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Principal Software Engineer - Core GenAI Platform

Upstart

$186,100 - $257,500
Oct 3, 2025
Remote, US
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Upstart is looking to build a foundational infrastructure for generative AI across the company to enable the safe, efficient, and responsible use of LLMs across all business domains.

Requirements

  • 10+ years of professional software engineering experience, with at least 3 years leading large-scale, cross-team technical initiatives
  • Proven track record of delivering complex, distributed systems and platform infrastructure that span multiple teams
  • Deep expertise in backend systems and infrastructure technologies such as Kubernetes, Docker, Terraform, and cloud-native architectures
  • Experience designing and operationalizing ML/LLM platforms at scale, including optimization for cost, latency, and reliability
  • Demonstrated ability to set long-term technical direction and influence organizational strategy
  • Full-stack engineering experience (Python, FastAPI, Kotlin, Spring, React/TypeScript, or similar)
  • Expertise in LLM-specific infrastructure such as inference optimization (quantization, ONNX, streaming), retrieval-augmented generation, and vector databases

Responsibilities

  • Define and drive the multi-year technical roadmap for the Core GenAI Platform, influencing adoption and alignment across several engineering teams
  • Lead architecture and design of large-scale, mission-critical systems for model inference, orchestration, and compliance
  • Identify and solve systemic technical risks that impact multiple teams and business-critical AI initiatives
  • Build high-leverage, generalizable platform components that meaningfully accelerate the productivity of engineers across Upstart
  • Mentor senior engineers (L5) and shape the growth of future technical leaders, fostering a culture of learning and excellence
  • Collaborate with VP-level and above leadership to influence business strategy with technical insight
  • Establish operational standards for GenAI integrations, ensuring security, fairness, and reliability at scale

Other

  • Provide technical leadership across multiple cross-functional teams
  • Work closely with engineering leaders, ML researchers, and product stakeholders
  • Represent Upstart internally and externally as a thought leader in GenAI systems through executive reviews, cross-company forums, and industry venues
  • Excellent communication skills with a history of driving alignment across engineering and business stakeholders
  • Recognized as a technical leader beyond your immediate team, influencing platform strategy across organizations