You will join a small, high-leverage team building production infrastructure for Generative AI at DoorDash. You'll work across backend services, ML infrastructure, agent/tool orchestration, evaluation systems, model serving, batch inference, and observability. This role is ideal for an engineer who enjoys building reliable platform primitives in a fast-moving technical area where product needs, model capabilities, vendor ecosystems, and cost/performance tradeoffs are evolving quickly. You're excited about this opportunity because you will... • Build the infrastructure that helps DoorDash teams move GenAI ideas from prototype to production, increasing the velocity of business impact from AI across the company. • Work on production GenAI platform surfaces including the LLM Gateway, Agent Gateway, evals infrastructure, open-weights model serving, batch inference, fine-tuning, guardrails, and cost attribution. • Design scalable systems for AI agents, MCP/tool orchestration, retrieval, batch inference, model serving, and evaluation workflows that power real customer and internal automation use cases • Help product teams choose the right model and vendor strategy across closed-source and open-weight models, with reliability, fallback, observability, and cost controls built in. • Build platforms that support rapid experimentation while meeting production standards for latency, scale, monitoring, SLOs, playbooks, and operational excellence. • Partner closely with ML engineers, product engineers, data scientists, and platform teams across DoorDash, Wolt, and Deliveroo to turn emerging GenAI capabilities into durable platform primitives. • Shape the future of DoorDash's centralized GenAI platform, enabling the next generation of AI-powered products, agents, automation, and personalization. We're excited about you because... • B.S., M.S., or PhD. in Computer Science or equivalent • 4+ years of industry experience in software engineering • Strong backend engineering fundamentals, especially in Python and distributed systems. • Experience building production services, APIs, data pipelines, or ML infrastructure at scale. • Experience operating systems in production, including observability, debugging, reliability, incident response, and performance/cost optimization. • Familiarity with machine learning workflows such as inference, evaluation, feature/data pipelines, model serving, or experimentation. • Ability to work across ambiguous, fast-moving technical areas and turn customer use cases into reusable platform capabilities Nice To Haves • Experience fine-tuning and serving open-weights LLMs in production • Experience building and deploying AI agents in production • Experience building and deploying MCP servers in production • Experience with LLM gateways, model routing, vendor abstraction, or cost attribution • Experience with eval systems, LLM observability, tracing, or LLM-as-judge workflows • Experience with RAG, search, vector databases, or retrieval pipelines • Experience with Kubernetes, cloud infrastructure (AWS/GCP), GPUs, or high-throughput batch systems • Experience building developer platforms, internal platforms, or self-serve infrastructure Compensation The successful candidate's starting pay will fall within the pay range listed below and is determined based on job-related factors including, but not limited to, skills, experience, qualifications, work location, and market conditions. Base salary is localized according to an employee's work location. Ranges are market-dependent and may be modified in the future. In addition to base salary, the compensation for this role includes opportunities for equity grants. Talk to your recruiter for more information. DoorDash cares about you and your overall well-being. That's why we offer a comprehensive benefits package to all regular employees, which includes a 401(k) plan with employer matching, 16 weeks of paid parental leave, wellness benefits, commuter benefits match, paid time off and paid sick leave in compliance with applicable laws (e.g. Colorado Healthy Families and Workplaces Act). DoorDash also offers medical, dental, and vision benefits, 11 paid holidays, disability and basic life insurance, family-forming assistance, and a mental health program, among others. To learn more about our benefits, visit our careers page here. See below for paid time off details: • For salaried roles: flexible paid time off/vacation, plus 80 hours of paid sick time per year. • For hourly roles: vacation accrued at about 1 hour for every 25.97 hours worked (e.g. about 6.7 hours/month if working 40 hours/week; about 3.4 hours/month if working 20 hours/week), and paid sick time accrued at 1 hour for every 30 hours worked (e.g. about 5.8 hours/month if working 40 hours/week; about 2.9 hours/month if working 20 hours/week). The national base pay range for this position within the United States, including Illinois and Colorado. $137,100-$201,600 USD