Backend Engineer, Marketplace

About Mercor

Mercor is defining the future of work. We partner with leading AI labs and enterprises to provide the human intelligence essential to AI development. Our vast talent network trains frontier AI models in the same way teachers teach students: by sharing knowledge experience and context that cant be captured in code alone. Today more than 30000 experts in our network collectively earn over $2 million a day.

Mercor is creating a new category of work where expertise powers AI advancement. Achieving this requires an ambitious fast-paced and deeply committed team. Youll 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.

About Mercor

Mercor is defining the future of work. We partner with leading AI labs and enterprises to provide the human intelligence essential to AI development.

Our vast talent network trains frontier AI models in the same way teachers teach students: by sharing knowledge experience and context that cant be captured in code alone. Today more than 30000 experts in our network collectively earn over $2 million a day.

Mercor is creating a new category of work where expertise powers AI advancement. Achieving this requires an ambitious fast-paced and deeply committed team. Youll 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 new San Francisco headquarters.

About the Role

As a Backend Engineer on the Marketplace team you will build the core systems that govern how talent and opportunities meet on Mercor. Youll work on search matching allocation and workflow infrastructure at the heart of the marketplace where system quality directly affects fill rate hiring speed and revenue.

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

What Youll Build

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

Example Problems

Build the systems that determine which candidates are eligible for which opportunities
Design matching and allocation infrastructure that balances 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

What Were Looking For

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

Nice to Have

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

Why This Role

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.

Tech Stack

Python Go Kafka Postgres Redis Elasticsearch Kubernetes Terraform

Benefits

• Generous equity grant vested over 4 years

• A $10K housing bonus (if you live within 0.5 miles of our office)

• A $1.5K monthly stipend for meals

• Free Equinox membership

• Health insurance

Required Experience:

IC