The only cross-partition S3 migration engine with built-in DORA & NIS2 compliance. Server-side transfers at AWS backbone speed. KMS re-encryption, cryptographic verification, and append-only audit trail — out of the box.
SovereignStack orchestrates server-side S3 copy commands. Objects flow directly between buckets at AWS backbone speed — never through our engine, your VM, or any intermediary.
Standard AWS Partition
European Sovereign Cloud
Orchestration · Validation · Audit — Zero Data Storage · No Telemetry
Built by engineers who understand what compliance teams, CISOs, and regulators actually require. Proven patterns from Swiss banking infrastructure, packaged as a ready-to-deploy migration engine.
Transparent cross-partition re-keying during transfer. Data is decrypted with the source key and re-encrypted with the ESC KMS key — server-side, within AWS.
12-class mapping table preserves your archiving structure. Glacier stays Glacier. No cost surprises after migration. Unmapped classes are safely upgraded.
Exponential backoff with ±25% randomized jitter prevents thundering herd storms when 8 parallel threads retry simultaneously. AWS API stays healthy.
Recursive scrubbing strips AWS access keys, secrets, and session tokens from all audit output. Logs are safe for SOC2, ISO 27001, and regulator handover.
Three-tier ETag validation: direct match, multipart MD5-of-MD5s recomputation, and size verification. Bit-level integrity proof for every single object.
Separate boto3 sessions per partition. Source and target credentials never mix. Memory sanitization after session init. Full IAM Role support for production.
Every design decision was made with the assumption that a compliance officer and a penetration tester will read every line of code.
Objects never transit through the SovereignStack process, its memory, or its filesystem. All copy operations execute server-side within AWS infrastructure.
Zero outbound connections to the developer or third parties. No analytics, no phone-home, no metadata exfiltration. Operates exclusively within your VPC.
SSL context enforced at the Python level for all AWS API calls. No fallback to older protocols. Connection pool capped at 50 for controlled resource usage.
Credential variables are overwritten with null after boto3 session initialization, minimizing exposure window in memory dumps and core files.
SovereignStack is built to be a robust, transparent tool — designed to empower your cloud engineers to handle migrations independently. The code is modular, the documentation is extensive, and every critical path is thoroughly tested. You get the complete source — no black boxes, no vendor lock-in, no phone-home.
Download the High-Level Design — available in English and German.
A senior engineer can prototype an S3 migration script in a week. Getting it production-ready — compliant audit trail, KMS re-encryption, partial failure recovery, and passing a DORA audit — is an entirely different problem.
| Capability | In-House Build | SovereignStack |
|---|---|---|
| Engineering Effort | 4–6 weeks, 1 senior engineer | 1 day setup |
| Estimated Build Cost | USD 25,000 – 40,000 (fully loaded) | — |
| Compliance Validation | 2–4 weeks extra: DORA Art. 12, NIS2, audit trail correctness | Pre-validated, documented |
| Ongoing Maintenance | ~USD 10,000–20,000/yr — AWS API changes, edge cases, security patches | 12-month updates included |
| License Cost | — | USD 7,000 |
| Time to First Migration | 6–10 weeks | Same day |
| Year-1 Total Cost | USD 35,000 – 60,000+ (build + compliance + first-year maintenance) | USD 7,000 |
Get the architecture documentation and a technical walkthrough of SovereignStack. One conversation to see if it fits your migration timeline.