job application
Formal term for the act of applying for a job; often used in official or business contexts.
I started the job application procedure.
Please submit the job application documents.
応募 is a more general term for applying (to a job, contest, etc.), while 求職申し込み specifically refers to a formal job application.
就職活動 refers to the broader job-hunting process, whereas 求職申し込み is the concrete act of submitting an application.
Compound of 求職 (job seeking) and 申し込み (application).