Phan Liem

What changed where I worked

The measurable results behind the roles. Grey shows where things started; green shows where they ended up.

Products I've built

Tools I designed and shipped under TechArk.

Where I've worked

From building warehouses by hand in 2010 to running data and AI for a company today. Open any role for the details.

1. 08/2025 – now

   Head of Data Science

   Show detailsYes4All Trading Services

   • Built and lead the company's data team, focused on automation, reporting and data quality.
   • Moved the data platform onto a lakehouse stack, optimizing thousands of data flows and tables and raising uptime from 70% to 95%.
   • Set up data governance: policies, access rules and an OpenMetadata catalog holding the shared metric definitions and glossary.
   • Designed and launched an AI-powered flow that turns the standardized metrics into business reviews automatically.
   • Introduced AI-driven data reconciliation that checks figures across sources, keeping reported numbers consistent.
   • Applied analytics and machine learning to purchasing, inventory, sales forecasting and product segmentation.
   • Used LLMs on customer feedback and other text data to surface sentiment and emerging trends.

   Tools: Trino, Apache Iceberg, Airflow, OpenMetadata, Ansible, PostgreSQL, Power BI, Python

2. 08/2020 – 07/2025

   Three roles in data and customer experience

   Show detailsAIA Vietnam

   Data Analytics & Governance 03/2025 – 07/2025

   • Led the data governance program and secured leadership approval for every initiative presented.
   • Kept data accurate across its lifecycle, working with IT to raise data quality.
   • Analyzed claims, policy and customer data and briefed leadership on findings.

   Customer Experience & Transformation 04/2023 – 02/2025

   • Used data to redesign strategic customer journeys, lifting AIA app adoption to 70%.
   • Streamlined operational processes, pushing the straight-through processing rate above 80%.
   • Ran pain-point workshops, turned survey feedback into action and wrote service guidelines.

   Customer Analytics 08/2020 – 03/2023

   • Re-engineered data flows, cutting data preparation time from 15 days to 1 day.
   • Built Power BI dashboards and presented insights to leadership.

   Tools: Power BI, Microsoft Fabric

3. 06/2018 – 07/2020

   Data Analyst & Researcher

   Show detailsFossil

   • Built machine learning models to predict customer behavior and deployed them on AWS.
   • Validated models with A/B tests and explored large datasets for patterns.
   • Proposed new data initiatives and presented business cases to decision-makers.

   Tools: AWS, Power BI

4. 07/2017 – 01/2018

   Head of Data & Business Intelligence

   Show detailsLiquid (formerly QUOINE)

   • Directed BI tool development for several business units and oversaw executive reporting.
   • Worked with engineering, marketing and operations on structured and unstructured data.
   • Found where data could drive improvements and turned trends into recommendations.

   Tools: AWS S3, Glue, Athena, Redshift, Tableau

5. 05/2016 – 06/2017

   Business Intelligence Manager

   Show detailsTiki

   • Led a team of three BI analysts.
   • Designed and built the data warehouse and BI dashboards from scratch, with OpenERP as a core source.
   • Prepared the data for the fundraise that brought in JD.com (US$44M+).
   • Delivered routine and ad-hoc reporting plus competitor analysis.

   Tools: MySQL, Sisense, OpenERP

6. 01/2015 – 04/2016

   Senior Business Intelligence Developer

   Show detailsXSPERA

   • Launched a production-ready SharePoint product that centralized documents and workflows.
   • Managed projects through the full development cycle and advised clients.
   • Built warehouses, ETL and dashboards, and tuned databases for faster reporting.

   Tools: SQL Server, SSIS, SSAS, SSRS, SharePoint

7. 04/2010 – 12/2014

   BI Developer to Senior BI Developer

   Show detailsDXC Vietnam (formerly CSC)

   • Delivered three enterprise projects for healthcare, telecom and insurance clients, each with its own data warehouse and hundreds of pipelines.
   • Led BI projects from analysis to delivery: warehouses, ETL, OLAP cubes and dashboards.
   • Later moved to production support, planning installs and upgrades with minimal disruption.

   Tools: SQL Server, MySQL, SSIS, SSAS, SSRS, Informatica, Pentaho

Tools I work with

The stack I've used in production, newest first.

Languages

Python, SQL

AI and ML

Hugging Face, machine learning, generative and agentic AI

Lakehouse and cloud

Trino, Apache Iceberg, Microsoft Fabric, AWS

Databases

PostgreSQL, SQL Server, MySQL

Pipelines

Airflow, AWS Glue, SSIS, Informatica, Pentaho

BI

Power BI, Tableau, Sisense, SSAS, SSRS

Governance and ops

OpenMetadata, Ansible

Leadership

Digital transformation, change management, Agile, customer experience