Founding AI Engineer

Position Overview

• Location Type: Remote
• Job Type: Full-Time
• Salary: £75K - £130K

Plain is redefining customer support for the next generation of B2B companies. We’re building the fastest, most powerful platform to help companies move beyond reactive support and build true customer relationships. B2B customer support is undergoing a seismic shift. AI is transforming the way companies engage with customers, shifting support from a siloed function to a company-wide effort across Slack, Discord, and in-product experiences. The old way – slow, manual, and disconnected – no longer works. Some of the world’s most forward-thinking companies – like Stytch, Sanity, and Fly.io – trust Plain to unify all customer interactions, enable faster team collaboration, and supercharge their workflows with AI.

Requirements

• Experienced backend engineer who’s built AI products in the OpenAI & Anthropic era – especially text- and data-heavy AI applications.
• AI observability experience.
• Clear perspective on what makes a great AI-powered product.
• Self-driven, impact-focused, and thrive in a fast-moving, high-ownership environment.
• Measure your success by user impact, not just technical elegance.
• Bonus: Data science background that helps you fine-tune AI accuracy and quality.

Responsibilities

• Define our AI infrastructure and play a key role in shaping our AI strategy.
• Own and ship AI-powered features from concept to production.
• Solve complex machine learning challenges – especially around AI accuracy, reliability, and quality – using a rigorous, truth-seeking approach.
• Serve as the team’s AI expert, helping to build a world-class AI practice.
• Advocate for our work externally – writing, speaking, and engaging with the broader AI community.

Company Information

• Plain is building a platform to unify all customer interactions, enable faster team collaboration, and supercharge workflows with AI.
• The company works with companies like Stytch, Sanity, and Fly.io.
• This is a rare chance to shape the AI strategy of an early-stage, high-impact product and help build a category-defining company.
• Engineering at Plain isn’t about just moving tickets. It’s about solving complex, high-impact problems – owning them end-to-end, from prototype to production.