Software Engineer - LLM Systems About NewtonXNewtonX is a B2B insights company trusted by the world's most innovative companies to make high-stakes decisions with confidence. We combine a verified network of business professionals with AI-powered research tools to deliver research intelligence faster, more precise, and more defensible than traditional methods.Our clients include Google, Microsoft, TikTok, DoorDash, Stripe, and Coinbase. Our research has been cited by Fortune, Forbes, TechCrunch, Adweek, and the Wall Street Journal.NewtonX has raised $47M from investors including Two Sigma Ventures, Third Prime, XFund, and Citi Ventures.About The RoleIn this role, you'll own the core LLM infrastructure powering two products redefining B2B research:Hub – The central cockpit for B2B research. Build self-serve features that compress weeks into days: question → expert insight → follow-up, powered by RAG and adaptive workflows.Prime – Syndicated intelligence at scale. Architect automated systems that continuously capture expert opinions—creating longitudinal datasets and refreshable dashboards that compound in value.The technical challenge: fusing structured survey data with unstructured expert knowledge, building semantic search across proprietary corpora, and creating AI pipelines that maintain research-grade quality at scale. If you love building novel data systems that turn raw signals into defensible, high-margin products, this is where you’ll do the most important work of your career.What We're Looking ForRequiredYou write exceptional code, fast. 3-4 years of experience shipping production code in a fast-paced environmentFull-stack expertise: Moderate proficiency in React, TypeScript, and modern frontend frameworks. Backend experience with Python, Node.js, or similarAI/ML implementation experience: Hands-on experience integrating LLMs, building with OpenAI/Anthropic APIs, or implementing ML models in production. We care more about a demonstrated eagerness to learn and an understanding of complex systems than specific years.Cloud and infrastructure: Experience with AWS, Docker, and modern deployment practicesQuality mindset: Experience with testing, code reviews, and maintaining high code quality standardsCustomer focus: Ability to translate user needs into technical solutions while maintaining engineering best practicesNice To HaveRAG systems, embeddings, semantic searchReal-time data processing or streaming architecturesOpen-source contributions in AI/MLWhat Actually MattersWe care less about credentials and more about demonstrated ability. If you've built something interesting with LLMs- a side project, an open-source contribution, a blog post that shows how you think- put that at the top of your application.Why Join NewtonX?Frontier technology: Work with cutting-edge AI systems, pushing the boundaries of what's possible in enterprise AI applicationsExceptional traction: Strong product-market fit with the world's largest investment banks, hedge funds, and consulting firmsWorld-class team: We take talent density seriously. Work alongside incredibly smart, driven people who are passionate about their craftHigh velocity: Ship features that directly impact how billion-dollar decisions are madeGrowth opportunity: Join during a hypergrowth phase with clear paths for technical and career advancementImpact: Your work will directly shape how the world's leading organizations make critical business decisionsWhat We OfferExcellent medical, dental, and vision insurance.401k match with immediate vesting.Generous Paid time off, holidays, and parental leave.A diverse, collaborative, and positive culture where we invest in and celebrate each other’s success.Flexible work environment where we work hard but have fun (happy hours, team projects, and retreats).NewtonX is proud to be an equal opportunity workplace. We do not discriminate based upon race, religion, color, national origin, sex, sexual orientation, gender identity/expression, age, status as a protected veteran, status as an individual with a disability, or any other applicable legally protected characteristics.