Where are administrative assistant jobs actually advertised?

Why so many administrative assistant vacancies never reach Indeed or LinkedIn

If you've been refreshing the big boards and seeing the same handful of adverts reposted, that's not a sign you're missing something. A large share of administrative assistant hiring happens through channels those boards don't touch at all, or only touch after the role has effectively already been filled.

The reason is cost and speed, not secrecy. A permanent hire in this field is often mid-salary, mid-risk, and needed quickly — someone's maternity cover starts in three weeks, or the office has been down a person since a resignation and the phones aren't being answered. Posting on Indeed or Totaljobs, sorting hundreds of applications, and screening them takes time an office manager or practice manager often doesn't have. Going to an agency that already has a shortlist of vetted candidates, or promoting the temp who's already covering the desk, is faster. That's the mechanism behind a lot of the silence you're experiencing: it isn't that your application was bad, it's that the vacancy was never really open to cold applications in the way it looked.

The agencies that specialise in this work

Administrative and clerical recruitment is one of the most agency-heavy corners of the job market. A few names come up repeatedly because they run dedicated admin/clerical/office support desks rather than treating admin as a catch-all category:

• Office Angels (part of Adecco Group) — built specifically around secretarial, PA and admin placements.
• Brook Street — long-standing focus on office support and clerical roles, including public sector contracts.
• Adecco, Hays, Reed, Pertemps and Gi Group — general staffing agencies with dedicated business support or office/admin divisions, usually a separate consultant from the one handling, say, finance or IT roles.
• Randstad — runs both permanent and high-volume temp desks for office support.

What matters practically: registering with an agency isn't the same as applying to a job. You typically register once — CV, a short interview or phone screen, sometimes a typing or Microsoft Office skills test — and then the consultant puts you forward for roles as they land, often before those roles are advertised publicly at all, because the client has asked the agency to fill it quietly. Many of these agencies also run temp and temp-to-perm desks specifically for admin — a booking that starts as three weeks' holiday cover can turn into a permanent offer once the employer sees how you work, without the role ever being advertised as permanent.

A detail worth knowing: registering with multiple agencies for the same live vacancy can cause problems — some employers reject candidates put forward by more than one agency for the same role, treating it as a conflict. If you're registered with several, it's worth asking each consultant directly whether they're working a specific vacancy before assuming more coverage is always better.

Sector-specific channels: where the sector changes the route in

Administrative assistant is one occupation but the hiring channel changes hard depending on the setting.

NHS and healthcare administration — almost everything goes through NHS Jobs (the national portal) or individual Trust career sites, not general job boards. Roles like ward clerk, medical secretary or outpatient administrator are usually AfC (Agenda for Change) banded, typically Band 2–4 for administrative assistant level, and the advert will state the band and often require basic DBS clearance and sometimes evidence of NHS values-based recruitment questions rather than a standard cover letter.

Local government — each council runs its own vacancy portal (e.g. a borough or county council's own "jobs" page) rather than posting everything centrally, though some appear on LGjobs. Roles are often graded (e.g. Scale 3/4) and the application is usually a structured form against person-specification criteria, not a CV.

Civil Service — administrative officer and executive officer roles (the civil service grades that map roughly onto "administrative assistant") go through Civil Service Jobs, with applications built around the Success Profiles framework and behaviour statements, not a conventional CV and cover letter.

Legal administrative support — law firm admin, including legal secretary and legal PA roles, tends to run through legal-specific recruiters (e.g. Chadwick Nott, Law Support, or the legal desks within Reed and Hays) rather than general boards, because firms want candidates who already know case management systems and legal terminology.

Education — school and university admin roles (exams officer, school office manager, faculty administrator) are frequently advertised only on Eteach, jobs.ac.uk, or the individual school/university's own vacancies page, and almost always run to the academic calendar rather than the standard hiring year.

If you're applying broadly across sectors, checking the sector's own portal will surface roles that never make it to Indeed at all.

Internal movement: the vacancy that isn't really a vacancy

A meaningful proportion of administrative assistant hires are internal — the receptionist gets moved up, the temp gets converted, or someone from another department transfers sideways once their old role is restructured. Large employers (NHS Trusts, universities, councils, big professional services firms) run internal-only job boards, and by policy some roles have to be advertised internally for a set period — often a week or two — before external advertising even starts. By the time you see the external advert, the internal shortlisting may already have happened and the posting is partly a formality to satisfy recruitment policy.

This is also why reception and front-of-house roles matter as an entry point even if the title isn't "administrative assistant": being physically present in an office, temping through an agency, or covering reception gives you visibility for the next internal move in a way that applying cold never does.

Timing: when administrative hiring actually moves

Admin hiring has real seasonality, tied to organisational rhythms rather than the general economy:

• January and September are the two clearest peaks — new budgets and new academic/financial years trigger headcount reviews and backfilling of roles left unfilled over the previous quarter.
• Late spring/early summer brings a wave of temp bookings for maternity cover and holiday cover, since a lot of leave is planned around the summer and needs covering.
• Late November through the Christmas period is usually quiet for permanent hiring but can spike for short-term temp cover, since offices still need reception and admin support running over a period when substantive hiring decisions are paused.
• Public sector and education roles move to their own calendars — school admin roles cluster around Easter and summer term-end (for September starts), and NHS/council recruitment often slows in August when hiring managers are on leave and panels can't convene.

If your applications have gone quiet over summer or late December, that's frequently the calendar, not the CV.

What to do next

Register with at least one agency that runs a dedicated admin/business support desk — Office Angels, Brook Street, or the business support division of Reed, Adecco or Hays — and ask directly what live roles they're working, rather than waiting for an emailed match. If you're targeting the NHS, a council, the Civil Service, a law firm or a school, go to that sector's own portal (NHS Jobs, your target council's vacancies page, Civil Service Jobs, a legal recruiter, Eteach or jobs.ac.uk) rather than relying on it turning up on Indeed. And if a temp booking is offered, treat it as a route to a permanent internal move, not just a stopgap. jobmarket.pro searches across these sector portals and agency listings from one profile and reads each advert in full before preparing an application against it, which is useful if you're trying to cover several of these channels at once without doing it manually for each one.