Bluebird
Principal AI Engineer
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Principal AI Engineer (Agentic AI)
Location: London preferred, UK-remote considered
Salary: up to 200,000 GBP base, plus equity and bonus
About the role
We are partnering with a category-leading online learning company that is rebuilding its product around AI-native, personalized tutoring. Following the acquisition of an AI-native learning startup, they are assembling a small, high-calibre AI engineering team to build two core systems from the ground up: an AI Tutor that delivers real-time, adaptive teaching (finally cracking one-to-one tutoring at scale), and an AI Creator that turns expert knowledge into high-quality, interactive learning content. The early AI product is already outperforming their legacy platform on learner satisfaction and conversion, and you would have real ownership as the team scales.
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What you will build
- The core agentic systems behind a real-time AI tutor and an AI content generator.
- Production LLM systems that are fast, reliable and cost-efficient, including the move from frontier models toward open-weight models without losing quality.
- The evaluation frameworks and human-in-the-loop quality controls that prove the product actually teaches.
What you will do
- Design and ship agentic workflows in Python with LangGraph or LangChain, prompts and vector databases.
- Own systems end to end, from architecture through production, monitoring and iteration.
- Optimize for cost, latency and reliability at scale.
- Mentor a small team and shape zero-to-one product direction.
What we are looking for
- A builder first: strong software-engineering foundations and a track record of shipping agentic AI systems to real users in production.
- Proven ability to operate at principal or staff level on complex production AI systems.
- Hands-on experience with model and cost optimization, and with evaluating output quality (golden sets, LLM-as-judge, user feedback).
- Genuine interest in education, or prior EdTech or AI-education product experience (especially for the Creator work).
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Bonus points
- Background at a fast-moving startup (YC or similar) or as a founder.
- Experience fine-tuning or adapting open-weight models.
- Work on educational content quality or data-labeling pipelines.
Logistics
- Remote-friendly with occasional travel for collaboration.
- Permanent role, with visa sponsorship and relocation available for the right person.
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