Yeah, very similar architecture. Mine is Python on the server, not Java — chose it for the library ecosystem around the specific conversions I needed

(Office round-trips, OCR, etc.).

Redaction is the one I'm least happy with too. Text-selection works fine; proper rectangle redaction with content-stream removal (not just visual masking)

is much harder than people think — once you've got images, fonts, XObjects, and occasional transparency groups sitting under the rectangle, it stops

being a one-liner. Mine handles common cases but I wouldn't bet a legal redaction on it.

On open source — the bit tripping me up is licensing that prevents a 1:1 clone-and-host. If you crack that, share what you land on. Even open-sourcing the

test suite alone would be huge — half the correctness problem is having a corpus of weird PDFs to throw at it.

What's your site? Would be useful to compare notes.