David Pui, Developer in Melbourne, Victoria, Australia
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David Pui

Verified Expert  in Engineering

Solutions Architect and Developer

Melbourne, Victoria, Australia
Toptal Member Since
January 30, 2023

David is a senior architect specializing in solutions architecture, business architecture, information and data architecture, and enterprise architecture. He has in-depth experience across a diverse range of industries, such as banking and finance, insurance, freight and transportation, utilities, gaming and entertainment, retail, government, consulting, and telecommunications. David is an expert in digital, data, and cloud transformation and cybersecurity risks and compliance.



Preferred Environment

Amazon Web Services (AWS), Azure, Google Cloud Platform (GCP), IBM Cloud

The most amazing...

...projects I've worked on involved digital wallet payments services, headless apps, a cloud retail-as-a-service solution, enterprise data archiving, and more.

Work Experience

Enterprise and Solutions Architect

2022 - 2022
The Blackstone Group
  • Developed the enterprise architecture solutions blueprint for a digital fabric transformation focusing on business and technology. Identified business and technology capabilities and aligned strategic and operational drivers.
  • Analyzed cashless and identity digital touchpoint solutions for gaming and non-gaming ecosystems throughout the customer journey, focusing on gaming first to ensure strategic risks and compliance with digital wallet enablement.
  • Reviewed the Azure Customer Management Microservice Kubernetes Service. Recommended containerization improvements, using a service mesh to provide the adoption of the microservices architecture style, and the use of Apache Kafka.
  • Revised the state of the customer and loyalty management user accounts and conducted an assessment of how the new payment services provider could securely integrate with the existing technology landscape. Ultimately, recommended strategic solutions.
Technologies: Enterprise Application Architecture, Enterprise Architecture, Solution Architecture, Digital Payments, Ayden Web SDK, Mobile Payments, .NET, Azure, Azure PaaS, Azure Service Bus, Azure Application Gateway, Azure App Service, Azure Logic Apps, Azure Functions, Azure Web Application Firewall, Amazon Web Services (AWS), AWS Internet Gateway, AWS Direct Connect, ExpressRoute, Customer Relationship Management (CRM), Loyalty Management, Know Your Customer (KYC), Salesforce, South Korea, IGT systems, Anti-money Laundering (AML), PCI DSS, Personally Identifiable Information (PII), NIST, Consumer Data Rights (CDR), GDPR, Splunk, Google Cloud Platform (GCP), RabbitMQ, Microservices Architecture, Azure Kubernetes Service (AKS), Service Meshes, Apache Kafka, Distributed Ledgers, Digital Wallets, Blockchain & Cryptocurrency, Node.js

Senior Solutions Architect

2021 - 2021
Australian Government Department of Defence
  • Established the enterprise architecture blueprint for data archiving solutions and presented it for endorsement to the BISS senior leadership team.
  • Contributed to the development of BISS's data and information governance policies. Provided fundamental architectural principles with a particular focus on data and information architecture principles and data management lifecycle.
  • Conducted mini market scans on enterprise data vault solutions with key vendors. Provided product architecture assessments and recommendations based on impacts on the current state, risks, and costs and aligned with the Department of Defence.
  • Developed a conceptual data model based on Dan Linstedt's Data Vault 2.0 best practices, using data concepts of Satellites, Links, and Hubs for a chosen defense legacy app and data indicated to be archived in the enterprise data vault.
Technologies: Enterprise Architecture, Solution Architecture, Data Modeling, Application Architecture, Information Architecture (IA), Data Architecture, Data Governance, Data Strategy, Enterprise, Personally Identifiable Information (PII), SWOT Analysis, Data Analysis, Data Vault 2.0 Modeling, Data Vaults, Vendor Management

