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Front End Developer, Sr.

Sundayy

seniorpermanentfrontend United States 16 days ago via LinkedIn

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Tags

ReactTypeScriptJavaScriptReduxRedux ToolkitHTML5CSS3REST APIsWebSocketsFinancial Technology

About the role

Role Overview

Senior Front-End Developer (Sr.) working on financial web applications. You will build and maintain front-end components that improve usability, responsiveness, and visual quality.

Responsibilities

  • Design and develop responsive, visually appealing web interfaces
  • Collaborate with back-end developers, UI/UX designers, and product managers to deliver high-quality integrations
  • Implement new features and improvements for existing products
  • Review, optimize, and refactor front-end code for performance, maintainability, and scalability
  • Help build new products from scratch with innovative technical ideas
  • Test front-end components to meet functional and non-functional requirements
  • Ensure cross-browser and cross-platform compatibility
  • Maintain documentation and share knowledge with the team
  • Identify, troubleshoot, and resolve front-end issues promptly
  • Stay current with front-end technologies and best practices

Requirements

  • 3 to 6 years of modern front-end development experience
  • Strong understanding of the full SDLC
  • Proficiency in HTML5, CSS3, and JavaScript (ES6+)
  • Experience with TypeScript
  • Hands-on experience with React.js
  • Familiarity with Redux and Redux Toolkit
  • Experience with styled-components and immutability libraries (e.g., Immer)
  • Practical knowledge of RESTful APIs and WebSocket APIs; familiarity with JSON/XML data formats
  • Experience with front-end testing frameworks and methodologies
  • Understanding of UI/UX principles and design thinking
  • Familiarity with modern development tools, build systems, deployment, and monitoring
  • Basic familiarity with jQuery and Bootstrap (for legacy code support/migration)
  • Strong communication skills and ability to work both independently and in a team

Nice to Have

  • UI/UX and design thinking depth
  • Legacy migration experience (jQuery/Bootstrap)

About Sundayy

Esprow (listed in the posting as Esprow and Sundayy) is a financial technology company providing testing, certification, and simulation solutions for financial trading platforms. Its Esprow Enterprise Testing Platform (ETP) supports automated testing and validation to help ensure reliability and compliance for financial institutions worldwide.

Scraped 7/9/2026