Senior Full Stack Engineer (React/Node/Nest)

Our client is seeking a Senior Full stack engineer on a contract basis to design and deliver scalable APIs, modern web applications, and cloud-native solutions. This is a hands on delivery role requiring strong technical leadership, deep experience with event-driven architectures and microservices, and the ability to work iteratively in a fast-paced Agile environment.

Location: Markham Hybrid, 4 days onsite per week

Duration: 12-Month Contract

Responsibilities

• Design, develop, and implement highly scalable APIs and full-stack applications.
• Build modern web solutions using React, NestJS/Node.js, and Spring Boot.
• Design and implement event-driven architectures and microservices for distributed systems.
• Deploy and manage cloud-native applications using Azure Container Apps, Azure API Management (APIM), and Docker.
• Build and maintain CI/CD pipelines using Azure DevOps.
• Implement Infrastructure as Code using Bicep, Terraform, ARM Templates, Pulumi, or similar technologies.
• Design and optimize relational and NoSQL database solutions.
• Plan and manage code merges, branching strategies, releases, and production deployments.
• Develop detailed deployment plans and support production releases.
• Build observable applications using Azure monitoring, logging, tracing, and telemetry.
• Leverage feature flags and modern deployment practices to enable rapid, incremental releases.
• Use secure AI-assisted development tools while adhering to security and compliance requirements.
• Collaborate with cross-functional teams to evaluate solution options and drive technical decisions.
• Troubleshoot and resolve complex technical and production issues.
• Take strong ownership of delivery and adapt quickly as business requirements evolve.

Requirements

• 10+ years of experience designing and building scalable APIs.
• 8+ years of modern web application development experience, including React and Node.js frameworks; NestJS preferred.
• Deep understanding of event-driven architecture and microservices.
• Hands on experience with Azure Container Apps, APIM, Docker, and Azure DevOps CI/CD, or comparable AWS technologies.
• Experience with Infrastructure as Code, ideally Bicep, Terraform, ARM Templates, Pulumi, or equivalent.
• Strong knowledge of SQL and NoSQL databases.
• Experience managing branching strategies, code merges, releases, and production deployments.
• Strong analytical and problem-solving skills with the ability to troubleshoot complex technical issues.
• Ability to explain complex technical concepts and lead solution discussions.
• Strong ownership mindset with a focus on shipping production-ready solutions.
• Ability to work effectively with incremental and changing business requirements.
• Ability to work onsite in Markham four days per week.

Nice to Have

• Experience developing discounting or rules engines.
• Experience with TanStack within React applications.
• Experience producing technical design documents and solution-option analyses.
• Experience with Application Insights, Log Analytics, distributed tracing, dashboards, alerting, and telemetry-driven troubleshooting.
• Experience with Agile delivery tools such as Azure DevOps (ADO) and JIRA.
• Experience planning technical debt remediation and continuous improvement initiatives.
• Strong technical leadership, planning, organization, communication, and presentation skills.
• Demonstrated ability to balance speed of delivery, engineering excellence, technical trade-offs, and competing priorities.