for the Union-OSS return form from inside the BZSt BOP portal (screenshots or exported spec of the file structure in the form's help). $40 per additional distinct seller profile (up to 2). $40 for a quarter containing a correction. $40 for a period with VCS inactive (blank VAT columns). MILESTONE 2 — late September, about $200, offered to one or two of you You independently prepare the OSS numbers for one sample quarter, I run my tool on the same data, and you write up every discrepancy. HOW WE WORK Everything async except one 20-minute video call before the contract starts. All deliverables follow the attached delivery template so results are comparable. Client confidentiality is fully respected: the anonymization spec is designed so nothing personal or identifying is shared, and this is written into the contract. TO APPLY Please answer these four questions in your proposal. Answers from practice, not definitions, are what I'm looking for. Roughly how many OSS returns did you prepare last quarter, and for what kind of clients? Which Amazon reports do you start from when preparing an OSS return, and what must be true in the seller's account for those reports to be complete? Do you submit through the BZSt BOP portal yourself? Briefly, how does the return get entered there? Have you provided anonymized sample data before? How would you approach anonymizing a transactions report?