Continuing my work started at Rubicon Project, working as the primary developer of Marketplace API (Java 17, Spring Boot, Hibernate, Jackson, MySQL, RabbitMQ, SendGrid) that supports the following features:

• Automation of business workflows for buyers and sellers of advertising inventory

• Integration with ad delivery system

• Automated email notifications for business users

Other responsibilities:

• Heavily participating in project planning, discussing and reviewing product requirements

• Providing guidance to other developers and promoting good engineering practices

Worked as the primary developer of Orders Server (Java 8/11, Spring, Hibernate, MySQL) that provided workflows for business users, representing buyers and sellers of advertising inventory.

Other responsibilities:

• Worked closely with product management to ensure that product requirements were clear, complete and kept up to date.

• Worked closely with UI developers to ensure that the API is sufficient to build required user experience.

• Heavily influenced the rest of the team, leading by example and promoting good engineering practices.

Participated in development of a Real-Time Bidding / Ad Serving Platform (Java, Spring, Jersey, memcached, Velocity). Personally owned the following components:

• Integrations with RTB networks (such as Doubleclick, AppNexus, Pubmatic).

• Ad server configuration management (campaigns, networks, creatives).

• Dynamic, real-time control of delivery (budget and impression caps, pacing, dayparting).

• Campaign / creative selection algorithms, for bidding.

• Event tracking (bid requests, impressions, engagements ,clicks, page views, conversions).

Other responsibilities:

• Owned AdOps Content Management System (Java, Spring, Hibernate, Oracle, VAADIN).

• Developed data processing utilities (Java, Spring, Hibernate, Oracle, MySQL): migrating configuration from legacy system to the new DB schema, text mining client product catalogs, etc.

• Developed multiple features for Product Recommendation platform (Java, Spring, Hibernate, Oracle), including support for A/B tests across multiple channels (Web, Email, Ads).

Participated in development of ad server (Java, Spring, Hibernate, Oracle) and related components.

Participated in development of Cognos On-Demand BI (Java/EJB, MySQL), that had later become IBM Cognos Real-Time Monitoring:

• Re-engineered metadata (configuration) layer: improved referential integrity and eliminated causes of frequent data corruptions, while maintaining compatibility with existing applications.

• Investigated and fixed multiple race conditions and deadlocks.

• Refactored many areas of the code, and improved architecture of the system.