Software Engineer, Full Stack
Full-stack engineer building InstaLILY's AI agent platform — backend services, agent infrastructure, APIs, and customer-facing web UIs for LLM-powered autonomous agents. Deeply client-facing: runs technical discovery and embeds with enterprise customers. Stack: TypeScript/React/Next.js, Python/FastAPI, PostgreSQL, GCP.
- Compensation
- $150K–$190K / yr
- Location
- New York, New York, United States, San Francisco, California, United States
- Work setup
- Not specified
- Seniority
- Not specified
- Employment
- Not specified
- Experience
- 3+ years
- Category
- Fullstack
- Posted
Skills
Must have
- Bachelor's or Master's in CS, engineering, math, physics, or related (demonstrated ability matters more than credential)
- 3–5 years of experience as a software engineer, with a track record of shipping production systems across the full stack
- Strong 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
- Production experience with cloud infrastructure (AWS, GCP, or Azure) and CI/CD pipelines
- Built and shipped something real with LLMs (production RAG system, agent in customer hands, or non-trivial integration)
- Comfortable in front of customers: run technical discovery sessions and defend architectural decisions to non-technical executives
- Strong written and verbal communication (design docs, customer-facing updates, presentations)
- Required stack: TypeScript, React/Next.js, Python, FastAPI, SQLAlchemy, PostgreSQL
Nice to have
- Experience mentoring junior engineers, leading technical reviews, or owning a meaningful surface of a codebase
- Prior experience in a forward-deployed, solutions engineering, or client-embedded role at a B2B software company
- Nice to have: GCP, Vercel, Temporal, Alembic, Docker
- Nice to have: prior experience with third-party / enterprise system integrations
Full description
About InstaLILY
InstaLILY 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. Learn more at .
The Traction
Revenue grew 5x over the past year, and Lily has driven over $200M in new annual sales for a single customer. We serve some of the largest operators in our industries, including SRS Distribution (part of The Home Depot family), United Rentals, and Henry Schein, and we work closely with the Google DeepMind and NVIDIA ecosystems.
How We Work
We work in small teams with real ownership: clear problems, direct access to the customers whose work you're changing, and room to ship. Your code runs in live production systems inside billion-dollar operations, so you see your impact directly. People who do well here want that proximity to the work. We're growing fast, and the people who join now shape what this company becomes. Everything runs on three principles: Customers, Culture, and Code.
About the Role
As 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.