Software Engineer (New York)

InstaLILY is a New York-based AI startup working at the cutting-edge of agentic AI. We build autonomous agents at the frontier of enterprise software, machine intelligence, and human-AI collaboration.  

As a Software Engineer at InstaLILY, you’ll join a team drawn from top-tier university programs. You’ll develop our AI agents platform and drive technical excellence across the org. You’ll work closely with the Lead Software Engineer and cross-functional teams to design and implement new features and capabilities, and help build a culture of continuous learning as we grow.

This role is client-facing. You’ll build and ship AI agents that operate inside our customers’ systems, and you’ll be in regular working sessions with stakeholders at enterprise customers. You need to code at a high bar and communicate decisions clearly.

Responsibilities

• Develop InstaLILY’s AI platform and drive technical excellence throughout the organization
• Work closely with cross-functional teams (product, UI/UX, business development, growth) and key business stakeholders to design and implement new features and capabilities
• Partner with the Growth team during customer deployments: understand workflows, defend architectural decisions, and iterate on feedback
• Raise quality and reliability through comprehensive testing and CI/CD practices
• Build a rapport with the Lead Software Engineer and Head of Product while fostering a culture of continuous learning and improvement
• Collaborate with the product and design teams to deliver high-quality products that meet customer needs
• Stay up-to-date with the latest AI and software engineering trends and technologies

Requirements

• Bachelor’s in CS, engineering, math, physics, or related: demonstrated ability matters more than credential
• 0–2 years as a software engineer (strong candidates have shipped something with real users)
• Strong fluency in at least one backend language (Python, TypeScript, or similar) and a modern web stack
• AI-serious: you’ve built something with LLMs (a RAG system, an agent, a fine-tuned model, a real integration)
• Strong communication: you can explain what you built and why you built it that way to non-technical audiences
• Strong problem-solving and analytical thinking

What You’ll Get

• Proven product: Customers are live; this isn’t a bet on an unproven thesis
• AI-native: In how we build, how we work, and what we sell
• Stage: Early enough to shape how the company scales
• Global: Based in-person in New York with offices in SF and London
• Culture: Sharp, low-ego team that keeps raising the bar
• Growth: The learning curve is steep 

Join InstaLILY and build autonomous agents that matter. If you want a role where your code ships into real enterprise systems and where you’re in the room with customers, we want to hear from you.