

Integrate and extend Python REST APIs and create visually stunning UI experiences for analysts and
users.
Create flexible dashboards and reports (using plotly, d3, etc) and leverage open source technology to
create various components.
Create a flexible UI for data analytics and big data usecases which can be used by Large Tier banks as
well as smallscale agile startups
Write unit tests and functional tests for the component using tools like Jasmine, Karma, Cypress, etc.
Follow software development practices with continuous testing, development and integration (CD/CI)
Write and maintain technical design documents and new-feature documents
Collaborate closely with developers, engineers, testers, and product managers
Participate in peer-based code reviews and design reviews
Follow agile methodology and encourage collaboration with tools such as GIT, Confluence and Slack
applications

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WHO YOU ARE
To be successful in this role, you’ll need to have the following skills:
- Love for coding: A fanatic about writing beautiful and scalable code.
- Sense of analytics: Strong analytical and troubleshooting skills. Should be resourceful, innovative and inventive.
- Dynamic: Should be comfortable in dealing with lots of moving pieces. Have exquisite attention to detail, and are comfortable learning new technologies and systems.
- Team player: Knack for influencing without being authoritative. Pitch in wherever the team needs help, from writing blog posts to supporting customers.
- Accountability: High sense of ownership for your code and relentlessness to deliver projects with high business impact.
KEY QUALIFICATIONS
- BE/BTech in Computer Science or related field.
- Minimum 3+ years of UI/Frontend development and a strong understanding of building complex layouts using JavaScript, CSS and HTML.
KEY SKILLS
- Strong computer system analysis and design skills in current methodologies and patterns including vanilla JavaScript, some experience with ReactJS, Redux, React Native, Webpack, and Typescript or similar library/tools.
- Obsessed with WPO (Web Performance Optimization) and web/mobile performance analysis.
- Experienced with web standards and protocols such as HTTP, DNS, TCP/IP, and socket APIs in general.

- Develop new user-facing features
- Build reusable code and libraries for future use
- Ensure the technical feasibility of UI designs
- Optimize application for maximum speed and scalability
- Assure that all user input is validated before submitting to the back-end
- Collaborate with other team members and stakeholders
- Should have hands-on experience in advanced JavaScript libraries and frameworks, such as AngularJS, KnockoutJS, Bootstrap, BackboneJS, ReactJS, DurandalJS, etc. (ReactJS is Mandatory)
- Proficient in web markup, including HTML5, CSS3
- Good understanding of server-side CSS pre-processing platforms, such as LESS and SASS, and experience in building/using REST APIs
- Proficient understanding of client-side scripting and JavaScript frameworks, including jQuery
- Good understanding of asynchronous request handling and partial page updates.



• Strong understanding of GUI architecture, site navigation and web design principles, and the ability to create and maintain web pages quickly and efficiently
• Extensive web programming experience including web security, cross browser compatibility, and performance tuning
• Development experience in the area of: Responsive design/development and mobile device applications and optimized Web sites
• Hands on design & development skills in HTML/XHTML, HTML5, CSS2, CSS3
• Knowledge of W3C standards, Web accessibility
• Hands on experience with Object oriented JavaScript and Design Patterns
• Extensive experience in at least one of the modern frameworks like jQuery / jQueryUI / Angular JS / ExtJS / Ember JS / Backbone JS / React / TypeScript
The Company is looking for a Front End Developer to join our growing team in our
Costa Rica office. Your experience here will give you the opportunity to improve the
fundamentals and learn about the top-notch technologies in front end development. If you are
someone who is passionate about building stellar user experiences and great products through elegant code this would be the job for you. You will play a key role in translating our customers and company needs into appealing and functional web pages while proving your ideas with testing. We all work closely together across teams so there's no red tape or
bureaucracy. We get things done!
What You Will Get to Do
● Work with your team to improve our conversion rates by coding out variations for A/B testing
● Build better user experiences
● Rigorously educate yourself with the latest development techniques and best practices
● Proactively anticipate issues and develop solutions
● Clearly communicate solutions to team members both verbally and in writing documentation
● Implement new digital technologies or development techniques that help to meet business
objectives
What You Bring to the Table
● 3+ years of front-end development experience
● Experience with responsive web design and the ability to deliver outstanding functionality
to the range of client devices from desktops and laptops to mobile platforms
● Familiarity with at least one JavaScript framework (MVW) and know when to do without
one when necessary.
● Understanding of HTTP and how clients interact with a web server.
● Solid understanding of best practices. You read the YDKJS books.
● Capable of coding in ES5 and ES6 and understand the difference between them
● Up-to-date on HTML5 and CSS3 features.

