Mobile applications developer Jobs in Oakville, ON

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 Enterprise 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.

Position Overview:

The Application Development AI Developer is an intermediate level position responsible for participation in the establishment and implementation of new or revised application systems and programs in coordination with the Technology team. The overall objective of this role is to contribute to applications systems analysis and programming activities. We are seeking a forward-thinking developer to join our engineering team. In this role, you will implement cutting-edge artificial intelligence, leveraging Large Language Models (LLMs) and the Model Context Protocol (MCP) to build next-generation applications. You will combine your growing AI expertise with a solid foundation in backend engineering, managing APIs, and optimizing database performance. If you are eager to work with modern developer tools, learn autonomous workflows, and build scalable solutions, this role is for you. Responsibilities:

• AI Integration: Build and deploy applications powered by LLMs, integrating prompt engineering, retrieval-augmented generation (RAG), and basic agentic workflows.
• Context Ecosystems: Implement Model Context Protocol (MCP) to securely connect AI models with local or remote data sources and tools.
• API Development: Design, build, and maintain high-performance RESTful APIs to support application features.
• Database Management: Write, optimize, and troubleshoot SQL queries, views, and schemas within Microsoft SQL Server.
• AI-Assisted Engineering: Adopt and utilize advanced autonomous AI software engineers (like Devin) to accelerate development, write tests, and streamline your workflow.
• Perform Integration work and L3 support for over 20+ vendor applications supporting the Tax Reporting, Tax Diligence, and Tax Withholding space. The role involves working with our vendor and internal TI and IT partners for the deployment and integration of the vendor tax apps with various Citi applications (primarily via API communication).
• Conduct tasks related to feasibility studies, time and cost estimates, IT planning, risk technology, applications development, model development, and establish and implement new or revised applications systems and programs to meet specific business needs or user areas
• Monitor and control all phases of development process and analysis, design, construction, testing, and implementation as well as provide user and operational support on applications to business users
• Utilize in-depth specialty knowledge of applications development to analyze complex problems/issues, provide evaluation of business process, system process, and industry standards, and make evaluative judgement
• Recommend and develop security measures in post implementation analysis of business usage to ensure successful system design and functionality
• Consult with users/clients and other technology groups on issues, recommend advanced programming solutions, and install and assist customer exposure systems
• Ensure essential procedures are followed and help define operating standards and processes
• Serve as advisor or coach to new or lower-level analysts
• Has the ability to operate with a limited level of direct supervision.
• Can exercise independence of judgement and autonomy.
• Acts as SME to senior stakeholders and /or other team members.
• Appropriately assess risk when business decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citigroup, its clients and assets, by driving compliance with applicable laws, rules and regulations, adhering to Policy, applying sound ethical judgment regarding personal behavior, conduct and business practices, and escalating, managing and reporting control issues with transparency.

Qualifications:

• 5+ years of relevant experience
• LLM Experience: Hands-on experience integrating enterprise LLMs (e.g., OpenAI GPT, Anthropic Claude) via APIs using frameworks like LangChain or LlamaIndex.
• Model Context Protocol (MCP): Understanding of or direct experience implementing MCP to establish connections between AI models and context providers.
• API Development: 2–5 years of experience in backend API architecture, data validation, and security protocols.
• SQL Server: Strong proficiency in MS SQL Server, relational database design, and query performance tuning.
• Experience performing application integrations
• Experience in systems analysis and programming of software applications
• Experience in managing and implementing successful projects
• Working knowledge of consulting/project management techniques/methods
• Ability to work under pressure and manage deadlines or unexpected changes in expectations or requirements

Preferred & Plus Skills

• Devin/AI Agents: Familiarity or hands-on experience using Devin or similar autonomous coding platforms to augment coding speed is highly valued.
• .NET Ecosystem: Experience with Cand .NET Core/.NET 8+ for building enterprise-grade backend systems.
• Cloud & DevOps: Familiarity with AWS/Azure and basic CI/CD pipelines (e.g., GitHub Actions, Docker).
• JIRA experience a plus.

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. ------------------------------------------------------

Job Family Group:

Technology ------------------------------------------------------

Job Family:

Applications Development ------------------------------------------------------

Time Type:

Full time ------------------------------------------------------

Primary Location Full Time Salary Range:

$94,300.00 - $141,500.00 ------------------------------------------------------

Most Relevant Skills

Please see the requirements listed above. ------------------------------------------------------

Other Relevant Skills

API Development, Artificial Intelligence (AI), Large Language Models (LLMs), Model Context Protocol. ------------------------------------------------------

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. ------------------------------------------------------ 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.