ATS Keyword Database › Software Engineer

ATS Keywords for Software Engineers (2026) — Junior, Mid, Senior, Lead

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These are the ATS keywords actually found in real software-engineer job descriptions and the US Bureau of Labor Statistics occupational data. Tiered by seniority — junior, mid, senior, and staff/lead — because what an SDE-I needs to surface is not what a Staff Engineer needs to surface. Run your resume through our free scanner to see which of these your ATS actually extracts from your file.

Last updated: 2026-05-15

93 keywords across 12 categories

32 JDs sampled + 3 O*NET occupations

How we sourced these →

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Why this software engineer keyword list is different

Most resume-keyword lists you'll find online are unsourced — a marketer's guess at which terms recruiters care about, or an LLM-generated wall of synonyms with no provenance. This database is built from two verifiable sources only:

O*NET — the US Bureau of Labor Statistics occupational database. Every O*NET tag below maps to a specific occupation code (15-1252.00, 15-1254.00, 15-1257.00).
Real job descriptions — 32 actual public software engineer JDs we manually curated from Greenhouse boards (boards.greenhouse.io), Lever boards (jobs.lever.co), Workday public career sites. Every JD tag below maps to language we observed in those descriptions.

Nothing here is fabricated, scraped from LinkedIn, or auto-generated. You can verify any term by checking the O*NET code or by searching the JD-source platforms yourself. This is the keyword list we wish existed when we were running parser tests on hundreds of resumes — every term tagged, every claim sourced.

Always include (every level)

These keywords appear in roughly 90%+ of the job descriptions we sampled across all seniority levels. If they're missing from your resume — junior or senior — you're failing the keyword match before any review happens.

Core foundations every SWE resume needs

Every level of software-engineering JD references these. If your resume doesn't surface them, you're missing the floor. These appear in roughly 90%+ of the JDs we sampled.

Git
O*NET + JD
Version-control system; cited in nearly every JD
Code review
O*NET + JD
Process keyword that Workday matches against
Agile
O*NET + JD
Methodology keyword. Synonyms: Scrum, Kanban
Unit testing
JD
Quality keyword; appears in 28/32 JDs
REST API
O*NET + JD
Standard for backend roles, often listed in skills
SQL
O*NET + JD
Database keyword; even frontend roles list it
CI/CD
JD
Continuous integration / continuous deployment

Junior / Entry-level keywords (0–3 years)

Junior job descriptions filter heavily on specific technical training. Your resume needs explicit, named tokens — not generic skill categories.

Languages & frameworks (junior signal)

Junior JDs list specific languages explicitly because hiring managers are filtering on technical training. Generic skills like 'collaborates well' do not parse as keywords — specific language names do.

Python
O*NET + JD
Java
O*NET + JD
JavaScript
O*NET + JD
TypeScript
O*NET + JD
React
O*NET + JD
Node.js
O*NET + JD
HTML5
O*NET + JD
CSS3
O*NET + JD
C++
O*NET
C#
O*NET

Computer-science fundamentals (junior signal)

Junior SWE JDs are heavily weighted toward CS-fundamentals signaling because the candidate has limited industry experience. List these explicitly in a Skills section, not buried inside experience bullets.

Data structures
JD
Algorithms
JD
Object-oriented programming
O*NET
Big-O analysis
JD
Signals algorithmic depth in junior context
Debugging
O*NET
Pair programming
JD

Tools & environment

Tool-name keywords are specific tokens recruiters search. Generic 'used dev tools' will not match — naming the tool will.

GitHub
O*NET + JD
VS Code
JD
Linux
O*NET + JD
Docker
JD
Increasingly listed even at junior level
Jira
JD
Postman
JD

Mid-level keywords (3–6 years)

Mid-level JDs add architecture vocabulary and ownership signals. The shift from junior is that you're expected to own features end-to-end and design components, not just implement them.

Architecture & system-design keywords (mid signal)

Mid-level JDs start filtering on architecture vocabulary. These are the tokens that distinguish 'codes features' from 'designs systems'.

Microservices
JD
Distributed systems
JD
API design
O*NET + JD
Database design
O*NET
Performance optimization
JD
Caching
JD
Redis, Memcached, in-memory cache
Message queues
JD
RabbitMQ, Kafka, SQS
Event-driven architecture
JD

Cloud platforms (mid signal)

Cloud-provider keywords are explicit-match. Workday and Greenhouse both treat 'AWS' and 'Amazon Web Services' as the same token; 'cloud experience' is too generic to match.

AWS
O*NET + JD
Amazon Web Services
O*NET + JD
Google Cloud Platform
O*NET + JD
GCP
O*NET + JD
Microsoft Azure
O*NET + JD
Lambda
JD
Serverless functions — often listed explicitly
S3
JD
EC2
JD
DynamoDB
JD
PostgreSQL
JD

Ownership & delivery vocabulary (mid signal)

Mid-level JDs filter for ownership signals. These verbs and nouns appear in nearly every mid-level Greenhouse posting we sampled.

Feature ownership
JD
On-call rotation
JD
Production debugging
JD
Cross-functional collaboration
JD
Technical documentation
O*NET + JD
Code review (as reviewer)
JD

Senior keywords (6–10+ years)

Senior JDs filter on system-design depth and technical leadership. Even individual-contributor senior roles expect cross-team influence vocabulary.

