Before you upload a resume to an online job posting, a ten-second glance at the browser address bar tells you which applicant tracking system (ATS) powers the form. Most employers host their application flow on a vendor subdomain—such as *.myworkdayjobs.com, boards.greenhouse.io, jobs.lever.co, *.jobs.personio.de, *.teamtailor.com, *.icims.com, *.taleo.net, *.successfactors.eu, jobs.ashbyhq.com, or jobs.smartrecruiters.com—or embed the vendor's form using a recognizable query parameter like ?gh_jid=. Knowing the platform lets you anticipate its file-size limits, autofill behavior, and screening fields.
| URL pattern or parameter | ATS platform | Key upload & form check |
|---|---|---|
| *.myworkdayjobs.com (wd1, wd3, wd5) | Workday Recruiting | Review 'Autofill with Resume' steps; enter Skills and Languages manually |
| boards.greenhouse.io, job-boards.greenhouse.io, or ?gh_jid= | Greenhouse | Keep file under 2.5 MB; avoid multi-column tables and header/footer contact details |
| jobs.lever.co or jobs.eu.lever.co | Lever | Wait for live top-of-form autofill and verify Current company and profile URLs |
| *.jobs.personio.de or *.jobs.personio.com | Personio | Upload a single-column A4 PDF in the CV slot and attach Zeugnisse/certificates separately |
| *.teamtailor.com | Teamtailor | Keep contact links in the main page body and answer candidate-card screening questions |
| *.icims.com, *.taleo.net, or *.successfactors.eu | iCIMS / Oracle Taleo / SAP SuccessFactors | Use standard section headings, uniform MMM yyyy dates, and inspect imported profile fields |
Match the job posting URL and query parameters to the ATS vendor
When you click 'Apply' on a company's careers page or a job board, watch where the link redirects. Enterprise platforms route candidates to dedicated subdomains: Workday Recruiting uses *.myworkdayjobs.com (often with a data-center code like wd1, wd3, or wd5), Greenhouse uses boards.greenhouse.io or job-boards.greenhouse.io, Lever uses jobs.lever.co or jobs.eu.lever.co, Personio uses *.jobs.personio.de or *.jobs.personio.com, and Teamtailor uses *.teamtailor.com or a custom career.* subdomain with Teamtailor scripts.
If the address stays on the employer's main website domain (for example, acme.com/careers/apply?gh_jid=4928104), check the URL query string and the bottom of the application frame. A ?gh_jid= parameter indicates an embedded Greenhouse job board, while a 'Powered by' footer badge or iframe source URL often names Lever, Ashby, iCIMS, SmartRecruiters, or BambooHR directly.
Why large tech firms use custom portals while other employers use standard ATS vendors
Candidates often search for the ATS vendor behind major technology companies such as Google, Amazon, Meta, or Apple. Those global tech employers operate custom-built, first-party career portals (such as google.com/about/careers or amazon.jobs) integrated with their own internal recruiting databases rather than exposing a third-party public URL.
By contrast, thousands of growth-stage technology companies, financial institutions, consultancies, healthcare networks, and industrial employers rely on commercial platforms like Workday, Greenhouse, Lever, iCIMS, SAP SuccessFactors, Oracle Taleo, Personio, and Teamtailor. Even when an employer runs a custom front-end portal, the practical preparation remains the same: upload a clean, single-column, text-based PDF or Word (.docx) file and verify every field the form populates.
Use the ATS detector and verify portal autofill before submitting
Instead of memorising every subdomain pattern, you can paste any job posting link or career-page URL into Guul's ATS Detector (/tools/ats-detector) to identify the underlying platform and see its documented upload rules. Once you know whether the form runs on Workday, Greenhouse, Lever, or another system, run your resume through the browser PDF text check so you can confirm that headings, dates, and bullet points extract in top-to-bottom order.
Remember that identifying the ATS vendor helps you prevent file-size rejections and autofill scrambling—for instance, knowing that Greenhouse caps parsing at 2.5 MB or that Workday leaves Skills and Languages blank for manual entry—but the employer's own screening questions and human reviewers always govern the hiring decision.
Test your resume or job link right now (free, in-browser)
Run an instant local check in your browser tab without creating an account or uploading your file to a server.