Software Engineer - Agent Harness

Instabase; San Francisco (CA); On-site; USD 210,000 - 290,000; Full time

Job summary

Instabase is seeking a Staff AI Engineer to design the foundation of the Agent Harness runtime, enabling SuperApp to operate as a scalable, secure enterprise-grade agentic OS.

You will bridge cutting-edge LLMs with production execution, leading architecture and implementation across teams, and shaping how customers turn unstructured data into actionable insights.

The role emphasizes systems thinking, security, and performance in a fast-growing, people-first environment.

Responsibilities

• Design the Agent Harness runtime and ensure security and scalability.
• Bridge cutting-edge LLM foundations with production-grade execution.
• Collaborate with cross-functional teams to deliver SuperApp capabilities.

Job description

At Instabase, we're passionate about democratizing access to cutting-edge AI innovation to enable any organization to solve previously unsolvable unstructured data problems in their industry. With customers representing some of the largest and most complex organizations in the world, and investors like Greylock, Andreessen Horowitz, and Index Ventures, our market opportunity is near infinite.

Instabase offers a consumption-based pricing model where customers can pay only for what they use, aligning directly with the value our products deliver. It empowers our clients to explore our AI Hub platform features extensively, enabling them to uncover crucial business insights. This customer-centric model allows Instabase to glean insights from diverse use cases and behaviors, ensuring we deliver top-tier solutions that provide unmatched advantages for everyday business operations.

With offices in San Francisco and Bengaluru, Instabase is a truly global company. We arepeople-first, and we've built a fearlessly experimental, endlessly curious, customer obsessed team who work together and help organizations around the world turn their unstructured data into insightsinstantly.

About Instabase & SuperApp

Instabase is on a mission to democratize access to cutting-edge AI innovation, enabling organizations to solve previously unsolvable unstructured data problems.

SuperAppis our flagship AI agent workspace. It unifies communication, collaboration, file sharing, and multimodal reasoning into a single, seamless platform. Powering SuperApp is ourAgent Harness—the underlying execution engine that manages agent states, orchestrates multi-turn planning and tool execution, enforces strict security guardrails, and runs untrusted, dynamic code in secure, sandboxed environments.

As a Staff AI Engineer on the Agent Harness team, you will design the foundation of this runtime execution environment, enabling SuperApp to act as a resilient, highly scalable, and ultra-secure agentic operating system for the enterprise.

Role Overview

We are seeking a visionary systems-minded AI engineer to lead the design, architecture, and development of theAgent Harness. In this role, you will bridge the gap between advanced foundation models (LLMs) and reliable, production-grade execution.

You will not just be