Richard Dam
APIs Developer
Location
Ho Chi Minh City, Ho Chi Minh, Vietnam
Toptal Member Since
July 10, 2019
With over a decade of experience behind him, Richard is a seasoned software engineer and manager—leading engineering and product teams to build multiple products in payment and eCommerce fields. He recently has served as the head of engineering for GO VIET, an Uber-like platform, and as a CTO of a fintech that he co-founded. Richard also has a solid CS background, so he’s passionate about software system architecture and cloud computing.
Richard is available for hire
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Early Stage Startup
Python, APIs, Azure, Flask, Google Cloud, OpenAI GPT-3 API
Freelance Client
Python, Amazon Web Services (AWS), Azure, Kubernetes, ChatGPT, OpenAI GPT-3 API...
Polymer Solutions, Inc
Python, AWS Lambda, Amazon Web Services (AWS), Data Loss Prevention (DLP)...
Experience
Python - 8 yearsJava - 7 yearsAPIs - 7 yearsKubernetes - 5 yearsFintech - 4 yearsMicroservices Architecture - 4 yearsDocker - 4 yearsFlask - 3 yearsLocation
Availability
Part-time
Preferred Environment
Docker, Git, Sublime Text, PyCharm, Zsh, MacOS
The most amazing...
...product I've built is a recommendation engine for a social network, offering users with personalized experience in their activity feeds.
Work Experience
2023 - 2023
Python Developer
Early Stage Startup
- Experimented and applied pre-trained AI models for news article summarization.
- Optimized an app by applying OpenAI for certain NLP tasks, including text similarity, summarization, and script generation.
- Refactored the Flask app, modularized different logic components, and created Docker and deployment scripts.
Technologies: Python, APIs, Azure, Flask, Google Cloud, OpenAI GPT-3 API
2021 - 2023
Engineering Manager
Freelance Client
- Designed, architected, and implemented a multi-tenant chatbot platform optimized for the education industry.
- Created an identity management system that enables single sign-on for all the portals in the system and federated identity for the clients.
- Created integrations with multiple LMS using LTI v1.1 and LTI v1.3.
- Built a Microsoft Teams app to make the chatbot available on the Teams personal and group chats.
- Built CI/CD pipelines, and automated infrastructure provisioning using IaC.
Technologies: Python, Amazon Web Services (AWS), Azure, Kubernetes, ChatGPT, OpenAI GPT-3 API, GitHub, Flask, REST APIs, SAML, Single Sign-on (SSO), OAuth 2, OpenID Connect (OIDC), Auth0, Back-end, Terraform, Microservices
2021 - 2021
Software Engineer
Polymer Solutions, Inc
- Optimized processing time of lambda apps around 20-30%.
- Restructured the app's service layer to make it compatible with Lambda, API, and CLI.
- Set up CI/CD pipelines on Bitbucket and provisioned the app on AWS using Terraform.
Technologies: Python, AWS Lambda, Amazon Web Services (AWS), Data Loss Prevention (DLP), Terraform, Personally Identifiable Information (PII), GitHub, Back-end
2019 - 2020
Consultant
GAPO Technology JSC
- Assembled a product team to revamp the activity feed of a social network.
- Redefined the activity feed as a data-driven product within the social network; defined the metrics and KPIs for the product.
- Built an experimentation platform for developing a continuously improving product, supporting multi-variate testing for different product components.
- Developed a recommendation engine as a core of the activity feed to personalize the activity feed of users.
- Constructed data pipelines, including both streaming and batching to maintain feature data of the recommendation engine and support BI and data analysis. Data stack: Kafka, Cassandra, Airflow, BigQuery.
Technologies: Apache Airflow, Google Cloud Platform (GCP), Data Pipelines, Apache Kafka, Python, Social, Flask, GitHub, Back-end, Microservices
2018 - 2019
Head of Engineering
GO VIET Technology Trading Company Limited
- Assembled a product team to deploy ride-hailing and food delivery products in Vietnam; coordinated with a regional engineering team to maintain and continuously improve products.
- Maintained a data warehouse and developed a new data pipeline, which ensured data integrity and accessibility for BI and fraud prevention activities. Technologies used: BigQuery, Google Cloud Storage, Airflow, Pandas, and Kafka.
