React.js Developer

Are you a UI whiz with a knack for crafting beautiful and intuitive interfaces? Do you love the

challenge of building cross-platform apps with cutting-edge technologies? If so, we want you on our

team!

About the Role:

We're seeking a talented and passionate Software Engineer with a deep understanding of

JavaScript, React, and Flutter to join our fast-growing team. You'll play a key role in designing,

developing, and implementing user interfaces for our web and mobile applications. You'll collaborate

closely with designers, product managers, and backend engineers to bring our vision to life and

create exceptional user experiences.

Responsibilities:

- Design and develop user interfaces (UI) using JavaScript, React, and Flutter

- Build reusable, maintainable, and performant UI components

- Implement responsive layouts that adapt seamlessly across different devices (web, mobile)

- Integrate UI components with backend APIs

- Write clean, well-documented, and testable code

- Collaborate with designers to translate design mockups into functional UIs

- Participate in code reviews and knowledge sharing

- Stay up-to-date on the latest UI development trends and technologies

Qualifications:

- 3+ years of experience as a software engineer with a focus on UI development

- Proficiency in JavaScript, including ES6+ features

- In-depth knowledge of React and experience building React applications

- Solid understanding of Flutter and experience building cross-platform mobile apps

- Experience with UI design principles (user experience, accessibility)

- Familiarity with CSS frameworks (e.g., Bootstrap, Material-UI) a plus

- Experience with state management libraries (e.g., Redux, MobX) a plus

- Experience with unit testing frameworks (e.g., Jest) a plus

- Excellent problem-solving and analytical skills

- Strong communication and collaboration skills

- Ability to work independently and as part of a team

Bonus Points:

- Experience with UI animation libraries (e.g., React Spring, Rive)

- Experience with continuous integration/delivery (CI/CD) pipelines

- Experience with accessibility best practices

- Experience with version control systems (e.g., Git)

Role Overview

We’re hiring a Senior Frontend Engineer with 5+ years of experience to build high-performance, scalable, and visually refined web applications. This is a hands-on engineering role focused on architecture, performance, and crafting exceptional user experiences across modern browsers and devices.

You will work closely with design, product, and backend teams to build robust frontend systems, define engineering standards, and ship production-grade features that scale.

What You’ll Build

1. Frontend Architecture & Development

• Build scalable, modular frontend applications using modern JavaScript frameworks
• Architect component-driven UI systems and reusable design libraries
• Implement robust state management and data flow patterns
• Develop responsive, cross-browser experiences with high usability
• Collaborate with backend teams to design API contracts and integrations

2. Performance & Optimization

• Optimize applications for speed, scalability, and accessibility
• Improve Core Web Vitals and page load performance
• Implement code splitting, lazy loading, caching, and asset optimization
• Diagnose and resolve performance bottlenecks in production environments
• Ensure smooth user experiences across low-end to high-end devices

3. UI Engineering & Design Systems

• Build and maintain scalable design systems and component libraries
• Translate Figma or design specifications into pixel-perfect interfaces
• Implement accessibility standards (WCAG) and responsive layouts
• Maintain visual consistency across products and platforms

4. Frontend Platform & Tooling

• Improve build systems, CI/CD pipelines, and developer tooling
• Implement testing strategies including unit, integration, and end-to-end testing
• Establish coding standards, linting rules, and documentation practices
• Support deployment workflows and release management

5. Collaboration & Leadership

• Mentor junior engineers and conduct technical reviews
• Work with product and UX teams to shape user-facing features
• Contribute to technical decision-making and roadmap planning
• Advocate for performance, maintainability, and user-centric design

Technical Stack

Frontend

• JavaScript / TypeScript
• React, Next.js (or similar modern frameworks)
• HTML5, CSS3, Tailwind or CSS Modules
• State management libraries such as Redux, Zustand, or similar

Tooling & Platforms

• Webpack, Vite, Rollup
• Git-based workflows
• Testing frameworks such as Jest, Cypress, Playwright
• REST APIs and GraphQL

Performance & Quality

• Chrome DevTools and performance profiling
• Accessibility tools and audits
• CI/CD pipelines and monitoring tools

What We’re Looking For

Must-Haves

• 5+ years of experience in frontend engineering
• Strong expertise in JavaScript or TypeScript and modern frameworks
• Experience building scalable frontend architecture from scratch
• Deep understanding of browser rendering, performance, and optimization
• Strong grasp of responsive design and accessibility best practices
• Experience integrating APIs and working closely with backend teams
• Ability to write clean, maintainable, and production-ready code

Highly Desirable

• Experience building design systems or UI platforms
• Familiarity with SSR or SSG and performance-driven architectures
• Experience with micro-frontends or large-scale frontend systems
• Exposure to cloud deployment workflows and frontend observability
• Product-focused mindset with strong UX understanding

Technical Challenges You’ll Tackle

• Scaling frontend architecture for complex applications
• Maintaining performance across devices and network conditions
• Designing reusable UI systems across multiple products
• Improving developer productivity and build pipelines
• Ensuring accessibility and usability at scale

Why Join Ctruh

• Work on product-focused engineering, not just UI implementation
• Build systems that directly impact customer experience and engagement
• Ownership of architecture, performance, and engineering standards
• Small, high-caliber engineering team with strong technical depth
• Freedom to experiment and influence product direction

Location & Work Culture

• Work from office: HSR Layout, Bengaluru
• 6-day work week (5 days in office, Saturdays work-from-home)
• High-performance engineering culture
• Fast decision-making environment with strong ownership mindset

Ideal Candidate Profile

• You think in systems, not just components. You care about performance, scalability, and user experience equally.
• You have built production-grade frontend applications, improved engineering standards, and mentored teams.
• You write maintainable code, challenge assumptions, and take ownership of the user journey end-to-end.

