Job Specifications
Founding Backend AI Engineer | Python, TypeScript, LLMs, RAG | Seed-Funded B2B SaaS | £100,000 - £140,000 + Early Stage Equity | London, Hybrid (3-4 days PW) | Can Sponsor + Relocate
The Company
We’re supporting a well-funded Seed-stage B2B SaaS startup backed by top-tier European investors.
They are automating a traditionally manual, data-heavy operational process that sits at the heart of large online businesses. The platform is already in use with several enterprise customers, and funding has been secured to scale engineering and deliver an AI-driven product roadmap.
You’ll be joining very early, working with an experienced founding team who have previously built and scaled well-known tech companies.
The next phase is product expansion, deeper automation, and building intelligent systems that turn unstructured data into actionable insights at scale.
About the Founding Backend AI Engineer | Python, TypeScript, LLMs, RAG | Seed-Funded B2B SaaS | £100,000 - £140,000 + Early Stage Equity | London, Hybrid (3-4 days PW) | Can Sponsor + Relocate
As the Founding AI Engineer, you will architect and build production-grade AI features into the core platform. The role blends backend engineering, data processing, and practical AI/LLM deployment.
Your work may include:
Designing AI-powered workflows for unstructured and semi-structured data
Building intelligent document processing, matching and extraction
Developing scalable pipelines and APIs in Python
Working on retrieval, embeddings, and search
Productionising LLM-driven features for real customers
This is a hands-on engineering role with high ownership. You will collaborate directly with the CTO and founding engineers, and have real influence over architecture, model choice, tooling and product direction.
Requirements for Founding Backend AI Engineer | Python, TypeScript, LLMs, RAG | Seed-Funded B2B SaaS | £100,000 - £140,000 + Early Stage Equity | London, Hybrid (3-4 days PW) | Can Sponsor + Relocate
Strong backend engineering experience (Python preferred)
Experience working with LLMs, NLP or applied machine learning in production
Understanding of data pipelines, distributed systems or large-scale processing
Cloud experience (AWS, GCP or Azure)
Comfortable in fast-paced, high-ownership environments
Excellent communication and product mindset
Experience in a startup or scale-up is a strong advantage, but not required if you can demonstrate ownership of end-to-end systems.
What’s on Offer for Founding Backend AI Engineer | Python, TypeScript, LLMs, RAG | Seed-Funded B2B SaaS | £100,000 - £140,000 + Early Stage Equity | London, Hybrid (3-4 days PW) | Can Sponsor + Relocate
Up to £140,000+ salary + meaningful early-stage equity
Hybrid working, East London office (3-4 days per week)
Chance to shape technical strategy and culture from day one
Real-world AI problems with paying customers and immediate impact
Long-term progression into Principal or Head of AI
If you’re interested in the Founding AI Engineer | Python, LLMs, Data Pipelines | Seed-Funded B2B SaaS | £140,000 + Equity | London, Hybrid, apply today. If your background fits, we’ll reach out to discuss next steps.
About the Company
Hey, we are Owen Thomas. We are a relationship first recruitment partner for Data, Product & Engineering, across Contract and Permanent roles in the UK & Europe.
Humanness matters. We believe that empathy is the core of great recruitment; bringing opportunity and businesses to life, beyond what a person can see on a website.
All done with our OT personal touch.
Our mission: To be leaders within our specialisms and create unrivalled opportunities both internally and externally.
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