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Backend Developer

Backend Developer

gusri solutions

0 - 1 years

0 Lacs

noida uttar pradesh

Posted:3 days ago| Platform: Indeed logo

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Skills Required

developer firewall network security programming processing design development filtering dpi networking model tcp ip udp http multithreading tracking inspection icmp ftp openssl support https interface monitoring code latency concurrency linux routing iptables management qt wpf rest parsing flow encryption analysis wireshark tcpdump unix configuration ngfw vrrp service siem integration

Work Mode

On-site

Job Type

Full Time

Job Description

About the Role

We are looking for a C++ Firewall & Network Security Developer with deep expertise in network protocol stacks, C++ systems programming, and real-time packet processing. In this role, you will work on the design and development of high-performance firewall components, including packet filtering, DPI, policy enforcement, and network traffic analysis.The ideal candidate has a strong foundation in networking (OSI Model, TCP/IP, UDP, HTTP/S, DNS, SSL/TLS), and has experience implementing and optimizing networked systems with multithreading, sockets, and security protocols.

Key Responsibilities

Design and implement modules for a next-generation firewall using C++17/20 with focus on network-layer filtering, connection tracking, and application-level control.
Build high-performance network packet processing pipelines using raw sockets or libraries like libpcap.
Implement Deep Packet Inspection (DPI) and application detection using known libraries (e.g., nDPI) or custom engines.
Develop and maintain components that work with network protocols like TCP, UDP, ICMP, HTTP/S, DNS, FTP, and TLS.
Integrate OpenSSL to support TLS inspection and secure control channels (e.g., HTTPS APIs, secure sync).
Build or interface with rule engines for access control, rate limiting, and traffic shaping.
Support development of alerting systems, log collectors, and network health monitoring tools.
Optimize code for latency and throughput, using concurrency control, SIMD, and lock-free techniques.
Work with multi-interface systems, Linux/Windows networking stacks, and handle routing/firewall table updates (e.g., iptables, pf, iproute2).
Collaborate with GUI teams for management interfaces built using QT/QML or WPF, and expose APIs using REST or gRPC.

Required Skills & Experience

6+ years of experience in modern C++ (C++11/14/17/20), OOP, and STL.
Strong foundation in networking protocols and OSI model (L2-L7).
Hands-on experience with TCP/IP socket programming, packet parsing, and flow/session tracking.
In-depth knowledge of TLS/SSL, encryption techniques (RSA, AES), and OpenSSL APIs.
Experience with multithreading, concurrency primitives, and performance optimization.
Familiarity with network protocol analysis tools (e.g., Wireshark, tcpdump) and debugging.
Proficiency in Linux/Unix internals, network configuration, and system diagnostics.

Nice to Have (Preferred)

Experience with firewalls, NGFW, intrusion detection, or network sniffers.
Exposure to libpcap, nDPI, Netfilter/iptables, pfctl, or eBPF.
Experience with high availability (HA), VRRP/CARP, or clustered deployments.
Familiarity with Protobuf, gRPC, REST APIs, and secure service design.
Background in security appliances, VPNs, or Windows Credential Providers.
Comfortable with log rotation, SIEM integration, and custom monitoring hooks.

Job Type: Full-time

Pay: Up to ₹1,500,000.00 per year

Application Question(s):

What is your CTC?
What is your Expected CTC?

Experience:

C++: 1 year (Preferred)
C Language: 1 year (Preferred)
Back-end development: 1 year (Preferred)

Location:

Noida, Uttar Pradesh (Preferred)

Work Location: In person

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Backend Developer