Senior Agent Harness Engineer

Nickel; San Francisco (CA); On-site; USD 180,000 - 260,000; Full time

Job summary

Nickel is hiring for a role at the forefront of AI infrastructure, building a proprietary Agent Harness stack that blends algorithms, engineering, and modeling. The team designs runtimes, memory, tools, and scheduling for ultra-long-horizon multi-agent tasks and ensures ongoing co-evolution with model training.

Ideal candidates combine deep expertise in LLMs, agent systems, and prompt/context engineering, with strong communication in English.

Qualifications

• Advanced knowledge of large language models and agent-based systems.

Responsibilities

• Research and implement cutting-edge Harness mechanisms.
• Manage context, memory, and tool orchestration for multi-agent tasks.
• Coordinate with model training to evolve Harness algorithms.
• Design system architecture for Agent runtime, scheduling, and sandboxing.

Skills

Deep learning

LLM tooling

Agent systems

Programming

Education

Master’s degree in CS or related field

Tools

Claude Code

Cursor

Codex

Copilot

Manus

OpenClaw

Job description

Nickel is hiring for a role at the forefront of AI infrastructure, building a proprietary Agent Harness stack that blends algorithms, engineering, and modeling. The team designs runtimes, memory, tools, and scheduling for ultra-long-horizon multi-agent tasks and ensures ongoing co-evolution with model training.

Ideal candidates combine deep expertise in LLMs, agent systems, and prompt/context engineering, with strong communication in English.