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Location
In office (Ho Chi Minh City)
Seniority
Junior · 2+ years exp

Confirmed on the employer's own hiring board on Nov 5, 2026. First seen by Alion on Nov 4, 2026. Zalo scores B on the Alion truth index.

Overview
Company
Impact
Profile match
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.

What you will do

  • Design, develop, test, and maintain backend services and RESTful APIs using Java to support applications serving millions of daily active users.
  • Build scalable, reliable, and maintainable backend services to support high-traffic applications with high throughput and low latency requirements.
  • Design and optimize database queries, data models, and caching strategies using SQL, NoSQL to improve system performance.
  • Monitor system performance, identify bottlenecks, troubleshoot production issues, and improve service stability and availability.
  • Work with microservices, RPC frameworks, message queues, and distributed caching systems to build reliable and efficient backend services.
  • Write clean, maintainable, and well-tested code. Participate in code reviews and follow engineering best practices.
  • Work with Linux-based environments, monitoring tools, and deployment pipelines to support development, deployment, and operation of backend services.
  • Collaborate with Product Owner, Frontend/Mobile Engineers, and other teams to deliver features that meet business and technical requirements.

What you need

Qualifications

  • Bachelor's degree in Computer Science, Software Engineering, Information Technology, or a related field, or equivalent practical experience.
  • At least 2 years of professional experience in backend software development.

Technical Skills

  • Good proficiency in Java, object-oriented programming, common design patterns, exception handling, collections, and Java concurrency fundamentals.
  • Solid understanding of common data structures, algorithms, time and space complexity, and problem-solving techniques.
  • Hands-on experience with SQL databases such as MySQL or PostgreSQL. Understanding of indexing, transactions, query optimization, and database design.
  • Experience with Redis or other caching systems. Basic understanding of NoSQL databases and their use cases.
  • Experience developing RESTful APIs and understanding HTTP, TCP/IP, authentication, and common networking concepts.
  • Understanding of microservices, service-to-service communication, distributed systems, and basic system design principles.

Nice to Have

  • Experience working with high-traffic systems serving millions of daily active users.
  • Familiarity with RPC frameworks such as gRPC or Thrift.
  • Experience with message brokers such as Kafka or RabbitMQ.
  • Understanding of Docker, CI/CD pipelines, and monitoring tools.
  • Experience analyzing application performance, memory usage, thread contention, and database bottlenecks.
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