How ATS Systems Work at US Employers (and What Actually Gets You an Interview)

What is an applicant tracking system?

Most mid-size and large US employers, and many small ones, run their hiring through an applicant tracking system. When you click Apply on a company career page, your application usually lands in a system such as Greenhouse, Lever, Workday, Ashby or iCIMS, even if you never see its name. The system stores your resume, your answers to the application questions, and the notes the hiring team adds as they move you through stages such as recruiter screen, interview and offer.

It helps to think of the ATS as a shared spreadsheet with a search bar. Its job is to keep hundreds of applications for one role organized so that a small team can review them, compare them and communicate with candidates.

What happens to your resume after you submit it?

When you upload a file, the system runs a parser. The parser reads the text in your PDF or Word document and tries to sort it into fields: name, email, phone, job titles, employers, dates, schools, degrees and skills. Some systems then show the recruiter both the original file and the parsed fields side by side.

This is where formatting matters. If the parser cannot tell where one section ends and the next begins, dates can end up attached to the wrong job, or a section can be skipped. A recruiter who searches for a skill that your resume mentions may not find you if that text was never extracted.

Does an ATS automatically reject resumes?

In most cases the software does not decide on its own that you are a bad fit. Recruiters and hiring managers make the decisions, and the system helps them search and sort. What can screen people out are the questions employers add to the form, such as work authorization or a required certification, and the recruiter filters they apply, such as a search for a specific tool or a location.

Some systems also offer ranking or matching features, and employers differ in how much they rely on them. Because you cannot see how a given employer has configured things, the practical approach is to make your resume easy to read for both a parser and a person.

What formatting problems cause parsing errors?

• Text placed inside images, icons, charts or skill-rating bars, which the parser cannot read.
• Contact details stored in the page header or footer, which some parsers ignore.
• Multiple complicated columns, tables and text boxes that scramble the reading order.
• Unusual section names such as "My Journey" instead of Experience or Education.
• Scanned resumes saved as images instead of real text.
• Inconsistent date formats that make it hard to tell how long you held a role.

How do I make my resume readable to an ATS?

Start with a simple layout. A single column with clear headings is the most reliable, and a clean two-column design usually works when it is built from real text. Save as a text-based PDF unless the employer asks for a Word file, then open the PDF and try to select and copy every line. If you can copy it in a sensible order, a parser probably can too.

• Use standard headings: Education, Experience, Projects, Skills.
• Put your name, email, phone and links in the body of the page.
• Write dates consistently, for example "Jun 2025 to Aug 2025".
• List skills as plain text, grouped into categories.
• Use common fonts and ordinary bullet characters.

How should I use keywords from a job posting?

Recruiters often search by the skills and tools named in the posting, so your resume should use the same words when they honestly describe your experience. If the posting says "REST APIs" and you built them, write "REST APIs". Place each keyword where it is supported, such as inside a project or internship bullet, and again in your Skills section. Skip anything you could not discuss in an interview, and never hide keywords in white text. Recruiters read the resume too, and hidden text can get an application discarded.

What else helps you get noticed?

A parsed resume is only the first step. After that a person reads it, often for less than a minute, so concrete results near the top of each bullet matter. Applying early, sending a short note to a recruiter when a contact is available, and getting a referral from someone at the company can all help, because a referred application is usually reviewed by a person right away. Treat the ATS as a hurdle you clear by being clear, not a gate you beat with tricks.