Middle/Senior React Developer - part time

Your mission

As a Frontend Engineer at Index, you will primarily focus on building and optimizing high-quality, performant, and SEO-friendly web applications using React and Next.js. You will work closely with product, design, and marketing teams to ensure excellent user experience, strong Core Web Vitals, and reliable analytics and tracking.

This role is ideal for a strong mid-level frontend engineer who takes ownership of UI quality and performance and is motivated to gradually expand into backend development (Ruby on Rails and Python) with mentorship and support.

Key Responsibilities

Frontend Development (React / Next.js)

• Build and maintain React and Next.js components, pages, and application logic.

• Implement responsive, accessible, and SEO-optimized UI using modern CSS approaches.

• Troubleshoot and fix bugs in the existing frontend codebase.

• Identify and resolve frontend performance issues (code splitting, memoization, lazy loading).

• Monitor and optimize Core Web Vitals in collaboration with product and marketing teams.

• Ensure smooth and reliable integration with backend APIs.
  
  

SEO, Analytics & Tracking

• Implement and maintain technical SEO best practices, including:

  • Meta tags and structured metadata

  • Schema markup

  • Sitemap and robots.txt management

  • Core Web Vitals optimization

• Implement and manage Google Tag Manager (GTM) setups, including tags, triggers, and variables.

• Support analytics and conversion tracking integrations (GA4, Meta Pixel, etc.).

• Collaborate with marketing on tracking requirements and data layer implementation.

• Debug, QA, and validate analytics and tracking across public-facing pages.
  
  

Accessibility & Quality

• Apply accessibility best practices for public-facing pages.

• Ensure compliance with WCAG accessibility standards.

• Write clean, readable, and maintainable frontend code.

• Participate in code reviews and contribute to improving frontend standards and patterns.

Backend Exposure & Growth (Nice to Have / Learning Path)

• Collaborate with backend engineers to understand API design and data flows.

• Gradually contribute to backend tasks using Ruby on Rails and/or Python as part of personal growth.

• Learn how frontend decisions impact backend performance and system design.

Tech Stack

Frontend

• Next.js, React.js, TypeScript

• Tailwind CSS, Shadcn, Radix UI

• Framer Motion

Backend (Learning / Exposure)

• Ruby on Rails, Ruby, Python

Infrastructure & Tooling

• Git, Webpack

• PostgreSQL, Redis (exposure)

• Docker (basic understanding)

Testing

• Jest

Workflow & Communication

• Agile methodology

• Atlassian Jira, Bitbucket

• Slack, Google Meet

Your Profile

Required

• Strong knowledge of HTML5, CSS3, JavaScript (ES6+), and TypeScript.

• Solid hands-on experience with React.js and modern frontend development.

• Experience with Next.js or other SSR/SSG frameworks.

• Strong understanding of technical SEO principles and best practices.

• Experience with performance optimization and Core Web Vitals.

• Familiarity with Tailwind CSS (and/or SASS, Bootstrap).

• Experience with unit testing using Jest.

• Good understanding of Git and modern build tools (e.g., Webpack).

• Ability to work independently with good self-organization skills.

Nice to Have

• Desire to learn backend development (Ruby on Rails and/or Python).

• Basic understanding of REST APIs and backend concepts.

• Knowledge of Feature-Sliced Design (FSD).

• Experience with Framer Motion or animation libraries.

• Familiarity with Formik and Yup.

• Curiosity about system design and platform architecture.

What We Offer

• A frontend-focused role with clear ownership and impact.

• Close collaboration with product, design, and marketing teams.

• Real influence over performance, SEO, and analytics quality.

• A supported path toward backend development for those who want it.

• A modern tech stack and agile working environment.

• A culture that values quality, autonomy, and continuous learning.

Your profile

• Strong knowledge in HTML5, CSS3, JavaScript ES6/7, Typescript
• ReactJS
• SASS, bootstrap, tailwindcss
• Unit testing with Jest
• Git, Webpack
• Independence, good self-organisation, analytical thinking
• Beneficial knowledge:
  - Feature Sliced Design (FSD) architecture knowledge
  - Framer-motion or any animation lib
  - Formik & yup
  - Rollup.