Senior Machine Learning Engineer

Bonfy.AI | Mountain View, CA | Hybrid

Security for the Age of AI

At Bonfy.AI, we’re building the trust layer for generative AI. Our Adaptive Content Security platform detects and mitigates subtle risks baked into large language model (LLM) outputs—before they make it to the user. From hallucinations to hidden data leaks, we help enterprises use GenAI without compromising truth, privacy, or reputation.

We’re model-agnostic, outcome-focused, and unapologetically rigorous. Our customers include Fortune 500 teams deploying LLMs in high-stakes domains—where trust isn't optional.

We’re looking for an engineer who wants to go deeper than metrics—someone who can analyze model behavior, identify subtle failure modes, and build real-time systems that make AI safer to use. You won’t be tuning models for leaderboard glory; you’ll be making them safer, traceable, and accountable. This is a chance to shape the foundation of how the world trusts AI.

• Design and build tools that evaluate and improve LLM behavior across diverse use cases
• Define and evolve trust metrics that go beyond accuracy — including traceability, robustness under edge cases, and interpretability of model decisions.
• Work across teams—infra, product, security—to embed ML insights into a cohesive content safety experience.
• Help us define and refine trust metrics beyond accuracy: traceability, brittleness, interpretability.

• Hands-on experience working with modern NLP systems in real-world contexts (LLMs, embeddings, transformers, etc.).
• Comfort moving from prototype to production in Python—outside the notebook.
• Experience building or working with evaluation frameworks and pipelines.
• Practical thinking, sharp debugging skills, and an appetite for ambiguity.

• Experience using or building tools that evaluate the behavior of language models (LLMs).
• Background in environments where trust, safety, or compliance is critical—even if outside traditional “regulated” industries.
• Hands-on experience testing AI systems for edge cases, failure modes, or unexpected behavior.

• You’ll have technical autonomy and direct exposure to customer use cases.
• We’re early-stage, well-funded, and mission-driven—your code will shape our trajectory.
• We believe in clarity, urgency, and respect. We value what you ship, not how loud you are.
• You’ll work with a sharp, kind, high-trust team that knows what’s at stake.

Competitive salary. Generous equity. Flexible hybrid schedule. Health, vision, and dental coverage. And most importantly: a chance to build something meaningful during the most critical phase of AI’s evolution.

• You believe safety isn’t just an add-on—it’s essential to how AI is built.
• You understand that trust in AI must be demonstrated through evidence, not assumed by design.
• You’re willing to question conventional approaches when they fall short.
• You want to contribute meaningfully to the evolution of responsible AI, not just follow established paths.

Bonfy.AI — Truth. Security. Intelligence.