AI Engineer - London

Applied AI Engineer

We’re a high-growth B2B fintech startup revolutionising financial services with AI. Imagine Harvey AI for Financial Services – our mission is to democratise financial access for 1 billion people.

About the Role

We’re looking for a hands-on AI Engineer, super passionate about AI engineering, to design and scale AI agents. Join our dynamic, friendly, close-knit team to build impactful LLM-powered solutions at speed.

Responsibilities

• Build and refine LLM-based agents, focusing on retrieval-augmented generation and data retrieval systems
• Develop robust AI evaluation frameworks, metrics, and methodologies
• Demonstrate NLP fundamentals (tokenisation, embeddings, LLM understanding)
• Practise prompt engineering (few-shot, role-based, …), continuously testing and optimising prompts with tools like Weave or Laminar
• Balance constraints (token limits, cost, speed) while maintaining clear, structured outputs
• Apply back-end expertise for data-intensive applications, writing clean, modular Python code and performing quick data processing

What Values We’re Looking For and what you can expect the Saturn team to be:

• Pursue Greatness: Strive for excellence in everything you do, iterating, learning, growing, and embracing discipline to drive progress.
• Earn Trust: Build strong relationships through integrity, transparency, and delivering on your promises.
• Seek Truth: Be data-driven, curious, and unafraid to challenge assumptions in pursuit of the best solutions.
• Be Audacious: Dream big, take ownership, take calculated risks, and push boundaries to create meaningful progress.
• Orbit Together: Collaborate with a shared mission, knowing collective success drives greater outcomes.

Technical Must-Haves

• LLM-based agent design with retrieval-augmented generation
• Proficiency in AI evaluation frameworks, NLP fundamentals (tokenisation, embeddings, LLM architecture), and bias handling
• Prompt engineering with systematic experimentation (tools like Weave or Langsmith)
• Strong Python back-end skills for data-intensive systems and data processing
• Ability to balance token limits, cost, and speed while producing structured outputs

What We Offer

• Competitive salary and meaningful early-stage equity
• Autonomy and ownership in your work
• Budget for learning and professional growth
• Access to world-class gym and wellness
• Bi-annual team retreats
  
  We can also sponsor a visa if you are from India or US.

About Us

We’re Saturn, the fast-growing B2B startup (top in S24 batch) and are backed by top-tier investors. We’re building a game-changing platform to bring financial peace of mind to billions worldwide.