Software Development Engineer III, Scaling Efficiency, CloudTune

Amazon's CloudTune organization is seeking a Senior Software Development Engineer to join the Scaling Efficiency team. CloudTune ensures that Amazon's infrastructure is right-sized at the right time, powering capacity decisions for thousands of EC2-based services across Amazon. Scaling Efficiency sits at the center of this mission, building the automation, data infrastructure, and platform services that make accurate, timely capacity decisions possible at Amazon's scale.

As a Senior SDE, you will own the design and delivery of distributed systems that serve internal customers across science, capacity management, and engineering. You will tackle hard problems in areas like large-scale data processing, workflow orchestration, infrastructure automation, and platform reliability. This is a role for a builder who wants to operate at the intersection of infrastructure and data, someone who can translate ambiguous business problems into well-architected technical solutions, ship them into production, and raise the engineering bar for the team along the way.

Own the end-to-end design, implementation, and operation of distributed systems that serve Amazon-scale workloads.

Lead technical strategy and architecture for your area, making tradeoffs between speed of delivery and long-term platform health.

Drive operational excellence across your systems, including monitoring, alarming, incident response, and on-call ownership.

Partner with scientists, data engineers, and capacity managers to translate business requirements into scalable, maintainable technical solutions.

Identify opportunities to reduce manual toil and close automation gaps through better tooling, self-service interfaces, and data-driven guardrails.

Influence engineering culture through design reviews, code reviews, technical mentorship, and contributions to team-wide best practices.

Scaling Efficiency builds the automation and data infrastructure that powers CloudTune's capacity decisions across Amazon.



Our teams work at the intersection of infrastructure and data science, building platform services that enable accurate forecasting, automated scaling, and efficient capacity management for thousands of EC2-based services. We value ownership, operational excellence, and building systems that compound in value over time, so Amazon's engineers can focus on their customers instead of their infrastructure.

5+ years of non-internship professional software development experience

5+ years of programming with at least one software programming language experience

Experience as a mentor, tech lead or leading an engineering team

5+ years of full software development life cycle, including coding standards, code reviews, source control management, build processes, testing, and operations experience

Experience building complex software systems that have been successfully delivered to customers

Bachelor's degree in computer science or equivalent

Amazon is an equal opportunity employer and does not discriminate on the basis of protected veteran status, disability, or other legally protected status.

Our inclusive culture empowers Amazonians to deliver the best results for our customers. If you have a disability and need a workplace accommodation or adjustment during the application and hiring process, including support for the interview or onboarding process, please visit for more information. The base salary range for this position is listed below. As a total compensation company, Amazon's package may include other elements such as sign-on payments and restricted stock units (RSUs). Amazon offers comprehensive perks including health insurance (medical, dental, vision, prescription, basic life & AD&D; insurance), Registered Retirement Savings Plan (RRSP), Deferred Profit Sharing Plan (DPSP), paid time off, and other resources to improve health and well-being. CAN, ON, Toronto - 150,700.00 - 251,700.00 CAD annually

Amazon is an equal opportunity employer and does not discriminate on the basis of protected veteran status, disability, or other legally protected status. Veterans, military spouses, and people with disabilities are encouraged to apply.

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📌 Software Development Engineer, Amazon (Toronto)
🏢 Amazon
📍 Toronto