3) Frontend Software Engineer

Mercor • San Francisco, CA

84d

About The Position

As a Senior Software Engineer at Mercor, you’ll take end-to-end ownership of complex projects that power the workflows of the world’s leading AI companies. You’ll architect and scale distributed systems, mentor other engineers, and set technical direction for high-impact initiatives. This role goes beyond coding: you’ll help shape engineering culture, influence product decisions, and ensure our systems scale in lockstep with our hyper-growth. At the end of the process, you’ll be team-matched to where you can have the most impact, on one of the following: Talent platform side – building next-generation tools that automate recruiting end-to-end, intelligently match candidates to roles, and power global hiring with seamless contracts and payments. Applied AI/human data side – partnering with top AI researchers from the AI labs like OpenAI, Anthropic, and Google to create post training datasets to improve foundational model capabilities.

Requirements

• Strong coding fundamentals in Python (our primary backend), though interviews are language-agnostic.
• Deep understanding of distributed systems, scalability challenges, and system design.
• Experience shipping production systems at scale in high-growth or high-stakes environments.
• Ability to reason about trade-offs and make decisions balancing speed and reliability.
• Strong communication skills with an ability to align technical and business goals.
• Bias toward ownership, curiosity, and delivering simple solutions to complex problems.

Responsibilities

• Design, build, and scale production-grade backend APIs, services, and infrastructure.
• Take ownership of system design and architecture decisions that impact core workflows.
• Mentor and support junior engineers through code reviews, pair programming, and design discussions.
• Partner with Product and Design to deliver features quickly without sacrificing quality or scalability.
• Anticipate technical bottlenecks, propose solutions, and drive initiatives that increase reliability.
• Contribute to the systems that enable OpenAI, Anthropic, Google, and others to train and evaluate their models.

Benefits

• Generous equity grant vested over 4 years
• A $20K relocation bonus (if moving to the Bay Area)
• A $10K housing bonus (if you live within 0.5 miles of our office)
• A $1K monthly stipend for meals
• Free Equinox membership
• Health insurance

What This Job Offers

• Job Type: Full-time
• Career Level: Senior