Experience

Work

Feb 2022 - Present: Software Engineer at Ascenda

• Implement enhancements to various authentication and authorization features, bolstering security and streamlining user access controls.
• Lead the Observability initiative across the company, implementing robust monitoring and logging systems to ensure efficient troubleshooting and proactive issue resolution.
• Manage a high-performing team, providing leadership, mentorship, and fostering professional growth among team members.
• Collaborate with multiple teams to ensure informed design decision, in order to deliver a new product

Feb 2021 - Feb 2022: Software Engineer at Zendesk

• Improve Observability for various services
• Improve smoke and integration tests coverage for Chat Product
• Work on migrating hundred of millions records from Riak to AWS Aurora

June 2019 - Feb 2021: Software Engineer at Ascenda

Lead Guardhouse team:

• Design and implement from ground up the authentication service (Guardhouse), which conforms with OpenID standard. The system is flexible and extensible, can be integrated with most bank SSO systems within a few days.
• Design and implement internal tools for all services to integrate with Guardhouse, which boosts their productivity and reduces implementation time.

Nov 2018 - May 2019: Software Engineer at SalesWhale

• Revamp import/enrolment flow to simplify the process
• Refactor critical part of Gmail/Outlook integration to make the system more stable

July 2018 - Jun 2019: Software Engineer at StadiumGoods

• Maintain multiple applications to connect with suppliers.
• Build price notifications and recommendations for sellers.
• Build API Gateway, which supports Mobile App to connect to various services.

Sep 2015 - July 2018: Software Engineer at TINYpulse

• Double the userbase from 150k to 300k users without any major issues
• Refactor survey generating tool to make it 10x faster
• Rework the Question Management module (most requested feature) to make it faster and more flexible
• Build Central Authentication module as the foundation of the transformation of TINYpulse from a monolithic application to a platform

Dec 2014 - Aug 2015: Software Engineer at PLZ

• Develop betting system which supports real-time betting
• Build API server in Ruby which can serve upto 1k requests/sec on a single standard Digital Ocean instance

Jun 2012 - Dec 2014: Software Engineer at EastAgile

• Develop several RoR applications for different startups in Silicon Valley
• Most notably: improve loading time for transactions page of InDinero from 120s to 3s
• Train new intern and improve company software process

Sep 2011 - Mar 2012: Intern at AILAB, HCMC University of Science

• Build tool to pre-process raw data for ISago, a speech processing application which can help people search for food/location in Saigon using Vietnamese.

Jun 2011 - Sep 2011: Intern at eSilicon

• Develop SKILL program to generate chip design from specification data

Education

• Bachelor Degree at Ho Chi Minh City University of Science
• Third prize in HCMUS 2010 ACM-ICPC contest
• Third prize in Vietnam 2011 ACM-ICPC contest

Community contribution

vietnamrb

I am admin of Ruby-Vietnam, a community of ~2000 developers in Vietnam. From 2015, I help Trung Le, founder of the community, organize events in Ho Chi Minh City and Ha Noi. There has been more than 20 meetups and hacknite since then.

Below are a few talks I present at the meetups:

• hanoi.rb 2014 - Using Arel to refactor big queries
• hcmc.rb 2015 - Introduce to Warden
• hcmc.rb 2016 - Behind Rails magic
• TINYpulse 2018 - Better reviewer
• TINYpulse 2018 - Isolation Levels
• Ascenda 2019 - Isolation Levels
• Ascenda 2019 - Introduction to Fuzzing

GIVEasia

In 2015-2016, I helped GIVEasia, a crowd-funding platform for charity events, as volunteer developer. The most notable feature that I developed there is the recurring payment module.

Kipalog

From 2018, I work on Kipalog, a knowledge sharing platform for Vietnamese developers, to improve performance and test coverage. Occasionally, I also develop new features to improve the user experience.