Quoc Trung L.

I build backend systems that stay fast and reliable under real load. For 12+ years I’ve designed and run telecom-grade software at Viettel, including 5G Core network functions (NRF, NSSF, NSACF) and an EMS platform managing 20M+ subscribers. What I can help you with: • High-performance backend services and APIs in Go, Rust, Java or Erlang • Distributed and P2P systems: libp2p, Lightning Network, WebRTC, Substrate blockchain • Cloud-native DevOps: Kubernetes, Docker, GitLab CI/CD, monitoring and centralized logging (EFK, Prometheus, Grafana) • Databases: PostgreSQL, MySQL, YugabyteDB, Aerospike, MongoDB • Technical leadership: architecture, project planning, code review, and mentoring engineers As a former department head and project manager, I’ve led teams from planning to production. I communicate clearly, write solid documentation, and take ownership of delivery end to end. Based in Vietnam (UTC+7), flexible with overlap hours. Let’s talk about what you’re building.