Paddy Yoosin
Senior Software Engineer @DoorDash
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WORK HISTORY
Senior Software Engineer @DoorDash
Toronto, ON, CA
Contributed to marketplace and logistics systems at DoorDash, with a focus on financial incentives, courier compliance, and operational reliability. Shipped improvements in programs that directly impact delivery performance and customer experience.Key WorkPizza Delivery Incentives Program — enhanced backend logic and workflows to ensure eligible Dashers receive performance-based incentives for pizza delivery quality and speedPizza Bag Return Workflow — built and improved backend flows that validate bag returns, reduce fraud, and support compliance tracking for pizza merchants and DashersImpactReduced false incentive payouts + improved detection for invalid incentive claimsIncreased compliance accuracy for bag returns and protected incentive budgetImproved monitoring, logging, and error handling across incentive servicesDelivered changes safely through feature flags and incremental rollout strategyTechKotlin, Java, Spring Boot, gRPC/REST, AWS, Kafka, Kubernetes, Datadog, Feature Flags
EDUCATION
Murang'a University of Technology
Barchelors , Computer Software Engineering
ABOUT PADDY YOOSIN
I build high-reliability backend systems for real-time marketplaces and logistics platforms. Currently at ACV Auctions, working on the auction platform powering thousands of live auctions and high-frequency bidding events every day.I focus on-Real-time distributed systems (Kotlin/Java, Spring)-Event-driven architecture & stream processing (Kafka)-Low-latency bidding and state synchronization-Production reliability, observability, and fault tolerance-Secure, scalable cloud services (AWS, Kubernetes)Recent work at ACV-Improving reliability and performance across bidding pipelines and auction lifecycle flows-Feature-flag driven rollouts & safe migration paths for critical auction services-Enhancing observability using Datadog, BigQuery, and distributed tracing-Reducing operational noise and tightening monitoring SLAs for auction-critical componentsPast roles include engineering for DoorDash and Intuit, supporting high-volume consumer platforms (100M+ user scale) and building production systems across payments, logistics, and tax domains.I also build fast MVPs through my product studio, helping founders launch real products quickly without sacrificing engineering fundamentals.Strengths-High-frequency event systems-Marketplace/auction & logistics platforms-Fault-tolerant backend engineering-Senior-level debugging + production operations-MVP execution speed with enterprise-grade disciplineI love solving hard, high-leverage engineering problems that require deep understanding of systems, not just writing code.Always open to conversations about distributed systems, marketplaces, MVP builds, and engineering leadership.
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