Nigel Chang, Developer in San Francisco, CA, United States
Nigel is available for hire
Hire Nigel

Nigel Chang

Verified Expert  in Engineering

Data Warehousing Developer

San Francisco, CA, United States
Toptal Member Since
April 1, 2019

Nigel is a senior software and data engineer on Cloud, Linux, AWS, GCP, Snowflake, Hadoop, and almost all computer and database platforms. He's led and contributed to eCommerce and self-driving startups as well as the world's largest brokerage, retail, semiconductor, communication, network, and storage enterprises on the data analytics, ETL data pipeline, transaction processing, self-driving, and data science teams.


Amazon Web Services (AWS), Amazon EC2, Amazon S3 (AWS S3), Redshift...
Apache Airflow, Snowflake, Amazon S3 (AWS S3), Docker Compose...
Amazon Web Services (AWS), REST APIs, Jira, Tableau, Python, MySQL, MongoDB...




Preferred Environment

Amazon Web Services (AWS), Python, Redshift, Hadoop, Snowflake, Linux

The most amazing...

...thing that I've worked on as the only available data engineer was a $200 million eCommerce startup to run 25+ data pipelines and support all business teams.

Work Experience

Senior Data Engineer

2020 - PRESENT
  • Performed as a member of the Workforce Staffing data engineering team. Developed ETL pipelines, data mapping, modeling, data lake, and data flow to fill labor order.
  • Developed Airflow DAG for tasks, operator, and connection with Python and SQL.
  • Worked with business intelligence engineers and a data analyst to create dashboards.
Technologies: Amazon Web Services (AWS), Amazon EC2, Amazon S3 (AWS S3), Redshift, CI/CD Pipelines, Python 3, Apache Airflow, Data Build Tool (dbt), SQL

Senior Data Engineer

2020 - 2021
  • Took part in the eCommerce ROI data engineering team. Developed ETL pipelines, data mapping, modeling, and data flow for 20+ advertising media sources, including Nielsen, Google, Amazon, Facebook, Twitter, OMD, and more.
  • Developed an Airflow DAG for tasks, operator, and a connection variable that brings data from AWS S3 into Snowflake.
  • Developed a data vault schema and table in Snowflake. Supported the Snowflake database, role, warehouse, schema, and table.
Technologies: Apache Airflow, Snowflake, Amazon S3 (AWS S3), Docker Compose, Kubernetes Operations (kOps), Data Build Tool (dbt), Argo CD, Jira, GitHub, Python 3, SQL

Data Engineer

2019 - 2020
  • Created a self-driving car fleet management system analytics, data pipelines, and ETL.
  • Used AWS Redshift, EC2, S3, Python, Database Migration Service, and MongoDB.
  • Developed data pipelines and data flow of vehicle heartbeats, and weather API data. Fed Tableau analytics dashboards.
Technologies: Amazon Web Services (AWS), REST APIs, Jira, Tableau, Python, MySQL, MongoDB, Document Management Systems (DMS), Amazon S3 (AWS S3), Amazon EC2, Redshift, SQL

Data Engineer

2019 - 2020
  • Developed a B2B customer contact hub dataset. Supported machine learning, AI, software renewal, NPS survey, and sales campaign automation.
  • Built a data pipeline framework, guidelines, production procedures, data architecture, and code review process. Led and educated junior Python developers.
  • Developed an internal Salesforce contact dataset and sync it with an external Salesforce object.
  • Migrated data foundation from Hadoop to Snowflake, GCP BigQuery, GCE, GCS, Airflow, and Cloud Gateway Server.
Technologies: Jira, GitHub, BigQuery, Google Cloud Storage, Google Compute Engine (GCE), Google Cloud Platform (GCP), Snowflake, JSON, Apache Hive, Hadoop, Spark SQL, PySpark, Python, Apache Airflow, Salesforce, SQL

Big Data Engineer

2017 - 2018
Western Digital
  • Developed and supported enterprise data management big data engineering for worldwide head and drive wafer fab production image and data ETL pipelines.
  • Rebuilt, managed, and tuned large production enterprise data management AWS Redshift clusters to allow large volume pipelines and user queries.
  • Supported AWS Redshift, Redshift Spectrum, ElasticSearch, Kinesis, S3, EC2, RDS, MySQL, PostgreSQL, Aurora, and CloudWatch. Managed Control-M, Spotfire, and SnapLogic ETL.
  • Supported the wafer images defect model machine learning platform.
  • Worked with Slack, Hadoop, Hive, Impala, Python, NumPy, SciPy, SVM, SVD, GitHub, Bitbucket, Jenkins, Tidal, Java, Jira, Wiki, and Confluence.
Technologies: Amazon Web Services (AWS), Elasticsearch, Bash, PostgreSQL, Amazon EC2, Amazon S3 (AWS S3), Python, Redshift, SQL

