Senior Full Stack Java Developer Jobs in Mississauga, ON

Citi is looking for a Full Stack Java Developer to join its Technology team and play a meaningful role in the design, development, and enhancement of critical application systems. In this role, you will work across the full software stack - building robust server-side Java solutions alongside modern front-end components - to deliver technology that directly supports clients and internal stakeholders. This is an opportunity to bring technical depth and problem-solving capability to a global financial institution where engineering quality and sound judgement matter.

Responsibilities Design and develop enhancements to application systems by applying knowledge of software development procedures, analysing existing code, and leveraging scripting tools to deliver reliable, scalable solutions. Build and implement programming solutions in collaboration with users, clients, and cross-functional technology teams, ensuring systems meet functional and performance requirements. Develop application components to specification, translating design requirements into clean, maintainable code across both front-end and back-end layers.

Identify and remediate application vulnerabilities through structured security analysis, testing, and debugging to maintain a robust and secure codebase. Diagnose and resolve technical issues by drawing on hands-on experience, evaluating available options, and implementing effective solutions with minimal supervision. Coach and support junior analysts, sharing technical knowledge and contributing to team capability development.

Evaluate the risk implications of technical decisions, ensuring all development work aligns with applicable standards, policies, and control requirements. Required Qualifications & Skills 2+ years of experience in a Java application development role, with hands-on server-side Java (Java 8) coding skills and proficiency in concurrent programming. Working knowledge of JavaScript, Angular, jQuery, and CSS for front-end development.

Experience with Oracle and/or MongoDB databases. Familiarity with Agile, Scrum, or Test-Driven Development practices within a software delivery environment. Practical knowledge of modern application architecture, including Microservices frameworks such as Spring Boot, event-driven services, and cloud-native application development.

Hands-on experience with Web APIs, Kafka, and Git for version control and integration workflows. Clear and effective written and verbal communication skills, with the ability to adapt priorities quickly as project needs evolve. Beneficial Skills & Qualifications Experience with IBM WebSphere application server environments.

Background in data modelling or data architecture, providing an additional perspective when designing application data layers. Demonstrated ability to lead or manage technical workstreams, with experience contributing to project planning and delivery oversight. Bachelor's degree or university qualification in a relevant discipline, or equivalent practical experience.

What We Offer At Citi, you will work alongside skilled engineers on technology that operates at global scale, with the autonomy to make real technical decisions and the support to grow your career over the long term. We offer a collaborative, performance-driven environment where your engineering contributions have a direct and measurable impact. Hybrid working model with 3 days in the office and 2 days working remotely, giving you flexibility without sacrificing team connection.

Access to structured learning and development programmes to keep your technical skills current and support your career progression. Exposure to complex, large-scale engineering challenges across a global technology organisation. Wellbeing support and work-life balance resources designed to help you perform at your best.

Competitive financial wellbeing benefits and a compensation package aligned to your experience and contribution. Opportunity to act as a subject matter expert and grow your influence across teams and senior stakeholders. Build impactful technology at global scale - apply today to bring your full-stack Java expertise to Citi's Technology team.

------------------------------------------------------ Job Family Group: Technology ------------------------------------------------------ Job Family: Applications Development ------------------------------------------------------ Time Type: Full time ------------------------------------------------------ Primary Location Full Time Salary Range: $79,320.00 - $110,680.00 ------------------------------------------------------ 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. ------------------------------------------------------ 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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