Senior AI Agent Systems Engineer

Axion; San Francisco (CA); On-site; USD 180,000 - 280,000; Full time

Benefits offered by this job

Lunch stipend

Equity and benefits

Job summary

Axion is seeking an experienced Software Engineer to architect and scale the agentic systems at the core of our platform. This senior IC role owns design decisions for how agents reason, act, and integrate with enterprise data, collaborating with Engineering and Product leadership.

The ideal candidate thrives in early-stage companies, has deep experience with data-intensive systems, and can make non-deterministic, LLM-driven systems reliable in production.

Qualifications

• Minimum 5+ years of software engineering experience, with recent, hands-on focus on building agentic systems (LLM orchestration, tool/function calling, multi-step and multi-agent reasoning, retrieval and context engineering, and interoperability protocols such as MCP, or comparable work).
• Demonstrated ability to design and own complex distributed systems, ideally in data-intensive B2B SaaS environments.
• Hands-on fluency with the modern agentic stack and a strong intuition for the failure modes of non-deterministic, LLM-driven systems—plus the evaluation and observability practices needed to tame them.
• Experience turning messy, heterogeneous real-world data into something a model can reason over reliably.
• A track record of technical mentorship; you make the engineers around you better without needing formal authority.
• A firm believer in a "Data First" philosophy who can make sound decisions in ambiguous, fast-moving situations.
• A strong executor in fast-paced environments who can balance shipping MVPs with a commitment to production-grade systems.

Responsibilities

• Own technical architecture for our agentic systems—orchestration, tool use, memory, retrieval, evaluation, observability, and the guardrails that keep agents reliable when the input data is noisy and incomplete.
• Build and harden the reasoning layer and infrastructure that take customer data from ingestion through agent-driven reasoning to root-cause insight, at the scale and reliability manufacturers require.
• Establish rigorous evaluation and testing for non-deterministic systems—measuring agent accuracy against expert-validated ground truth and the outcomes customers track: detection rates, investigation speed, and warranty cost.
• Partner across Engineering and Product to shape the technical vision and roadmap for the agent platform.
• Raise engineering standards through code review, design docs, and the technical direction others build on.
• Mentor engineers on agentic patterns and system design, unblocking hard problems and sharing context generously.

Skills

Agentic systems

LLM orchestration

Multi-agent reasoning

Distributed data-intensive systems

Mentorship

Data First philosophy

Production-grade systems

Job description

Axion is seeking an experienced Software Engineer to architect and scale the agentic systems at the core of our platform. This senior IC role owns design decisions for how agents reason, act, and integrate with enterprise data, collaborating with Engineering and Product leadership.

The ideal candidate thrives in early-stage companies, has deep experience with data-intensive systems, and can make non-deterministic, LLM-driven systems reliable in production.