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Rayan Heider

@rayanheider

Oracle APEX and PL/SQL developer who delivered production web applications at merlin.zwo InfoDesign GmbH & Co. KG, from requirements to release.

Germany

Message

At merlin.zwo InfoDesign GmbH & Co. KG, I designed and built data-centric web applications in Oracle APEX, taking them from business requirements through production release. I also wrote and tuned PL/SQL and SQL, and built ETL routines and REST interfaces connecting applications to surrounding systems.

On a paid remote contract with HudHud Maps, I developed and optimized PL/SQL database solutions. Earlier, at DZ Service GmbH, I supported approximately 200 users, administered Active Directory and Microsoft 365, and built an internal knowledge base. My projects include an Oracle PL/SQL order-to-cash demo and a Python data pipeline.

Experience

Work history, roles, and key accomplishments

PL/SQL Developer

HudHud Maps

Jan 2026 - Apr 2026 (3 months)

Developed and optimized PL/SQL database solutions on a paid remote contract.

Pl SQL Oracle Database SQL Database Development

Software Developer – Oracle APEX / PL/SQL

merlin.zwo InfoDesign GmbH & Co. KG

Nov 2022 - Mar 2025 (2 years 4 months)

Designed and built data-centric web applications in Oracle APEX on Oracle Database, from requirements gathering to production release. Wrote and tuned PL/SQL packages, procedures, and complex SQL, and built ETL routines and REST interfaces.

Oracle APEX Pl SQL SQL Oracle Database ETL REST Bulk Collect FORALL Cursor Exception Handling Technical Documentation Requirements Analysis Agile Scrum

IT Coordinator & 1st/2nd-Level Support

DZ Service GmbH

Mar 2020 - Jan 2022 (1 year 10 months)

First point of contact for approximately 200 users, handling incident logging, categorization, and prioritization. Administered Active Directory and Microsoft 365, coordinated procurement and rollouts, and maintained the internal knowledge base.