CSS Developer Needed for Responsive Web Design and Styling

We're seeking an expert CSS Developer to create beautiful, responsive, and performant user interfaces with clean, maintainable CSS code that works flawlessly across all devices and browsers.

Key Responsibilities:

Write clean, semantic, and maintainable CSS

Create responsive layouts for all screen sizes

Convert design mockups (Figma, PSD) to pixel-perfect CSS

Implement CSS animations and transitions

Ensure cross-browser compatibility

Optimize CSS for performance

Use CSS preprocessors (Sass, LESS)

Implement CSS frameworks and methodologies

Debug CSS issues and fix layout problems

Create reusable CSS components

Maintain CSS documentation

Follow best practices and coding standards

Collaborate with designers and developers

Test on multiple devices and browsers

Required Skills:

3+ years of professional CSS development experience

Expert knowledge of CSS3 and modern features

Responsive design principles (mobile-first)

CSS preprocessors (Sass/SCSS, LESS)

Flexbox and CSS Grid mastery

Cross-browser compatibility expertise

CSS animations and transitions

BEM or other CSS methodologies

Version control with Git

Understanding of accessibility (WCAG)

Performance optimization

Design to code conversion skills

CSS Technologies:

Core CSS:

CSS3 Features:

Flexbox layout

CSS Grid layout

Custom properties (CSS variables)

Media queries

Pseudo-classes and pseudo-elements

CSS transitions

CSS animations (@keyframes)

CSS transforms (2D and 3D)

CSS filters

CSS gradients

CSS shadows (box-shadow, text-shadow)

CSS blend modes

CSS Preprocessors:

Sass/SCSS:

Variables

Nesting

Mixins

Functions

Partials and imports

Extend/inheritance

Operators

Control directives (if/else, loops)

LESS:

Variables

Mixins

Nesting

Operations

Functions

PostCSS:

Autoprefixer

CSS optimization

Future CSS features

Custom plugins

CSS Frameworks:

Utility-First:

Tailwind CSS

Tachyons

Component-Based:

Bootstrap 5

Foundation

Bulma

Material UI (CSS version)

Materialize

CSS-in-JS (Basic knowledge):

Styled Components

Emotion

CSS Modules

CSS Methodologies:

BEM (Block Element Modifier):

.block {}

.block__element {}

.block--modifier {}

Naming convention

Component-based thinking

Reusability

Scalability

SMACSS (Scalable and Modular Architecture):

Base rules

Layout rules

Module rules

State rules

Theme rules

OOCSS (Object-Oriented CSS):

Separate structure from skin

Separate container from content

Reusable objects

ITCSS (Inverted Triangle CSS):

Settings

Tools

Generic

Elements

Objects

Components

Utilities

Atomic CSS:

Single-purpose classes

Utility-first approach

Maximum reusability

Responsive Design:

Mobile-First Approach:

Start with mobile styles

Progressive enhancement

Min-width media queries

Touch-friendly interfaces

Mobile performance optimization

Breakpoints:

/* Mobile first */

/* Base styles: 0-575px */

/* Small devices (landscape phones, 576px and up) */

@media (min-width: 576px) {}

/* Medium devices (tablets, 768px and up) */

@media (min-width: 768px) {}

/* Large devices (desktops, 992px and up) */

@media (min-width: 992px) {}

/* Extra large devices (large desktops, 1200px and up) */

@media (min-width: 1200px) {}

Responsive Techniques:

Fluid layouts (percentages, viewport units)

Flexible images (max-width: 100%)

CSS Grid responsive layouts

Flexbox responsive patterns

Container queries (modern)

Responsive typography (clamp, vw units)

Media queries for features (hover, orientation)

Layout Techniques:

Flexbox:

Flex containers and items

Flex direction (row, column)

Justify-content (alignment)

Align-items and align-self

Flex-wrap

Flex-grow, flex-shrink, flex-basis

Gap property

Common patterns (centering, equal heights, navigation)

CSS Grid:

Grid containers and items

Grid template columns/rows

Grid gaps

Grid areas (named areas)

Grid auto-flow

Minmax function

Repeat function

Fr unit

Auto-fit and auto-fill

Grid alignment

Complex layouts

Positioning:

Static, relative, absolute, fixed, sticky

Z-index and stacking contexts

Centering techniques

Overlays and modals

Float Layouts (Legacy):

Float and clear

Clearfix technique

Column layouts

CSS Animations:

Transitions:

.element {

  transition: all 0.3s ease-in-out;

}

Transition properties

Transition duration

Transition timing functions

Transition delay

Hover effects

Smooth interactions

Keyframe Animations:

@keyframes slidein {

  from { transform: translateX(-100%); }

  to { transform: translateX(0); }

}

Animation name

Animation duration

Animation timing function

Animation delay

Animation iteration count

Animation direction

Animation fill mode

Complex animations

Transform Effects:

Translate (move)

Scale (resize)

Rotate

Skew

3D transforms

Transform origin

Perspective

Advanced CSS Techniques:

CSS Variables (Custom Properties):

:root {

  --primary-color: #007bff;

  --spacing: 16px;

}

.element {

  color: var(--primary-color);

  margin: var(--spacing);

