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Senior Software Engineer - Go (Next-Gen Firewall)

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Qualgo

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Location:
Vietnam , Ho Chi Minh City

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

Not provided
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Job Description:

We are seeking a Senior Backend Engineer (Go) to join our core engineering team building a Next-Generation Firewall (NGFW) powered by Artificial Intelligence. In this role, you will architect and develop the high-performance control plane and data processing engines that protect enterprise networks from sophisticated cyber threats. You will not just build APIs; you will bridge the gap between low-level network traffic analysis and high-level threat intelligence. You will integrate industry-standard engines like Suricata, Squid, and OPNsense into a unified, AI-driven security platform. You will work on complex technical challenges involving zero-trust architecture, real-time packet inspection, and massive-scale threat data pipelines.

Job Responsibility:

  • Design and implement high-performance Go services that interact with network subsystems (netfilter/nftables) and open-source security engines (Suricata, Squid, Zeek)
  • Design and implement routing functionalities on low resource gateway system
  • Develop custom plugins or sidecars to ingest, parse, and normalize IDS/IPS alerts (Suricata EVE logs) and Proxy logs for the AI engine
  • Build the "Action Engine" that translates AI threat verdicts into real-time blocking rules (firewall policies, BGP blackholing, or DNS sinkholing)
  • Deeply integrate with OPNsense APIs/plugins to orchestrate policy updates across distributed firewall nodes
  • Architect scalable gRPC and REST APIs to serve as the control plane for thousands of firewall agents
  • Write highly optimized, concurrent Go code to handle high-throughput log ingestion with minimal latency/GC overhead
  • Design distributed locking and consistency mechanisms to ensure firewall policies are synchronized globally across multi-tenant environments
  • Build low-latency pipelines using Kafka or NATS JetStream to stream network telemetry to our AI/ML inference engine
  • Implement WebSocket or HTTP/2 streaming for real-time threat visualization and alerting dashboards
  • Collaborate with Data Scientists to ensure network data (PCAP, flow logs) is efficiently structured for anomaly detection models
  • Optimize system performance for high packet-per-second (PPS) processing and low-latency throughput
  • Debug complex networking issues (TCP handshake failures, MTU issues, asymmetric routing) using tools like tcpdump, Wireshark, and eBPF
  • Implement rigorous telemetry (Prometheus/Grafana) to monitor the health of distributed firewall nodes
  • Provide technical guidance on Go best practices, concurrency patterns, and secure coding standards
  • Work closely with the Security Research team to understand new attack vectors and implement detection logic

Requirements:

  • Bachelor's or Master’s degree in Computer Science, Cybersecurity, Network Engineering, or related field
  • Deep understanding of goroutines, channels, memory management, and profiling (pprof)
  • Strong grasp of the OSI model, TCP/IP, DNS, TLS/SSL, VPNs (WireGuard/IPsec), and Routing
  • Experience with Docker, Kubernetes, and deploying network appliances on AWS/GCP/Azure
  • Production experience with Kafka, RabbitMQ, or NATS
  • Good English skills (speaking and listening) to communicate with the global teams
  • Hands-on experience with Suricata, Snort, Zeek, or Squid Proxy
  • Familiarity with OPNsense or pfSense architecture is a huge plus

Nice to have:

  • Experience with eBPF (Cilium/Ebpf-go) for high-performance packet filtering
  • Knowledge of DPDK or XDP for kernel-bypass networking
  • Understanding of B2B SaaS multi-tenancy requirements
  • Experience implementing Zero Trust Network Access (ZTNA) concepts
What we offer:
  • Meaningful work & impact
  • Competitive rewards
  • Growth & well-being
  • People & workspace
  • Young & dynamic environment

Additional Information:

Job Posted:
January 10, 2026

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