Site Reliability Engineer (SRE) – Cloud Migration (Contract)

Why this Role

As an SRE at LINE MAN Wongnai, you will own the reliability of the infrastructure behind the LINE MAN product and lead its migration from our private cloud to AWS. You will be responsible for the full infrastructure lifecycle, from provisioning non-production environments to operating production, across both Day 1 and Day 2 operations.

Your work directly determines whether millions of users, merchants, and riders experience a seamless transition. You will cover Kubernetes, storage, networking, and databases (MongoDB first, followed by PostgreSQL and MySQL), and partner with development teams through the cutover of each service. This is a rare opportunity to take part in a large-scale private-to-public cloud migration, and to grow your expertise in AWS, large-scale data migration, and production operations alongside a team that values ownership and blameless learning.

What You’ll Do

• Plan and execute the migration of services and infrastructure from the private cloud to AWS, covering Kubernetes workloads, storage, networking, and data layers.
• Prepare resources and action plans before each migration, including capacity assessment, infrastructure sizing, runbooks, and rollback procedures.
• Support the cutover period of each service in collaboration with development teams, from pre-cutover readiness and the cutover window through post-cutover stabilization and decommissioning of legacy systems.
• Provision and manage non-production and production infrastructure on AWS using Infrastructure as Code and automation.
• Operate, and maintain Kubernetes clusters (such as Amazon EKS) including cluster upgrades, capacity management, persistent volumes, object storage.
• Operate and migrate databases, prioritizing MongoDB, followed by PostgreSQL and MySQL, covering replication, high availability, backup and recovery, and performance monitoring.
• Be responsible for Day 1 and Day 2 operations, including capacity planning, patching, upgrades, and disaster recovery.
• Monitor availability, latency, and overall system health, and ensure services meet defined reliability targets.
• Improve monitoring, alerting, and system resilience across both the legacy and AWS environments.
• Automate operational tasks to improve reliability and delivery speed.
• Practice sustainable incident response and conduct blameless postmortems.

What You’ll Need

• At least 3–5 years of experience in an SRE or comparable infrastructure role, with a proven record of designing scalable and reliable infrastructure.
• Hands-on experience with AWS, including services such as EC2, VPC, IAM, EKS, S3, EBS, RDS/Aurora, and CloudWatch.
• Hands-on experience operating Kubernetes in production environments.
• Understanding of storage concepts and technologies, including block, file, and object storage, backup, and recovery.
• Experience operating databases, with at least one of MongoDB, PostgreSQL, or MySQL, and an understanding of replication, high availability, and backup and recovery.
• Experience with Infrastructure as Code (such as Terraform) and CI/CD pipelines.
• Experience designing, analyzing, and troubleshooting microservices.
• Understanding of monitoring, logging, and tracing tools such as ELK, Prometheus, Grafana, and Jaeger.
• A systematic approach to problem-solving, with the ability to prepare clear action plans and operate effectively within time-constrained cutover windows.
• Effective communication and collaboration skills, with the ability to work closely with development teams.

What Sets You Apart

• Experience with private cloud to public cloud migration, including large-scale database migration with minimal downtime.
• Familiarity with migration tooling such as AWS DMS and native replication mechanisms (for example, MongoDB replica sets and PostgreSQL logical replication).
• Linux and network administration skills for troubleshooting.
• Programming experience in Go, Python, or a similar language for automation.
• Experience with GitOps practices and tools such as Argo CD.
• Knowledge of security and security testing, including IAM, encryption, and network security.
• Experience with cloud cost optimization.
• AWS certification (such as Solutions Architect or SysOps Administrator).