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Upstart

Our mission is to enable effortless credit based on true risk.

Senior Software Engineer, LLMs

Full-stack EngineerSoftware EngineerOtherRemoteSeniorTeam 1,001-5,000Since 2012H1B SponsorCompany SiteLinkedIn

Location

United States

Posted

104 days ago

Salary

$167.7K - $231.8K / year

Seniority

Senior

Job Description

Senior Software Engineer, LLMs

Upstart

• Design and build user-facing ML features that harness LLMs and generative AI to unlock new product capabilities • Partner with product, design, and ML research to prototype and deliver high-impact, ML-powered experiences • Own the technical architecture and implementation strategy for applied ML systems - balancing latency, observability, and iteration speed • Build scalable services and APIs that bring model outputs to users in trustworthy and intuitive ways • Collaborate across platform, infra, and legal/compliance teams to ensure ML deployments meet standards for safety, fairness, and performance • Establish and evangelize best practices for prompt design, model evaluation, and experimentation across the org

Job Requirements

  • 4+ years of software engineering experience, with 2+ years working directly on ML-driven products or intelligent systems
  • Proven ability to lead complex initiatives across engineering, product, and research stakeholders
  • Strong backend development skills (e.g., Python with FastAPI or Flask), plus experience with cloud-native tooling (e.g., Kubernetes, Docker, Terraform)
  • Experience integrating LLMs or ML models into production systems, including APIs and user-facing applications
  • Excellent communication skills and a collaborative, product-minded approach
  • Ability to think rigorously about system design, latency tradeoffs, and user impact when working with ML features
  • Experience shipping GenAI or LLM-powered features using frameworks like LangChain, LlamaIndex, or OpenAI APIs
  • Familiarity with retrieval-augmented generation (RAG), vector search (e.g., FAISS, Pinecone), and real-time inference patterns
  • Proficiency in full-stack development, including front-end work with React or similar frameworks
  • Strong intuition for prompt engineering, model testing, and evaluation methodologies
  • Experience navigating complex requirements around explainability, user trust, or compliance in ML applications
  • Track record of influencing architecture or product direction at a team or org level

Benefits

  • Competitive compensation, including base pay, bonus opportunities, and annual equity grants that vest quarterly
  • Generous 401(k) plan with Upstart matching $2 for every $1 contributed, up to $15,000 per year
  • Employee Stock Purchase Plan (ESPP) with discounted stock purchase options for eligible employees
  • Affordable medical, dental, and vision coverage, with multiple plan options - Upstart covers 90% to 100% of the cost depending on the plans you choose
  • Health Savings Account contributions from Upstart for eligible plans
  • Income protection benefits, including company-paid Basic Life, AD&D, and Short- and Long-Term Disability coverage, with options to purchase supplemental coverage
  • Paid time off, sick and safe time, and company holidays
  • Paid family and parental leave to support caregiving and major life moments
  • Family-centered benefits through Carrot and Cleo, supporting fertility, parenthood, and caregiving
  • Employee Assistance Program (EAP) offering mental health support and life-centered resources
  • Financial wellness resources, including access to financial planning tools and a financial concierge service
  • Annual wellness allowance to support your physical and emotional well-being and personal development, based on what matters most to you
  • Annual productivity allowance to invest in relevant tools and resources you need to do your best work, no matter where you work from
  • Connection and community through team events and onsites, all-company updates, and employee resource groups (ERGs)
  • Onsite perks, including catered lunches and fully stocked micro-kitchens when working from one of our four offices, located in the Bay Area, Austin, Columbus, and New York City (opening Summer 2026!).

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