Experience

Work

Feb 2022 - Present: Software Engineer at Ascenda

• Led infrastructure-wide initiatives across a 6-engineer team to optimize platform reliability, scalability, and developer velocity.
• Drove Kafka adoption, enabling real-time, high-throughput event processing across critical systems; improved responsiveness and decoupling at scale.
• Built an automated multi-tenant onboarding system, cutting provisioning time by 6x and reducing operational overhead by 90%.
• Spearheaded an observability initiative: built 50+ dashboards and shipped 2,000+ telemetry metrics, reducing incident response time by 66%.
• Integrated advanced authentication protocols (FIDO, Google Authenticator) to improve security and regulatory compliance.

Tech: Go (some services), Ruby, Kafka, Redis, AWS, Kubernetes, Postgres

Feb 2021 - Feb 2022: Software Engineer at Zendesk

• Led end-to-end migration of hundreds of millions of records from Riak to AWS Aurora, improving read/write throughput and reducing latency.
• Implemented robust smoke & integration test infrastructure to harden deployment pipelines for the Chat platform.
• Developed observability systems across multiple services, reducing MTTR and improving cross-team troubleshooting efficiency.

Tech: Golang, Python, Redis, Kafka, AWS, Kubernetes, MySQL, Aurora

June 2019 - Feb 2021: Software Engineer at Ascenda

• Built a fully OpenID-compliant authentication platform, capable of SSO integration with banking systems in <1 week.
• Developed tooling to automate and accelerate service onboarding to the auth platform, cutting integration effort by 70%.

Tech: Kafka, Redis, Postgres, AWS, Kubernetes, Ruby

Nov 2018 - May 2019: Software Engineer at SalesWhale

• Rebuilt user onboarding pipelines, slashing onboarding time from days to minutes via automation and flow redesign.
• Optimized Gmail/Outlook integration stack, dropping peak error rates from 30% to <5%.

Tech: Redis, Postgres, AWS, Ruby, SQS

July 2018 - Jun 2019: Software Engineer at StadiumGoods

• Designed and deployed real-time pricing recommendation engine, enabling dynamic feedback to sellers.
• Built scalable API Gateway to support high-volume mobile clients.

Tech: AWS, Redis, Postgres, Ruby

Sep 2015 - July 2018: Software Engineer at TINYpulse

• Scaled backend infrastructure to support a 2x user base growth with minimal downtime.
• Refactored critical systems including survey engine (10x faster) and question management module, significantly improving performance and time-to-market.
• Designed Central Auth module, laying the groundwork for microservice transition.

Technology: Redis, MySQL, Elasticsearch, MongoDB, Ruby, Heroku

Dec 2014 - Aug 2015: Software Engineer at PLZ

• Developed real-time betting system with sub-second latency and high concurrency support.
• Engineered a high-performance Ruby API server (1,000+ RPS) on minimal infrastructure.

Tech: Redis, Postgres, Ruby, DigitalOcean

Jun 2012 - Dec 2014: Software Engineer at EastAgile

• Delivered performant apps for Silicon Valley startups in fast-paced agile cycles.
• Improved transaction rendering speed 40x (120s → 3s) for InDinero through query optimization.
• Mentored interns and helped scale dev processes for efficiency.

Tech: Redis, Postgres, MySQL, Elasticsearch, Heroku, Ruby

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.