What Evidence Actually Says About ATS Resumes for Engineers in 2026

If you have spent more than ten minutes researching how to write a resume for an applicant tracking system (ATS), you have likely encountered conflicting advice. One source tells you to use a single-column layout. Another says a two-column design is fine as long as the text is machine-readable. A third insists that PDFs are poison and Word documents are the only safe option.

As a senior editor at FlowCreate, I read dozens of these articles every week. Most of them share one thing in common: they cite no evidence. They rely on anecdotal experience from a single recruiter, or worse, on assumptions about how ATS software works that were last accurate in 2015.

This article takes a different approach. I have reviewed the available peer-reviewed research on resume screening, recruiter decision-making, and keyword matching. I have also drawn on publicly documented behavior from major ATS vendors and hiring platforms. The goal is to give you, a practical job seeker or career changer, advice that is specific, trustworthy, and grounded in what we actually know.

What ATS Software Actually Does (and Does Not Do)

Before we talk about formatting and keywords, it helps to understand the tool you are trying to satisfy. An ATS is not a single piece of software. It is a category that includes dozens of platforms, from Workday and Taleo to Lever, Greenhouse, and iCIMS. Each one parses resumes differently.

However, research published in the International Journal of Selection and Assessment and similar outlets consistently finds three common functions across most ATS platforms:

• Parsing: The system extracts text from your resume and maps it to fields such as job title, employer, dates, skills, and education.
• Keyword matching: The system compares the extracted text against a list of required and preferred qualifications from the job description.
• Ranking or filtering: Based on the match score, the system either ranks candidates or automatically rejects those who fall below a threshold.

Crucially, no major ATS currently uses natural language understanding to interpret your career narrative. That means a well-written summary of your leadership philosophy will not help you if the system cannot find the specific skills it was told to look for. Conversely, a resume that is formatted poorly may fail to parse at all, leading to an automatic rejection regardless of your qualifications.

What the Parsing Research Shows

In 2022, researchers at a European technical university tested how four common ATS platforms parsed resumes with different layouts. Their findings, published in a conference proceedings on human-computer interaction, revealed that:

• Resumes with tables, text boxes, and columns caused parsing errors in three out of four systems.
• Headers and footers containing contact information were missed by two systems entirely.
• Bullet points were parsed correctly in all four systems, but only when they were standard list bullets, not custom icons or symbols.
• PDFs were parsed with lower accuracy than Word documents in two of the four systems, but the difference was small (under 5 percent).

The practical takeaway: simple formatting wins. Use standard bullet points, avoid tables and text boxes, and place critical information (name, phone, email) in the main body of the document, not in a header or footer. If you are applying through a platform that explicitly asks for a Word document, use that format. Otherwise, a clean PDF is fine.

The Real Role of Keywords in an ATS Resume

Keyword stuffing is one of the most common mistakes I see. Job seekers will cram thirty technical skills into a single line, hoping to trigger every possible match. But evidence from both academic research and industry data suggests this approach backfires.

A 2021 study in the Journal of Business and Psychology examined how recruiters evaluated resumes that were optimized for keywords versus resumes that were written naturally. The researchers found that recruiters could detect keyword stuffing in under ten seconds, and they rated those candidates as less competent and less hirable. The ATS may give you a high match score, but the human reviewer will penalize you for it.

The smarter approach is to integrate keywords into your experience bullet points. Instead of writing a separate list of skills, demonstrate each skill in context. For example:

Weak: Python, SQL, AWS, Docker, Kubernetes, Jenkins, Git, Agile
Strong: Deployed Python-based microservices on AWS ECS using Docker and Kubernetes, reducing deployment time by 40 percent.

The second version includes the same keywords, but it also provides evidence of impact. The ATS will still find the keywords, and the recruiter will see proof of competence.

How to Identify the Right Keywords

Evidence from hiring data suggests that the most effective keywords are not necessarily the ones listed under “Required Skills.” They are the ones that appear multiple times in the job description, especially in the responsibilities section. A 2023 analysis of 10,000 job postings on a major job board found that skills mentioned in both the “Requirements” and “Responsibilities” sections were three times more likely to be used as screening criteria than skills mentioned only once.

To identify these keywords, read the job description carefully. Highlight every technical skill, tool, methodology, and certification that appears more than once. Then look for verbs that describe the work: “designed,” “implemented,” “optimized,” “led.” These are the terms you should weave into your resume.

Engineer Resume Structure: What the Data Supports

Engineers often ask me whether they should use a functional resume (skills-focused) or a chronological resume (experience-focused). The research is clear on this point. A 2018 study in Personnel Psychology found that chronological resumes were rated significantly higher by both recruiters and hiring managers across all industries, including engineering. Functional resumes were viewed as less trustworthy and more difficult to evaluate.

For engineers, the most effective structure is a hybrid: a brief summary or headline, followed by a technical skills section, followed by a reverse-chronological work experience section. This format satisfies both the ATS (which needs to find keywords quickly) and the human reader (who wants to see progression and impact).

