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 the 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 of experience in React, Redux, websockets and cutting‑edge web technologies. The candidate should be able to work independently as well as being a team player, with good communication skills and stakeholder 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 that 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, implementing functionality without direct supervision.
Work closely with teams to form a good working culture and continuously adapt to different working environments.
Requirements Hands on HTML5, CSS3/SASS/JS-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, WebSockets, Web Workers
Build Tools like Webpack/Vite, etc.
Debugging skills, code performance, benchmarking
Container‑based development like Electron
RESTful APIs, JWT, Node.js, 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.
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 chance, review Accessibility at Citi.
View Citi’s EEO Policy Statement and the Know Your Rights poster.

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📌 Senior GUI developer - Equities Technology (Ontario)
🏢 Citigroup
📍 Ontario