Hi, I'm

Lê Hoàng Đức Liêm
I build things.

Solution Architect based in Saigon. I like solving problems, making systems work well, and learning something new along the way.

Ho Chi Minh City, Vietnam Solution Architect contact@liemlhd.com

About

Building systems that scale

I'm a Solution Architect and DevOps/SRE Lead with a strong foundation in backend engineering. Over the past decade, I've led teams at VNG Corporation (ZaloPay) and G-Group, where I optimized architectures, slashed infrastructure costs, and delivered platforms that handle millions of daily requests with high reliability.

My sweet spot is the intersection of system design, DevOps culture, and product thinking — I care about building things that are not just technically elegant, but that actually work well for users and the business. Currently exploring AI adoption to drive smarter automation and innovation.

Experience

Where I've worked

Apr 2023 — Present
Senior Solution Architect
G-Group / Gapo
Leading architecture and DevOps for scalable products supporting tens of thousands of daily active users. Rebuilt the data warehouse for 99.9% accuracy, improved file upload from barely usable (2.6MB/s) to full system throughput, and reduced infrastructure costs from $18k to $12k/month. Elevated platform SLA to 99.95% while championing GitOps and Infrastructure-as-Code practices.
Architecture DevOps GCP GitOps
Jul 2022 — Mar 2023
Senior Solution Architect
G-Group
Partnered with subsidiaries to stabilize platforms and reduce costs. Cut GCP costs for GPay by 30% through optimized instance types. Boosted GPay stability during Tet holiday peak — achieving transactions within 3s with zero errors, vs. a 30% error rate the previous year. Detected and resolved critical security vulnerabilities in the Tima system.
Payment Performance Security Cost Optimization
Jan 2021 — Jun 2022
Staff Engineer
VNG Corporation — ZaloPay
Led the Mobile Platform and MiniApp Platform squads, driving architecture decisions across teams. Reduced merchant onboarding time-to-market by 50% and cut customer support workload in half. Coordinated product and technical priorities to expand ZaloPay's merchant ecosystem.
ZaloPay MiniApp Platform Merchant Ecosystem
Apr 2019 — Jan 2021
Lead Software Engineer
VNG Corporation — ZaloPay
Spearheaded ZaloPay's infrastructure modernization with microservices. Founded the SRE team, establishing monitoring, SLAs/SLOs, and error budgets. Led Cloud Native and DevOps adoption across 50+ engineers, reducing deployment time from days to hours and cutting server costs by 30%.
Microservices SRE Cloud Native Fintech
Apr 2018 — Apr 2019
Senior Software Engineer — Team Lead
VNG Corporation — ZaloPay
Designed backend systems handling millions of daily requests at low latency. Reduced payment-related losses by 30% by redesigning payment and reconciliation modules. Led the transformation of a legacy application to Agile-driven development.
Backend Payment Agile
Mar 2015 — Apr 2018
Software Engineer
VNG Corporation
Developed and maintained APIs for VuiGame and Vip360 serving millions of users. Optimized database queries from 2s to under 200ms. Implemented high availability with ZooKeeper and contributed to the microservices migration.
Java API Database ZooKeeper

Skills

What I work with

Architecture & Design

System Design Microservices Event-Driven Domain-Driven Design API Design Data Modeling

Cloud & Infrastructure

GCP AWS Kubernetes Terraform Infrastructure-as-Code GitOps Nomad Consul Vagrant

Backend & Languages

Java Go REST APIs gRPC Kafka SQL/NoSQL

DevOps & SRE

CI/CD Monitoring Observability SLA/SLO/SLI Incident Response Performance Tuning

Showcase

Things I build

Lirvox — Livestream Platform

Personal Project · lirvox.liemlhd.com

Designed and built a livestream system from the ground up — covering the full lifecycle of building and managing streaming infrastructure at scale.

Highlights

Things I'm proud of

Founded SRE Practice at ZaloPay

VNG Corporation · 2019

Built the Site Reliability Engineering team from scratch within a 50+ engineer organization. Established monitoring, alerting, SLAs/SLOs, and error budget practices that transformed the engineering culture from risk-averse to innovation-driven.

Zero-Error Tet Peak for GPay

G-Group · 2023

Engineered GPay to handle Tet holiday traffic with transactions completing within 3 seconds and zero errors — compared to a 30% error rate and 10-second latency the previous year. A dramatic improvement during Vietnam's highest-traffic payment period.

Infrastructure Cost Optimization

G-Group · 2022–2024

Systematically reduced infrastructure spend from $18k to $12k/month at Gapo and cut GCP costs by 30% for GPay through architecture optimization, right-sizing, and reserved instances — without compromising performance or reliability.

MiniApp Platform — 50% Faster Onboarding

VNG Corporation · ZaloPay · 2021

Directed the MiniApp Platform team to halve merchant onboarding time-to-market, enabling ZaloPay to rapidly expand its merchant ecosystem and accelerate campaign launches.

Contact

Let's connect

Have a project or architecture challenge to discuss? Feel free to reach out.

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