- Deployed and maintained microservices on Google Compute Engine and Google Kubernetes Engine.
- Integrated a system with banks for a money-payout process.
- Established IT infrastructure and information security policies.
- Created real-time monitoring dashboards with Grafana and InfluxDB.
Technologies: SQL, Grafana, Helm, Protobuf, Kubernetes, Google Cloud Platform (GCP), BigQuery, Apache Airflow, Java, Python, OpenID Connect (OIDC), GitHub, Back-end, Microservices
2015 - 2018
Co-founder | Chief Technology Officer
TDC JSC
- Co-founded and led an engineering and product team.
- Worked on fintech, banking integrations, and conversational AI.
- Created an eWallet that enables users to make P2P money transfers via a phone number, bank account, and social network. Technologies used: Java with Spring Framework, MySQL replication, microservices architecture with Docker, and Google Protobuf.
- Implemented direct integration with the core banking API of some Vietnam banks for wallet top-ups and withdrawal transactions.
- Developed a management platform for transactions management and monitoring.
- Created a rule-based chatbot platform for financial use cases, supporting natural language processing for bank transfer, saving account creation, and service payments.
- Integrated a system with eCommerce partners to purchase products and services on the eWallet app.
- Provisioned on-premise infrastructure in a data center.
Technologies: Protobuf, Django, Python, Docker, Spring, Java, OpenID Connect (OIDC), GitHub, Back-end
2013 - 2015
Solution Architect | Technical Presales
SmartOSC Corporation (North America)
- Advised clients in North America area wanting to build an eCommerce platform on their strategy and development plan.
- Architected a high-level system, handled the project scoping, and generated the development timeline based on customer needs.
- Traveled and conducted face-to-face meetings with clients in the North American area.
- Provided technical support to existing customers, maintaining relationships with customers.
Technologies: PHP, Drupal, Symfony, Magento, eCommerce
2010 - 2013
Senior Software Engineer
SmartOSC Corporation
- Managed a development team of 10 engineers to create an eCommerce system with seven million+ SKUs; used PHP, Symfony, MySQL replication, and PHPUnit.
- Led a team of five in the development of a CMS for US university sports teams to upload, stream and share videos of their sports games.
- Revamped a company's website to support metro design using PHP and Drupal.
- Developed websites for clients in different sectors using WordPress and Drupal.
- Maintained and supported an eCommerce platform written in PHP/CodeIgniter for a multi-brand fashion company in Europe.
Technologies: WordPress, Drupal, MySQL, Symfony, eCommerce
2008 - 2010
Search Engine Developer
Tinh Van Telecom
- Developed custom text processors and extractors for a web search engine in Python.
- Created a web crawler for blog searches using Python and a thread pool library.
- Built a blogging platform with PHP and MySQL based on the Facebook app, enabling users to create blog entries on Facebook.
- Improved the blog entries and bloggers' ranking with a PageRank-like algorithm.
- Developed a content management system with PHP and Yii framework.
Technologies: MySQL, Yii, PHP, Python
Experience
Social News Feed System
We built a News Feed system for a social network with a few million daily active users. The system is a sub-product of the social network, in which we designed the system using a data-driven mindset. We first formed the metrics for a successful News Feed and then implemented the system to achieve the target KPI.
Technically the system was designed using microservices best practices and strictly followed the 12-factor app methodology. We used Kafka for streaming data and Airflow for batching data for the machine learning service. The heart of the News Feed system was a hybrid recommendation engine in which we tried to create several different models for different customer segments. We also made an experimentation service to set up an experiment to improve the model quickly.
Underlying tech stack includes:
• Microservices for the architecture
• Python with Flask for all the APIs
• Kafka and Airflow for data streaming and batching
• Cassandra and MongoDB for the database
• Docker and GKE for containerization and deployment
• GitLab and ArgoCD for code revision control and CI/CD
Technically the system was designed using microservices best practices and strictly followed the 12-factor app methodology. We used Kafka for streaming data and Airflow for batching data for the machine learning service. The heart of the News Feed system was a hybrid recommendation engine in which we tried to create several different models for different customer segments. We also made an experimentation service to set up an experiment to improve the model quickly.
