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Software Engineer, Agents

Mercor· Engineering
Apply on company site
San Francisco$130k - $500kFull-timePosted 11mo ago

About the role

Mercor seeks a Software Engineer to build agentic products at scale, specializing in backend/frontend/data/infra for agent systems and RL environments. Role is team-matched to Automation or Studio, with a focus on end-to-end ownership of agentic features and cross-functional collaboration.

Responsibilities

  • Own agentic features end-to-end — from scoping with researchers/ops partners through implementation, launch, and iteration on real customer feedback.
  • Design and ship LLM agents, harnesses, and verifiers — including the tools, prompts, and policies that make them reliable.
  • Build the Python/FastAPI services and Temporal/Modal pipelines that orchestrate agent runs, human-in-the-loop review and iterations.
  • Build state of the art RL environments that expand the capabilities of frontier agents, with realistic enterprise apps, simulated coworkers, and rich company data rooms that support tasks spanning hours to days.
  • Build tooling that turns agent trajectories into insight, from statistical analysis to automated failure mode detection.
  • Build and refine the full-stack surfaces and data infrastructure — craft Next.js/React interfaces where operators and experts work with agents, evolve data models to give agents the structured context and audit trails they need.
  • Define agent quality and drive continuous improvement — build evals, instrument traces, analyze failure modes, and iterate on prompts, tools, and guardrails while raising the bar for reliability, cost, latency, and UX.
  • Partner cross-functionally to shape agent autonomy — work with Product, Design, Research and Ops to draw the lines between autonomous action, propose-and-approve flows, and human-in-the-loop decisions.

Qualifications

  • Experience building scalable software systems
  • Proficiency in Python and FastAPI (backend)
  • Experience with frontend tech: Next.js, React, TypeScript, Tailwind
  • Familiarity with databases (PostgreSQL, MySQL, Snowflake, DuckDB, Redis)
  • Knowledge of orchestration/infra (Kubernetes, Temporal, Modal)
  • Exposure to agents/LLM tooling (LangGraph, LangChain, FastMCP, Harbor, NemoGym)
  • Observability tooling (Datadog, PostHog, LangSmith)
  • Ability to work cross-functionally in a fast-paced environment

Skills

Required:PythonFastAPINext.jsReactTypeScriptPostgreSQL
Nice to have:TailwindMySQLSnowflakeDuckDBRedisKubernetesTemporalModalLangGraphLangChain

Benefits

  • Bi-annual performance bonus structure
  • Generous equity grant vested over 4 years
  • Up to $15k Relocation bonus
  • $10K housing bonus (within 0.5 miles of office)
  • $1.5K monthly meals stipend
  • Free Equinox membership
  • $200 monthly laundry reimbursement
  • $200 monthly personal wellness reimbursement
  • Health, Dental, Vision insurance
Last updated Sep 16, 2026. Interested? Apply on the company site.

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