Experience

Data Integration & Transformation
Data Warehousing & Cloud Migration
Data Security Management
Project Transition & Continuity
Data Strategy & Advisory Recommendations

I started in data over 12 years ago — no formal training, just curiosity, good people, and the drive to make things work. Since then, I've worked with organisations across industries to build data platforms that are fast, reliable, and business-focused.

In recent years, I’ve focused on:

- Designing end-to-end platforms using Snowflake, Matillion, and Power BI

- Leading teams and mentoring developers through delivery and handover

- Helping clients navigate the messy middle of projects: transition, continuity, and clarity

I’m currently a Principal Consultant at Snap Analytics, where I focus on enterprise data platform builds and delivery strategy.

This site exists as a space to share things I've learned — patterns, approaches, and opinions that might help someone else along the way.

Testimonials

One of the most talented and genuine people I’ve worked with. Takes a very measured and pragmatic approach to Projects or resolving problems. Always identifies the positives that can be taken from difficult situations or relationships. An asset to any organisation both technically and personally.

Richard Miller (Senior Analytics Analyst) - Adaptavist
I worked with James for many years in a variety of capacities. James effectively and efficiently managed a student assessment operation (~18k students) whilst I was seconded to a project. I have done a lot of work on MIS/warehouse development with James and he has produced excellent results in this. But perhaps most important of all James is a kind and compassionate person so is always a pleasure to work with.

Colin Clark (Assistant Registrar) - University of Sussex
James Mullan was one of the best data engineers on the project with his experience with Matillion and Snowflake was critical to the project's success. Even though he had not worked in the financial or stock market section he picked up data understanding very fast. I hope to have a chance to work with him again in future.

James Rawlinson, Cloud Architect - London Stock Exchange Group (LSEG)