AES Data Encryption Algorithm Implementation

I need a production-ready AES implementation that I can drop into our stack to protect data at rest. The focus is on clean, well-documented source code that supports 128, 192, and 256-bit keys, CBC and GCM modes, plus straightforward hooks for key rotation... (Budget: $3000 - $5000 CAD, Jobs: C Programming, C++ Programming, Cryptography, Java, Local Job, Microservices, Python, Security, Software Development)