Underlying tech stack includes:
• Microservices for the architecture
• Python with Flask for all the APIs
• Kafka and Airflow for data streaming and batching
• Cassandra and MongoDB for the database
• Docker and GKE for containerization and deployment
• GitLab and ArgoCD for code revision control and CI/CD
Mobile eWallet
We created a mobile eWallet on Android and IOS, aiming to make the money transfer experience as simple and as easy as possible. The eWallet facilitated direct money top-ups and withdrawals from a bank account via a host-to-host integration with the bank. It also supported P2P money transfers via a phone number and social network and product/service purchases from third-party eCommerce vendors.
Underlying Technologies:
• Microservices for the architecture
• Java with Spring Framework and Python with Django for services
• MySQL for the database
• Protobuf for interservice communication
• OAuth 2 for user authentication and authorization
• Docker for containerization
• GitLab for code revision control and CI/CD
Underlying Technologies:
• Microservices for the architecture
• Java with Spring Framework and Python with Django for services
• MySQL for the database
• Protobuf for interservice communication
• OAuth 2 for user authentication and authorization
• Docker for containerization
• GitLab for code revision control and CI/CD
Financial Chatbot Platform
We helped a bank to build a chatbot platform for financial services. It worked as another communication channel between the bank and its customers. Users could inquire about the balance, transfer money, create a savings account, and buy value-added services from an instant-messaging app like Facebook Messenger.
At the core of the chatbot platform, there's a message queue aiming to stream users' chat messages to the rule-based processors and stream the replies to users. On top of the core, adapters enabled the platform to be integrated with multiple services, including Facebook Messenger, Zalo, and more.
With a microservices architecture and pub/sub pattern, the platform could be easily scaled up to process a few million messages per second.
At the core of the chatbot platform, there's a message queue aiming to stream users' chat messages to the rule-based processors and stream the replies to users. On top of the core, adapters enabled the platform to be integrated with multiple services, including Facebook Messenger, Zalo, and more.
With a microservices architecture and pub/sub pattern, the platform could be easily scaled up to process a few million messages per second.
Skills
Languages
Python, Java, Python 3, PHP, Bash Script, JavaScript, HTML5, SQL, C++, SAML
Frameworks
Flask, Spring, Django, Spring Boot, Symfony 2, JUnit, OAuth 2, Symfony
Platforms
iOS, Docker, Kubernetes, Google Cloud Platform (GCP), Amazon Web Services (AWS), MacOS, Drupal, WordPress, Magento, Amazon EC2, AWS Lambda, Drupal 8, DigitalOcean, Apache Kafka, Azure
Other
APIs, Back-end, Data Scraping, Data Warehouse Design, Fintech, Mobile Wallet, Mobile Banking, Chatbots, Data Warehousing, Web Crawlers, Recommendation Systems, Conversational UX, Natural Language Processing (NLP), GPT, Generative Pre-trained Transformers (GPT), Scripting, OpenAI GPT-3 API, eCommerce, Social, Stripe Subscriptions, Web Scraping, Machine Learning, Google Cloud Functions, Scraping, Data Loss Prevention (DLP), Personally Identifiable Information (PII), ChatGPT, Single Sign-on (SSO), OpenID Connect (OIDC)
Libraries/APIs
Protobuf, Stripe API, jQuery, Scikit-learn, Facebook API, OpenCV, Pandas, REST APIs
Tools
BigQuery, Google Kubernetes Engine (GKE), Zsh, Git, JetBrains, Postman, Grafana, Pytest, PyCharm, Sublime Text, Helm, Stripe Checkout, Ansible, Apache Airflow, ELK (Elastic Stack), Fluentd, Terraform, GitHub, Auth0
Paradigms
Microservices, Agile, Test-driven Development (TDD), Microservices Architecture, DevOps, Unit Testing
Storage
MySQL, Amazon S3 (AWS S3), Google Cloud Storage, Redis, MongoDB, Data Pipelines, PostgreSQL, Elasticsearch, InfluxDB, Cassandra, Google Cloud
Education
2013 - 2015
Master's Degree in Computer Science
Texas A&M University - College Station, TX, USA
2006 - 2010
Bachelor's Degree in Computer Science
VNU University of Engineering and Technology - Hanoi, Vietnam
Certifications
MAY 2019 - MAY 2021
Codility Golden Award for the Niobium 2019 Challenge
Codility