Senior Applications Developer (6-8 years of experience) to develop and maintain backend payment applications using Go (Golang) 107494-1

S.I. Systems Ltd.; Toronto; Hybrid; CAD 110,000 - 140,000; Full time

Job summary

S.I. Systems Ltd. is hiring a Senior Applications Developer to design, develop, and maintain backend payment applications using Go (Golang).

The role emphasizes ownership across the full software delivery lifecycle, mentorship within a small team, and collaboration with payment systems in a capital markets context. The position is hybrid with 2 onsite days (Wednesday and Thursday) at 141 Bay Street, Toronto, and a 6-month contract with potential extension.

Qualifications

• 6-8 years of software development experience
• 2-3 years of hands-on Go backend development
• Test-Driven Development and comprehensive unit test suite development
• Snyk, SonarQube, and static code analysis or vulnerability scanning tools
• Technical leadership, mentorship, or development guidance experience within software development teams

Responsibilities

• Design, develop, enhance, and maintain backend applications using Go (Golang)
• Take ownership of development deliverables from requirements analysis through testing and production deployment
• Understand existing application architecture, business domain, dependencies, and supporting systems
• Support development, integration testing, user acceptance testing, implementation, and production release activities
• Lead smaller projects or application initiatives independently
• Provide technical direction, mentorship, and development guidance to team members
• Use static code analysis and security scanning tools to address code quality and vulnerability concerns

Skills

Go (Golang)

Software development

Test-Driven Development

Static code analysis

Security scanning

Technical leadership

Tools

Snyk

SonarQube

Job description

Senior Applications Developer (6-8 years of experience) to develop and maintain backend payment applications using Go (Golang) 107494-1

Our financial services client is seeking a Senior Applications Developer (6-8 years of experience) to develop and maintain backend payment applications using Go (Golang)

Join a Capital Markets technology team supporting a legacy Payment Hub Foreign Exchange platform critical to backend payment processing. This role focuses on hands-on Golang development, application maintenance, testing support, and production deployment across the full software delivery lifecycle. The position offers end-to-end ownership of backend development initiatives while contributing technical direction and mentorship within a smaller development team. Candidates will work closely with established payment systems and supporting business domains in a high-visibility environment.

Hybrid, 2days onsite - Wednesday Thursday

141 Bay Street, Toronto

Contract for 6 months with a possibility of extension

Must Haves

• 6-8 years of software development experience
• 2-3 years of hands-on Go (Golang) backend application development
• Test-Driven Development and comprehensive unit test suite development
• Snyk, SonarQube, and static code analysis or vulnerability scanning tools
• Technical leadership, mentorship, or development guidance experience within software development teams

Nice to Have

• Awareness of AI-assisted or AI-driven software development tools and practices
• Exposure to payment applications, foreign exchange platforms, or Capital Markets technology environments

Responsibilities

• Design, develop, enhance, and maintain backend applications using Go (Golang)
• Take ownership of development deliverables from requirements analysis through testing and production deployment
• Understand existing application architecture, business domain, dependencies, and supporting systems
• Support development, integration testing, user acceptance testing, implementation, and production release activities
• Lead smaller projects or application initiatives independently
• Provide technical direction, mentorship, and development guidance to team members
• Use static code analysis and security scanning tools to address code quality and vulnerability concerns

Our financial services client is seeking a Senior Applications Developer (6-8 years of experience) to develop and maintain backend payment applications using Go (Golang)

Join a Capital Markets technology team supporting a legacy Payment Hub Foreign Exchange platform critical to backend payment processing. This role focuses on hands-on Golang development, application maintenance, testing support, and production deployment across the full software delivery lifecycle. The position offers end-to-end ownership of backend development initiatives while contributing technical direction and mentorship within a smaller development team. Candidates will work closely with established payment systems and supporting business domains in a high-visibility environment.

Hybrid, 2days onsite - Wednesday Thursday

141 Bay Street, Toronto

Contract for 6 months with a possibility of extension

Must Haves

• 6-8 years of software development experience
• 2-3 years of hands-on Go (Golang) backend application development
• Test-Driven Development and comprehensive unit test suite development
• Snyk, SonarQube, and static code analysis or vulnerability scanning tools
• Technical leadership, mentorship, or development guidance experience within software development teams

  Nice to Have

  • Awareness of AI-assisted or AI-driven software development tools and practices
  • Exposure to payment applications, foreign exchange platforms, or Capital Markets technology environments

  Responsibilities

  • Design, develop, enhance, and maintain backend applications using Go (Golang)
  • Take ownership of development deliverables from requirements analysis through testing and production deployment
  • Understand existing application architecture, business domain, dependencies, and supporting systems
  • Support development, integration testing, user acceptance testing, implementation, and production release activities
  • Lead smaller projects or application initiatives independently
  • Provide technical direction, mentorship, and development guidance to team members
  • Use static code analysis and security scanning tools to address code quality and vulnerability concerns

  Disclaimer:

  AI may be used in evaluating candidates.

  This posting is for an existing vacancy.