Senior-engineer system-design vocabulary

Senior JDs filter heavily on system-design keywords. If these are missing from your resume but in your actual experience, you're failing the keyword match for roles you'd otherwise crush.

Scalability
O*NET + JD
High availability
JD
Fault tolerance
JD
Load balancing
JD
Horizontal scaling
JD
Eventual consistency
JD
CAP theorem
JD
Database sharding
JD
Service mesh
JD
Observability
JD
Logging, metrics, tracing

Infrastructure & DevOps (senior signal)

Senior JDs nearly always list infrastructure tokens, even for non-DevOps engineers. Hiring managers expect senior engineers to understand the deployment pipeline.

Kubernetes
JD
Docker
O*NET + JD
Terraform
JD
Infrastructure as code
JD
CI/CD pipelines
JD
GitHub Actions
JD
Jenkins
JD
Helm
JD

Technical leadership signals (senior)

Senior-engineer JDs filter for leadership context even for individual-contributor tracks. List these where they apply truthfully.

Technical leadership
JD
Mentorship
JD
Architectural decisions
JD
Design reviews
JD
Technical roadmap
JD
Hiring (technical interviews)
JD
Cross-team alignment
JD

Staff / Principal / Lead keywords (10+ years)

These roles filter for strategy, influence-over-authority, and org-wide impact. Senior keywords alone won't pass these filters.

Staff / Principal / Lead engineer vocabulary

Staff and Principal Engineer JDs filter for strategy and influence-over-authority signals. Pure-IC senior engineers without these signals often fail Staff-level keyword filters.

Technical strategy
JD
Engineering excellence
JD
Org-wide impact
JD
Technical vision
JD
Influence without authority
JD
Multi-team coordination
JD
Long-term architecture
JD
OKR setting (engineering)
JD
Engineering quality metrics
JD

Engineering-management adjacent (Tech Lead / EM track)

If you're targeting EM or hybrid TL roles, these tokens appear in JDs that other Staff-IC roles don't have.

Direct reports
JD
People management
JD
Performance reviews
JD
1:1 coaching
JD
Hiring plan
JD
Budget ownership
JD

How to actually use these

How to actually use these in your software-engineer resume:

Skills section first, evergreen tier always. Include the "Core foundations" keywords explicitly in a dedicated Skills section near the top of your resume. ATS parsers (especially Workday and SuccessFactors) weight the Skills section more heavily than experience bullets for keyword matching.

Match the tier to the role you're applying for, not your current title. Applying for a Senior role? Surface senior-tier keywords even if you're currently Mid. Applying for Staff? Surface Staff-tier vocabulary. Recruiters and ATS filters key off the keywords matching the role's level, not your job title.

Specific tool names, not generic categories. Write "PostgreSQL" not "relational databases". Write "AWS Lambda" not "serverless". The parser is doing literal token-matching; "relational databases" matches roughly nothing in a JD that says "PostgreSQL experience required".

Don't keyword-stuff. Listing 50 languages you used once each fools no ATS in 2026 and embarrasses you with the recruiter who reads after the filter. Pick the 8-15 keywords that genuinely describe your work. Keyword stuffing is the #1 reason senior engineers get filtered as "junior" by Workday — the parser sees breadth but no depth signal.

Run the scanner. Upload your current resume to our free scanner — you'll see which of these keywords actually extract from your file. Two-column "modern" templates frequently dump skills into a sidebar that Workday and Greenhouse read separately from the main column, meaning your Python/Kubernetes/Terraform list never gets associated with your experience.

Frequently asked questions

What are the most important ATS keywords for a Software Engineer in 2026?

The evergreen keywords every Software Engineer resume needs include: Git, Code review, Agile, Unit testing, REST API. These appear in roughly 90%+ of the 32 job descriptions we sampled across seniority levels. The full tiered list (junior, mid, senior, lead) is on this page — see also the related profession pages and our methodology page for sourcing details.

Where are these ATS keywords sourced from?

Two sources: (1) O*NET — the US Bureau of Labor Statistics occupational database, occupation codes 15-1252.00 (Software Developers), 15-1254.00 (Web Developers), 15-1257.00 (Web and Digital Interface Designers). (2) Manual curation of 32 real public job descriptions from Greenhouse boards (boards.greenhouse.io), Lever boards (jobs.lever.co), Workday public career sites. Every keyword on the page is tagged with its source. We do not scrape Indeed or LinkedIn, and we do not fabricate entries.

Do I need to include all of these keywords on my resume?

No — and stuffing 50+ keywords backfires in 2026. Modern ATS parsers (especially Workday and Greenhouse) penalize keyword density above ~1.5%. Pick the 8-15 keywords from the tier matching your target role's seniority that genuinely describe your work, and weave them into both your Skills section and your experience bullets. Depth beats breadth.

Which ATS engines do Software Engineer employers most commonly use?

Based on our JD sample, the most common ATS engines for Software Engineer roles are Greenhouse, Lever, Workday, Ashby. Each ATS has slightly different parsing tolerances — full per-engine guides are available at /ats.

How often is this keyword list updated?

We re-sample 30+ fresh job descriptions per profession monthly to catch emerging tools and terminology (Cursor, Claude Code, Devin in 2026; new methodologies and certifications as they appear). The "Last updated" stamp at the top of the page reflects the most recent re-curation date.

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