Enterprise Architect

2019 - 2020
AIA Group
  • Served as the Enterprise Data Architect for the mergers and acquisitions program, successfully leading the migration of 180+ business systems and their complex integrations from CMLA to AIA's on-premise and cloud platforms.
  • Directed the modernization of AIA's Group Insurance Pulse and Intel Hub program at both tactical and strategic levels and provided advanced business analytics and data visualization reports for group trustees.
  • Ran a digital and data partnership distribution model to launch strategic products bundling across CBA and AIA Australia, introducing the omnichannel customer journey featuring web chat, telesales, data-driven approval, and a quote-and-apply tool.
  • Managed AIA-CBA shared services, including MS Teams, Microsoft 365, and Atlassian Cloud with Jira and Confluence, focusing on enterprise security enablement covering strategic information protection, data loss prevention (DLP), and data sovereignty.
  • Developed an end-to-end solution architecture to enable Part 9 Australia Federal Court and APRA share sale agreement to be completed by providing end-to-end significant event notifications (SEN) to APRA, Federal Court, customers, and group trustees.
  • Led Day 2 CFS business operating model, tactical and strategic model, and Colonial First State divestments to KKR. Policy underwriting and decision-making were under CMLA operations, and AIA's new functions needed to be operational by Day 2.
Technologies: Enterprise Architecture, Solution Architecture, Enterprise Application Architecture, Enterprise Application Integration (EAI), Enterprise Security Architecture, Data Architecture, Enterprise, Technology Strategy & Architecture, Digital Strategy

Modernizing a Legacy POS

Modernized a legacy POS with headless POS, headless apps, and a cloud-based retail-as-a-service solution.

I designed the end-to-end solution architecture for Australia Post using OneView Commerce for a unified commerce approach delivering a retail-as-a-service solution, headless apps, and cloud solutions. Focusing on transactions management, products and services, promotions, cash management, back end, financial processing, and integrations.

Digital Fabric Transformation: Cashless and Identity Management Solutions for Gaming and Non-Gaming

Worked both as an enterprise and a solutions architect in the development of the enterprise architecture solutions blueprint of a digital fabric transformation, focusing on business and technology. I presented the high-level conceptual architectures to the senior leadership team that used them to obtain endorsements from Gaming Labs International for the approval of the new Blackstone Investments Sydney Casino opening.

I also assisted in end-to-end solutions architecture and design of the proposed closed-loop digital wallet payments ecosystems for gaming and non-gaming ecosystems. We started by evaluating the pros and cons of open-loop, closed-loop, or restricted closed-loop systems and brainstorming the use of digital EMV cards, NFC tags, and RFIDs across numerous Agile workshops. We focused on digital ledger solutions using EonX payments services residing on the AWS Cloud platform, where the front-end and customer wallets account were linked. In addition, we handled data integration to internal gaming and non-gaming customers and loyalty management platforms residing on the Azure Cloud platform services, on-premise data centers, and Salesforce CRM.

Furthermore, I provided improvements to the Azure microservices architecture.
1992 - 1994

Master's Degree in Business Administration (MBA)

Victoria University of Wellington - Wellington, New Zealand

1983 - 1986

Bachelor of Technology with Honors in Computer Technology

Massey University - Palmerston North, New Zealand


Certified Agile Business Architect

EA Principals


Digital Transformation: From AI and IOT to Cloud, Blockchain and Cybersecurity

Massachusetts Institute of Technology


MCSA: Cloud Platform - Certified 2018



Exam 533: Implementing Microsoft Azure Infrastructure Solutions



Exam 535: Architecting Microsoft Azure Solutions



AWS Certified Solutions Architect - Associate



Java Enterprise Edition 5 Enterprise Architect Certified Master Exam (Part 1)



