React developer Jobs in Mississauga, ON

The Full Stack 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.

Responsibilities:

• Design, develop and maintain scalable full-stack applications using ReactJS, Typescript and NestJS.

• Translate complex business requirements into technical architecture and design documents.

• Contribute to system architecture decisions ( monolith vs microservices, database design, API strategies)

• Support development strategies and CI/CD pipelines, ensuring smooth release processes

• Lead by example in using Claude Codeas a primary development accelerator . From scaffolding features and writing tests to refactoring and documentation generation.

• Design and implement agentic workflowswhere Claude Code autonomously handles multi-step engineering tasks such as issue triage, code review assistance, PR generation, and deployment scripting.

• Ideate and prototype AI-augmented engineering processes identifying opportunities where agentic AI can reduce manual effort across the SDLC (, automated bug fixes, test generation, dependency upgrades).

• Establishprompt engineering standards and best practicesfor the team to ensure consistent, high-quality outputs from AI coding tools.

• Evaluate and integrateemerging AI coding capabilitiesinto the team's toolchain, staying ahead of the curve on agentic AI developments.

• Define guardrails, review processes, and quality gates for AI-generated code to ensure security, correctness, and maintainability.

Qualifications:

• Deep proficiency in ReactJS (hooks, context, state management libraries such as Redux/Zustand/Recoil)

• At least 5+ years in full-stack development with ReactJS, Typescript, NestJS

• Advanced Typescript knowledge or similar language including generics, decorators and advanced typing strategies.

• Strong experience in NestJS or similar framework (modular architecture, middleware, interceptors, guards, providers)

• Expert in API design principals (REST, GraphQL, versioning, error handling, performance tuning)

• Proficiency with databases (SQL & NoSQL) and related tools like TypeORM or Prisma.

• Strong command of modern HTML/CSS, responsive design and accessibility standards.

• Experience with design systems and component libraries

• Familiarity with event-driven architecture, messaging queues (Kafka, RabbitMQ, etc)

• Experience with AI coding

• Skilled in designing distributed systems and scalable applications.

• Knowledge of DevOps practices (Docker, Kubernetes, Terraform, CI/CD pipelines)

• Hands-on experience with large-scale, production-grade applications

Education:

• Bachelor’s degree/University degree or equivalent experience

• Master’s degree preferred

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

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Job Family Group:

Technology

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Job Family:

Applications Development

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Time Type:

Full time

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Primary Location Full Time Salary Range:

$94, - $141,

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Most Relevant Skills

Please see the requirements listed above.

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Other Relevant Skills

For complementary skills, please see above and/or contact the recruiter.

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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.

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