Resume Writing Guide
How to Write a Resume — Complete Step-by-Step Guide
A practical guide for mid-to-senior professionals — from format and structure to bullet points, ATS optimization, and what hiring managers actually look for in the first 6 seconds.
Most resume advice focuses on formatting. The actual problem is signal — whether your resume communicates your level, scope, and fit clearly enough for a hiring manager to take 30 more seconds. This guide fixes both.
- Format and structure — what works, what fails ATS
- How to write a professional summary
- How to write bullet points that show impact
- ATS keyword optimization — step by step
- How to tailor a resume to a job description
- What hiring managers look for in 6 seconds
- The most common resume mistakes
What makes a resume get interviews
Most resume advice misses the real problem. It tells you to "use action verbs" and "quantify your achievements" — which is correct but incomplete. The deeper issue is signal clarity: whether your resume communicates your level, scope, and fit within the first 6 seconds of a recruiter's scan.
A resume that gets interviews does three things simultaneously: (1) It passes ATS filtering by matching the right keywords. (2) It communicates seniority and scope immediately through title, company, and headline bullets. (3) It demonstrates value through outcomes, not activity. Most resumes fail on number 2 — the human reads fine but lands wrong.
The 6-second scan — what recruiters actually see first
Eye-tracking studies show recruiters spend 6–10 seconds on the initial scan before deciding whether to read further. In those seconds they are looking at: (1) Current title and company. (2) Most recent bullet points. (3) Education section. (4) Total years of experience.
The implication: your most impressive signal should appear in the first 10 lines of your resume. Not in the third role down, not buried in a mid-page bullet. Your name, current title, company tier, and your two most impactful bullets should communicate your level without the recruiter needing to dig.
Resume format — what to use and what to avoid
Use this format
- Reverse chronological — most recent role first, working backward. Standard expectation.
- Single column — ATS systems parse single-column layouts reliably. Two columns fail unpredictably.
- Standard section headers — Work Experience, Education, Skills. Not "Career Journey" or "My Story."
- Clean font — Calibri, Garamond, Georgia, Arial. 10–12pt for body text.
- Consistent margins — 0.5 to 1 inch. More space = better readability.
- No tables, no text boxes — These break ATS parsing entirely.
- PDF or DOCX — Check the application instructions. Both are standard; DOCX parses more reliably in many ATS systems.
Avoid this
- Graphic/design-heavy templates — Look impressive, fail ATS. Use sparingly only for creative roles where design itself is the work.
- Functional resume format — Lists skills at the top without chronological context. Raises red flags for most hiring managers.
- Objective statement — Outdated. Replace with a professional summary that leads with what you offer, not what you want.
- Photo — Not standard in the US. Omit unless explicitly requested.
- References on resume — "References available upon request" wastes space. Assumed.
- Personal information — No age, marital status, nationality.
- Headers and footers with key info — ATS often skips headers and footers. Contact info goes in the main body.
How to write resume bullets that actually work
The formula: strong action verb + what you built or changed + specific quantified result.
Weak bullets (what to stop writing)
- ❌ Responsible for managing the payment processing pipeline
- ❌ Worked on improving system performance
- ❌ Helped the team deliver the Q3 product launch
- ❌ Collaborated with cross-functional stakeholders
- ❌ Managed a team of engineers
Strong bullets (what to write instead)
- ✓ Rebuilt the payment processing pipeline to support 3x transaction volume, reducing processing errors by 94% and saving $1.2M in annual chargebacks
- ✓ Optimized core API response time from 820ms to 140ms p95, enabling the product team to launch a real-time feature previously blocked by latency
- ✓ Led the Q3 product launch across 3 engineering teams (22 engineers), shipping 6 days ahead of schedule and capturing an estimated $4M in pipeline
- ✓ Drove cross-team alignment on API versioning standards adopted by 5 platform teams, cutting integration time for new services by 40%
- ✓ Built and led an 8-person backend team from scratch, growing from 0 to delivering $12M ARR product features within 14 months
ATS optimization — how to get past the filter
Approximately 75% of resumes are filtered out by ATS (Applicant Tracking Systems) before a human sees them. ATS systems scan for keyword density, formatting compatibility, and section recognition.
How to optimize for ATS step by step
- Paste the job description into a document
- Highlight every skill, tool, and requirement mentioned more than once
- Check your resume — does each highlighted term appear at least once?
- Add missing keywords in context (summary, bullets, skills section)
- Use exact phrasing from the job description, not synonyms
- Test by pasting your resume into a plain text file — can you read everything?
ATS formatting rules
- Use standard section headers: Work Experience, Education, Skills, Summary
- No tables, columns, or text boxes
- No headers or footers for key information
- No graphics, icons, or images
- No unusual fonts or font sizes below 10pt
- Submit as DOCX unless PDF is specifically requested
- Spell out abbreviations at least once: "Machine Learning (ML)"
Use Askia's ATS audit to check your resume for compatibility issues before applying. Run the audit →
Most common resume mistakes — by type
- Writing a job description instead of accomplishments. Listing what your role was responsible for instead of what you specifically achieved.
- No numbers. "Improved performance" and "reduced errors" are meaningless without scale. Always quantify — if you do not have exact numbers, approximate.
- Generic summary. "Results-driven professional with strong communication skills" describes everyone and no one. Your summary should name your domain, your level, and your direction.
- Too long or too short. One page for under 8 years; two pages for senior professionals. Packing everything in 10pt font is worse than cutting content.
- Wrong keyword language. Using "ML" when the job description says "machine learning," or "AWS" when it says "Amazon Web Services." ATS treats these as different terms.
- Inconsistent formatting. Mixed date formats, inconsistent use of periods at the end of bullets, different bullet styles — these signal carelessness.
- Missing LinkedIn URL. Recruiters check LinkedIn for every candidate. Make it easy — include the URL in your contact section.
- Not tailoring to the role. One resume for every application means you are probably underselling your fit for each one. At minimum, tailor your summary and top 3 bullets.
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