React.js Developer

The Opportunity At Certa, we are building the AI-native Operating System for global enterprise relationships. We have the clients (Fortune 100/500) and the robust backend technology. Now, under the guidance of our new Head of Design, we are elevating our experience to match the best consumer products in the world. We are looking for our First Design Engineer. You are the "missing link" between our pragmatic engineering requirements and our ambitious design vision. You won't just implement tickets; you will define how our product feels.

The Role This is not a standard Frontend Engineer role, nor is it a Product Designer role. This role is equal parts: Craft-focused Frontend Engineering: You write production-grade code, but you obsess over the details that others miss. Systems Thinking: You don't just build components; you build the architecture (Design System) that allows the rest of the team to build beautiful UI faster. Figma-to-Code Mastery: You bridge the gap between static Figma files and dynamic browser realities, moving fluidly between design and implementation.

What You Will Do

1. Architect the Design System & UI Patterns Take ownership of our internal design system. You will treat it as an internal product, creating a type-safe, accessible, and composable library in React & TypeScript. Manage the tokens, components, patterns, documentation, and governance required to scale design across a remote engineering team. Bridge the gap between Figma Variables/Tokens and code, ensuring a single source of truth for our visual language.
2. Make AI-Native UX Feel Trustworthy & Human Implement interaction patterns specifically for AI workflows: streaming states, progressive disclosure, and optimistic UI. Build for "explainability" and human-in-the-loop controls, ensuring users trust the system even when it automates complex tasks. Make complexity feel simple—especially when the system is performing sophisticated "smart" operations in the background.
3. Maximize Output with AI-Assisted Tooling Hyper-automate the mundane: Use AI coding assistants (Cursor, Copilot, etc.) to handle boilerplate and scaffolding, allowing you to spend 80% of your time on the 20% of the "feel" and "craft." Build tooling and guardrails (linting rules, visual checks, component playground workflows) that help the team ship high-fidelity UI consistently.
4. Bridge Design & Code (Figma-First) Live in Figma: You are expected to be as comfortable in Figma as you are in VS Code. You’ll tweak layouts, design missing states, and refine prototypes yourself. Push performance beyond just metrics: focus on rendering, bundle size, perceived speed, and interaction responsiveness. Raise the bar on accessibility and cross-browser behavior, ensuring the product is usable by everyone.

Must Haves

1. Expert Figma Skills: This is a primary requirement. You should be fluent in auto-layout, components, variables, and prototyping. You view Figma as a design environment and a technical spec.
2. AI-Assisted Workflow: You are a "power user" of AI tools (Cursor, Copilot, v0, etc.). You know how to leverage AI to move faster without sacrificing the quality of the final output.
3. Strong Frontend Foundation: Deep expertise in React + TypeScript with a track record of shipping complex, data-heavy UIs in production.
4. Demonstrated UI Craft: A portfolio showing obsession with spacing, typography, interaction detail, and motion. You likely have a "Folder of Inspiration" from the best apps in the world.
5. Design System Experience: Strong experience building and maintaining a design system: tokens, components, patterns, and documentation.
6. Accessibility Expertise: You build keyboard-first UX, understand screen reader behavior, and enforce correct ARIA usage by default.
7. Modern Tooling: Experience with Vite and modern frontend tooling; comfortable setting up and customizing JS tooling/build systems.

Why You? (The "Craft" Factor)

1. You are inspired by the design-engineering cultures of companies like Linear, Vercel, Family, or Arc (The Browser Company).
2. You get annoyed when a modal closes without an exit animation.
3. You understand that latency is a UX problem, and you use optimistic UI updates to make the app feel instant.
4. You believe enterprise software doesn't have to look like a spreadsheet from 2005—it should feel as fluid as the best consumer apps.
5. You are an "AI-augmented" engineer who uses modern tools to do the work of three people while maintaining the taste of an artisan.

