DoorDash Engineering Blog

Learn how we built a real-time rules engine to fight fraud at scale, enabling fast, safe decisions in latency-sensitive systems. careersatdoordash.com/blog/doordash-…

How do you improve search and ads across millions of products? In our latest blog, we share what we learned building a multimodal AI framework that better understands products and customer intent. careersatdoordash.com/blog/doordash-…

Proud to have been a part of this effort! PLUS shows that optimized user summaries outperform vector embeddings and ICL for personalization and better align LLMs to real user diversity. This is one of the core ideas we’re exploring at DoorDash to drive AI-powered personalization.

Scaling globally isn’t easy. Learn how we rebuilt Dasher onboarding into a modular platform to launch new markets faster with localized, consistent experiences. careersatdoordash.com/blog/doordash-…

How do you test a non-deterministic chatbot? Using a simulator & evaluation flywheel, our offline chatbot testing that simulate real users. careersatdoordash.com/blog/doordash-…

DoorDash tackled mobile app size growth with targeted optimizations, tooling, and monitoring - keeping apps fast as features and teams scale. careersatdoordash.com/blog/doordash-…

Meet our new Multi-Armed Bandit platform: adaptive experiments that auto-optimize traffic, reduce regret, and boost learning faster than fixed A/B tests. careersatdoordash.com/blog/experimen…

At DoorDash, GenAI powers a smarter, more personalized shopping journey. Our new dynamic carousels deliver tailored recommendations for every user. careersatdoordash.com/blog/doordashs…

From scattered data to shared intelligence, our agentic AI platform unifies knowledge across internal documentation, dashboards & chats. careersatdoordash.com/blog/beyond-si…

How DoorDash enhanced its in-house search engine by crushing latency spikes, boosting efficiency, and unlocking system-level performance gains careersatdoordash.com/blog/doordash-…

Keeping conversations safe with AI. Read how DoorDash built SafeChat to protect millions of chats, images & calls every day careersatdoordash.com/blog/doordash-…

Slow builds? We fixed that. Watch our new Tech Talk on how DoorDash sped up web dev build times youtu.be/QL2UVLJxQp8?si…

See how DoorDash cut CI times in our web monorepo by 75%, saving 500+ engineer hours every month - boosting developer velocity and productivity. careersatdoordash.com/blog/how-doord…

At DoorDash, we used restaurant order history + LLMs to solve the cold start problem, powering personalized grocery & convenience recommendations. careersatdoordash.com/blog/doordash-…

Classic A/B tests break in marketplaces. DoorDash Ads built a budget framework that isolates spend, delivering unbiased results and faster insights. careersatdoordash.com/blog/doordash-…

Fraud rarely shouts - it hides in the noise of data. Learn how DoorDash built an anomaly detection platform that surfaces fraud trends within a few days. careersatdoordash.com/blog/doordash-…

At DoorDash, we scaled our support chatbot using LLMs + clustering to transform user-generated content into high-impact knowledge base articles in minutes. careersatdoordash.com/blog/doordash-…

Learn how DoorDash uses LLMs to generate consumer, merchant & item profiles at scale - boosting personalization, explainability & analytics. careersatdoordash.com/blog/doordash-…

Learn how we built an AI tool that generates menu descriptions, enabling small restaurants to boost online visibility and focus on what they do best🍽️ careersatdoordash.com/blog/doordash-…

Here’s how we built a service mesh from the ground up, migrated 1,000+ microservices, tackled major challenges, and what we learned along the way. careersatdoordash.com/blog/inside-do…