I build Java/Spring backend systems where correctness, explicit contracts, and actionable diagnostics matter—especially document processing, PDF analysis, and services that integrate multiple data sources.

Selected systems

PDF Text Layer Auditor A Java 21 CLI that catches missing or suspicious native PDF text layers before they disrupt search, copy/paste, indexing, accessibility workflows, or downstream extraction. Evidence: GitHub Marketplace Action · page-level diagnostics · versioned JSON · signed releases Repository · Marketplace · Latest release

User Aggregation Service A Java 21 and Spring Boot 3.5 service that exposes one validated REST API over PostgreSQL and MongoDB user data. Evidence: bounded concurrent aggregation · Caffeine caching · Flyway · OpenAPI · Docker Compose Repository · Latest release

Core capabilities

Backend Java 21 · Spring Boot · REST · Hibernate	Documents PDFBox · text layers · validation · extraction
Data PostgreSQL · MongoDB · JPA · caching	Delivery Maven · Docker · JUnit · GitHub Actions

Selected full-stack work: React · TypeScript

Open-source record

77 public pull requests

66 merged

Broadleaf Commerce earlier public contributions

Those contributions were made through my former work account, putrenkov, which is retained for historical attribution. lMysticl is my current GitHub profile.

• Historical order purge — retention safety, extensibility, and MySQL/PostgreSQL compatibility
• Domain equality and serialization invariants — regression coverage across the domain model
• Multi-catalog persistence fix — a major persistence defect validated through review