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I'm Oleh Kovtaniuk, a Senior PL/SQL Developer with a strong focus on Oracle database engineering, complex PL/SQL package development, and query performance optimization. I have experience delivering high-performance database solutions in large-scale enterprise environments and enjoy designing robust data models, tuning queries, and collaborating with cross-functional teams to meet business goals. Beyond database work, I bring full-stack capabilities in C# and REST API development, and I have hands-on experience with Oracle APEX, VBA, and cross-platform mobile app development. I value mentoring junior developers, contributing to technical architecture decisions, and driving end-to-end product ownership.…I'm Oleh Kovtaniuk, a Senior PL/SQL Developer with a strong focus on Oracle database engineering, complex PL/SQL package development, and query performance optimization. I have experience delivering high-performance database solutions in large-scale enterprise environments and enjoy designing robust data models, tuning queries, and collaborating with cross-functional teams to meet business goals. Beyond database work, I bring full-stack capabilities in C# and REST API development, and I have hands-on experience with Oracle APEX, VBA, and cross-platform mobile app development. I value mentoring junior developers, contributing to technical architecture decisions, and driving end-to-end product ownership.

Oleh Kovtaniuk

Full Stack Developer, Web Developer, Programmer, +2

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I'm Oleh Kovtaniuk, a Senior PL/SQL Developer with a strong focus on Oracle database engineering, complex PL/SQL package development, and query performance optimization. I have experience delivering high-performance database solutions in large-scale enterprise environments and enjoy designing robust data models, tuning queries, and collaborating with cross-functional teams to meet business goals. Beyond database work, I bring full-stack capabilities in C# and REST API development, and I have hands-on experience with Oracle APEX, VBA, and cross-platform mobile app development. I value mentoring junior developers, contributing to technical architecture decisions, and driving end-to-end product ownership.…I'm Oleh Kovtaniuk, a Senior PL/SQL Developer with a strong focus on Oracle database engineering, complex PL/SQL package development, and query performance optimization. I have experience delivering high-performance database solutions in large-scale enterprise environments and enjoy designing robust data models, tuning queries, and collaborating with cross-functional teams to meet business goals. Beyond database work, I bring full-stack capabilities in C# and REST API development, and I have hands-on experience with Oracle APEX, VBA, and cross-platform mobile app development. I value mentoring junior developers, contributing to technical architecture decisions, and driving end-to-end product ownership.

Available to hire

I’m Oleh Kovtaniuk, a Senior PL/SQL Developer with a strong focus on Oracle database engineering, complex PL/SQL package development, and query performance optimization. I have experience delivering high-performance database solutions in large-scale enterprise environments and enjoy designing robust data models, tuning queries, and collaborating with cross-functional teams to meet business goals.
Beyond database work, I bring full-stack capabilities in C# and REST API development, and I have hands-on experience with Oracle APEX, VBA, and cross-platform mobile app development. I value mentoring junior developers, contributing to technical architecture decisions, and driving end-to-end product ownership.

Skills

Experience Level

Expert

Expert

Expert

Expert

Language

Ukrainian

Fluent

Russian

Fluent

English

Advanced

Spanish; Castilian

Beginner

Work Experience

Senior Software Engineer | PL/SQL Developer at GlobalLogic Ukraine (part of Hitachi Group)

November 1, 2021 - Present

Designed and developed complex Oracle PL/SQL packages, stored procedures, triggers, and functions using advanced features: Bulk COLLECT/FORALL, Dynamic SQL, Ref Cursors, and Pipelined Functions. Performed query performance tuning with EXPLAIN PLAN, index optimization strategies, and SQL hints to ensure system responsiveness under high data load. Designed and implemented database schemas and data models aligned with business and performance requirements. Conducted code reviews, mentored junior developers on PL/SQL development standards and debugging techniques, and contributed to architectural discussions. Developed Oracle APEX applications from scratch (interactive grids, forms, reports, dashboards), implemented dynamic actions, custom plugins, and JavaScript integrations. Configured REST Web Sources and REST services for back-end integration and built RESTful APIs for component communication. Maintained and modernized VBA-based report templates.

MS SQL Developer at SkyUp Airlines

July 1, 2021 - November 1, 2021

Provided support and troubleshooting for internal SQL Server-based systems. Created and optimized database objects (tables, views, stored procedures) and developed an automated email notification system for clients. Implemented feature enhancements aligned with business requirements.

SQL Developer at Right and Above

February 1, 2021 - July 1, 2021

Developed PL/pgSQL procedures and database objects. Delivered ongoing production support and troubleshooting, participated in weekly client meetings, and contributed to requirements discussions. Implemented new feature enhancements based on business needs, including the design of a database audit service to monitor and report on data growth trends.

Chief Executive Officer at LLC UKRECOSERVICE

April 1, 2019 - February 1, 2021

Led and managed a company specializing in recycling and disposal of hazardous waste products. Responsible for operational management, team leadership, client relations, and business development, driving strategic initiatives and ensuring compliance with industry standards.

Independent Developer at QuestGen - Cross-Platform Mobile Application

January 1, 2025 - Present

Independently designed, developed, and published a cross-platform mobile application from concept to production. Led UX design, development, testing, and deployment, resulting in availability on App Store and Google Play. Demonstrated full product ownership across the entire lifecycle.