15 ATS Keywords Software Engineers Forget to Put on Their Resume

Your resume lists React, TypeScript, and Node. So does everyone else's. Meanwhile the keyword that would have matched you to the role — the one describing work you actually did — never made it onto the page, and the ATS moved on.

This isn't about stuffing buzzwords. Recruiters search the ATS database with specific terms, and if your resume doesn't contain the terms for work you've genuinely done, you're invisible for roles you'd be great at. Engineers are especially guilty of this: we write what we built, not what it's called in hiring language.

Here are 15 terms engineers do constantly but forget to write down, grouped by category. For each one: what recruiters search, and why it matters.

Practices and process

1. CI/CD. You push code and it deploys itself — that's CI/CD, and it's one of the most searched terms in backend and DevOps-adjacent postings. If you've touched GitHub Actions, Jenkins, GitLab CI, or CircleCI, the term "CI/CD" belongs on your resume. Name the tool too; recruiters search both.

2. Code review. "Reviewed pull requests" sounds mundane, so engineers leave it off. But "code review" signals seniority — it means someone trusted your judgment on other people's code. One bullet is enough: "Reviewed 10+ PRs weekly across a 6-engineer team."

3. Unit testing / integration testing. Writing tests is invisible work that hiring managers specifically filter for. Don't just list "Jest" or "JUnit" in your skills — write the practice into a bullet: "Raised test coverage from 40% to 75% with Jest unit and integration tests." The words "unit testing" and "integration testing" are what get searched.

4. Agile / Scrum. Most teams run some flavor of it, and "Agile" still appears in a huge share of job descriptions. If you did sprint planning, standups, and retros, say "Agile/Scrum" plainly instead of assuming it's obvious.

Data

5. SQL / query optimization. Backend engineers write SQL daily and list "PostgreSQL" in skills — then never write the word "SQL" itself. Some ATS searches match the literal term "SQL" and miss the database name. Include both. And if you've ever fixed a slow query, "query optimization" is a high-signal phrase: "Optimized slow queries, cutting report generation time 60%."

6. Caching. You added Redis to stop hammering the database — that's "caching," a term architects and backend leads search for. Write it as a strategy, not just a tool: "Implemented Redis caching layer, reducing database load 70%."

7. Data modeling. Designed a schema? That's data modeling, and it's a distinct searched skill from just "knowing Postgres." Engineers treat schema design as part of the job; hiring managers treat it as a qualification.

Architecture

8. RESTful APIs / API design. "Built endpoints" is what you write; "RESTful API design" is what gets searched. If you designed routes, versioned an API, or wrote API contracts, use the formal term at least once.

9. Authentication & authorization. You implemented login with OAuth or JWT — recruiters search "authentication," "OAuth 2.0," and "JWT." "Set up auth" in a bullet matches nothing. "Implemented OAuth 2.0 authentication with JWT-based session management" matches three searches.

10. Microservices. Even if your architecture was "a few services talking to each other" rather than textbook microservices, the term describes the reality of distributed work: service boundaries, inter-service communication, independent deploys. If that's what you did, name it.

Operations

11. Docker / containerization. "The app runs in Docker" is infrastructure reality for most teams now, and "Docker" plus "containerization" are baseline filters for backend and platform roles. If you wrote a Dockerfile or debugged a container issue, it counts.

12. Monitoring & logging. You added Datadog dashboards or dug through CloudWatch logs at 2 AM — that's "monitoring and logging," and reliability-focused roles search for exactly that. One bullet: "Set up Datadog monitoring and alerting, cutting mean time to detection from hours to minutes."

13. Cloud deployment. Listing "AWS" in skills is table stakes; "deployed to AWS" or "cloud deployment" describes what you did with it. Recruiters distinguish between engineers who've used a cloud console and engineers who've shipped to one.

Craft

14. Performance optimization. Made something faster — a query, a page load, a bundle size? The umbrella term "performance optimization" is what gets searched, and it covers all of it. Pair it with the number: "Cut initial page load 45% via code-splitting and lazy loading."

15. Technical documentation / API documentation. Wrote a README that saved onboarding time? Documented endpoints with OpenAPI/Swagger? "Documentation" signals the senior-level habit of making knowledge durable. Teams hiring senior engineers filter for it.

Where to put them (placement matters as much as the words)

Keywords in the wrong place look stuffed; in the right place they look like a career. Three zones:

1. Skills section — exact terms, both forms. CI/CD (GitHub Actions), SQL (PostgreSQL), OAuth 2.0 / JWT. This is the machine-readable index. Mirror the job description's exact phrasing here.
2. Experience bullets — terms inside real work. Every keyword above should appear inside a bullet describing something you actually built, with an outcome. "Implemented Redis caching, cutting p95 latency 50%" beats a lonely "Redis" in a skills list, for both the parser and the human.
3. Summary line — the 3–4 heaviest hitters. If the role is backend-heavy, your summary mentions REST APIs, SQL, and CI/CD. This is the first thing the parser and the recruiter both read.

And the rule that keeps all of this honest: only list what you've actually done. Keyword optimization is translation, not invention — describing real work in the language hiring uses. The moment you list a tool you've never touched, it becomes lying, and it will surface in a technical interview.

The 10-minute keyword audit

Pull up the last job description you applied to (or want to apply to). Highlight every technical term in it. Now search your resume for each one — Ctrl+F, literally. Every highlighted term that's missing but describes work you've done is a keyword to add this week, in a skills entry or a bullet.

Do that against five job descriptions and a pattern emerges: the same 10–15 terms keep appearing. Those are your market's vocabulary. Learn to speak it on paper the way you already speak it in standup.

If you want a head start

Rewriting a resume around the right keywords from a blank page is slow, which is why I put together the ATS Resume Template Pack for Software Engineers ($15): three ATS-safe templates — classic single-column, skills-forward, and senior/staff — plus a setup guide and the full ATS checklist, so the formatting is handled and you can focus on the words.

But honestly? Even if you never buy anything, run the Ctrl+F audit against your target job descriptions today. Ten minutes, and you'll see exactly which of these 15 terms your resume is missing.