2025 median annual pay
$134,040
Median for the whole occupation, across all experience levels. It is not specific to a level or to Brazil.
Career in 2026 and 2027
Frontend Engineer
A Frontend Engineer builds the part of a product people actually touch, turning designs and APIs into interfaces that are fast, accessible and safe. The craft grows from writing correct pages, to owning application architecture and quality, to shaping how the browser itself is used at scale.
Content reviewed on October 20, 2026
- Levels
- 4
- Skills mapped at Mid-level
- 10
What each level must prove
Mid-level
Owns features end to end in the browser, from data and state to performance, security and tests.
You take a feature from a vague request to production without hand-holding, choosing how state flows, how it is tested and what it costs the user in load time. Compared with a junior, you are trusted with the decisions behind the screen and not only the screen itself.
Average score required: 70%
Browser APIs & Storage
Why: Lets you cancel a stale search request with AbortController or persist a draft in storage, instead of showing outdated results or losing the user's work on refresh.
Web Security (CORS/CSP/XSS)
Why: Lets you render user-supplied content and call another origin without opening an XSS hole or a CORS error that blocks the release.
Component Design Patterns
Why: Lets you extract hooks and compound components so a second team can reuse a feature you built, instead of forking it and drifting apart.
State Management Strategies
Why: Lets you decide what belongs in local state, the URL or a server cache, so a filter survives a page reload and the same data is not fetched in three places.
Core Web Vitals (LCP/CLS/INP)
Why: Lets you read a field report showing a slow LCP or layout shift on real phones and trace it to a specific image or late-loading banner.
Bundle Optimization & Code Splitting
Why: Lets you find why the first load grew after a new dependency and fix it with route-level code splitting, instead of shipping the whole app to every visitor.
Unit Testing (Jest/Vitest)
Why: Lets you cover a date formatter or price calculation with fast tests, so a refactor of that utility fails in CI before it reaches a customer invoice.
Component Testing (Testing Library)
Why: Lets you test a form the way a user uses it, by label and role, so a harmless markup change does not break the suite while a real regression still does.
Build Tools (Vite/Webpack)
Why: Lets you fix a build that works locally but fails in CI, or tame a slow dev server, because you understand what the bundler and its env variables do.
TypeScript in Frontend
Why: Lets you type props and API responses so a backend field rename shows up as a compile error in your editor instead of a blank screen in production.
Study for Frontend Engineer: trails and practice exams
Each level of this career maps to a study trail. Read the full topic map for free, then measure your level.
Market snapshot (United States)
Projected job growth, 2025–2035
+10%
Much faster than average
US occupation used: Software Developers, Quality Assurance Analysts, and Testers. US Bureau of Labor Statistics, Occupational Outlook Handbook, updated August 27, 2026
Two ways to move up one level
12 weeks · intensive
For whoever has a deadline
About 8 hours a week, in 1 cycle focused on the gaps that weigh most.
40 weeks · regular
Alongside work
About 4 hours a week, in 3 cycles. Each cycle carries what was left from the previous one.
Frequently asked questions
What is Frontend Engineer?
A Frontend Engineer builds the part of a product people actually touch, turning designs and APIs into interfaces that are fast, accessible and safe. The craft grows from writing correct pages, to owning application architecture and quality, to shaping how the browser itself is used at scale.
What must each level of Frontend Engineer prove?
Frontend Engineer is mapped in 4 levels: Junior, Mid-level, Senior, and Expert. Open each level above to see the skills it must prove.
How long does the Frontend Engineer plan take?
The plan has 2 paces: 12 weeks per level at about 8 hours a week (intensive) and 40 weeks per level at about 4 hours a week (regular).
How the plan works
AI tutor
A study session on each new topic, at your level.
AI school
Hands-on lessons on using AI in your career's daily work.
Assessments
Each requirement is proven by measurement, not by a checkbox.
Stage review
At the end of each cycle you see what moved and what carries over.
Find out which level you are at
A short diagnostic measures the skills you already have. The journey starts from there.