Software Engineer, Frontier Data Products
Mercor · New York City
About this role
## Software Engineer — Frontier Data Products ### About Mercor Mercor’s mission is to organize human intelligence to power the AI economy. We’re a leading AI data company building the layer between human expertise and frontier models—where domain experts are paid to train models, and our APEX benchmark family measures real-world impact on professional work. Mercor is a profitable Series C company valued at $10B, and we work **in-person five days a week** in **San Francisco, NYC, or London**. ### About the Role Frontier AI companies are increasingly bottlenecked on expert judgment and high-quality data workflows. This team builds the **production systems** that **capture, coordinate, and validate** expert work at scale—directly between a customer request and the output that ships. These are **long-running, stateful systems**: jobs can stay live for days, interleaving automated steps, model inference, and expert review. Steps marked “done” can be reopened and redone, so “completed” isn’t always final—state must tolerate late mutation and remain correct even when humans and models disagree. This is a **backend systems and orchestration** challenge: **distributed state machines**, not pipelines. The architecture isn’t fully set yet—early engineers will help shape what it becomes, with a short loop between shipping and impact. ### What You’ll Do - Design **services and state models** for multi-stage workflows that fan out across automated processing and expert reviewers, then reconcile results into a coherent whole - Build **orchestration primitives**: retries, failure recovery, idempotency, and auditable state transitions - Integrate **model inference** into production workflows without sacrificing debuggability or human oversight - Build **APIs and tooling** so product, operations, and ML teams can operate, debug, and trust these systems at scale - Own **reliability and observability** for workflows where silent failure can corrupt results—not just cause a 500 ### What Makes This Role Different - You are...
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