We are building one of Vietnam's most widely used OTT communication platforms, serving nearly 80 million users and processing billions of messages every day. Our system is powered by a large-scale microservices architecture, where reliability, scalability, and performance are non-negotiable. We are looking for a Senior Software Engineer who is not only technically strong but also capable of owning complex systems end-to-end - from design to production - and driving impactful improvements at scale.
What you will do
- Own backend development for Chat features and related conversation experiences;
- Design, develop, and operate scalable services in a high-throughput, low-latency environment;
- Build and maintain messaging APIs used across internal teams and services;
- Work closely with Product Owners and QC to clarify requirements, propose technical solutions, and risk mitigation;
- Ensure high system reliability, performance, and delivery timelines;
- Follow SDLC processes and actively lead debugging, monitoring, and issue tracing;
- Continuously improve system architecture, performance, and observability.
What you will need
- Proven experience with large-scale distributed systems or high-performance platforms;
- Strong understanding of concurrency, asynchronous processing, and parallel systems;
- Proficiency in one or more backend languages: Java, Go, or C/C++;
- Deep knowledge of database systems (SQL and NoSQL);
- Strong understanding of RESTful API design.
- Strong understanding of caching strategies and performance optimization;
- Experience designing scalable systems with advanced data structures;
- Familiarity with networking fundamentals and protocols (HTTP, TCP/IP, UDP, DNS);
- Ability to translate product requirements into clear technical designs and documentation;
- Solid understanding of modern software design principles.
Nice to have
- Experience with modern Java (Java 21+);
- Familiarity with containerization (Docker, Kubernetes);
- Experience with gRPC or Thrift;
- Ability to leverage AI tools effectively in development workflows;
- Awareness of security best practices (OWASP Top 10);
