I'm not going to recommend anyone. I think plenty have already been recommended. Instead, I'm going to give my on requisites based-on what I want steemit to eventually be (a software platform).
Experience in
- Event sourcing
- Infrastructure as a service
- Command query request separation
- Graph theory and graph databases
- Golang and grpc
- Webassembly
- Serverless architecture design and implementation
- Concurrent (not multithreaded) programming
- Openapi
- Cryptography
- Penetration testing
- Load testing
- TICK stack, monitoring systems, and user analytics
Get someone that knows that, and you'll be set. My $0.02