Experience in installing, configuring and upgrading MongoDB databases, as well as general administration.

Schema design, performance tuning, query optimization, backup solutions (Physical and Logical) Replica set (elections, read/write concerns, arbiters) etc

Sharding (choosing a good shard key, balancer, moving chunks, zoning shard with pre-split chunks, etc)

Engine selection and usage

Detailed understanding of monitoring requirements

Demonstrable experience of administering Linux based systems

Knowledge about virtualized environments such as VMWare, Docker and/or Kubernetes

Knowledge of public cloud providers (AWS, Google Cloud, Digital Ocean and/or Azure)

Scripting/automation tooling (bash/python and Ansible) experience