Cloud Infrastructure Engineer

We are looking for a Senior Cloud Infrastructure Engineer to join our team and help build, scale, and evolve our multi-tenant SaaS hosting platform on AWS. Our platform dynamically provisions, manages, and scales hundreds of Moodle LMS instances for education clients — powered by custom orchestration tooling, distributed service discovery, and infrastructure as code. This is a hands-on infrastructure role. You'll work across the full stack — from Terraform modules and Puppet manifests to Python automation and observability pipelines. The platform is not containerised — there is no Kubernetes here — so we're looking for someone who understands Linux systems deeply and can reason about distributed systems problems from first principles. You'll have real ownership and influence over the platform's architecture and direction as we continue to grow and evolve the infrastructure. What You'll Be Doing Designing, building, and maintaining AWS infrastructure using Terraform (EC2, RDS, S3, SQS, Lambda, ALB, ElastiCache, Route 53, VPC networking) Writing and maintaining Puppet modules to configure and manage fleets of EC2 instances across multiple auto-scaling groups Maintaining and extending Python-based automation and tooling that supports platform operations Operating and improving distributed service discovery and configuration management (etcd) Managing and tuning a multi-tier caching strategy (Varnish, Redis/Valkey, PHP OPcache) Running and scaling our observability stack (Prometh