Job ads: se busca, se buscan
Ads use the passive se, agreeing with what is wanted: se busca for one, se buscan for several, usually with no article. If the right person may not exist yet, the verb after que is subjunctive.
El sueldo or el salario?
El sueldo is the everyday word for your pay; el salario is more formal: contracts, the news, el salario mínimo (the minimum wage). Many Spanish salaries come in fourteen payments: twelve months plus two pagas extra, one of them at Christmas.
Time at work
La jornada is the working day; media jornada is part-time. Many offices move to a jornada intensiva in summer, a continuous day that ends in the early afternoon. El descanso is a break to rest (also half-time in football); la pausa is a pause in anything, even in speech: hacer una pausa.
Las prácticas and la baja
Las prácticas, in the plural, are an internship. Estar de baja is to be off work on leave, usually sick leave: the doctor te da la baja, and la baja por maternidad is maternity leave.
People
El trabajador is anyone who works (el obrero is a manual worker). La guía is a woman guide or a guidebook, and la azafata is also a hostess at trade fairs.