Senior Front-end Developer (.NET/C#)

Citi; Toronto; On-site; CAD 134,000 - 201,000; Full time

Job summary

Citi is seeking a Senior Front-end Developer to own the UI for a trade processing platform across Fixed Income, Markets Treasury, and Finance lines. You will work with .NET/C#, modern UI frameworks, and React to deliver scalable enterprise-grade web apps.

You will collaborate with cross-functional teams and senior stakeholders to ensure compliant, well-tested UI solutions, with a strong emphasis on automated testing and design standards.

Qualifications

• 5+ years in UI or full-stack development with a front-end emphasis.
• Mandatory proficiency in .NET and C#, with experience building enterprise-grade apps.
• Proficiency in React; Angular experience is a plus.
• Solid HTML5, CSS3, and JavaScript skills.
• Experience with test frameworks and automated testing practices.
• Knowledge of TypeScript is preferred.
• Experience with JSON/XML and REST APIs.
• Background in financial services or capital markets is advantageous.
• Familiarity with Security Financing Transactions or similar instruments is beneficial.
• Strong self-motivation and ability to work independently.

Responsibilities

• Design and deliver front-end web applications for a trade processing platform across Fixed Income and Markets Treasury.
• Take primary ownership of the UI development lifecycle from requirements through post-deployment support.
• Migrate legacy Citi UI components to React-based HTML5 interfaces using Citi design components.
• Ensure front-end development includes automated testing and clean design standards.
• Monitor and control all phases of development: analysis, design, construction, testing, implementation.
• Contribute to IT planning, time/cost estimates, and risk analysis for the application.
• Analyze complex tech problems and provide sound recommendations.
• Advise on security measures during post-implementation reviews.
• Collaborate with business users and cross-functional teams to resolve technical issues.
• Define operating standards and mentor junior analysts and team members.
• Ensure compliance with laws, regulations, and Citi policies.

Skills

Front-end engineering

.NET/C#

React

HTML5/CSS3/JS

TypeScript

REST/JSON APIs

Financial services experience

Security financing knowledge

Independent problem solver

Education

Bachelor's degree in Computer Science or related field

Tools

React

Angular

Job description

About Citi:

Citi, the leading global bank, has approximately 200 million customer accounts and does business in more than 160 countries and jurisdictions. Citi provides consumers, corporations, governments, and institutions with a broad range of financial products and services, including consumer banking and credit, corporate and investment banking, securities brokerage, transaction services, and wealth management.

As a bank with a brain and a soul, Citi creates economic value that is systemically responsible and in our clients’ best interests. As a financial institution that touches every region of the world and every sector that shapes your daily life, our Operations & Technology teams are charged with a mission that rivals any large tech company. Our technology solutions are the foundations of everything we do from keeping the bank safe, managing global resources, and providing the technical tools our workers need to be successful to designing our digital architecture and ensuring our platforms provide a first‑class customer experience. We reimagine client and partner experiences to deliver excellence through secure, reliable, and efficient services.

Our commitment to diversity includes a workforce that represents the clients we serve from all walks of life, backgrounds, and origins. We foster an environment where the best people want to work. We value and demand respect for others, promote individuals based on merit, and ensure opportunities for personal development are widely available to all. Ideal candidates are innovators with well‑rounded backgrounds who bring their authentic selves to work and complement our culture of delivering results with pride. If you are a problem solver who seeks passion in your work, come join us. We’ll enable growth and progress together.

The Role:

We are seeking a Senior Front-end Developer to join the Markets Technology division where they will take primary ownership of the front-end development of a trade processing application supporting Security Financing Transactions across Fixed Income, Markets Treasury, and Finance business lines. This is a full-stack-capable role with a heavy front-end emphasis, requiring deep proficiency in .NET/C# alongside modern UI frameworks particularly React. The ideal candidate will bring 5+ years of hands‑on experience building and modernizing enterprise‑grade web applications, with a strong preference for those who have worked in financial services or capital markets environments. You will operate as a subject matter expert collaborating closely with cross‑functional technology teams and senior stakeholders to deliver scalable, compliant, and well‑tested UI solutions.

Responsibilities

• Design and deliver front‑end web applications for a trade processing platform supporting Security Financing Transactions across Fixed Income and Markets Treasury business lines.


• Take primary ownership of the UI development lifecycle, from requirements gathering through implementation and post‑deployment support.


• Migrate and transform legacy Citi UI components into React‑based HTML5 interfaces using standard Citi design components.


• Ensure all front‑end development is delivered with fully automated testing and adherence to good design standards throughout.


• Monitor and control all phases of the development process, including analysis, design, construction, testing, and implementation.


• Conduct feasibility studies, produce time and cost estimates, and contribute to IT planning activities relevant to the application.


• Analyze complex technology problems, evaluate business and system processes against industry standards, and provide sound technical recommendations.


• Recommend and implement security measures as part of post‑implementation reviews to ensure successful system design and functionality.


• Consult with business users, clients, and cross‑functional technology teams to advise on advanced programming solutions and resolve technical issues.


• Track business unit performance against IT plans and service level agreements, identifying and escalating gaps as needed.


• Define and uphold operating standards and development processes across the team.


• Act as a subject matter expert and mentor to junior analysts and other team members.


• Assess risk in technology and business decisions, ensuring compliance with applicable laws, regulations, and Citigroup policies.


• Operate with a high degree of autonomy and independent judgment while supporting senior stakeholders across the organization.

Qualifications

• 5+ years' experience in UI or full‑stack development, with a strong focus on front‑end engineering.


• Mandatory proficiency in .NET and C#, with demonstrated experience building or supporting enterprise‑grade applications.


• Proficiency in React; experience with Angular is a plus, as the broader team maintains components in both frameworks.


• Solid command of HTML5, CSS3, and JavaScript as core front‑end technologies.


• Experience with test frameworks and a commitment to fully automated testing practices.


• Knowledge of TypeScript is preferred.


• Experience with JSON/XML data formats and REST API‑based web service integrations.


• Prior experience in financial services, capital markets, or trade processing applications is a significant advantage.


• Familiarity with Security Financing Transactions, Fixed Income, or similar capital markets instruments is beneficial.


• Strong self‑motivation, attention to detail, and the ability to operate independently with limited supervision.

Education

• Bachelor's degree in Computer Science, Engineering, related field or equivalent professional experience.

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

Job Family Group

Technology

Job Family

Applications Development

Time Type

Full time

Primary Location Full Time Salary Range

$94,300.00 - $141,500.00

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.

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.

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