Mandatory Skills:
Salesforce
Apex
Sales cloud 
Service Cloud
Marketing cloud
Data Cloud
Salesforce CPQ / Steelbrick CPQ/Appttus CPQ
Health Cloud
Revenue Cloud
Community Cloud 
SOQL/SOSL
Lightning Web Components (LWC)
Salesforce APIs
REST/SOAP integrations
Platform Events
Salesforce Flows
Data Loader
Salesforce Deployment / DevOps

Certifications:
PD I
PDII
sales cloud
service cloud
marketing cloud / email cloud /Marketing Cloud Developer / Marketing Cloud Administrator/Marketing Cloud Email Specialist
Data Cloud
CPQ Specialist
Vlocity
Community Cloud Consultant