Senior Platform Engineer - AWS

The Onset; Sydney; On-site; AUD 180,000 - 230,000; Full time

Job summary

The Onset is seeking a Senior Platform Engineer to shape a dedicated product engineering environment at scale. You will drive meaningful platform engineering work within a large global organisation without being lost in a vast infrastructure function.

You’ll own multi-region AWS, reusable Terraform modules, and robust reliability practices while advancing observability, incident response, and production health. You may explore AI-assisted tooling to augment engineering workflows.

Qualifications

• Senior Platform/DevOps engineer with deep AWS experience.

Responsibilities

• Own multi-region AWS setup across Lambda, Aurora RDS, VPC, ALB, Route53, IAM and KMS.
• Create reusable Terraform/Terragrunt modules used across environments.
• Maintain reliability with a 99.98% SLO and strong production health monitoring.
• Improve observability and incident response; automate health checks and runbooks.
• Strengthen secure cloud networking (Transit Gateway, Network Firewall) and CI/CD pipelines.
• Leverage Puppet, Hiera for configuration management at scale.
• Lead platform decisions and drive next-version platform design.

Job description

Senior Platform EngineerYou probably don’t need another Platform Engineering job.
If you’re already running AWS at scale, building Terraform modules and getting pulled into the difficult production incidents, moving somewhere else to do more of the same is not much of a reason to leave.
This role is different because there is still meaningful platform engineering left to do.
You’ll join a dedicated product engineering environment with the scale, investment and technical standards of a large global organisation, without disappearing into a huge infrastructure function where every decision has already been made.

What you’ll actually own

• Multi-region AWS across Lambda, Aurora RDS, VPC, ALB, Route53, IAM and KMS
• Reusable Terraform/Terragrunt modules used across customer environments
• Reliability engineering against a 99.98% SLO
• Observability, incident response and production health
• Secure cloud networking, including Transit Gateway and Network Firewall
• CI/CD across GitHub Actions and Bitbucket Pipelines
• Puppet, Hiera and configuration management at scale

The expectation is not that you simply operate what already exists.
You’ll lead ambiguous infrastructure problems, improve the standards other teams build against and help decide what the next version of the platform should look like.

This is platform engineering, not ticket ops

The goal is to make developers faster without making production less safe.
That means building repeatable infrastructure, better deployment paths, stronger guardrails and tooling that removes manual work rather than creating another queue for engineers to wait in.
When something foundational needs to change, you’ll be one of the people deciding how it should work.

There’s also room to push into AI-assisted engineering

The team is already exploring Claude, GitHub Copilot and agent-based workflows for platform and DevOps engineering.
That includes custom instructions, tool-calling schemas and autonomous tooling, rather than simply handing engineers another chat interface.

Who this suits

You’re likely already a Senior Platform, DevOps, Cloud or SRE Engineer.
You know AWS deeply, have built reusable infrastructure rather than just consumed it, and can move comfortably across Linux, networking, CI/CD, security, Python or Bash and production troubleshooting.
You’re also the sort of engineer people involve when a problem crosses multiple systems and there isn’t an obvious answer.

Why consider leaving a good job?

Because mature platform roles can eventually become maintenance jobs.
The architecture is decided. The hard problems have been solved. Your job becomes keeping everything moving.
This one still has important platform decisions left to make.
You’ll get enough scale and complexity to make the engineering interesting, while still having enough influence to change how the platform is built.
If you’re already doing this kind of work somewhere else and weren’t planning on moving, that’s exactly who we’d like to speak to.