Vendor exit and in-house infrastructure
The platform ran on a single outside vendor — development and hosting both — that also owned the source code, priced at $1M to buy. I recommended rebuilding in-house instead, and led the exit against two contractual deadlines.
I reverse-engineered the vendor's undocumented stack (VMware, Docker Swarm, Traefik, NFS, MinIO, Redis, Postgres) to plan the migration, provisioned a transitional AWS environment as Terraform modules to keep the legacy application serving through the rebuild, then decommissioned all 75 resources afterward — tearing it down only after restoring its offsite backup into a clean Postgres and diffing 3.23M rows against production.