Senior Software Engineer (C++/Java)

Zalo • Messaging Apps • Social Networks • Java • C++ • 1 day ago

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Salary

≈ $14k – $39k per year (Estimated)

Location

In office (Ho Chi Minh City)

Seniority

Senior · 3+ years exp

Confirmed on the employer's own hiring board on Oct 16, 2026. First seen by Alion on Oct 15, 2026. Zalo scores A on the Alion truth index.

Overview

Company

Impact

Profile match

Zalo

Zalo is a Vietnamese messaging and internet platform based in Ho Chi Minh City, part of the VNG Corporation group, whose app is used by more than 80 million people in Vietnam for chat, calls, official accounts, payments and mini apps. Launched in 2012 by founder Vuong Quang Khai, the Zalo group also runs the Zing MP3 music service, Zalo Video, the Kiki Auto voice assistant, Zalo AI language models, the Adtima advertising unit and Zalo Business Solutions cloud products. It hires product specialists and owners, data engineers and analysts, AI researchers, system engineers, ads policy and content moderation staff and customer service personnel.

zalo.me • HQ: Ho Chi Minh City, Vietnam • Social Networks • Messaging Apps • 1001-5000 employees • Est. 2012

Tech stack of Zalo

What you will do

Manage and operate database for Zalo chat message system, focusing on high throughtput, resilience.
Maintain and optimize source code database. Upgrade legacy code/lib C++ to newer version.
Manage and monitor server backend (disk/network/load). Build tool/alert system to help managing server backend.
Analyze / Detect bottleneck in database to improve performance, throughput.
Design database cluster for new feature of Zalo chat message system.
Build tool to help maintain/manage microservice system.

What you need

3+ years experience in backend systems.
Experience in linux operating system, async i/o, event driven design.
Experience with NoSQL database, understand disk I/O, network effect on database.
Knowledge in distributed, microservice system, RPC (gRPC/Thrift), message queue (kafka/...)
Should have fluency in C++/Java.

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