Responsibilities:

• Be a key player in the entire application development lifecycle, build and maintain excellent react applications with clean code
• Formulating an effective process to implement pixel-perfect UI's that match designs.
• Generating front-end libraries and reusable components for later use. 
• Maximizing performance of components across a wide range of web-capable devices and browsers Skills.
• Working in collaboration with the team members and project managers to develop clean, modern, smooth animations and transitions that provide an excellent user experience.
• Create and maintain workflow with the team for implementing and integrating the third-party APIs and work along with the backend team.
• Flexible in working with a small team of frontend-backend developers, a project manager, and other programmers.
• Liaise with the internal team to produce top-notch prototypes and mock-ups.
• Participating in concepts of new programs, products, or features by monitoring industry development trends and assisting team members for development.
• An understanding of common programming paradigms and fundamental React principles, similar as React components, hooks, and the React lifecycle.
• Discussing and implementing new project management ideas with team and problem-solving skills to overcome obstacles.
• Keep abreast with day to day developments in technology and working with native modules.
• Assist with building estimates and assume accountability for your job and results delivery.
  

Requirements:

• Bachelor’s or Master’s degree in computer science, computer applications or related fields.
• Proven working experience as a React Developer for 3+ years and above.
• Hands-on experience on  HTML5, CSS3, and  CSS frameworks.
• Demonstrable knowledge on  Web services, Web API, REST services & GraphQL.
• Expertise in UI design and development of responsive web applications using React, Redux, Flask and Hooks.
• Applicable knowledge on Social API integration, Core location APIs, Web Views, Payments integration
• Proficiency in understanding of layout aesthetics .
• Excellent analytical, problem-solving and multitasking skills.
• Ability to solve novel and challenging React problems.
• Capability to understand ,develop and sustain continuous integration and delivery.

React.js, HTML5, CSS3, Javascript
Client side scripting
Experience in responsive design, PWA, asynchronous request handling, complex front end displays like flowchart, graphs etc.
Knowledge of JSON/XML
Knowledge of Web Fundamentals, Browser Working, REST API
State Management with Redux
Latest APIs of HTML5

We are looking for a great JavaScript developer who is proficient with React.js. Your primary focus will be on developing user interface components and implementing them following well-known React.js workflows (such as Flux or Redux). You will ensure that these components and the overall application are robust and easy to maintain. You will coordinate with the rest of the team working on different layers of the infrastructure.

Responsibilities:

• Developing new user-facing features using React.js
• Building reusable components and front-end libraries for future use
• Translating designs and wireframes into high quality code
• Optimizing components for maximum performance across a vast array of web-capable devices and browsers.

Skills:

• Familiarity with RESTful APIs
• Familiarity with modern front-end build pipelines and tools
• Experience with popular React.js workflows (such as Flux or Redux)

We are looking to hire an experienced Frontend Developer with a very good grasp over Javascript and the capability to make responsive pages.
The candidate should have good knowledge of:
- Javascript 
- HTML & CSS

- Node js
- PWA 
- Electron JS platform.
- API Integration
Candidates having good logical skills are preferred.

What we're looking for 

AdPushup is an award-winning ad revenue optimization platform and Google Certified Publishing Partner (GCPP), helping hundreds of web publishers grow their revenue using cutting-edge technology, premium demand partnerships, and proven ad ops expertise. Our team is a mix of engineers, marketers, product evangelists, and customer success specialists, united by a common goal of helping publishers succeed. We have a work culture that values expertise, ownership, and a collaborative spirit. 

Your Day-to-Day Tasks Include: 

Ship product, independently and/or as part of a small team 

Collaborate with other engineers to build new features 

Debugging using dev consoles, firebug, firecookie, or any of your favorite tools. Help troubleshoot production issues and resolve critical customer facing issues Provide top-notch support to our customers 

You Should Have: 

3+ years of experience with React. 

A strong body of prior front end work, including significant projects written in React and Redux. Mastery of JavaScript; expertise in most of the following technologies, and proficiency in all of them: CSS3, HTML5, AJAX. 

Deep understanding of closures, prototypal inheritance, HTTP, web security, cross browser compatibility challenges. 

Experience with NodeJS and Express JS will be a plus 

Hands-on with a code management system like GIT, SVN. 

Experience with NoSQL databases, preferably CouchDB or CouchBase. 

Good to have: Experience with Typescript.