Many resumes fail not because candidates lack skill, but because presentation hides value. Recruiters make quick judgments, and small editorial mistakes can make strong experience appear weaker than it is.
The first major issue is generic language. Phrases like "responsible for" or "worked on" provide activity but no impact. Replace them with achievement-led bullets that explain what changed because of your contribution.
The second issue is structural inconsistency: mismatched date formats, uneven spacing, inconsistent punctuation, and mixed tense usage. These details seem minor, but collectively they signal low polish and weak attention to detail.
The third issue is unclear positioning. If your top section does not quickly communicate role fit, the rest of your resume may never be read carefully. Your headline and lead bullets should make the case immediately.
The fourth issue is over-optimization for ATS. Repeating keywords unnaturally or dumping long skill lists can trigger skepticism. Relevance should come from contextualized achievements, not mechanical repetition.
Treat your final review like an editor would: verify numbers, confirm chronology, check tense consistency, scan for clarity, and read for flow. A technically correct resume that is hard to scan still loses interviews.