Sebastian Medina Krumholz Email & Phone Number

Madrid, Es

Madrid, Community Of Madrid, Spain

• Reduced daily infrastructure costs by 13% by identifying non-performing traffic segments and implementing ad request throttling.• Improved the revenue forecasting system - elevating attainment from 70% to a consistent 90%+ - by automating the company’s forecast using Regression Models.• Increased in-app-purchase revenue by 22% increase by conducting an A/B test after identifying an opportunity that consisted on optimizing cost allocation across predicted deciles within a ML model.• Developed a significance testing tool in Python for A/B testing, now widely adopted by the Data Science team to inform critical decision-making for experimental analysis.• Conducted bi-weekly revenue status presentations for the executive leadership and product teams, delivering clear insights into key metrics and guiding strategic growth and improvement initiatives for the company.

Madrid, Community Of Madrid, Spain

• Increased daily supply margin by 5% by leveraging a K-means clustering model to segment apps based on bid price & number of auctions. Utilizing this insight, the Ops team adjusted bid floors per segment resulting in enhanced revenue generation.• Increased show rate by 8% by discovering a negative relationship between creative asset size and show rate. This opportunity was used to prioritize assets with lower asset sizes in a real-time creative selection system.• Mentored a team of 4 members as the team’s technical lead; and conducted comprehensive company-wide trainings covering industry economics, SQL, data analysis, and programming in Python.

Madrid, Community Of Madrid, Spain

• Increased demand gross revenue by 3% QoQ by identifying an operational inefficiency related to budgets, and implemented a Python automation for adjusting budgets based on campaign performance.• Saved 10+ hours of weekly campaign health monitoring by building a bot – with Python & Asana’s APIs – that would trigger alerts with actionable tasks for the Ops team to optimize campaigns in a critical state.• Increased goal attainment for new campaigns from 30% to 70% in 2 weeks of onboarding by building a full-stack overbid tool in JavaScript, facilitating precise dimension targeting for enhanced performance and accelerating the training process of ML models.

Amsterdam Area, Netherlands

• Contributed to the company’s successful acquisition by Zynga by playing a pivotal role in scaling the DSP program from 20 to 300+ apps, driving revenue growth QoQ through campaign management and optimization strategies.• Spearheaded the creation of data reporting infrastructure from scratch by using SQL & Tableau. Created & maintained 30+ crucial dashboards that provided informed decisions to optimize campaign performance and increase net revenue.• Acted as liaison between business & engineering teams to refine the product and incorporate features based on data insights & client demands.• Held revenue investigations that led to discovery of bugs & improvements to mitigate future risks• Built a ticket manager via a chrome extension (with Javascript) for the business team to send campaign-specific requests.• Built optimization tools via a chrome extension that hit the DSP’s APIs (with Javascript & Python) to adjust ad targeting budgets (to improve revenue) and bid thresholds (to acquire IAPs) which led to a significant decrease in operational time.

Amsterdam Area, Netherlands

Chartboost is mobile game monetization platform, acting as a business engine, and allowing game developers to create customized interstitial/video ads, promote games, swap traffic with one another, and achieve ROI goals. Several tasks I conducted, include: • Creating advertising campaigns, app callback set-ups & testing server-to-server (S2S) - 3rd party integrations • Recurring & customized KPI performance reports for AMs & accounts • Bulk editing campaigns, uploading creatives and targeting with manipulation of data • Setting & documenting the reporting process for the team by understanding CB’s system database, creating SQL queries, designing excel macros, and automating scheduled tickets • Analyses to identify broken S2S integrations and troubleshooting to improve our network health • Project owner of global quarterly business reviews for our main clients. I designed automated presentation slides with queries & templates for AMs to give their presentations

Amsterdam Area, Netherlands

Bynder is a cloud-based platform where marketing teams can create, find and use digital content. The Operations team helped scale up the organization by providing end-to-end solutions to other departments and measuring to improve. Several tasks I conducted, include: • Improving data quality, documenting business processes, techniques and procedures regarding Salesforce and other analytical tools.• Cohort analyses & reporting for the Sales & Customer Success team.• Statistical reports on customer satisfaction and adoption of Bynder’s platform through Net Promoter Scores and frequency of FAQs.• Reporting the Product’s team efficiency by measuring committed to delivered story points in Jira.• Lead distribution for marketing campaigns, and license distribution for product integrations.• Tracking the tech stack (the number of tools used and how they are inter-connected between departments) to optimize costs.• Creating automated contracts in Salesforce at a click of a button, through Conga Composer (by linking populated fields in SF and manipulating a template with tables, conditional statements, and formulas).

Guayaquil, Ecuador

Balsa-wood manufacturing company• Exports Department, full-time employee• Direct contact with shipping companies for exports• In charge of the customs export declaration of the company and TPG (Port of Guayaquil) documents for the approval of containers• Time management for cargo outbound

Bsc International Business Administration (Iba), International Business

Education record

College Algebra, Pre-calculus, Calculus, Statistics, Macroeconomics, Accounting I, Accounting II

High School