Software Engineer, Marketplace

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. Millions of domain experts on the platform are paid over $4 million per day to train frontier AI models. Mercor's APEX benchmark family measures AI's real-world impact on professional work. Mercor Enterprise brings this same infrastructure to Fortune 500 companies: helping companies capture how their best people actually work, translating that expertise directly back into agents.

Mercor is creating a new category of work where expertise powers AI advancement. Achieving this requires an ambitious, fast-paced and deeply committed team. You’ll work alongside researchers, operators, and AI companies at the forefront of shaping the systems that are redefining society. Mercor is a profitable Series C company valued at $10 billion. We work in-person five days a week in our San Francisco, NYC, or London offices.

As a Software Engineer on the Marketplace team, you will own the core systems that bring human intelligence to AI opportunities You'll work on search, matching, allocation, and workflow infrastructure at the heart of the marketplace, where systems deliver the world’s top experts to staff our cutting edge projects.

The problems are technically demanding and tightly coupled to business outcomes: latency, reliability, throughput, and system quality all directly affect marketplace performance.

• Backend services that power candidate-job matching, routing, and marketplace workflows

• APIs and internal systems for search, eligibility, scoring, allocation, and fulfillment

• Data models and system abstractions for a rapidly evolving labor marketplace

• Infrastructure for real-time and asynchronous decisioning at high volume

• Operational systems and tooling that keep product-critical workflows reliable, observable, and easy to evolve

• • Build the systems that determine which candidates are eligible for which opportunities

• • Design matching and allocation infrastructure that balance speed, quality, and fill rate

• • Improve the performance and reliability of APIs serving marketplace decisions in real time

• • Develop workflow engines for onboarding, vetting, routing, and placement

• Design backend abstractions that let product and ML teams iterate quickly without degrading system quality

• • Track record of building and operating reliable backend systems in production

• • Strong judgment in system design, performance, reliability, and data modeling

• • Comfort working on high-throughput APIs, distributed systems, and asynchronous workflows

• • Ability to translate product and marketplace requirements into clean technical systems

• • High engineering standards and a bias toward simple, durable abstractions

• • Experience with search, recommendation, matching, scheduling, or marketplace systems

• • Experience supporting ML-powered products or integrating model inference into production systems

• • Familiarity with event-driven architecture, queues, caching, and observability tooling

This role sits on a core decision layer of the product. Your work will directly shape how the marketplace operates: which opportunities get filled, how quickly hiring happens, and how reliably the system scales as volume and complexity increase.

Python, Go, Kafka, Postgres, Redis, Elasticsearch, Kubernetes, Terraform