Cloud Infrastructure Engineer (Open LMS) UK, Remote
Lietuvos Geležinkeliai3 months ago
Remote, United KingdomSenior
Responsibilities
- Design, build, and maintain AWS infrastructure using Terraform across services including EC2, RDS, S3, SQS, Lambda, ALB, ElastiCache, Route 53, and VPC networking.
- Write and maintain Puppet modules for fleets of EC2 instances across multiple auto-scaling groups.
- Maintain and extend Python-based automation, tooling, and production daemons supporting platform operations.
- Operate distributed service discovery and configuration management with etcd.
- Manage and tune caching using Varnish, Redis/Valkey, and PHP OPcache.
- Run and scale the Prometheus, Grafana, Loki, Fluentd, and PagerDuty observability stack.
- Evaluate and implement distributed storage solutions as the platform evolves.
- Improve deployment workflows and release processes for non-containerized environments.
- Collaborate on API contracts, integration patterns, and operational tooling.
- Participate in on-call rotations, incident response, root cause analysis, and platform reliability improvements.
Requirements
- Strong production experience with AWS, particularly EC2, RDS, S3, SQS, Lambda, ALB, ElastiCache, Route 53, IAM, and VPC networking.
- Proficiency authoring and maintaining Terraform modules for production infrastructure.
- Proficiency authoring and maintaining Puppet modules or equivalent agent-based configuration management.
- Solid Python skills for production automation and daemons.
- Deep Linux systems knowledge, particularly Ubuntu, with familiarity with Apache, Nginx, PHP-FPM, Varnish, systemd, filesystem mounts, and networking fundamentals.
- Understanding of distributed systems concepts including consensus, leader election, distributed locking, and eventual consistency.
- Production experience building and maintaining observability pipelines using Prometheus, Grafana, Loki, or equivalent tools.
- Comfort working in a GitLab-based CI/CD workflow.
- Ability to document architectural decisions and explain technical tradeoffs to technical and non-technical stakeholders.
- Preferred experience with distributed storage systems such as Ceph, GlusterFS, JuiceFS, CubeFS, or AWS EFS.
- Preferred familiarity with etcd, Consul, or ZooKeeper, including watch APIs, TTL-based locking, and cluster operations.
- Preferred experience with Varnish and VCL, multi-tenant SaaS platform design, PHP, Moodle LMS, secrets management, credential rotation, and zero-downtime VM-based deployments.
About Lietuvos Geležinkeliai
Lietuvos Geležinkeliai (LTG) is Lithuania’s state-owned railway group, operating passenger and freight services and managing the national rail infrastructure plus related engineering and IT systems. It earns revenue from transport services and infrastructure management, including through subsidiaries LTG Link, LTG Cargo, and LTG Infra. Headquartered in Vilnius, it is the largest railway group in the Baltic States and delivers strategic rail projects that connect Lithuania domestically and internationally.