Data Masking at Scale: Implementing IBM Optim Functions with Spring Boot
Why Data Masking Matters More Than Ever
In the age of AI, your training data is only as safe as your masking layer. Exposing PII in enterprise data pipelines — even internally — is a compliance and security risk. IBM Infosphere Optim solves this, but its script generation was entirely manual.
The Intellisphere Project
On the IBM Optim Modernization project, I rebuilt the Access Definition (AD) Script Generator backend from scratch. The goal: generate valid Optim scripts programmatically so engineers never had to hand-write them.
The Architecture
User configures fields in UI (Next.js)
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Spring Boot REST API
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Velocity Engine (template rendering)
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Generated Optim script
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Imported into IBM Optim Classic (validated)
7 Data Masking Functions Implemented
| Function | Purpose |
|---|---|
| Age | Randomize age within a realistic range |
| Seq | Sequential numeric replacement |
| Shuffle | Shuffle column values across rows |
| Substring | Partial data extraction/replacement |
| TRANS_EML | Email address transformation |
| RAND_LOOKUP | Random value from lookup table |
| HASH_LOOKUP | Hash-based deterministic lookup |
Each function was implemented, merged, and regression-tested against real Optim imports.
Redis Caching for Performance
To speed up repeated script generation requests, I added Spring Boot Redis caching using RedisTemplate. I also led a team knowledge-sharing session on this — turning a personal implementation into team-wide competency.
Testing & Quality
- JUnit + Mockito for backend unit tests
- Jest for the Next.js LMS application
- SonarQube compliance enforced throughout
Key Insight
Velocity Engine is a powerful but underused tool for template-driven code generation. Pairing it with a Spring Boot API and a UI config layer creates a self-service script factory — no Optim expertise required from end users.
Conclusion
Data masking is foundational infrastructure for responsible AI. Building it well means your downstream models, reports, and integrations never touch real PII.