Hierarchical Betting Exchange Software Build

I’m commissioning a full-featured betting exchange that runs on a Super Master → Master → Agent → User hierarchy. Each level must be able to create and manage the tier directly beneath it, with every transaction automatically mirrored in a tight, tamper-proof ledger... (Budget: $5000 - $10000 USD, Jobs: .NET, API Development, Backend Development, C# Programming, Database Development, Microservices, PHP, Software Architecture)