Lewin Appleton-Fox
Verified Expert in Engineering
Data Engineer and AWS Developer
Wellington, New Zealand
Toptal member since June 8, 2022
Lewin is a senior data engineer with management experience specializing in AWS, Python, and R and a good mix of technical and soft skills. He has built, trained, and managed teams from the ground up, reconfigured an RStudio Server installation, and developed a model for agricultural greenhouse gas emissions for use by the New Zealand government for IPCCC disclosures. Lewin is competent in writing documentation to ensure project viability and maintains open source software projects.
Portfolio
Experience
Availability
Preferred Environment
Visual Studio Code (VS Code), Python, R, Data Build Tool (dbt), Snowflake, Amazon Web Services (AWS), Linux, Hadoop
The most amazing...
...machine learning project I've built was a lead targeting model that improved conversion by 25% over manual targeting.
Work Experience
Data Tech Specialist
ACC
- Created ETL pipelines for ingesting Parquet and JSON data from Azure Blob Storage into Snowflake.
- Built internal GUI and CLI tools to streamline a data engineering workflow.
- Documented and provided training on internal tools.
Senior Data Engineer
New Zealand Post
- Acted as a tech lead for Python and AWS Lambda development.
- Built CI/CD pipelines using Terraform and GitHub Actions.
- Trained and mentored junior team members, reviewing code and advising on approach.
Senior Analyst
Ministry of Justice
- Reconfigured and administered an RStudio Server installation for the ministry.
- Provided training and mentoring to junior analysts on R and RStudio.
- Produced reports and dashboards for government use.
Data Modeler
Ministry for Primary Industries
- Developed a model for agricultural greenhouse gas emissions for use by the New Zealand government for IPCCC disclosures and to inform public policy.
- Wrote extensive documentation to ensure project viability after the end of my contract.
- Provided training to permanent team members on how to use and change the model.
- Designed custom data structures to efficiently store intra-process data.
- Delivered the project on time and to the agreed specification.
Junior Machine Learning and Data Engineer
Hargreaves Lansdown
- Developed machine learning models for resource forecasting, customer segmentation, and propensity modeling.
- Wrote ELT pipelines to ingest data from legacy systems to a Hadoop cluster.
- Trained and mentored junior team members in R and Python.
- Built reports and dashboards in Shiny and SSRS (SQL Server Reporting Services).
Operations MI and Reporting Manager
Hargreaves Lansdown
- Built the operations data team from the ground up. Recruited, trained, and managed the team.
- Worked with management from the C-suite level down to determine the reporting needs for the operations department. Developed a suite of reports to meet requirements as far as was technically feasible.
- Developed new reports to make operational processes and risk management easier and more efficient.
- Performed ad hoc analysis work on request and supervised junior team members to do the same.
- Managed team members, including carrying out performance reviews, training, setting personal development plans, and providing career advice and support.
Experience
levitate
https://www.lewinfox.com/levitate/icecream
https://www.lewinfox.com/icecream/This is an R port of github.com/gruns/icecream.
foodwebr
https://www.lewinfox.com/foodwebr/lambdar
https://www.lewinfox.com/lambdar/• An R runtime (thanks to github.com/mdneuzerling/r-on-lambda).
• Tools to build, test and deploy Docker containers containing your code.
The process is simple. You write your code as usual, decorate your Lambda function with a roxygen-style `@lambda` tag, and `lambdar` does the rest. It’s designed to drop on top of your existing work with almost no changes to your code.
Skills
Libraries/APIs
Pandas, NumPy
Tools
Terraform, Git, GitHub, Tableau, Microsoft Power BI, Apache Sqoop
Languages
R, SQL, Python, Snowflake
Paradigms
Business Intelligence (BI), ETL, DevOps, Azure DevOps
Storage
DB, Microsoft SQL Server, Databases, Amazon S3 (AWS S3), Data Lakes, Data Pipelines, MySQL, Apache Hive, Azure Blobs
Frameworks
RStudio Shiny, Hadoop, Spark
Platforms
Linux, RStudio, AWS Lambda, Amazon Web Services (AWS), Visual Studio Code (VS Code), Apache Kafka, Databricks, Azure
Other
Data Engineering, Data Analysis, Data Analytics, Data Visualization, Data, Data Build Tool (dbt), Machine Learning, Team Management, Stakeholder Engagement, Serverless
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