}

Define and use variables

Theming

Dynamic values

JavaScript integration

CSS Functions:

calc() - calculations

clamp() - responsive sizing

min(), max()

var() - variables

attr() - attribute values

url() - images/fonts

rgb(), hsl() - colors

CSS Shapes:

clip-path

shape-outside

Polygons and circles

Custom shapes

CSS Filters:

Blur

Brightness

Contrast

Grayscale

Hue-rotate

Invert

Opacity

Saturate

Sepia

Drop-shadow

Pseudo-Classes:

:hover, :focus, :active

:nth-child, :nth-of-type

:first-child, :last-child

:not()

:is(), :where()

:has() (modern)

:checked, :disabled

:empty

Pseudo-Elements:

::before, ::after

::first-letter, ::first-line

Cross-Browser Compatibility:

Browser Testing:

Chrome

Firefox

Safari

Edge

Mobile browsers (iOS Safari, Chrome Mobile)

Legacy browser support (if needed)

Vendor Prefixes:

.element {

  -webkit-transform: rotate(45deg);

  -moz-transform: rotate(45deg);

  -ms-transform: rotate(45deg);

  transform: rotate(45deg);

}

Use Autoprefixer (automated)

Fallbacks for older browsers

Feature detection

CSS Reset/Normalize:

Reset CSS (Eric Meyer)

Normalize.css

Custom resets

Box-sizing: border-box

Performance Optimization:

CSS Performance:

Minimize CSS file size

Remove unused CSS (PurgeCSS)

Combine CSS files

Minification

Compression (gzip)

Critical CSS inline

Defer non-critical CSS

Use CSS containment

Avoid expensive selectors

Rendering Performance:

Avoid layout thrashing

Use transform over position

GPU acceleration (will-change)

Optimize animations

Reduce repaints and reflows

Efficient selectors

Accessibility:

WCAG Compliance:

Color contrast ratios (4.5:1 minimum)

Focus indicators

Keyboard navigation styles

Screen reader considerations

Skip links

Reduced motion (prefers-reduced-motion)

High contrast mode support

Semantic HTML with CSS:

Proper heading hierarchy

ARIA-friendly styling

Visible focus states

Touch target sizes (44x44px minimum)

Print Styles:

@media print {

  /* Print-specific styles */

}

Page breaks

Hide unnecessary elements

Optimize for printing

Black and white optimization

Dark Mode:

@media (prefers-color-scheme: dark) {

  /* Dark mode styles */

}

Dark theme implementation

Color scheme preference

Toggle implementation

Theme switching

CSS Architecture:

File Organization:

styles/

├── base/

│ ├── reset.scss

│ ├── typography.scss

│ └── variables.scss

├── components/

│ ├── buttons.scss

│ ├── cards.scss

│ └── forms.scss

├── layout/

│ ├── header.scss

│ ├── footer.scss

│ └── grid.scss

├── pages/

│ ├── home.scss

│ └── about.scss

└── utilities/

    ├── mixins.scss

    └── helpers.scss

Naming Conventions:

Consistent naming

Descriptive class names

Avoid IDs for styling

Lowercase with hyphens

Component-based names

CSS Specificity:

Understanding specificity rules

Avoid !important

Keep specificity low

Use classes over IDs

Design Implementation:

Design to Code:

Pixel-perfect implementation

Extract colors and fonts

Measure spacing and sizes

Implement hover states

Match design system

Responsive breakpoints

Design Tools:

Figma (inspect mode)

Adobe XD

Sketch

Zeplin

InVision

Typography:

Font-family stacks

Web fonts (@font-face, Google Fonts)

Font sizes and scales

Line height (1.5 for body text)

Letter spacing

Font weights

Responsive typography

Web font optimization

Common Layouts:

Navigation:

Horizontal menus

Dropdown menus

Mega menus

Mobile hamburger menus

Sticky navigation

Sidebar navigation

Cards:

Card components

Image cards

Flip cards

Hover effects

Card grids

Forms:

Form layouts

Input styling

Form validation styles

Placeholder styling

Focus states

Error states

Modals:

Modal overlays

Modal positioning

Modal animations

Accessible modals

Hero Sections:

Full-screen heroes

Background images/videos

Overlay effects

Call-to-action buttons

CSS Best Practices:

Code Quality:

Consistent formatting

Proper indentation

Comments for complex code

DRY (Don't Repeat Yourself)

Single responsibility

Modular code

Maintainability:

Organized structure

Clear naming

Documentation

Version control

Code reviews

Consistent patterns

Tools & Workflow:

Development Tools:

Browser DevTools (Chrome, Firefox)

VS Code extensions (IntelliSense, Prettier)

Live reload (Browsersync)

CSS linting (Stylelint)

Build Tools:

Webpack

Gulp

npm scripts

Sass compiler

PostCSS

Testing:

Visual regression testing

Responsive testing

Browser compatibility testing

Accessibility testing

Performance testing

Deliverables:

Clean, organized CSS files

Responsive layouts (all breakpoints)

Cross-browser compatible code

Pixel-perfect design implementation

Animations and transitions

Documentation and comments

Source files (Sass/SCSS if used)

Compiled CSS (minified and unminified)

Browser support documentation

Style guide (if applicable)

1-2 rounds of revisions included

Budget: $30 - $65/hour or $1,500 - $5,000 (Fixed project depending on complexity)

Timeline: 1-4 weeks (depending on scope)