Developed features for a data verification software platform.

* Implemented critical business logic for user data validation and processing.

* Significantly boosted application performance by optimizing database queries and interactions.

* Enhanced system reliability by identifying and resolving critical data inconsistency bugs and memory leaks.

Led a team of 5 backend developers in the design, development, and maintenance of critical software solutions.

* Spearheaded the development of KyivID (id.kyivcity.gov.ua), a centralized OAuth 2.0 authorization server providing single sign-on (SSO) for municipal services used by Kyiv citizens.

* Engineered a dynamic data integration platform to unify and normalize records from diverse Ukrainian national registries into a single, configurable format.

* Built a multi-tenant SaaS CMS platform with features like comments, voting, and likes to accelerate the deployment of internal company projects.

* Executed complex data migrations between major application versions with significant schema changes while ensuring data integrity.

* Optimized application performance through systematic tuning and bottleneck analysis.

* Contributed to the development of the Municipal Registry and the next-generation Child Registry, while also providing production support for the existing version.