Fullstack Software Engineer, Agent Platform

Job summary

Responsibilities

Our agent platform is the core system Mercor uses to build, run, and showcase AI agents — the same platform our teams rely on internally every day and the one we demo live on customer calls. It is simultaneously our internal workbench and our external storefront.

• Own the agent platform across the full stack — from the internal- and client-facing React interfaces to the backend APIs and services orchestrating agents, workflows, and…
• Enable hundreds of internal users and dozens of enterprise clients — ship the features, reliability, and polish that make the platform their daily driver and a confident live demo.
• Build the foundational layer other teams depend on to stand up new agent use cases, task formats, and client configurations quickly and without rework.
• Ship high-leverage product features that raise both internal productivity and the customer-facing quality of the platform.
• Translate ambiguous requirements into well-scoped technical solutions through close collaboration with Applied AI researchers, product, design, and operations.

What they're looking for

• 2+ years of fullstack engineering experience building and shipping production software.
• Deep proficiency in JavaScript/TypeScript (React + Next.js) and a strong grasp of frontend architecture, state management, and design patterns.
• Solid backend experience in Python and/or Node.js — designing and building relational databases, REST APIs, and async task infrastructure.
• Strong design sense and empathy for end-users; you hold a high bar for usability.
• Experience with complex, high-throughput systems — pipelines, large data volumes, or multi-tenant architectures.

Tech stack

• React
• TypeScript
• Python
• Node.js