A mid-level frontend developer at a growth-stage SaaS company starts the day in Slack, scanning design handoffs from Figma and open PRs. Mornings are typically deep UI work — implementing a redesigned settings page, debugging a Safari-specific flex bug, or fixing a hydration mismatch in Next.js. PR reviews are continuous; most FE teams expect a reviewer to turn around a 100-line diff within an hour. Afternoons bring design sync with the UX team, a perf review of last week's Lighthouse deltas, and a working session with a backend engineer to negotiate an API contract. Before a release, the engineer runs Playwright E2E suites, checks Core Web Vitals in staging (LCP, INP, CLS), and steps through axe-core a11y reports. When a design calls for a new motion pattern, the engineer prototypes in CodePen or Framer Motion before committing. Junior frontend devs spend more time pair-programming and completing well-scoped tickets. Seniors own component libraries, performance budgets, and cross-team accessibility standards. Staff-level frontend engineers set org-wide web-quality direction and advise platform teams on rendering-model choices (SSR vs SSG vs CSR vs ISR).

No measurable performance work

In 2026, frontend engineering is performance engineering at scale. A resume without any Core Web Vitals mention (LCP, INP, CLS), bundle-size reduction, or Lighthouse-score improvement reads as 'hasn't owned production impact.' INP officially replaced FID on March 12, 2024 with a ≤200ms 'good' threshold — hiring managers expect candidates to name it. Resume signal: at least one bullet with a concrete before/after perf metric (e.g., 'LCP 3.8s → 0.9s via image optimization + critical CSS').

Accessibility as afterthought

AudioEye tracked 4,000+ ADA Title III digital-accessibility lawsuits filed in 2024, up 37% in California alone. Companies — especially e-commerce and B2C SaaS — now gate hires on a11y awareness as a legal-risk baseline. A resume with zero mention of WCAG 2.2 AA, axe-core/Lighthouse a11y audits, keyboard navigation, screen-reader testing, or ARIA signals risk. Include at least one bullet touching accessibility scope (violations remediated, audit score, compliance level achieved).

Tool-dump skills list without depth

Listing 'Bootstrap, Tailwind, styled-components, Sass, Less, CSS Modules, Emotion, Stitches, vanilla-extract' signals breadth without depth. Recruiters and hiring managers read a sprawling CSS/state/framework stack as 'knows none deeply.' Keep 2–3 approaches per category (CSS, state, testing), each tied to a concrete project bullet. Same rule for state libraries — pick Redux Toolkit OR Zustand OR React Query as your primary, not all three simultaneously.

"Built components" with no scope or outcome

The most common pattern in rejected FE resumes (Robert Half, Toptal, r/webdev synthesis): bullets like 'built React components' or 'used Redux for state' that tell recruiters nothing about scope, scale, or result. The strong version names what you built, how many, for whom, and what changed. Every bullet should include ≥1 metric (components, teams adopting, DAU, conversion) OR ≥1 concrete outcome (launched X, shipped to N teams, reduced Y by Z%). Drop 'responsible for' entirely.

1Ignoring Core Web Vitals entirely

In 2026, frontend engineering is performance engineering. Core Web Vitals (LCP, INP, CLS) are now real SEO and conversion levers — INP replaced FID officially on March 12, 2024. A resume with zero mention of Lighthouse scores, bundle sizes, or perf-metric improvements signals 'hasn't owned production outcomes.' Include at least one bullet with a concrete before/after perf number.

2No mention of accessibility

AudioEye tracked 4,000+ ADA Title III digital-accessibility lawsuits in 2024 — companies now gate hires on a11y awareness. Even one bullet mentioning WCAG 2.2 AA, axe-core audits, keyboard navigation, or screen-reader QA shows you understand modern frontend responsibilities. Absence of any accessibility signal reads as legal-risk to compliance-conscious hiring teams.

3Listing every CSS framework you've touched

Writing 'Bootstrap, Tailwind, styled-components, Sass, Less, CSS Modules, Emotion, Stitches, vanilla-extract' signals breadth without depth. Pick the 2–3 you've used most extensively and demonstrate proficiency through bullet points that show real projects and outcomes. Same rule for state libraries (Redux vs Zustand vs React Query — pick your primary).

4Treating frontend as 'just HTML/CSS/JS'

Modern frontend roles require knowledge of build tools (Vite, Webpack, Turbopack), testing strategies (RTL + Playwright), CI/CD integration, API design, server-side rendering, and streaming/suspense patterns. A resume that only shows markup and styling skills gets filtered out for mid-level and senior positions.

5Generic bullets without scope or metrics

'Built React components' and 'used Redux for state' tell recruiters nothing. Every bullet should answer: what did you build, how many, for whom, and what changed as a result? Use at least one metric (users, load, adoption, perf delta) or concrete outcome (launched X, shipped Y to N teams) per line. Drop 'responsible for' phrasing entirely.

6Missing portfolio or live work links

Frontend is one of the only engineering disciplines where a live demo of your craft is directly possible — and recruiters know it. A portfolio site, a deployed side project, a polished Storybook published to Chromatic, or a meaningful merged PR to a well-known OSS project consistently outperforms an extra year of coursework-flavored experience. Include links in your resume header.

7ATS-hostile formatting

Two-column layouts, tables, icons, embedded images, and header/footer-only contact info routinely fail ATS parsers. Stick to a single-column resume with standard section headings (Experience, Education, Skills) exported as PDF from a docx source. Save creativity for your portfolio site, not the screening artifact.