Lead Data Engineer

2015 - 2017
  • Developed and maintained an online shopping eCommerce data engineering, data analytics, 25 ETL pipelines, and a data warehouse as the only available data engineer.
  • Constructed and managed Salesforce eCommerce Cloud (aka Demandware), Square POS, eCommerce replication Percona FelexCDC, Adobe Omniture Marketing Cloud, Oracle Responsys, ScientiaMobile WURFL, Qualtrics, Zodiac, ShopKeep, Acuity, and RetailNext.
  • Developed data pipelines with various vendors using GitHub, Python, C/C++, Java, REST API, JSON, XML, CSV, TSV, Jira, and Slack.
  • Designed Azure migration of Azure SQL Data Warehouse, Blob Storage, and Linux VM.
Technologies: Amazon Web Services (AWS), PostgreSQL, MySQL, Python, Bash, Amazon EC2, Amazon S3 (AWS S3), Redshift, SQL

Software System Engineer

2002 - 2015
Charles Schwab
  • Built a new portfolio accounting system on Linux as the very first engineer.
  • Led the sparks team and built a cost basis accounting system and a reporting repository data warehouse.
  • Built and supported Eagle Investment Systems STAR and PACE products.
  • Supported and migrated the mainframe-based system to RedHat Linux/Solaris VMware server and 100TB+ scale Oracle 9/10/11/12 RAC/TAF/EMC/HDS based DataGuard/Golden Gate environments.
  • Developed and supported partitioning, parallel processing, ESP scheduling, high availability/failover, disaster recovery, Tivoli monitoring, Splunk, and Zenoss.
  • Implemented and supported both the development and production of OLTP, OLAP, ETL, distributed Messaging (MQ), iPlanet/Apache, Application Server, Oracle 9/10/11/12 RAC databases, and DataGuard.
  • Built and supported multiple TB scale development and performance/volume/stress testing environments.
  • Developed systems and applications with Java, Perl, Shell, Python, SQL, PL/SQL, and XML languages.
  • Educated the team with SQL and RDBMS, MySQL/SQL Server, and a data-driven documents library.
Technologies: SQL, Bash, Perl, Red Hat Linux, Oracle, Linux

Enterprise Sales AI Data Engineering

Sales AI campaign data science required data pipeline and machine learning models. Major sources from external REST API, Webhook, and S3. Snowflake, GCP, Hadoop, and Hive. Primarily email and phone contact. Hadoop, Spark, PySpark, Hive, Google Could Platform, and Snowflake.

The pipeline includes eight tasks: data extraction and ingestion, data deduplication, data transformation, data incremental load, data filtering, offer data generation, offer motion data generation, and data enrichment. GitHub, JSON, XML, JIRA, Wiki, and Confluence. Fully and solely completed Hadoop to Snowflake migration. Incubated junior engineers.

eCommerce Data Pipeline Migration

Developed and supported 25+ eCommerce product, transaction, KPI, marketing, merchandising, planning, finance, fraud detection, LTV, Square, REST API, and fulfillment data pipelines single-handed. Migrated in-house built transaction and ETL pipelines AWS Redshift, MySQL, MongoDB, Postgres, EC2, S3, Data Migration Services to Salesforce Commerce Cloud and Azure. Tableau Server and desktop dashboards. Pipelined 20+ marketing partners including Google Analytics, Adobe Omniture, Oracle Responsys, and Salesforce Marketing Cloud. Python, Bash, JSON, XML, JIRA, Slack.

Brokerage Portfolio Accounting System

Build a new and first Linux and Oracle-based portfolio accounting system for the largest brokerage firm in the West Coast with 16 million customers.

Enterprise Data Management

Built wafer data ETL pipelines from wafer factories all over the world for the world's largest storage company. AWS Redshift, EC2, S3, Elastic Search, JSON, Python, Teradata, SQL Server, Oracle, and Control M. Re-created all the tables in Redshift to make it perform.

Self-Friving Analytics

Built data pipelines for self-driving car company fleet management system with real-time heartbeats, analytics dashboards, and products. AWS Redshift, EC2, MySQL, MongoDB. AWS DMS, Python, and JSON Tableau.
1986 - 1987

Master of Science Degree in Computer Science

Indiana University - Bloomington, Indiana

1978 - 1982

Bachelor of Science Degree in Engineering

National Taiwan University - Taipei, Taiwan


PySpark, REST APIs, NumPy, SciPy, Spark Streaming


MongoDB Shell, Jira, GitHub, Google Compute Engine (GCE), Amazon Elastic MapReduce (EMR), Cisco Tidal Enterprise Scheduler, Spark SQL, BigQuery, Docker Compose, Tableau, Google Cloud Dataproc, Google Cloud Composer, Apache Airflow, Kafka Streams




Python, C, Bash, SQL, Snowflake, Java, Perl, Python 3, C++




Amazon EC2, Google Cloud Platform (GCP), Linux, HubSpot, Oracle, Red Hat Linux, Amazon Web Services (AWS), Salesforce


MongoDB, Amazon S3 (AWS S3), MySQL, PostgreSQL, Apache Hive, Elasticsearch, JSON, Redshift, Google Cloud Storage, Google Cloud SQL, Google Cloud, Datastage


Machine Learning, Data Warehouse Design, Software Development, Google BigQuery, eCommerce, Data Warehousing, Tableau Server, Document Management Systems (DMS), Kubernetes Operations (kOps), Data Build Tool (dbt), Argo CD, CI/CD Pipelines

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.


Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring