Frontend Developer

React JS Developer

Job Summary

We are seeking a skilled React JS Developer to build and maintain high-quality, scalable, and responsive web applications. The ideal candidate should have strong experience with React.js, JavaScript, and modern front-end development practices. You will work closely with UI/UX designers, backend developers, and product teams to deliver exceptional user experiences.

Key Responsibilities

• Develop and maintain responsive web applications using React.js.
• Build reusable components and front-end libraries for future use.
• Translate UI/UX designs into high-quality, responsive code.
• Integrate RESTful APIs and third-party services.
• Optimize applications for maximum speed and scalability.
• Debug and resolve application issues and performance bottlenecks.
• Collaborate with cross-functional teams throughout the development lifecycle.
• Write clean, maintainable, and well-documented code.
• Participate in code reviews and follow best development practices.
• Stay updated with the latest front-end technologies and industry trends.

Required Skills

• Strong proficiency in JavaScript (ES6+), HTML5, and CSS3.
• Hands-on experience with React.js and React Hooks.
• Experience with Redux, Context API, or other state management libraries.
• Knowledge of REST APIs and JSON.
• Familiarity with Git and version control systems.
• Experience with responsive web design and cross-browser compatibility.
• Understanding of modern build tools such as Webpack, Vite, or Babel.
• Basic knowledge of Agile/Scrum methodologies.

Preferred Qualifications

• Bachelor's degree in Computer Science, Information Technology, or a related field.
• 2–5 years of experience in React.js development.
• Experience with TypeScript, Next.js, Material UI, or Tailwind CSS is an advantage.
• Knowledge of testing frameworks such as Jest or React Testing Library is a plus.
• Familiarity with CI/CD pipelines and cloud platforms is desirable.

Job Summary:

We are looking for an experienced Salesforce Commerce Cloud (B2C) Developer to join our growing e-Commerce team. The ideal candidate will have 2.6+ years of hands-on experience with Salesforce Commerce Cloud (SFCC), specifically with SFRA and/or PWA. Proficiency in front-end technologies such as React and JavaScript is essential. Experience with Node.js is a plus.

Key Responsibilities:

• Design, develop, and maintain scalable e-commerce solutions using Salesforce Commerce Cloud (SFCC B2C).
• Work with SFRA or PWA frameworks to build modern, responsive, and high-performance storefronts.
• Collaborate with cross-functional teams including designers, QA, and project managers to deliver robust e-commerce experiences.
• Develop and integrate front-end components using JavaScript and React.
• Troubleshoot issues, identify bottlenecks, and devise solutions for performance and scalability.
• Stay updated on emerging trends in e-commerce and SFCC best practices.

Required Skills & Qualifications:

• 2.5+ years of hands-on experience with Salesforce Commerce Cloud (B2C), preferably with SFRA/PWA.
• Strong proficiency in JavaScript and React.
• Understanding of e-Commerce platforms and business processes.
• Familiarity with web services (REST/SOAP), APIs, and integrations.
• Experience with version control systems like Git.
• Good communication and problem-solving skills.

Nice to Have:

• Experience with Node.js.
• Familiarity with CI/CD pipelines.
• Exposure to Agile/Scrum development methodology.

What you'll do:

· Perform complex application programming activities with an emphasis on mobile development: Angular, ionic, Node, TypeScript, JavaScript, Apache Cordova, RESTful APIs and more

· Assist in the definition of system architecture and detailed solution design that are scalable and extensible

· Collaborate with Product Owners, Designers, and other engineers on different permutations to find the best solution possible

· Own the quality of code and do your own testing. Automate feature testing and contribute UI testing framework

· Become a subject matter expert for our mobile applications

· Deliver amazing solutions to production that knock everyone’s socks off

· Mentor junior developers on the team

What we’re looking for:

· Amazing technical instincts. You know how to evaluate and choose the right technology and approach for the job. You have stories you could share about what problem you thought you were solving at first, but through testing and iteration, came to solve a much bigger and better problem that resulted in positive outcomes all-around.

· A love for learning. Technology is continually evolving around us, and you want to keep up to date to ensure we are using the right tech at the right time.

· A love for working in ambiguity—and making sense of it. You can take in a lot of disparate information and find common themes, recommend clear paths forward and iterate along the way. You don’t form an opinion and sell it as if it’s gospel; this is all about being flexible, agile, dependable, and responsive in the face of many moving parts.

