5G Telecom Giant, Thailand

The Challenge

Thailand's largest 5G telecom operator runs infrastructure at national scale — 5G networks, digital services, and subscriber data across millions of users. The migration challenge wasn't simply moving workloads; it was re-platforming a heterogeneous stack of four distinct data systems (MSSQL, MongoDB, Redis, Kafka) simultaneously, without disrupting live telecom services. Every architectural decision carried a second constraint: this was the first of twelve sites requiring migration, meaning the design had to function as a reusable, Terraform-driven blueprint — not a one-off solution. The on-premises environment lacked the elastic capacity needed for 5G growth, manual deployment processes were creating release bottlenecks, and Thailand's PDPA data protection regulations alongside NBTC telecom compliance requirements imposed strict data residency and audit obligations that had to be embedded into the OCI architecture from day one. A mandatory two-week holiday freeze fell mid-way through PROD cutover — requiring a phased cutover strategy designed to pause safely and resume cleanly without rollback risk.

Our Solution

GYSP designed and delivered a full OCI cloud architecture from scratch — an intentional re-platform, not a lift-and-shift. Phase 1 began with a full Architecture Assessment and HLD/LLD design, establishing an OCI Landing Zone aligned to Oracle's reference architecture and customised for the client's network topology, security policies, and PDPA compliance requirements. Terraform Infrastructure-as-Code and Oracle DevOps pipelines were engineered to automate the entire provisioning stack, producing a fully auditable and repeatable deployment framework. Database migrations were executed concurrently across all four platforms: MSSQL migrated to OCI Autonomous Database, MongoDB to OCI ADB JSON, Redis to OCI Cache with TTL-aware configuration, and Kafka re-platformed (not lifted) to OCI Streaming — with producers and consumers validated at the protocol level to catch incompatibilities before production. All microservices were containerised and deployed to OKE (Oracle Kubernetes Engine) using Blue/Green deployment strategies to achieve zero production downtime at cutover. A DR setup and live DR Drill were delivered in Phase 7 to validate active-passive failover. The full delivery artefact set — Terraform modules, runbooks, SOPs, test scripts, and migration playbooks — was structured as a reusable framework explicitly designed to accelerate the remaining 11 site migrations.

Key Deliverables

• Full OCI Landing Zone designed from scratch — customised to PDPA, NBTC compliance, and client network topology
• MSSQL → OCI ADB, MongoDB → OCI ADB JSON, Redis → OCI Cache — four concurrent heterogeneous database migrations
• Kafka re-platformed to OCI Streaming with full producer/consumer protocol validation (not lift-and-shift)
• All microservices containerised on OKE with Blue/Green deployment for zero-downtime PROD cutover
• Terraform IaC + Oracle DevOps pipelines delivering fully automated, auditable cloud provisioning
• Migration framework engineered as a reusable blueprint for 11 remaining sites in the programme

Services Delivered

• Cloud Architecture
• OCI Migration
• Infrastructure as Code
• DevOps Engineering

Tech Stack

Frequently Asked Questions