Software Engineer, Full Stack

Software Engineer, Full StackNew York, New York, United States, San Francisco, California, United StatesAbout InstaLILYInstaLILY is an AI products and infrastructure company that puts execution at the frontier of enterprise AI. That work begins with Lily™, the world's first AI Forward Deployed Engineer, which learns how a business works, builds the software it needs, and goes live in days. It does not leave when the work ships; it stays and keeps the software working as the business changes. Lily runs wherever the work happens, in the cloud, on-premise, or at the edge, through InstaLILY's Small Data Center, built with NVIDIA technology. Founded in 2023 by Amit Shah and Sumantro Das, InstaLILY has raised nearly $100 million from Energize Capital, Insight Partners, and Home Depot Ventures. Headquartered in New York, with offices in San Francisco, London, and Toronto, InstaLILY serves leading companies across construction, industrial distribution, logistics, healthcare, and other operationally intensive industries.About the RoleAs a Full Stack Software Engineer at InstaLILY, you'll own meaningful pieces of our AI agent platform: the core systems that let autonomous agents reason, act, and integrate into our enterprise customers' workflows. You'll work alongside the Lead Software Engineer and a team drawn from top-tier programs to design, build, and ship the platform features that show up in production at our customers. You'll work across the stack, from backend services and agent infrastructure to APIs and the web interfaces our customers actually touch.This role is deeply client-facing. You won't be coding in a vacuum and handing off to a customer success team. You'll be in the room with our customers from the start. You'll sit in working sessions with enterprise stakeholders, run technical discovery, translate messy real-world workflows into shipped features, and embed with customer teams during rollouts. The best engineers here are the ones who can switch between writing production code in the morning and walking a Fortune 500 VP through a system architecture in the afternoon. You need to code at a high bar, make architectural decisions you can defend, and explain them clearly to people who don't speak engineer.ResponsibilitiesOwn end-to-end design and delivery of features across the full stack: backend services, agent infrastructure, APIs, and customer-facing web UIsBuild, ship, and operate LLM-powered systems: agents, RAG pipelines, tool-use frameworks, evaluation harnesses, and the supporting infrastructure that makes them reliable in productionLead technical discovery with new enterprise customers; sit with their teams, map their workflows, and translate what you hear into shipped productEmbed with customer teams during deployments and rollouts; be the engineering presence in the room, not the one waiting for a Jira ticketPresent architecture and technical tradeoffs to non-technical executives at our customers, and defend them under pressurePartner with the Growth team to turn customer feedback into roadmap; iterate on what's actually being used vs. what we thought would be usefulRaise quality and reliability across the codebase through comprehensive testing, code review, and CI/CD practicesMentor junior engineers: pair on hard problems, review their code thoughtfully, and help them level upContribute to architectural discussions and technical reviews; help shape how we build as we scaleStay current on AI/ML and software engineering trends, and bring back what's worth adoptingMinimum QualificationsBachelor's or Master's in CS, engineering, math, physics, or related: demonstrated ability matters more than credential3–5 years of experience as a software engineer, with a track record of shipping production systems across the full stackStrong fluency on the backend (Python, TypeScript, or similar) and the frontend (React, Next.js, modern TypeScript)Solid grasp of system design fundamentals (API design, data modeling, async patterns, caching, queues) and frontend architecture (component design, state management, performance)Production experience with cloud infrastructure (AWS, GCP, or Azure) and CI/CD pipelinesAI-serious: you've built and shipped something real with LLMs (a production RAG system, an agent in customer hands, a non-trivial integration), and you have opinions on what works and what doesn'tComfortable in front of customers: you can run a technical discovery session, defend an architectural decision to a non-technical exec, and translate vague enterprise requirements into something concreteStrong written and verbal communication: you can write a clear design doc, send a clean customer-facing update, and present to a room without disappearing into jargonPreferred QualificationsExperience mentoring junior engineers, leading technical reviews, or owning a meaningful surface of a codebasePrior experience in a forward-deployed, solutions engineering, or client-embedded role at a B2B software companyOur StackWe're a TypeScript + Python shop. You'll work with these every day:Frontend: TypeScript, React, Next.js (deployed on Vercel)Backend: Python, FastAPI, SQLAlchemyDatabase: PostgreSQL with Alembic for migrationsInfrastructure: GCP, DockerWorkflow orchestration: TemporalLots of third-party integrations into our enterprise customers' systemsRequired: TypeScript, React/Next.js, Python, FastAPI, SQLAlchemy, PostgreSQLNice to have: GCP, Vercel, Temporal, Alembic, Docker, prior experience with third-party / enterprise system integrationsYou don't need to have used every tool on our stack; strong engineers ramp quickly. But you should be genuinely fluent in the required core: TypeScript on the frontend and Python on the backend, with real production experience shipping features end-to-end.What You'll GetProven product: Customers are live; this isn't a bet on an unproven thesisAI-native: In how we build, how we work, and what we sellStage: Early enough to shape how the company builds and scalesCustomer access: Real seats at the table with enterprise customers; you'll learn how the largest companies in the world actually buy, deploy, and use softwareGlobal: Based in New York with offices in SF and LondonCulture: Sharp, low-ego team that keeps raising the barGrowth: The learning curve is steepCompensation and BenefitsSalary Range: $150,000–$190,000 per year, commensurate with experienceEquity: Stock options awards, and refreshers for top performersBenefits: Medical, Dental, Vision, 401K, in-office Lunch reimbursement, Wellbeing Stipend, Generous Parental leave, PTO and 10 US Federal Holidays, and more!Join InstaLILY and build autonomous agents that matter. If you want a role where you own real surfaces of an AI platform, where your code ships into real enterprise systems, and where you're in the room with the customers using them, we want to hear from you.Quality Over QuantityTo ensure a focused, high-quality hiring experience, we kindly ask candidates to limit their applications to 3 open requisitions at any given time. Applying strategically to roles that best align with your skills and career goals gives you the highest chance of standing out. Have you interviewed with us in the past 12 months? We encourage you to reach out directly to your previous interviewer rather than submitting a