Job Description
We are looking for an expert JavaScript developer who is skilled with Vue.js or ( Angular or React latest). Your primary focus will be developing user-facing web applications and components. You’ll implement them with the Vue.js framework, following generally accepted practices and workflows. You will ensure that you produce robust, secure, modular, and maintainable code. You will coordinate with other team members, including back-end developers and UX/UI designers. Your commitment to team collaboration, perfect communication, and a quality product is crucial.
Responsibilities
- Developing user-facing applications using Vue.js
- Building modular and reusable components and libraries, Optimizing your application for performance
- Designing features and applications for mobile and multiple screen sizes
- Implementing automated testing integrated into development and maintenance workflows
- Staying up-to-date with all recent developments in the JavaScript and Vue.js space
- Creating prototypes for testing for functionality testing
Skills
- Highly proficient with the JavaScript language and its modern ES6+ syntax and features
- Highly proficient with Vue.js framework and its core principles such as components, reactivity, and the virtual DOM
- Familiarity with the Vue.js ecosystem or any other latest versions fronted js like Angular and react
- Good understanding of HTML5 and CSS3, including SASS, SCSS
- Understanding of server-side rendering and its benefits and use cases
- Knowledge of functional programming and object-oriented programming paradigms
- Ability to write efficient, secure, well-documented, and clean JavaScript code
- Familiarity with automated JavaScript testing
- Proficiency with modern development tools, like Git
- Experience with both consuming and designing RESTful APIs
Experience
- 4+ Years of experience in UI development role in product based organization.
- Should possess experience in handling a team of developers.
ROLE REQUIREMENTS
- Expertise level knowledge of HTML5 : Comprehensive knowledge of tags, HTML API (Geo, Storage, More APIs), Canvas APIs, META Tags and Semantic markup
- Expertise level knowledge of CSS3 : CSS Object Model, Selectors & Hierarchy, Layouts, Responsive Designs, Build Tools, SASS / SCSS & Flexbox
- Expertise level knowledge of ES6: Object-Oriented programming principles, DOM Selectors, Event Handlers, Jquery - Functions, Callbacks, Promises, Debugging tools & approach
- Experience in creating build scripts from scratch using Webpack & Gulp with relevant plugins to improve DevOps
- Ability to independently create technical design of an Epic utilising the knowledge of JavaScript design patterns and CSS best practices
- Experience in reviewing the technical design and implementation of other frontend team members
- Ability to Suggest better alternatives to existing solutions for improving the solution quality (both functional and non-functional problems)
- Ability to coach and line-manage senior frontend engineers, to help them grow their career
- Experience in Typescript and contemporary FE development frameworks like ReactJS, Angular & VueJS is preferred
QUALIFICATIONS & CHARACTERISTICS
- 8+ years of industry experience.
- Analytic and positive mindset with a personable and professional approach.
- Sharp attention to detail and a passion for new technology.
- Professional written and verbal communication.

- Make good engaging user interface
- Integrate apis and make it functional
- Writing tested and documented JS, HTML and CSS
- Perform product analysis and development tasks of increasingly complex nature which may require extensive research and analysis.
- Make design and technical decisions for REACT-JS projects.
- Ensuring high performance

We do have opening with our company Crownstack Technologies for React.Js Developer. Interested candidate can share their CV.
About us
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
Job Description
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.
Requirements
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

Technical Skills
- Ensure the technical feasibility of UI/UX designs
- Optimize application for maximum speed and scalability
- Assure that all user input is validated before submitting to back-end
- Use markup languages like HTML to create user-friendly web pages
- Design mobile-based features
- Collaborate with back-end developers and web designers to improve usability
- Maintain and improve website
- Develop new user-facing features
- Build reusable code and libraries for future use
- Optimize applications for maximum speed
- Get feedback from, and build solutions for, users and customers
- Write functional requirement documents and guides
- Create quality mockups and prototypes
Preferred
- Proven work experience of 2+ years as a Front-end developer
- 1+ years experience of working in ReactJS
- Hands on experience with markup languages, including HTML5, CSS3
- Experience with JavaScript, CSS and jQuery
- Good understanding of asynchronous request handling, partial page updates, and AJAX
- Familiarity with browser testing and debugging
- In-depth understanding of the entire web development process (design, development and deployment)
- Understanding of layout aesthetics
- Knowledge of SEO principles
- Familiarity with software like Adobe Suite, Photoshop and content management systems





