Senior Data Scientist

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Once For All is a high-growth, cloud-based SaaS company. Our platform helps 250k+ customers across the UK & Europe manage supply-chain governance, risk and compliance. We are embarking on a transformation — by placing intelligent, automated decision-making at the heart of our systems & processes.

We’re looking for a Senior Data Scientist with strong Python development background or AI/ Python Engineer who will design and build integrated AI solutions. You will be responsible primarily for delivering AI solutions we are looking to embed across the business, initially building solutions that assist our verification teams in extracting, reasoning over and validating documents.

You’ll additionally help drive initiatives focused on document reasoning for verification over ESG and sustainability documents, helping our customers evidence compliance with ever‑evolving standards.

• Develop, package and maintain shared Python libraries; ensuring robust and clean architecture, testing and CI/CD standards.
• Design and deploy LLM‑based extraction, RAG and agentic workflows over large document collections, and drive value through integration of latest AI tech (agentic workflows etc.)
• Communicate clearly with technical and non‑technical stakeholders.

• Strong general grounding in software‑engineering best practices
  : CI/CD, automated testing, code reviews, observability and performance profiling.
• Experience building quick prototypes (e.g. Streamlit, Dash) to validate ideas rapidly.
• MLOps tooling (e.g. MLflow) and model monitoring experience.
• Strong communication skills and action‑oriented.

• Hands‑on with Azure services (Storage, Container Registry, OpenAI Services).
• Demonstrated experience building extraction/ reasoning systems over documents.
• French or Spanish language skills are a bonus.

• Competitive salary and remote‑first working culture.
• Team & company offsites across Europe.
• Wellness fund / Private Medical Insurance*.
• 25 days annual leave + 8 UK public holidays.
• Holiday purchase scheme (up to 5 additional days).
• 1 paid & 1 unpaid volunteering day per year.
• Continuous professional development budget and access to leading AI tooling.

• Mid-Senior level

• Full-time

• Information Technology

• Software Development