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Gui Developer Jobs in Ontario (NOW HIRING)

Citigroup Inc.

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 ...

Citi

Senior Java Developer

Mississauga, ON

CA$94K - CA$141K/yr

Demonstrated experience with modern GUI technologies (e.g., Angular, React, Vue.js) and associated ... Bachelor's or Master's degree in Computer Science, Engineering, or a related field. Preferred ...

Citi

Senior Java Developer

Mississauga, ON

CA$94K - CA$141K/yr

Demonstrated experience with modern GUI technologies (e.g., Angular, React, Vue.js) and associated ... Bachelor's or Master's degree in Computer Science, Engineering, or a related field. Preferred ...

Pleora

Software Developer

Kanata, ON

CA$80K - CA$120K/yr

... Software Developer in the R&D team, working on projects in embedded/machine vision, IoT, and ... Working with the UXD team to design front end GUI interfaces that connect to our devices * Research ...

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Gui Developer information

What is a GUI developer?

A GUI Developer is responsible for designing and implementing user interfaces for software applications, ensuring a seamless and visually appealing user experience. They use front-end technologies like HTML, CSS, JavaScript, and frameworks such as React or Angular to build interactive components. Their role involves collaborating with UX designers, back-end developers, and other stakeholders to create responsive, efficient, and user-friendly interfaces.

What does a GUI developer do?

A typical day for a GUI Developer involves designing, coding, and testing user interfaces, collaborating closely with UX/UI designers to ensure layouts are both functional and visually engaging. You will work as part of a multidisciplinary development team, often participating in daily stand-ups, code reviews, and feedback sessions with backend developers and product managers. GUI Developers may also engage in troubleshooting and optimizing interface performance, as well as adapting designs based on user feedback or evolving project goals. Effective teamwork and communication are key, as your work directly impacts how end-users interact with the final product.

What are the key skills and qualifications needed to thrive in the GUI developer position?

To thrive as a GUI Developer, you need strong programming skills in languages such as JavaScript, HTML, CSS, and familiarity with frameworks like React, Angular, or Qt, often supported by a degree in computer science or related field. Experience with design tools (e.g., Adobe XD, Figma) and an understanding of user interface guidelines are typically required, and certifications in front-end development can be advantageous. Creativity, attention to detail, and effective communication are vital soft skills that help bridge the gap between design and functionality. These abilities are important to create intuitive, visually appealing, and user-friendly interfaces that enhance the overall user experience.

What are popular job titles related to Gui Developer jobs in Ontario?

For Gui Developer jobs in Ontario, the most frequently searched job titles are:

What job categories do people searching Gui Developer jobs in Ontario look for?

The top searched job categories for Gui Developer jobs in Ontario are:

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For Gui Developer jobs in ON, the most frequently searched job titles are:

Gui Developer jobs near you
Infographic showing various Gui Developer job openings in Ontario as of August 2026, with employment types broken down into 81% Full Time, 7% Part Time, and 12% Contract. Highlights an 81% Physical, 5% Hybrid, and 14% Remote job distribution.

Senior GUI developer - Equities Technology

Citigroup Inc.

On-site

Full-time

This job post has expired today. Applications are no longer accepted.

Citibank rating

8.4

Company rating: 8.4 out of 10

Based on 179 frontline employees who took The Breakroom Quiz

38th of 173 rated banks

Job description

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 opportunity, review Accessibility at Citi.

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

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What Citibank employees say

Pay

Benefits

Hours and flexibility

Workplace

Get the full story on Breakroom

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About Citigroup Inc

Sourced by ZipRecruiter

We live in an increasingly complex world. Companies these days are either born global or are going global at record speed. Business and geopolitics are forging an entirely new dynamic and consumers now expect financial services to be a seamless part of their digital lives. Citi is a bank that’s uniquely positioned for this moment. Through our vast global network and our on-the-ground expertise, we can connect the dots, anticipate change and empathize the needs of our clients and customers in ways that other banks simply cannot. Citi's mission is to serve as a trusted partner to our clients by responsibly providing financial services that enable growth and economic progress. We have set expectations for how we must act to bring our mission to life. These expectations are at the heart of our Leadership Principles – we take ownership, we deliver with pride and we succeed together.

Industry

Banking and credit intermediation

Company size

5,001 - 10,000 Employees

Headquarters location

New York City, NY, US

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