· Confidence, not ego. You have an ability to collaborate with others and see all sides of the coin to come to the best solution for everyone.

· Flexible and willing to accept change in priorities, as necessary

Preferred Qualifications:

· Proficient with Apache Cordova framework

· Built or maintained custom Cordova plugin

· Demonstrable knowledge of native coding background in iOS

· Understanding of Apple certificate and profile management

· Experience developing and deploying applications within Kubernetes based containers

· Experience in Agile and SCRUM development techniques

About the Role

At Ceryneian, we’re building a next-generation, research-driven algorithmic trading platform aimed at democratizing access to hedge fund-grade financial analytics. Headquartered in California, Ceryneian is a fintech innovation company dedicated to empowering traders with sophisticated yet accessible tools for quantitative research, strategy development, and execution.

Our flagship platform is currently under development. As our Frontend / Full Stack Engineer, you’ll lead the creation of a stunning, intuitive user experience—spanning our landing page, drag-and-drop strategy builder, trading dashboards, and internal tools. You’ll collaborate closely with design, backend, and DevOps teams to build high-performance, secure, and scalable customer-facing applications. This role is central to delivering the reliability, flexibility, and performance our users will rely on in fast-moving financial markets.

We are a remote-first team and are open to hiring exceptional candidates globally.

Core Tasks

·      Design, build, and deploy customer-facing interfaces, including the strategy builder, dashboards, and marketplace.

·      Implement reusable UI components based on Figma designs; integrate charting tools like TradingView or Highcharts.

·      Own the frontend development pipeline, including prototyping, implementation, testing, and responsiveness.

·      Implement secure authentication and user management (OAuth2, JWT, multi-role access).

·      Build real-time web experiences using WebSockets, REST, and client-server integrations.

·      Collaborate with backend and DevOps teams to streamline data flow and deployment workflows.

Top Technical Competencies

·      Strong foundation in HTML/CSS, JavaScript/TypeScript.

·      Proficiency in modern frontend frameworks such as React (Next.js), Svelte, Angular, Vue, or Phoenix.

·      Experience with OAuth2 and secure authentication workflows.

·      Familiarity with server-side rendering (SSR) and modern state management (Zustand, Redux, MobX).

·      Integration experience with charting libraries such as TradingView, Recharts, or Highcharts.

·      Deployment experience using platforms like Vercel, Heroku, GCP, or AWS.

·      Working knowledge of WebSockets, REST APIs, and data streaming models.

·      0–3 years of frontend development experience.

Bonus Competencies

·      Familiarity with Supabase, PostgreSQL, Firebase, or MongoDB.

·      Understanding of microfrontend architectures or API Gateway patterns.

·      Experience with WebAssembly and real-time trading interfaces.

·      Exposure to fintech platforms or trading systems.

·      Background from Tier-I or Tier-II institutions with strong computer science fundamentals, a passion for scalable system design, and a drive to build cutting-edge fintech infrastructure.

Ideal Candidate

You’re a design-minded full stack engineer who builds fast, clean, and modular frontend systems. You thrive on making complex interfaces intuitive—turning strategy logic into drag-and-drop workflows—and can ship high-performance components that integrate seamlessly with real-time APIs. You value design systems, scalable frontends, and cross-functional collaboration.

What We Offer

·      Opportunity to shape the product interface of a next-gen fintech startup.

·      A collaborative, technically driven culture.

·      Competitive compensation with performance-based bonuses.

·      Flexible working hours and a remote-friendly environment.

·      Exposure to financial modeling, trading infrastructure, and real-time systems.

·      Collaboration with a world-class team from Pomona, UCLA, Harvey Mudd, and Claremont McKenna.

Job Description

Role:- Software engineer - front end

About the company:-We are a social learning platform that allows us to learn the way we learn best. If our children are going to learn online we will have to make it social. That’s how learning happens best. We think we’re amongst the first few companies in the world trying to push the boundaries of edtech to a new era of highly social & community driven learning.

 Responsibilities:-

You will be responsible for taking end-to-end ownership of the development of beautiful, fast, and responsive mobile and web applications. You will have attention to detail. You will care about the quality of code, design patterns and testability. You will be working closely with designers, product managers and engineers to build products that will delight our educators, students and parents.

