Contact person: Swift JSON-to-FIN Blockchain

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Location: Puteaux, France

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I need a Swift-based solution that automatically pulls a series of JSON files from my Dropbox account (using the official SDK or API), converts each file into the FIN format I specify, and then anchors the final output on a blockchain for immutability and auditability.

Here’s the flow I’m after:
• The app authenticates against Dropbox and fetches every new JSON file in a given folder.
• Each file is parsed and transformed into my required FIN layout (I’m not asking for CAMT.053 or MT940—this is a custom FIN specification).
• While transforming, the code must perform full data validation and error checking, rejecting or flagging anything that doesn’t meet the FIN schema before it reaches the blockchain layer.
• Once a file passes validation, its contents—or a hash, if you prefer—are committed to a blockchain network via a Swift module. I’m open to the underlying chain (Ethereum, Solana, private Hyperledger, etc.) so long as the transaction receipt can be queried later to prove the file hasn’t been altered.

Deliverables
1. Well-structured Swift source code (Dropbox fetch, JSON parser, FIN formatter, validator, and blockchain writer).
2. A concise README that walks me through setup: Dropbox keys, FIN spec mapping, and blockchain configuration.
3. A small test suite that shows a valid JSON file moving end-to-end, plus one negative test that fails validation.

Acceptance criteria
• All dependencies install via Swift Package Manager.
• Running the included tests produces one confirmed on-chain transaction and one validation failure.
• FIN output matches the schema I provide and passes your built-in checks.

If anything in the flow isn’t clear, let me know—I’m keen to move quickly once you confirm feasibility." (client-provided description)