Dear employer.
I am working as senior database developer. My role is create ETL processes to load and transform data into datawarehouse, write optimze sql queries, procedure, function in Postgresql or Oracle depend the project. I can write linux script and schedule it by crontab. I can tuning slowly queries by create indexes,partitions or rewrite if need. Can speak that I am an expert in sql development. And I have deep knowledge in Postgresql , I developed sql queries in Posgresql version 9,10,11,12,13. I currently have a postgresql database version 13 in my PC. And I can work well with other dbms as Oracle, Mysql, Mssql (my PC have all of them).
While reading your project description, I think you need some one from your relational algebra, relational calculus develop sql query and procedure. If you interested in, please send your detail of requirements via chat, I want to help. I will create virtual machine and database engine exactly same your environment to develop.
Please send a message to me so I can know your requirements clearly.
Have a great day. Thank you.