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Database Management Systems
Technical Knowledge Advanced 4 years experience

Summary#

Experienced database developer skilled in relational database design, query optimization, and secure data access. Achieved 75% query runtime improvement through B+ tree indexing.

How I Apply This Skill#

  • Designed database schemas using ER/EER diagrams before implementation
  • Achieved 75% query runtime improvement through B+ tree indexing (with 316% storage tradeoff)
  • Secured databases with parameterized queries preventing SQL injection across Python, Java, and PHP
  • Designed ACID-compliant databses for consulting clients
  • Created comprehensive test suites including positive/negative, whitebox, and blackbox testing
  • Managed PostgreSQL on Synology NAS for the Job Search Agent, persisting 58,807 weekly job postings with per-user application tracking across 13 states and company metadata for 1,975 entries
  • Generated and validated T-SQL queries against a 90.5M-row MS SQL Server database for the Text-to-SQL dashboards, with 14 prompt rules, 7 post-processing fixes, and a 7-point security validation layer achieving 100% SQL success rate
  • Used SQLite for append-only analytics logging in the RAG Document Assistant, tracking query volume, result counts, latency, and source clicks with zero-result gap analysis

Key Strengths#

  • Database Systems: PostgreSQL, MSSQL, MySQL, SQLite
  • Schema Design: ER/EER diagrams, normalization, relationship modeling
  • Query Optimization: Indexing, execution plans, performance benchmarking
  • Security: Parameterized queries, input validation, prepared statements
  • Testing: integration testing, data integrity verification
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