Senior Full Stack Developer (10+ years) to re-architect and refactor legacy Spring Boot applications into modern microservices using React, AWS

S.i. Systems

Toronto, Ontario, Canada
Contract
Posted June 17, 2026
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Job Description

Contract Details

  • 6-month contract to start
  • 4 days onsite; Friday is a flex day
  • Every second Friday = no-meeting day
  • 37.5 hours/week

    • Must Haves

  • Extensive hands-on experience in Spring Boot backend development
  • Proven ability developing modern React applications including component-based architecture and state management
  • Track record in re-architecting monolithic applications into microservices
  • Strong background with AWS cloud services and Terraform for infrastructure automation
  • Practical knowledge of Airflow for orchestration and workflow scheduling

    • Nice to Have

  • Exposure to Agile collaboration tools such as Jira
  • Experience contributing to CI/CD pipelines or code review processes

    • Responsibilities

  • Re-architect and refactor a legacy monolithic Spring Boot application into a microservices-based architecture
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