Senior Cloud Infra Engineer - AWS, Terraform, Python

Open LMS; United Kingdom; On-site; GBP 90,000 - 130,000; Full time

Job summary

Open LMS is seeking a Senior Cloud Infrastructure Engineer to scale our multi-tenant SaaS hosting platform on AWS. You will own Terraform modules, Puppet fleets, Python automation, and observability, while reasoning about distributed systems from first principles.

The role is hands-on with Linux systems, networking, and performance tuning. You will design, implement, and operate the platform, collaborating across teams to improve reliability and deployment workflows.

Qualifications

• Strong experience with AWS in production.
• Proficiency in authoring and maintaining Terraform modules for production infrastructure.
• Proficiency in authoring and maintaining Puppet modules for fleet management.
• Solid Python skills for writing production daemons.
• Deep Linux systems knowledge (Ubuntu) including Apache/Nginx, PHP-FPM, Varnish, systemd, mounts and networking.
• Understanding of distributed systems concepts: consensus, leader election, locking, eventual consistency.

Responsibilities

• Designing, building, and maintaining AWS infrastructure using Terraform (EC2, RDS, S3, SQS, Lambda, ALB, ElastiCache, Route 53, VPC).
• Writing and maintaining Puppet modules to configure and manage fleets of EC2 instances across auto-scaling groups.
• Maintaining 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 observability stack (Prometheus, Grafana, Loki, Fluentd, PagerDuty) and participating in on-call rotations.
• Evaluating and implementing distributed storage solutions as the platform evolves.
• Improving deployment workflows and release processes.
• Collaborating with internal teams on API contracts and tooling.
• Participating in incident response and platform reliability improvements.

Skills

AWS

Terraform

Puppet

Python

Linux (Ubuntu)

Distributed systems

Observability

CI/CD

Tools

Terraform modules

Puppet modules

GitLab CI/CD

Job description

Open LMS is seeking a Senior Cloud Infrastructure Engineer to scale our multi-tenant SaaS hosting platform on AWS. You will own Terraform modules, Puppet fleets, Python automation, and observability, while reasoning about distributed systems from first principles.

The role is hands-on with Linux systems, networking, and performance tuning. You will design, implement, and operate the platform, collaborating across teams to improve reliability and deployment workflows.