HTML, CSS and JavaScript ninja
Patient debugging skills
Using state of the art developer toolkit
React JS / React Native / Vue.js
Curiosity to remain updated with the newest technologies and frameworks

•  6+ years of web UI development experience including 4+ years of deep, hands on experience in building robust, highly reusable and responsive web applications using HTML, CSS3, SVG, React, Redux, Thunk ecosystem
• Great problem-solving skills with solid data structures and algorithms knowledge
• Strong ability to translate the design/wireframes into reusable micro components
• Experience of leading, coaching and mentoring junior developers with good delegation and time-management skills
• Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model
• Thorough understanding of React.js and its core principles and has extensively worked with Redux, Thunk, Axios etc
• Knowledge of modern authorization mechanisms, such as JSON Web Token, Oauth2 etc
• Experience with common front-end development tools such as Babel, Webpack, NPM, etc.
• A knack for perfection, benchmarking and optimization
• Writing and maintaining batch jobs to streamline processes (Shell, Perl etc).
• Strong understanding of Agile and Lean software development processes and practices
• Worked with WebSocket, Push notifications etc
• Experience working with local-storage, cookies etc
• Proficient understanding of CORS issues and ways to work with such issues.
• Proficient understanding of social network APIs.
• Experience with data structure libraries (e.g., Immutable.js)
• Inclined to take ownership of tasks and to ship highly polished products with excellent attention to detail.
• Strong verbal and written communication skills in English.
• BE/BTech in Computer Science or a related field or equivalent practical experience

Responsibilities 

• Convert wireframes into rich interactive prototypes. 
• Work with backend development team to integrate front end code. 
• Understand business requirements and convert into functional specifications. 
• Participate in architecture and technical level discussions and takes initiative. 
• Passion for web design and eager to learn and implement the latest trends.
• A focus on delivering high-quality code through strong testing practices
• Working on Information architecture and Designing wireframes and prototypes.

Skills Required:

• 4+ years of commercial-grade web/front-end development experience.
• Strong experience in JavaScript, ideally ES6 or ES7, Node.js, building Single Page Web Applications with modern frameworks (Angular or AngularJS, React, Vue).
• 2+ years hands on experience with frameworks like react/relay/Redux/node.
• 2+ years with JS build tools like grunt,webpack,gulp etc.
• Knowledge in ES6, Webpack is a plus.
• Experience in creating web applications with delightful user experience.
• Experience working with REST APIs.
• Experience in TDD, Writing Clean & Readable code.
• Experience in Version control - Git.
• Awareness of cross-browser compatibility issues and client-side performance considerations 
• Experience in creating responsive pages and cross-browser support.
• Ability to clearly communicate thoughts and ideas by rapid prototyping.
• Debugging skills, familiar with debugging tools of all major browsers.

Nice to Have:

• Prior experience in Fintech Startups
• Knowledge of Node.js, Express js, AWS (EC2, S3, Elasticsearch)
• Knowledge and working experience with MongoDB, NOSQL

Crownstack is a premium organisation that specializes in providing innovative digital technology solutions to various enterprises including startups, small and medium-sized businesses and Fortune 500 companies across the globe. Our services include, but are not limited to, UI design, mobile app and web development, Cloud computing, data analytics, and Dev Ops. We take pride in our ingenious, meticulous, and skilled workforce who aim to deliver sustainable and cutting-edge business and technology solutions to all our clients. ★ 100+ Successful Apps Delivered | ★ Enterprise and Startup Clients | ★ Scalable Products | ★ MEAN Stack | ★ Python, pHp, NodeJs | ★ Agile Development | ★ Best UI/UX Award

Crownstack is looking for ReactJs Developers to join our team and deliver a streamlined user experience. We want a team member who strives to develop a first-class codebase using ReactJs best practices. As a React Developer, you will implement a complete user interface across our mobile and desktop web interfaces.

Job Location: Gurgaon/Noida

Experience: 2+ years  

Roles and Responsibilities

• Develop user interfaces with the latest frontend technologies
• Research, analyze, and develop product features of increasingly complex nature
• Code tested and documented JavaScript, HTML, PUG and CSS
• Make design and technical decisions for ReactJs projects.
• Develop application code and unit testing in the ReactJs with REST APIs
• Ensure high performance of all systems developed

Skills and Qualifications

• 2+ years experience with ReactJs
• Strong expertise with HTML, CSS, and writing cross-browser compatible code.
• Experienced in Typescript is a plus
• Familiarity with testing frameworks (Ex. Enzyme)
• Experience in building highly reusable and decoupled components
• Experience in State management Libraries like Redux, mobx
• Critical thinking and problem-solving skills
• Good time-management skills
• Great interpersonal and communication skills