Before your resume reaches a human, it passes through software that has no interest in your achievements. Understanding how it works is not optional.

Before your resume reaches any human being, it passes through a piece of software that has no interest in your achievements, your personality, or the care you took with the formatting. It is scanning for specific words and phrases. If it does not find them, your application goes into a folder that no human may ever open.

This software is called an Applicant Tracking System, or ATS. Almost every midsize to large company uses one. Many smaller ones do too. And yet most of the career advice given to students and early career professionals treats the job search as if a human is the first thing that sees their resume. They are not.

How the Logic Works

The employer writes a job description using specific language: required skills, preferred qualifications, job titles, software names, and industry terms. The ATS scans incoming applications for that language. A resume that uses the employer’s words scores higher. A resume that expresses identical qualifications in a different language scores lower, even if the candidate is equally or more qualified.

The human stage after the software is just as fast. 인크루트’s survey of 475 Korean HR managers found 62.3% spend less than five minutes on a resume and 자기소개서 combined, and 90.1% weigh job experience above everything else. The ATS decides first; the reader decides in the next four minutes.

This creates a real problem for candidates who write well. A resume that says “coordinating cross functional communication” may not register if the job posting says “stakeholder management.” The candidate has the skill. The resume does not show a match because the vocabulary is different. The system moves on.

How Many Employers Let the Software Make the First Cut

This is not a niche practice. Harvard Business School and Accenture surveyed employers in the US, the UK and Germany for their Hidden Workers research, and Joseph Fuller summarised what they found in Harvard Business School Working Knowledge in November 2021. The two numbers below are worth knowing before you send anything.

The same piece reports that among the hidden workers the researchers studied, only one in five made the first cut. That is the gap this post is about. Most of the people the software filtered out were not unqualified. Their resumes described real experience in words the system was not looking for.

Take Hyejin, 27, an HR operations associate at a game company in Pangyo. She applied to six people operations roles at global software firms with Seoul offices and heard nothing back from five. Her experience was a good match for all six. Her resume, written for her current company’s internal review, used her company’s words for everything.

The Fix: Language Alignment

Read the job description carefully before writing or revising your resume for that role. Identify the specific terms it uses for skills, responsibilities, and qualifications. Use those terms on your resume, in context, where they accurately reflect your experience. The goal is not to stuff keywords randomly. It is to align your language with the employer’s language in the same way that a good brief aligns with the client’s vocabulary.

Nothing in the right hand column is invented. Hyejin did every one of those things. The only change is that each line now uses a term the posting uses, inside a sentence that shows she did it. That is the difference between alignment and stuffing: stuffing adds words, alignment translates evidence. After the rewrite she applied to four more roles and was invited to two first interviews.

Formatting and File Format

Formatting matters as much as language. Tables, text boxes, columns, headers and footers, and graphics can all create parsing errors. A beautifully designed two column resume can appear nearly blank to an ATS because the system cannot read content inside columns. Clean, single column formatting with standard section headings is safer for automated screening, even if it looks less visually interesting. Unless an application specifically requests a PDF, submit as a .docx file. Some ATS versions still parse Word documents more reliably.

Hyejin’s original file had this problem too. She had built it in a design template with her skills in a narrow left column and her experience on the right, because that is what looked professional to her team. When she pasted the text of her own PDF into a plain document, the left column came out first and the right column came out as one long run of sentences with the dates stripped away. That is roughly what a parser sees. She rebuilt it in a single column with Work Experience, Education and Skills as the only headings, kept one accent colour for her name, and lost nothing a human reader cared about.

The Korean Context

For students applying to Korean companies, this applies equally to Korean language applications. Major Korean 공채 recruitment platforms run similar keyword logic. The job description is the source document. Your resume is the response to it. Make sure they are speaking the same language. Passing the ATS is the cost of entry. Your actual argument for the role begins after you clear that gate.

Korean employers started reading applications with software years ago. In 2018 Lotte Group adopted a system to read and analyze 자기소개서 essays that also scans for terms predicting whether a candidate fits a role, and BGF Retail, which runs CU convenience stores, used similar technology to check essays for plagiarism (Korea JoongAng Daily, 13 March 2018). So the vocabulary rule holds in both languages. If you are writing an English resume for a foreign company in Seoul, the formatting habits change as well, and I set those out in what ATS software looks for in an English resume.

A Twenty Minute Check Before You Submit

You do not need special software for most of this. You need the posting, your resume, a highlighter and twenty minutes. This is the check I ask people to run on every application before it goes out.

Step three is where most keyword advice goes wrong. A skills list stuffed with the posting’s terms may pass the software, but the recruiter who opens it next is looking for proof, which is the argument in your resume is not a list of jobs. Whatever gets you through the filter also has to hold up in the interview, because what is on the resume and who is in the chair get compared quickly.

To check the result, paste your resume and the job advert into Resume Radar, which scores the match and shows the gaps. If your lines still read like duties, Trace Your Impact will help you turn them into results first.

→  Application strategy, including ATS optimization and resume review, is part of what a 1:1 coaching session covers. The Work With Us page has more on how that works.

If you want practical tools to sharpen how you communicate professionally, the communication tools on this site are a useful starting point.

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