CertClue
Courses · Software
Junior Front-End Developer

Junior Front-End Developer

Build a page to a spec that survives real content and real screens, work inside a component codebase, debug with devtools instead of guesswork, fix genuine accessibility defects, and use git and code review the way a team actually does.
6 hrs taught · 5.5 to 10 hrs applied 7 modules 29 lessons 6 portfolio artifacts Completion certificate Updated August 2026
Created by the CertClue team
What you'll build

Real portfolio pieces built during the course, not a certificate for its own sake. Each one is work you can show.

  • A responsive page built to a specOne page built against a written specification rather than invented as you go, deployed at a link somebody can open on a phone. No horizontal scroll from 320 pixels upward, correct at 200 percent zoom, fully keyboard operable, and still correct with content three times longer than the design showed.
  • A small reusable component setFour to six components built to the model rather than copied: inputs in, events out, no component fetching its own data, and every state handled including disabled, loading, error and empty. Plus one page that shows each component in every state at once.
  • A git history with real commit messagesThe history of that repository: one logical change per commit, summaries written as instructions, bodies that explain why where the reason is not obvious, and at least one merged pull request with a description covering what, why, how to test and what you checked.
  • An accessibility fix logOne page recording real defects you found in your own work: what was wrong, where, who it affects and what they experienced, how you found it, the specific fix, and how you verified it. The artifact that turns a claim about caring into evidence.
  • A code review responseEach review comment quoted, sorted into defect, convention, question or preference, with what you did about it and one sentence on what you took from it. Includes at least one comment you disagreed with and how that conversation resolved.
  • A decision logOne line per decision that was not yours alone to make: the ambiguity with the criteria quoted in their own words, why they cannot both hold, the resolutions you could see, what you recommended and the reason, and what was actually decided, by whom and on what date. Includes at least one decision that went against your recommendation.

What you'll learn

Fundamentals, kept short
The role decoded
A day in the role
The recurring calendar
Live simulation · a week at Northgate Books
Artifacts · the proof you leave with
Handoff · interviews, and the honest answer about certification

Course content · 7 modules, 29 lessons

Sign up to unlock every lesson - the titles below show exactly what is inside.

The durable half of front-end work: how the browser builds a page, semantic markup, the cascade and the box model, flex and grid, why layouts break, responsive design, the slice of JavaScript you will genuinely use, and the accessibility basics that are not optional.

How the browser builds a page
Semantic HTML and what it buys you
The cascade and the box model
Layout: flexbox and grid
Why layouts break
Responsive without magic numbers
The JavaScript you will actually write
Accessibility basics that are not optional

Requirements

  • No prior experience in this field is required to start.
  • A computer with a reliable internet connection.
  • Comfortable using a web browser - no software to install.

Description

Every CertClue course follows the same seven-part shape: fundamentals, the role translated out of job-posting language, a real working day, the job's recurring rhythms, a multi-day simulation, the portfolio you build along the way, and a handoff into your next move. Here is what that looks like for junior front-end developer.

Who this course is for

Anyone aiming to become a junior front-end developer, including career changers with no background in it yet. This is the entry rung of a realistic ladder:

entry
Junior Front-End Developer

Builds UI components from a design, and fixes bugs in an existing codebase.

Component buildingDebuggingResponsive layout
mid
Front-End Developer

Owns a full feature area, works directly with design on new patterns, and reviews code from other developers.

Feature ownershipDesign collaborationCode review
senior
Senior Front-End Engineer

Sets front-end architecture and standards across the product, and mentors other developers.

ArchitectureMentoringTechnical strategy
Reviews

No reviews yet. Reviews come from learners who have taken the course, so this stays empty until someone leaves one.

Sign in to leave a review.

Students also explore