What We’re Looking for in You:

1. Qualifications: Bachelor’s Degree in Computer Science, Information Technology, or a related field

2. Certifications: NA

3. The Experience That Sets You Apart:

● Lead the development of responsive, pixel-perfect web interfaces using HTML, CSS, and JavaScript.

● Set and maintain frontend coding standards, structure, and best practices

● Collaborate with designers to bring UI/UX concepts to life with clean, maintainable code. ● Optimize web pages for performance, SEO, and cross-browser/device compatibility.

● Guide and mentor junior developers through code reviews and technical support.

● Own project timelines, quality assurance, and delivery for all frontend initiatives

4. Your Subject Matter Expertise:

● Team leadership — 2+ years leading 10+ member teams

● Strong communicator — aligns tech and non-tech teams

● Detail-driven — ensures UI and code precision

● Collaborative — fosters teamwork and mentorship

● Organized — manages time and parallel tasks efficiently

● Service-based mindset — experience in ~200-employee setups

● Composed under pressure — delivers in fast-paced environments

● Solution-focused — navigates challenges with clarity

• Develop Websites in React JS

• Use the best architecture suited for the project
• Familiar with state management
• Integrate API & SDKs
• Covert design to code
• Knowledge of typescript is a plus
• Write clean, structured code
• Should have good experience in Redux / Next

Role : React JS Developer 

• 1-4 years of experience as a React JS developer. 
• Must have Working Experience in a product based organization at least 18 months.
• Good Communication skills must. 
• Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model 
• Thorough understanding of React.js and its core principles 
• Experience with popular React.js workflows (such as Flux or Redux) ● Familiarity with newer specifications of ECMAScript
• Experience with HTML,CSS, Bootstrap and UI Design 
• Knowledge of RESTful APIs 
• Knowledge of modern authorization mechanisms, such as JSON Web Token ● Familiarity with modern front-end build pipelines and tools 
• Experience with common front-end development tools such as Babel, Webpack, NPM, etc. 
• Ability to understand business requirements and translate them into technical requirements 
• Familiarity with code versioning tools {such as Git} 

Senior Software Engineer, Frontend

https://www.alivecor.com/">AliveCor, the pioneer of the smartphone EKG, with millions of EKGs from a large and growing user base, seeks a Senior Software Engineer (Front-end Applications) to contribute to the Applications team. You will be an integral member of our engineering team, responsible for developing industry-leading web applications that transform the healthcare industry and affect the way consumers use, engage, and act on their health data.

• Passionate about User Experience.
• Has great verbal and written communication skills to engage directly with your peers.
• Understands and is thoughtful about engineering trade-offs
• Experience building web applications with cross-browser support and RESTful API integrations
• Commitment to delivering results.
• Passionate about continuous improvement.

• B.E in Computer Science or a related discipline, or related practical experience.
• 5-8 years of Frontend development experience with at least 2 years working as a React.js Developer.
• A strong grasp of software engineering and web application development fundamentals, including JavaScript (ES5, ES6), HTML and CSS.
• Aptitude to learn new technologies (e.g. ES.Next).
• Excellent troubleshooting skills.
• Familiarity with RESTful APIs to connect the Front-end applications to backend service
• Bonus points for:
• Publicly available web applications, portfolios, or examples available on a source repository (e.g. GitHub, GitLab, Bitbucket)
• An interest in data visualizations using JavaScript libraries such as D3, Highcharts, and others
• Experience managing front end tooling (e.g. gulp, grunt, webpack, post-CSS, service workers)
• Experience with performance analysis and tuning of web application
• Experience developing back end server APIs and/or server-side rendering

AliveCor is on a mission to define modern healthcare through data, design and disruption. We’ve pioneered the creation of FDA-cleared machine-learning techniques, transformed wearable medtech to put proactive heart care at everyone’s fingertips. Kardia is the most clinically validated mobile EKG technology. AliveCor was named as one of the Top 10 Most Innovative Companies in Health for 2017 by Fast Company as part of the publication’s annual ranking of the world’s Most Innovative Companies. AliveCor was awarded the 2015 Tech Pioneer by the World Economic Forum and one of the 50 Smartest Companies in 2015 by the MIT Technology Review. AliveCor recently announced a collaboration with Mayo Clinic that will result in new machine learning capabilities to unlock previously hidden health indicators in EKG data, potentially improving heart health as well as overall health care for a variety of conditions. AliveCor is a privately held company headquartered in Mountain View, CA.

AliveCor is an equal opportunity employer and will not discriminate against any employee or applicant on the basis of age, colour, disability, gender, national origin, race, religion, sexual orientation, or any other classification protected by federal, state, or local law.

Watch the following video demonstrating our product.

https://www.youtube.com/watch?v=8I9xosgA-Ig">KardiaMobile: How's your heart?
https://www.youtube.com/watch?v=8I9xosgA-Ig