[Hiring] Senior Product Engineer @Plain

Role Description

This role involves building the infrastructure that helps us develop AI features quickly, safely, and with confidence. You will own problems end to end and play a key role in building a category-defining product.

• Own and ship AI features such as our agents, assistants, insights, and more - from concept to production.
• Design and implement backend services for AI integrations and data pipeline.
• Build robust APIs and abstractions for internal AI usage.
• Drive system scalability: caching, optimization, processing patterns, etc.
• Contribute and drive the evolution of the infrastructure for AI including architecture, evaluation, and iteration pipelines.
• Solve complex AI challenges around AI accuracy, reliability, and quality – using rigorous quantitative approaches.
• Advocate for our work externally – writing, speaking, and engaging with the broader AI community.

Qualifications

• Experienced backend engineer who’s shipped AI products in the OpenAI & Anthropic era – especially text and data-heavy AI applications.
• Hands-on experience with LLM orchestration and LLM API optimization (costs, latency, etc).
• Familiar with RAG architectures and technologies.
• AI observability experience.
• Clear perspective on what makes a great AI product.
• Product minded and customer focused in how you build software.
• Measure success by user impact, not just technical elegance.
• Self-driven, impact-focused, and thrive in a fast-moving, high-ownership environment.
• Bonus: experience with agent frameworks and design.

Requirements

• Applied AI experience is required; primarily academic or research ML/AI experience is not suitable.
• Understanding that AI for support is more than just chatbots and deflection.
• Ability to handle ambiguity in an early-stage startup environment.
• Focus on productivity over using the latest tech for its own sake.
• This is a hands-on individual contributor position, not a management role.
• Competitive compensation for a startup environment.