Reactjs Developer

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.

• Ability to understand business requirements and translate them into technical requirements
• Write, test, and release world-class, production-ready code
• Ensure that the data needs of the UI are fulfilled with efficient database queries
• Ensure compliance with software engineering standards and processes defined at Simform.
• Optimizing components for maximum performance across a vast array of web enabled devices and browsers

• Solid hands-on experience with ReactJS frontend development with modern practices. 
• HTML5, JavaScript, ES6, and TypeScript expertise
• Experience with   React .js / D3.js / GraphQL is a plus
• Proficiency with CSS3, Sass, and Mixins - knowledge of GSAP would be a plus
• Familiarity with RESTful APIs integration 
• Experience with common front-end development tools such as Babel, Webpack, NPM, Bower, Gulp etc. 
• Familiarity with code versioning tools such as Git, SVN, Github, Bitbucket

Job Description:

We are looking for a good 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. Therefore, a commitment to collaborative problem solving, sophisticated design, and quality product is important.

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:

• 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 (Redux)
• Familiarity with newer specifications of ECMAScript
• Experience with data structure libraries (e.g., Immutable.js)
• Knowledge of isomorphic React is a plus
• Familiarity with RESTful APIs
• Knowledge of modern authorization mechanisms, such as JSON Web Token
• Familiarity with modern front-end build pipelines and tools
• Ability to understand business requirements and translate them into technical requirements
• A knack for benchmarking and optimization
• Familiarity with code versioning tools (such as Git, SVN, and Mercurial)

• We are looking for an UI Developer with minimum 3 years of experience in (React.js and/or Angular.js) who is motivated to combine the art of design with the science of programming
• Candidates need to have expertise in user interface designing and developing great user experiences in web and mobile applications

Role :

• Design and development of data-driven, highly scalable web applications with a rich user interface
• The successful candidate will work closely with our Engineering team and bridge the gap between graphical design and technical implementation, taking an active role on both sides and defining how the application looks as well as how it works.

Responsibilities :

• Develop new user-facing features.
• Ensure the technical feasibility of UI/UX design.
• Build reusable code and libraries for future use.
• Optimize application for maximum speed and scalability.
• Assure all user input is validated before submitting it to the backend.

• Proficiency in HTML, CSS, Javascript, Bootstrap, JQuery and AJAX.
• Must have : jQuery, jQuery UI, AJAX, Subversion, JSON/XML, bootstrap, SASS, CSS, HTML, Angularjs or React Js
• Comfortable coding in server side languages (PHP, Python, Java, .net) that drive interface requirements/rendering
• Strong experience taking static images/prototypes and converting to web interfaces
• Experience with consuming JSON/XML data via JS frameworks
• Basic usage of Linux command line
• Understanding of server - side CSS
• Good understanding of Angular JS and/or React JS
• Must have knowledge of cross-browser development
• Experience with graphic design applications such as Adobe Illustrator/captivate
• Experience with responsive and adaptive design
• Utilizing a variety of mark - up languages to write web pages
• Understanding of SEO principles
• Proficient understanding of code versioning tools such as Git and BitBucket.

We are looking for a skilled react.js developer to join our front-end development team. In this role, you will be responsible for developing and implementing user interface components using React.js concepts. You will also be responsible for profiling and improving front-end performance and documenting our front-end codebase.

React.js Developer Responsibilities:

1. Reviewing application requirements and interface designs.
   
2. Identifying web-based user interactions.
   
3. Developing and implementing highly responsive user interface components using react concepts.
   
4. Writing application interface codes using JavaScript following react.js workflows.
   
5. Troubleshooting interface software and debugging application codes.
   
6. Developing and implementing front-end architecture to support user interface concepts.
   
7. Monitoring and improving front-end performance.
   
8. Documenting application changes and developing updates.
   

React.js Developer Requirements:

1. Previous experience working as a react.js developer.
   
2. In-depth knowledge of JavaScript, CSS, HTML, and front-end languages.
   
3. Knowledge of REACT tools including React.js, Webpack, Enzyme, Redux, and Flux.
   
4. Experience with user interface design.
   
5. Experience with browser-based debugging and performance testing software.
   
6. Excellent troubleshooting skills.
   
7. Good project management skills.
   

Requirements : 

a) CSS / Bootstrap : Flex Layout/ability to demonstrate the cascading nature of CSS clearly with example/Positioning.

b) Pure JavaScript: Prototype chain and inner workings of inheritance in JS. Understood DOM, Events, Event Bubbling, and Capturing/ ability to demonstrate it with example/ Promises and their use cases.

c) TypeScript: Basic understanding of using TS. Union Types, Index Signatures,

d) REST: Backend experience. REST principles, URL structures for APIs. integration using native JS (fetch and Promises) and in Angular. use cases of getting vs POST vs PUT vs PATCH.

e) Angular :  Abstractions of Angular Component, Service, Pipe, Directive, Module, Lifecycles. Knew advanced patterns as well Dynamic Components, Content Projection, Reactive Forms, ViewChild, ContentChild. Understood Observables and various operators demonstration of Design Skills ability to create the component and module hierarchy for a moderately complex application, along with their interactions

• Experience in developing modern web applications using React and Redux.
• Strong proficiency in CSS, JavaScript, including DOM manipulation and the JavaScript object model
• Good understanding of Database schema, design, optimization, scalability.
• Great communication skills, strong work ethic.
• Ownership of the product from start to finish.
• Ability to learn new technologies quickly.

• Experience with AWS
• Expert level understanding of the HTML DOM and underlying event model
• Prior Open source contributions
• Experience building responsive design.