Senior GUI developer - Equities Technology

Citi; New York (NY); Hybrid; USD 120,800 - 170,800; Full time

Job summary

Citi Equities Technology is seeking a Senior GUI developer to design and build front-end solutions for trading desks, improving efficiency and reducing risk.

You will collaborate with front office and product teams, deliver React/TypeScript apps, manage state with Redux, and ensure strong test coverage with Jest and React Testing Library; hybrid work in Mississauga, Canada.

Qualifications

• 6-10 years of experience in React and front-end web technologies.
• Strong analytical and communication skills with ability to manage stakeholders.
• Experience collaborating with front office, product development and development teams.

Responsibilities

• Design, develop and maintain web apps using React and TypeScript.
• Manage application state using Redux and middleware such as Redux Toolkit.
• Ensure high test coverage by writing unit tests with Jest.
• Write and maintain a suite of reusable UI components used across feature apps.
• Contribute to overall application architecture and front-end best practices.
• Perform code reviews and improve quality, maintainability and testability.
• Plan and schedule own work with minimal supervision.
• Collaborate with teams to foster a productive working environment.

Skills

HTML5

CSS/SASS

JavaScript

TypeScript

React

React hooks

Jest

React Testing Library

Redux

Redux Toolkit

Education

Bachelor’s degree

Tools

Webpack

Vite

Electron

NodeJS

Job description

Senior GUI developer - Equities Technology

Job Req Id:

26981136

Location(s):

Mississauga, Ontario, Canada

Job Type:

Hybrid

Posted:

Jul. 21, 2026

Discover your future at Citi

Working at Citi is far more than just a job. A career with us means joining a team of approximately 219,000 dedicated people from around the globe. At Citi, you’ll have the opportunity to grow your career, give back to your community and make a real impact.

Job Overview

This role is for a Senior GUI developer in Citi Equities Technology. As a senior developer you will work together with front office, product development and members of development team to provide solutions that improve efficiency, decrease operational risk, and enable the business to expand.

The candidate should possess strong analytical and technical ability with 6-10 years' experience in React, Redux, websockets and cutting-edge web technologies. Candidate should be able to work independently as well as being a team player, with good communication skills and stake holder management.

Responsibilities:

• Design, develop and maintain web apps using React and TypeScript, ensuring high quality, clean and maintainable code.
• Manage application state using redux and middleware such as redux toolkit.
• Ensure high test coverage by writing unit tests using Vitest.
• Write and maintain a suite of reusable UI components which can be used across different feature apps.
• Contribute to the overall application architecture and provide inputs on front end frameworks, design patterns and best practices.
• Perform code reviews and contribute to overall quality, maintainability and testability of software developed.
• Be a self-starter and plan/schedule own work for tasks and projects, implement functionality without direct supervision.
• Work closely with teams to form good working culture and continuously adapt to different working environment.

Requirements:

• Hands on HTML5, CSS3/SASS/CSS in JS, Core JavaScript, Typescript
• Hands on React, React hooks
• Unit Testing with Jest, React-testing-library
• Application State Management with Redux, Recoil, React Context
• Reactive Apps with RxJS, Web Sockets, Web workers
• Build Tools like Webpack/Vite etc
• Debugging skills, Code performance, Bench Marking
• Container based development like Electron
• RESTful APIs, JWT, NodeJS, Express JS

Nice to have:

• Exposure to Bitbucket, Jenkins, Artifactory, Confluence
• MongoDB, AMPS Server - should be able to query
• Workspace tools – npm workspace, Micro Frontend, ESLint/TSLint
• Docker management, Openshift containers
• Experience working with other UI frameworks such as Angular

Education:

• Bachelor’s degree/University degree or equivalent experience

This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.

This job opening is for an existing job vacancy.

Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.

If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi.

View Citi’s EEO Policy Statement and the Know Your Rights poster.

Job Family Group:

Technology

Job Family:

Applications Development

Time Type:

Full time

Primary Location Full Time Salary Range:

$120,800.00 - $170,800.00

Most Relevant Skills

Please see the requirements listed above.

Other Relevant Skills

For complementary skills, please see above and/or contact the recruiter.

Automated Processing and AI

We use automated processing, including artificial intelligence, for our legitimate business interests (or our reasonable and appropriate business purposes) to identify and align the candidate's skills and abilities with a specific job opening. Additionally, if you so choose, or consent, we can match your skills and abilities to other suitable roles at Citi.

Importantly, all our hiring processes and decisions, including determining your suitability for a role, are conducted, checked, and decided by individuals. Our automated processing and AI do not involve relying on automatic or autonomous decision-making. Please refer to any Jurisdictional Considerations, with specific provisions for your country (where relevant) for further details.