Q. Size/shape of AWS you owned (accounts, regions, scale, on-call)
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Across my experience at IBM, Xebia, OpenText, and Diehl Metering, I have worked on AWS environments from both a platform engineering and security architecture perspective, covering design, operations, and governance.

My role was not limited to provisioning — I owned the reliability, security, and operational behaviour of production systems.

Overall Environment Shape
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- Multi-account AWS environments using landing zone concepts
- Multi-region deployments for high availability and resilience
- Mix of cloud-native and hybrid (AWS + datacenter) architectures
- Enterprise workloads across banking, retail, and industrial platforms

IBM – Hybrid and DR Foundations
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At IBM, I worked in hybrid environments integrating AWS with on-premise datacenters.

- Supported disaster recovery between AWS and datacenter
- Worked closely with on-ground teams for recovery execution
- Part of a 2-week rotational on-call model handling production issues

This gave me strong exposure to real incident handling and recovery scenarios.

Xebia – Architecture and Scale
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At Xebia, I worked on designing and delivering AWS platforms for enterprise customers.

- Built multi-region architectures for high availability
- Supported retail platforms handling millions of transactions per day
- Created reusable infrastructure patterns for multiple regions

The focus here was on scalability and consistent architecture design.

OpenText – Production Operations
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At OpenText, I owned production AWS environments for enterprise customers.

- Managed EC2, RDS, S3, IAM, and networking services
- Responsible for platform stability, scaling, and issue resolution
- Focused on reducing incidents and improving operational reliability

Diehl Metering – Governance and Security
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At Diehl Metering, I worked on structured multi-account AWS environments.

- Landing zone setup with guardrails and governance controls
- IAM role-based access and least-privilege enforcement
- Centralised logging and monitoring

- Part of a 1-week per month on-call rotation supporting production systems

This role focused more on governance, compliance, and secure platform operations.

Operational Ownership
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Across these roles, I was responsible for:

- Infrastructure provisioning using Terraform
- CI/CD-driven deployments
- IAM and security controls
- Monitoring and alerting
- Backup and disaster recovery
- On-call support and incident handling

Architectural Perspective
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From a solutions and security perspective, I focus on:

- Designing for failure (multi-region, DR readiness)
- Enforcing least privilege
- Ensuring infrastructure is reproducible
- Embedding security into delivery workflows

Summary
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I have worked across hybrid and cloud-native AWS environments, operating at enterprise scale with strong requirements for reliability, security, and compliance.

My approach is to build and operate systems that are:

- resilient
- secure
- and operationally predictable