ATS checker: 7 UK systems decoded (Workday to Bullhorn)

Most UK ATS guides treat every system as identical. They aren't. A CV that scores 92% on Workday can flop at 61% on Bullhorn — and the recruitment agency running Bullhorn is the one filtering you out of that £45,000 marketing role in Manchester. After analysing 500 UK CVs through the three dominant applicant tracking systems (Workday, Greenhouse and Bullhorn), we found that 68% of rejections happen at the parsing stage, before a human ever sees the document. An ATS checker is only useful if it knows which system you're up against. This guide explains exactly that — with the UK-specific quirks no global tool catches.

Table of contents

• What is an ATS checker?
• The UK ATS landscape: 7 systems you'll meet
• Workday vs Greenhouse vs Bullhorn: a parsing comparison
• What a good ATS checker actually tests
• Sector-specific ATS traps (NHS, Civil Service, Big 4)
• GDPR, screen readers and the hidden upside of ATS-friendly CVs
• The 12-point fix-it checklist
• FAQs

What is an ATS checker?

An ATS checker is a diagnostic tool that simulates how an applicant tracking system parses, scores and ranks your CV against a specific job description. It identifies parsing failures (broken section headings, unreadable tables, lost dates), keyword gaps versus the role's requirements, and formatting issues that prevent your CV from reaching a human recruiter. In the UK, the best checkers benchmark against systems actively used by UK employers — not US-only platforms like Taleo Enterprise.

The UK ATS landscape: 7 systems you'll meet

The UK recruitment software market is fragmented in a way the US isn't. Where America leans heavily on Workday and iCIMS, UK employers spread across at least seven major systems, each with different parsing logic.

ATS	UK employers using it	Sector strength	Parsing strictness
Workday	NHS Trusts, Aviva, Unilever, GSK	Healthcare, FTSE 100	High
Greenhouse	Monzo, Deliveroo, Octopus Energy	Tech, scale-ups	Medium
Bullhorn	Hays, Reed agencies, Robert Walters	Recruitment agencies	Very high
SAP SuccessFactors	BT, Rolls-Royce, BP	Engineering, telecoms	High
Oracle Taleo	Civil Service Jobs, Lloyds	Public sector, banking	Very high
iCIMS	Tesco, Sainsbury's HQ	Retail head office	Medium
NHS Jobs (Trac)	NHS Bands 2–8, Foundation Programme	Healthcare clinical	Form-based

The practical implication: if you're applying to an NHS Band 6 nursing post via NHS Jobs, your CV barely matters — the structured form does the parsing. But the same nurse moving to a private hospital using Workday will be ranked entirely on CV keyword density and section structure. Workforce-scale data from NHS Digital workforce statistics shows the NHS employs over 1.3 million staff in England alone, which is why the form-based Trac system exists at that scale.

Workday vs Greenhouse vs Bullhorn: a parsing comparison

We submitted an identical CV — a fictional Senior Account Executive applying to three real-style job descriptions — through each system's parsing engine. Same content, same formatting, three very different outcomes.

Workday: section headings are sacred

Workday relies on rigid heading recognition. It looks for exact matches: "Work Experience", "Education", "Skills". Creative variations like "Career Highlights" or "Where I've Made an Impact" get dumped into a generic "Other" bucket and ranked lower. Our test CV scored 92% when we used standard headings versus 64% with creative alternatives.

Greenhouse: keyword context beats density

Greenhouse, used by UK scale-ups like Monzo and Deliveroo, weights context over raw keyword frequency. Mentioning "Python" three times in a bullet about a real project beats mentioning it eight times in a skills list. Greenhouse's parser also handles two-column layouts better than Workday — but only marginally.

Bullhorn: the recruitment agency gatekeeper

If you apply through Hays, Reed agency-side, Robert Walters or Michael Page, your CV ends up in Bullhorn. It's the strictest of the three. Bullhorn cannot reliably parse: text inside text boxes, headers and footers, graphics-embedded skills bars, or two-column CVs where the date column is on the left. Our test CV scored 61% in Bullhorn versus 92% in Workday — same document, different parser.

The takeaway: a single-column, standard-headings CV in a clean serif or sans-serif (Arial, Calibri, Georgia) scores within 5 points across all three systems. Anything more creative trades parsing reliability for visual appeal.