The Open Group Certified: TOGAF 9 Certified

Open Group


The Open Group Certified: TOGAF 9 Foundation

The Open Group


Azure Cognitive Services, Node.js, Experian, React-JSS, React


Azure HDInsight, Azure IoT Hub, AWS ELB, AWS IAM, AWS Fargate, IBM Cognos, Tableau, Microsoft Power BI, Oracle BAM, Oracle Business Process Management (BPM), Oracle ERP, Oracle RAC, Azure Active Directory B2C (ADB2C), Azure Logic Apps, Azure IoT Suite, IBM WebSEAL, IBM InfoSphere (DataStage), IBM Watson, Microsoft Dynamics CRM, Oracle AIA, TIBCO ActiveMatrix BPM, Salesforce CPQ, Dynamics Field Service, ELK (Elastic Stack), Node-RED, MQTT, Azure Kubernetes Service (AKS), NGINX, IBM DataPower, IBM InfoSphere Optim, IBM InfoSphere Master Data Management (MDM), Cisco UCCE, Microsoft Power Apps, Microsoft Dynamics 365 for Finance and Operations, IBM Maximo, Oracle Fusion Financials, TIBCO Enterprise Message Service (EMS), Salesforce Einstein, Amazon Simple Queue Service (SQS), Amazon Simple Notification Service (Amazon SNS), AppDynamics, Amazon CloudWatch, AWS CloudFormation, CircleCI, Postman, Looker, Azure Application Gateway, Azure Web Application Firewall, Azure App Service, Splunk, RabbitMQ, Salesforce Wave, SAP S/4HANA, SAP SuccessFactors


AWS HA, AngularJS, Windows PowerShell, Electron, .NET


Management, Enterprise Application Architecture, Enterprise Application Integration (EAI), Microservices Architecture, Application Architecture


Perl, Java 8, HTML, COBOL, CICS, SAS


Amazon Web Services (AWS), Azure, Azure SQL Data Warehouse, Azure PaaS, AWS Lambda, IBM WebSphere, Azure Functions, Dedicated SQL Pool (formerly SQL DW), Google Cloud Platform (GCP), AWS Elastic Beanstalk, Apache Kafka, Salesforce, webMethods, AS/400, Amazon Alexa, Microsoft Power Automate, Firebase, Azure Event Hubs, Daon, Twilio, Voiceflow


Azure SQL, Azure DocumentDB, Amazon S3 (AWS S3), AWS Elastic File System, Azure Queue Storage, Azure Blobs, IMS DB, Oracle 10g, Azure Table Storage, Azure Cosmos DB, MongoDB, CouchDB, Amazon DynamoDB, Google Bigtable, PostgreSQL, Google Cloud Storage, Datadog

Industry Expertise

Life Insurance


Oracle CRM On Demand, Oracle Hyperion Planning, Computer Science, Data Modeling, Enterprise Architecture, Solution Architecture, Data Architecture, Security Architecture, Customer Experience, Genesys, ipSCAPE, Architecture, API Integration, Platforms, Infrastructure Architecture, Azure Service Bus, Google BigQuery, AWS Direct Connect, Amazon Route 53, IBM InfoSphere Information Governance Catalog, IBM WebSphere Service Registry and Repository, Dynamics CRM 365, IBM Integration Bus (IIB), Computer Engineering, Artificial Intelligence (AI), Operations Research, Engineering, Production & Quality, IBM Security Guardium, Platform as a Service (PaaS), Avaya Software, PeopleSoft CRM, Workforce Management (WFM), DXC Technology Policy Administration System, Data Management, Informatica, SAP, Financials, Google, Interconnected Networks, IBM Cloud, Amazon Kinesis, IBM WebSphere DataPower SOA Appliances, IBM SAN, Blockchain & Cryptocurrency, Programming, Manufacturing, Control Systems, Amazon EventBridge, Mobile POS, Online Payments, Card Payments, Billing, Message Queues, Business Architecture, Enterprise Security Architecture, Technology Strategy & Architecture, Digital Strategy, Digital Payments, Ayden Web SDK, Mobile Payments, AWS Internet Gateway, ExpressRoute, Customer Relationship Management (CRM), Loyalty Management, Know Your Customer (KYC), South Korea, IGT systems, Anti-money Laundering (AML), PCI DSS, Personally Identifiable Information (PII), NIST, Consumer Data Rights (CDR), GDPR, Service Meshes, Distributed Ledgers, Digital Wallets, Information Architecture (IA), Data Governance, SWOT Analysis, Data Analysis, Data Vault 2.0 Modeling, Data Vaults, Vendor Management, InfoSphere Data Architecture, SAS Visual Analytics, Supervisory Control & Data Acquisition (SCADA), SAP CRM, Payroll & Benefits, Enterprise, Data Strategy

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