* Appointed Sr. Manager to lead the Audience and Identity team at Freewheel post the acquisition of Beeswax, tasked with rebuilding the team after the original members departed. Successfully assembled a diverse team of 7 engineers located across the United States, Ukraine, and Brazil, balancing on-site and remote collaboration.* Assumed dual responsibilities as a Sr. Manager and Lead Software Engineer, quickly mastering and overseeing a dozen components from the acquired startup, encompassing Python, AWS, Kubernetes, and Bazel technologies.* Guided the team in managing the ingestion of approximately 15TB of raw audience data into Aerospike and Snowflake, along with processing and integrating identity graphs from various vendors.* Led a major project to develop a new, more efficient audience and identity ingestion pipeline, replacing the legacy system of Freewheel. Leveraged insights from Beeswax to construct a scalable, reliable, and cost-efficient solution on Kubernetes, capable of handling both Freewheel and Beeswax data through a unified pipeline.* Successfully delivered the new system in 10 months, directly enhancing campaign delivery performance by populating Aerospike in real-time.

* Integrated into Freewheel’s US data team as a Lead Software Engineer, playing a key role in advanced data aggregation and processing projects.* Developed a serverless data aggregation pipeline on AWS/Databricks, efficiently processing terabytes of data to produce theta sketches for rapid audience cardinality estimation.* Utilized and rapidly mastered a broad range of technologies, including Spark, Scala, Apache Datasketches, Terraform, AWS StepFunctions, Lambda, and ECS.* Achieved sub-millisecond estimation times for audience cardinality through innovative use of theta sketches (Apache Datasketches), optimizing the speed and efficiency of data analysis.

* Promoted to Manager at StickyADS.tv during a pivotal period, leading up to the company’s successful acquisition by Freewheel, a Comcast company.* Assembled and led a diverse team comprising a data scientist, a senior engineer, and a software engineer, focusing on the development and operation of large-scale backend systems.* Managed the ingestion and pre-aggregation of over 300 million events per day, introducing a Kafka-based system for raw log exports to customers and enhancing data aggregation capabilities.* Played a key role in the integration process with Freewheel, traveling to New York City and Beijing to collaborate with Chinese engineers for a smooth project handover.* Navigated a challenging period during the closure of the French engineering office; accepted an offer to relocate to New York City, demonstrating adaptability and commitment amidst organizational changes.

* Led the JAVA log ingestion project at StickyADS.tv, transitioning data storage from MySQL to MongoDB, optimizing data schema, and implementing efficient sharding and aggregation strategies.* Engineered a 10x scale increase of the ingestion pipeline to support 20 billion daily auctions, integrating Kafka for enhanced throughput and scalability.* Drove performance and data health improvements through the introduction of in-memory caching, Protobuf migration, and systematic JVM tuning.* Innovated unique data counting by implementing HyperLogLog, reducing MongoDB collections from thousands to one, significantly cutting operational costs.

* Joined StickyADS.tv as the third engineer directly under the CTO during the startup's initial growth phase post first-round funding, playing a pivotal role in shaping the technology stack.* Developed and optimized key features for the SSP web platform, including a CPV campaign configuration interface and advanced reporting tools, employing PHP, AJAX, JavaScript, and MongoDB.* Crafted and enhanced interactive data visualizations using JavaScript libraries, creating a dynamic world map to display campaign statistics, which significantly improved analytical insights and user engagement.* Directed the strategic migration of the time series database from MySQL to MongoDB, significantly enhancing performance and scalability, and deeply engaged with MongoDB's map-reduce functionalities to streamline data operations.

* Initiated and led the successful development of the banking module for Free Mobile's website backend, utilizing JAVA / JEE, ahead of the company's highly anticipated market entry as the fourth national mobile provider.* Executed seamless integration for comprehensive payment processing, including credit card, bank transfers, and installment plans, enhancing customer payment options while ensuring transaction security.* Distinguished for technical proficiency and resilience; solely retained after launch to optimize the banking module, underpinning critical payment operations during pivotal company growth.* Transitioned to a new role after 12 months to pursue professional development opportunities, reflecting a proactive approach to career advancement and skill enhancement.