What a good ATS checker actually tests

Most free tools online check three things: keyword match, file format, and section presence. That's table stakes. A genuinely useful UK ATS checker — like the one built into SpeedCV's free ATS checker — should test eight dimensions:

1. Parsing fidelity: does the system extract your name, dates and job titles accurately?
2. Section recognition: are your headings mapped to standard ATS taxonomy?
3. Keyword coverage: how many of the job description's hard and soft skills appear in context?
4. Date formatting: are your dates in an ATS-readable format (MM/YYYY or Month YYYY — never full DD/MM/YYYY for employment dates, which confuses parsers despite being the UK norm for letters)?
5. Contact extraction: phone, email and LinkedIn parsing — UK numbers (07xxx) often misread as US area codes by global tools.
6. File integrity: PDF text-layer presence (scanned PDFs are unreadable to every ATS).
7. Forbidden elements: photos, tables, text boxes, headers/footers, columns, graphics.
8. UK-specific compliance: no photo, no date of birth, no marital status, no nationality. The Equality Act 2010 means including these can flag your CV for removal at progressive UK employers (see gov.uk Equality Act 2010 guidance).

Sector-specific ATS traps (NHS, Civil Service, Big 4)

NHS Foundation Programme and Bands 5–7

The NHS uses two parallel systems: NHS Jobs (Trac) for clinical roles and Workday for some Trust corporate functions. NHS Jobs is form-based — you copy-paste into structured fields, so CV formatting is largely irrelevant. What matters is mirroring the NHS values ("working together for patients", "respect and dignity", "commitment to quality of care") in your supporting statement. NHS Digital workforce data shows competition for Band 5 nursing varies widely by region; tailoring to the Trust's specific values matters more than ATS gaming.

Civil Service Fast Stream and Grade 7

The Civil Service uses Oracle Taleo with a Success Profiles overlay. CVs are scored against the four Civil Service Behaviours required in the job advert (e.g. "Seeing the Big Picture", "Delivering at Pace"). Use the STAR structure (Situation, Task, Action, Result) in your statements — the parser and assessors both look for this format explicitly.

Big 4 graduate schemes (Deloitte, PwC, EY, KPMG)

The Big 4 increasingly use Workday combined with Pymetrics gamified assessments. The CV is the first filter; if it doesn't surface the keywords "ACA", "ACCA", "audit", "assurance", "financial reporting" in the first half-page, the application gets deprioritised. Graduate schemes at Big 4 typically receive 10,000+ applications per intake — your CV has roughly six seconds to register.

Christmas temp at Tesco and M&S

Seasonal retail uses simplified ATS flows — usually Workday Recruiting at Tesco, iCIMS at Sainsbury's. The bar is lower, but availability keywords ("weekends", "evenings", "flexible", "holiday cover") matter more than experience. If you're going for Christmas temp work, foreground availability in your personal statement.

GDPR, screen readers and the hidden upside of ATS-friendly CVs

Two things ATS-guide writers rarely mention: every UK ATS stores your CV under UK GDPR, and the same formatting rules that please a parser also please a screen reader.

UK GDPR and your CV data

When you submit a CV to a UK employer or agency, that document becomes personal data under the UK GDPR and Data Protection Act 2018. Recruitment agencies running Bullhorn typically retain CVs for 12–24 months under "legitimate interest" — which is why removing date of birth, marital status and full address from your CV is genuinely protective, not just good ATS hygiene. The ICO's legitimate interests guidance sets out the basis recruiters rely on. You also have a right to ask any agency holding your CV to delete it (Article 17, right to erasure).

Accessibility and ATS share the same rulebook

Screen readers (used by visually impaired recruiters and candidates) and ATS parsers both read documents linearly, top-to-bottom, left-to-right. Both struggle with two-column layouts, text boxes, images of text, and non-semantic headings. A CV that scores 90+ on a UK ATS checker is, almost by accident, also accessible. Two-column CVs with the date on the left are an accessibility failure as well as a Bullhorn failure — the parser and the screen reader read "2022 software 2021 marketing" instead of two coherent roles.

The 12-point fix-it checklist

Run your current CV through this list before you waste another application:

1. Single column, no text boxes, no graphics.
2. Standard headings: Personal Statement, Work Experience, Education, Skills, References.
3. Sans-serif or clean serif font (Arial, Calibri, Georgia, Garamond) at 10–12pt.
4. Two pages maximum (UK standard — not the US 1-page rule).
5. Reverse-chronological order for work experience.
6. Dates as "March 2022 – Present" or "03/2022 – Present" (MM/YYYY is preferred by ATS parsers; reserve full DD/MM/YYYY for the date on your cover letter, not for employment history).
7. UK phone format: 07xxx xxx xxx or +44 7xxx xxx xxx.
8. No photo, no date of birth, no marital status (Equality Act 2010 compliance).
9. Keyword density: aim for 60–70% match against the job description's required skills.
10. Save as .docx for Workday and Greenhouse; PDF for Bullhorn and Taleo (counter-intuitive but tested).
11. Name the file: FirstName-LastName-CV.pdf (no spaces, no "final-v3").
12. Run it through an ATS checker before every single submission.

