Senior Software Development Engineer (C++)

Job Description : We are looking for a skilled Senior Software Engineer with strong expertise in C programming, Linux Kernel, networking protocols, VPN, and IPSec. The candidate will be responsible for designing, developing, enhancing, and troubleshooting high-performance networking and security products involving IPSec tunnels, packet processing, VPN technologies, and Linux-based systems.Key Responsibilities : - Design, develop, and maintain VPN and network security features using C/C++ on Linux platforms.- Develop and enhance IPSec VPN tunnels, including tunnel establishment, packet encapsulation/decapsulation, and secure packet transmission.- Work extensively with Linux Kernel networking and packet-processing components.- Develop and troubleshoot networking modules, services, and components for high-throughput and low-latency environments.- Analyze and debug IP packet flows, tunnel traffic, routing, and network connectivity issues.- Implement and troubleshoot IPSec protocols, including IKE, ESP, and AH.- Work with IKEv1/IKEv2 for secure VPN tunnel establishment and key negotiation.- Analyze packet captures using tools such as Wireshark/tcpdump to identify protocol and connectivity issues.- Develop kernel-level and user-space components for networking and security applications.- Troubleshoot issues related to TCP/IP, UDP, IP routing, NAT, DNS, ARP, ICMP, and other networking protocols.- Optimize packet-processing performance and memory/CPU utilization.- Debug complex issues using GDB, core dumps, kernel logs, and Linux debugging tools.- Collaborate with QA, product, and system teams to analyze defects and deliver production-quality networking features.- Participate in design reviews, code reviews, unit testing, integration testing, and performance testing.- Investigate customer-reported VPN/networking issues and provide root-cause analysis.- Develop tools and utilities to monitor and measure network throughput, latency, packet loss, and tunnel performance.Technical Skills : - Strong programming experience in C/C++.- Strong hands-on experience with Linux/Unix systems.- Good understanding of Linux Kernel and Linux networking stack.- Strong knowledge of VPN technologies, IPSec, IKE/IKEv1/IKEv2, ESP, AH.- Strong knowledge of TCP/IP networking protocols (IPv4/IPv6, ICMP, ARP, DHCP, DNS, NAT, Routing, GRE).- Strong debugging skills using GDB, tcpdump, Wireshark, strace, and Linux logs.Preferred Skills : - Strong understanding of StrongSwan or similar IPSec implementations.- Experience with DPDK or other high-performance packet-processing frameworks.- Knowledge of XFRM/IPSec implementation in Linux.- Experience with firewall/security products, SASE/SD-WAN/SSE technologies.- Knowledge of cryptographic libraries such as OpenSSL.Education & Experience : - Bachelor's/Master's degree in Computer Science, Information Technology, Electronics, Electrical Engineering, or a related field.- Typically 5 to 10+ years of experience in networking/security software development.- Relevant experience in VPN/IPSec/network security products preferred. (ref:hirist.tech)