Centralized governance API
A single high-performance Data Governance API acts as the sole entry point for all EHR data access. It is built in Go (Golang) for its concurrency and low latency.
Healthcare
National Healthcare Data Compliance & Audit System — a centralized Go governance API with contextual RBAC and a tamper-evident audit ledger
The provider faced an impending, rigorous compliance audit and realized their legacy data management systems were critically flawed. Data was fragmented across disparate legacy databases, making it incredibly difficult to enforce unified access controls or trace data modifications accurately.
- 50%
- 10M+
- 3
The engagement
Client background
Our client is a national healthcare provider operating a vast network of hospitals, clinics, and specialized care centers. They manage the electronic health records of over 5 million patients, encompassing highly sensitive medical histories, diagnostic reports, and personal billing information. As a critical infrastructure entity they are subject to stringent regulatory requirements, including HIPAA and various national data protection laws. The organization employs over 50,000 medical professionals who require reliable, secure, and instantaneous access to patient data to provide effective care.
The challenge
The existing systems relied on outdated authentication protocols, and there was a concerning lack of comprehensive audit logging.
The primary challenge was to unify the data access layer, implement granular Role-Based Access Control, and establish an immutable audit trail for every single data interaction — all while ensuring zero disruption to critical medical services and maintaining fast data retrieval for emergency room staff.
The build
What we built
The architectural moves that replaced the system described above, in the order they shipped.
Contextual RBAC engine
Access requests are evaluated on more than role: the user’s current location (hospital network or remote) and the specific patient-doctor relationship both feed the decision.
Append-only audit ledger
Every read, write and modification is cryptographically signed into a tamper-evident append-only ledger, creating an indisputable history of data access.
Standardized identifiers
All primary keys were migrated to UUIDv4, eliminating predictable identifier vulnerabilities and enabling seamless data merging across hospital branches.
- Go (Golang)
- gRPC
- PostgreSQL (JSONB)
- Elasticsearch
- HashiCorp Vault
- Cryptographic ledger
- HIPAA
National healthcare provider
Stack & architecture
Security built into every layer
Security was not a phase at the end of this build. It was engineered into the same release as the functionality it protects.
Multi-Factor Authentication
Legacy passwords were replaced with robust Multi-Factor Authentication.
TLS 1.3 and volume encryption
All data in transit is secured using TLS 1.3, while data at rest is encrypted at the database volume level.
IDS and network segmentation
Advanced Intrusion Detection Systems were deployed alongside strict network segmentation.
Weekly red-team exercises
Weekly penetration testing and red-team exercises ran in the lead-up to the audit.
Measured results
Outcomes we can defend
Every figure below was reported by the client after go-live.
- 50%
- 10M+
- 3
- 0
The new Go-based API layer reduced data retrieval times by 50% — a critical improvement for emergency medical staff requiring instant access to patient histories.
The immutable audit ledger tracked over 10 million daily data interactions without impacting system performance.
The RBAC implementation prevented three simulated unauthorized access attempts during external security audits.
A first in the organization’s history, with zero violations or critical findings.
Next step
Facing a similar constraint?
Tell us where the legacy system is holding you back. We will tell you honestly whether a rebuild, a strangler migration or a targeted fix is the right answer.
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