What to Include in Each Section

Here is a checklist based on evidence from recruiter behavior studies and ATS parsing research:

• Contact information: Name, phone number, email, LinkedIn URL, and city/state. Do not include your full street address; research shows it does not improve callback rates and may invite bias.
• Professional summary (2–3 lines): State your role, your years of experience, and one or two key achievements. Avoid generic phrases like “results-oriented team player.”
• Technical skills: List 8–12 relevant skills in a single line or simple column. Do not use progress bars or star ratings; ATS parsers cannot interpret them.
• Work experience (reverse chronological): For each role, include job title, company name, location, and dates. Use bullet points that start with a strong action verb and include a measurable result where possible.
• Education: Degree, institution, and graduation year. If you are a recent graduate, place this section before work experience. Otherwise, place it after.
• Certifications and projects (optional): Include only if they are directly relevant to the job you are applying for.

Career Changers: How Evidence Supports a Pivot

If you are an engineer moving into a new industry or a non-engineer moving into an engineering role, the evidence suggests you should emphasize transferable skills and domain knowledge over job titles.

A 2020 study in the Journal of Vocational Behavior found that career changers who explicitly connected their past experience to the new role in their resume summary were 40 percent more likely to receive an interview invitation than those who simply listed their past jobs without context. The key is to create a narrative bridge.

For example, if you are a mechanical engineer applying for a software engineering role, do not just list your CAD experience. Instead, write something like:

Mechanical engineer with 5 years of experience designing automated manufacturing systems. Proficient in Python for data analysis and process simulation. Seeking to apply systems-thinking and programming skills to a software engineering role.

This summary tells the recruiter exactly why your background is relevant. It also includes the keywords “Python,” “data analysis,” and “software engineering,” which the ATS will pick up.

Formatting Decisions That Affect ATS Parsing

Beyond keywords and structure, several formatting choices can make or break your resume in an ATS. Here is what the evidence says:

File Format

As noted earlier, PDFs are parsed with slightly lower accuracy than Word documents on some systems. However, the difference is small. The safest approach is to check the application instructions. If the employer asks for a Word document, use that. If they do not specify, a clean PDF is acceptable. Avoid image-based PDFs (scanned documents) at all costs; they are invisible to ATS parsers.

Font and Size

A 2022 usability study found that ATS parsers handle standard fonts (Arial, Calibri, Times New Roman) equally well. Unusual fonts or decorative typefaces may cause parsing errors. Use a font size of 10 to 12 points for body text and 14 to 16 points for section headers.

Margins and Spacing

Standard one-inch margins are safe. Narrower margins (0.5 inches or less) can cause text to be cut off during parsing. Use single or 1.15 line spacing for body text and add a blank line between sections.

Bullet Points

Use standard round or square bullet points. Avoid emojis, arrows, or custom symbols. Some ATS parsers cannot read them and will skip the entire line.

How to Test Your Resume Before You Apply

You do not need to guess whether your resume will parse correctly. Several free tools allow you to upload your resume and see how an ATS would interpret it. FlowCreate’s resume builder includes a real-time ATS readability score that highlights potential parsing issues before you submit your application. You can also copy your resume text into a plain-text editor like Notepad. If the formatting looks clean and the information is in the right order, your resume will likely parse correctly.

Another simple test: save your resume as a PDF and use the “Select All” function. If you can highlight and copy all the text in the correct order, the ATS will be able to parse it. If you see gaps, missing sections, or text that appears out of order, reformat before you apply.

What the AI Era Actually Changes

There is a lot of hype about AI-powered ATS systems that can read your resume like a human. The reality is more mundane. Most ATS platforms have added basic AI features, such as automated skill extraction and candidate ranking based on historical hiring data. But these systems still rely on the same parsing and keyword-matching fundamentals.

One genuine change is that some ATS platforms now use machine learning models to identify “soft skills” from your bullet points. For example, if your resume says “mentored three junior engineers,” the system may tag you as having leadership and teaching abilities. This means you should be explicit about the skills you want to highlight. Do not assume the system will infer them.

Another change is the rise of generative AI tools that can write resume content for you. While these tools can save time, they often produce generic language that both ATS and recruiters can detect. A 2024 analysis of 500 resumes submitted through a popular job board found that resumes flagged as “likely AI-generated” had a 30 percent lower interview rate. The safest approach is to use AI as a brainstorming tool, not a ghostwriter. Write your own bullet points, then use AI to polish the phrasing.

Final Checklist Before You Submit

Before you send your next application, run through this evidence-based checklist:

• Does your resume use a single-column layout with no tables or text boxes?
• Is your contact information in the main body of the document, not in a header or footer?
• Have you integrated keywords from the job description into your experience bullet points, not just a separate skills list?
• Does each bullet point start with a strong action verb and include a measurable result when possible?
• Is your file format appropriate for the application (Word if requested, otherwise clean PDF)?
• Have you tested your resume with a plain-text copy or an ATS readability tool?
• Does your professional summary connect your past experience to the role you are applying for?

If you can answer yes to all seven questions, your resume is ready to perform well in both the ATS and the human review that follows.

Conclusion

Writing a resume that works in the AI era does not require guessing or following trends. It requires understanding what the evidence says about how ATS systems and recruiters actually behave. Use simple formatting, integrate keywords naturally into your experience, prioritize a chronological structure, and test your document before you submit. These steps will serve you better than any hack or rumor.

If you want to build a resume that follows these evidence-based principles, FlowCreate’s resume builder includes templates designed for ATS compatibility and recruiter readability. You can focus on your story while the structure handles the parsing.