Please advise me any error on the following paragraph

Question

This is a part of my job exprience, please advise me if there are any errors?

To supervise the supporting staff including sales clerk, on-site customer service co-coordinator, receptionists, drivers and office assistant.

Liaised with contractor and property agents for leasing and maintenance negotiation.

Providing office service support for general maintenance of apartment, furniture and fixtures.

Developed and implemented in house training program for employees for the improvement on work force effectiveness.

Negotiated cost effective shipping arrangements with transport companies, scheduling and production with an overseas manufacturer, making import arrangements, systems management, establishing guidelines for service and increasing overall efficiency.

Thank you very much!

Mister Micawber · Accepted Answer

Be sure that the grammar of each item is in parallel with the others:

Supervised supporting staff, including sales clerks, on-site customer service coordinators, receptionists, drivers and office assistants.
Liaised with contractors and property agents for leasing and maintenance negotiations.
Provided office service support for general maintenance of apartments, furniture and fixtures.
Developed and implemented in-house training program for employees for the improvement of work force effectiveness.
Negotiated cost-effective shipping arrangements with transport companies, and scheduling and production with an overseas manufacturer; made import arrangements, managed systems, and established guidelines for service and increasing overall efficiency.

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