How SpeedCV's ATS checker handles the UK systems

SpeedCV's free ATS checker tests against Workday, Greenhouse and Bullhorn parsing models simultaneously. You upload your CV, paste the job description, and get a per-system score plus specific fixes. It's free to use (no card required), and you can pair it with our job matching tool to find UK roles where your current CV already scores 80%+. For deeper revisions, our 21 UK templates are all single-column, parser-tested designs — Crimson for office admin, Sage for NHS, Pulse for sales, Forge for trades.

If you've already started but need a recruiter-tested base, our 60-second free CV checker gives you an initial structural score in under a minute. For the broader UK ATS playbook, the ATS checker UK guide walks through scoring methodology, and the social-share-friendly 60-second checker walkthrough is the fastest entry point if you only have a coffee break. Pricing for SpeedCV starts at a £1.99 14-day pass; full annual access is £79.99 — see pricing.

FAQs

Are ATS checkers accurate?

Quality varies hugely. Generic global checkers built around US ATS models (mainly Taleo Enterprise) give misleading scores for UK applications because they don't simulate Bullhorn, NHS Jobs or Civil Service Taleo properly. A UK-focused ATS checker that benchmarks against Workday, Greenhouse and Bullhorn — the three systems covering the majority of UK private-sector recruitment — will give you a directionally accurate score within 5–8 points of the real ATS verdict.

Do recruiters actually use ATS to reject CVs?

Yes, but not in the way the internet suggests. ATS systems rarely auto-reject CVs outright; instead, they rank applications and surface the top 20–50 to human recruiters. If your CV parses badly or misses keywords, it ranks at position 200 of 400 and a human never opens it. The CIPD Resourcing and Talent Planning Survey consistently reports that mid-to-large UK employers receive far more applications than they can manually screen, so the practical effect of poor ATS performance is silent rejection.

What's the best free ATS checker UK?

Look for three features: UK-specific ATS coverage (Workday, Greenhouse, Bullhorn — not just generic models), job description matching (not just "upload and score"), and Equality Act 2010 compliance flags (warns about photos, dates of birth, marital status). SpeedCV's free ATS checker covers all three. Other reasonable options include Reed.co.uk's CV checker, though it focuses on Reed's own ATS rather than the broader landscape.

How long should an ATS-friendly CV be in the UK?

Two pages. Not one (that's the US convention) and not three (unless you're in academia or medicine with a publications list). UK recruiters expect two pages; ATS systems are tuned to parse documents in that range. CIPD recruitment guidance and major UK job boards (Reed, TotalJobs, Indeed UK) all reference the two-page standard. Cutting to one page often forces you to drop keywords the ATS needs to rank you.

Does PDF or Word work better for ATS?

It depends on the ATS. Our 500-CV test showed Workday and Greenhouse parse .docx files marginally more reliably (a 3–5% scoring improvement on average), while Bullhorn and Oracle Taleo actually handle PDFs better. If the job advert doesn't specify, default to PDF for agency applications (Bullhorn is dominant) and .docx for direct corporate applications. Never submit a scanned PDF — no ATS can read it.

What keywords should I include in my UK CV?

Mirror the job description's exact phrasing for required skills and qualifications. If the advert says "stakeholder management", don't write "managed stakeholders" — write "stakeholder management". UK-specific qualifications matter: ACA, ACCA, CIPD Level 5, PRINCE2, ITIL, NMC registration, GMC number. Include both acronyms and full forms ("ACCA (Association of Chartered Certified Accountants)") to capture both ATS keyword variants.

Can ATS read graphics, icons and skills bars?

No. Every ATS we tested — Workday, Greenhouse, Bullhorn, Taleo, iCIMS, SuccessFactors — ignores graphics, icons, progress bars and rating stars. They look modern but actively hurt your score because the ATS sees a gap where information should be. If you must have a visually designed CV (for creative roles where humans see the document directly), maintain a parallel ATS-friendly version for online submissions.

Is my CV stored under UK GDPR when I apply?

Yes. Once submitted, your CV is personal data under the UK GDPR and Data Protection Act 2018. Recruitment agencies typically retain CVs for 12–24 months under "legitimate interest". You have a right to request deletion at any time. Removing date of birth, marital status and full home address from your CV reduces what an agency can lawfully hold about you — useful for both privacy and Equality Act 2010 reasons.

Key takeaways

• UK ATS isn't one system — Workday, Greenhouse and Bullhorn dominate, each with different parsing rules.
• Bullhorn (used by Hays, Reed agency, Robert Walters) is the strictest — design for it.
• Single column, standard headings, two pages, no graphics — non-negotiable.
• Sector traps differ: NHS Jobs is form-based, Civil Service uses Behaviours + STAR, Big 4 weight ACA/ACCA keywords heavily.
• An ATS checker is only useful if it benchmarks against UK systems, not US-only models.
• ATS-friendly formatting doubles as GDPR-safer and screen-reader-accessible — same rulebook.