What you will do

• Handle backend Database for Zalo;
• Working cross-team in implemented projects or collecting requirements for further development;
• Involve in technologies evaluation and selection if needed to implement new solutions;
• Participate in the design, development and implementation of new features and various supporting tools as required;
• Learn more about tech stacks, programming languages, internal DBs & frameworks;
• Research new technologies and learn to develop high-load, low-latency services and deliver high availability and performance. 

What you will need

• Experience in software development C/C++, Java, Go;
• Strong in algorithm and data structure;
• Familiar with in-memory and NoSQL databases, hands-on experience is preferred;
• Experienced with asynchronous programming and multi-threading is a plus;
• Good knowledge in Linux (scripting, configurations, tuning/ optimization);
• Familiar with network protocols (TCP, UDP, HTTP) and socket programming is a plus;
• Be willing to learn new technologies and programming languages.

What you will do

• Read and review code to learn how to build a huge CDN system and WAF for many products of Zalo Group;
• Participate in the design, development, and implementation of new features or operational tasks;
• Research and learn to develop high-volume, low-latency applications, and deliver high availability and performance through proxy server, load balancer (L7 - L3), HTTP cache;
• Research new technologies such as HTTP/3 - QUIC.

What you will need

• Experience in Java, Golang or C++;
• Excellent in Data Structures and Algorithms, OOP;
• Have a good knowledge about popular network protocols (HTTP, DNS, TCP/IP, UDP,
  etc);
• Familiar with high performance programming (multithread, nonblocking I/O, caching
  mechanism, etc);
• Good at problem-solving skills under high pressure;
• Be willing to learn new technologies;
• Experienced in Linux operating system, SQL and NoSQL are a plus.

Nice to have:

• Experience with CI/CD pipeline, such as Jenkins/Gitlab/Harbor/etc;
• Experience with RPC frameworks (gRPC, fbthrift, ...) and microservices architecture;
• Experience with source version control (git, svn...), as well as configuration management (ansible, puppet, salt stack...).