Senior Network Security Software Engineer

Persistent Systems; Pune District; Hybrid; INR 1,200,000 - 1,800,000; Full time

Job summary

Persistent Systems in Pune is seeking a Senior Network Security Software Engineer with 8+ years of C/C++ experience to design and build next-generation firewall solutions on Linux/embedded platforms. You will work on high-performance packet processing, security features, and scalable architectures.

The role emphasizes leadership, collaboration across teams, and delivering secure, reliable networking software with DPI, IPS, TLS/IPSec, and PKI integrations.

Qualifications

• 8+ years of C/C++ systems programming on Linux or embedded platforms.
• Strong knowledge of TCP/IP, routing, switching, SSL/TLS, and IPSec.
• Experience in data-plane development and packet processing optimization.
• Deep knowledge of Linux internals, multithreading, concurrency, and high-performance app development.
• Experience developing CLI tools, APIs, telemetry solutions, logging frameworks, and SSH-based interfaces.
• Strong understanding of security architecture, authentication mechanisms, PKI, and certificate management.
• Hands-on with Firewall/NGFW, DPI, IPS, malware protection, and web filtering technologies.
• Excellent debugging, troubleshooting, and performance tuning skills.
• Proven ability to design scalable systems and provide technical leadership.

Responsibilities

• Design and develop control-plane and data-plane components for NGFW platforms across Layers 3‑7.
• Build high-performance packet processing and traffic management systems on multi-core architectures (DPDK/ODP).
• Develop management interfaces including CLI, APIs, SSH access, logging, diagnostics, and telemetry frameworks.
• Implement security technologies including SSL/TLS, IPSec, SAML, PKI, and certificate lifecycle management.
• Develop cybersecurity features such as DPI, IPS, malware protection, URL filtering, and content categorization.
• Architect scalable, secure, and highly available solutions with clustering, HA, licensing, and secure coding practices.
• Optimize system performance and troubleshoot networking/security issues using GDB, Wireshark, and Valgrind.
• Collaborate with cross-functional engineering teams on architecture, product enhancements, and remediation.

Skills

C/C++ programming

Linux/embedded

Networking protocols

Data-plane development

DPDK/ODP

Security architectures

Multithreading/concurrency

TLS/IPSec/SAML

Debugging/perf tuning

Leadership/mentoring

Tools

GDB

Wireshark

Valgrind

SSH tooling

Embedded/Linux tooling

Job description

We are seeking a highly experienced Senior Firewall/Network Security Software Engineer with 8+ years of expertise in C/C++ development for Linux and embedded systems. The role focuses on designing and developing next-generation firewall (NGFW) and cybersecurity solutions, including high-performance packet processing, network security, authentication systems, and advanced threat protection. The ideal candidate will have deep knowledge of networking protocols, security architectures, and scalable system design.

• Role: Senior Network Security Software Engineer
• Location: Pune
• Experience: Between 8 to 15 Years
• Job Type: Full Time Employment

What You’ll Do:

• Design and develop control-plane and data-plane components for next-generation Firewall (NGFW) platforms across Layers 37.
• Build high-performance packet processing and traffic management systems using multi-core architectures such as DPDK and ODP.
• Develop and maintain management interfaces including CLI, APIs, SSH access, logging, diagnostics, and telemetry frameworks.
• Implement and enhance security technologies including SSL/TLS, IPSec, SAML, PKI, and certificate lifecycle management.
• Develop cybersecurity features such as Deep Packet Inspection (DPI), Intrusion Prevention Systems (IPS), malware protection, URL filtering, and content categorization.
• Architect scalable, secure, and highly available solutions with clustering, HA, licensing, and secure coding best practices.
• Optimize system performance and troubleshoot complex networking and security issues using tools such as GDB, Wireshark, and Valgrind.
• Collaborate with cross-functional engineering teams on architecture, security, product enhancements, and vulnerability remediation.

Expertise You’ll Bring:

• 8+ years of hands‑on experience in C/C++ systems programming on Linux or embedded platforms.
• Strong understanding of networking protocols across L3-L7, including TCP/IP, routing, switching, SSL/TLS, and IPSec.
• Extensive experience in data-plane development and packet processing optimization.
• Deep knowledge of Linux internals, multithreading, concurrency, and high-performance application development.
• Experience developing CLI tools, APIs, telemetry solutions, logging frameworks, and SSH-based management interfaces.
• Strong understanding of security architecture, authentication mechanisms, PKI, and certificate management.
• Hands‑on experience with Firewall, NGFW, DPI, IPS, malware protection, and web/content filtering technologies.
• Excellent debugging, troubleshooting, and performance tuning skills.
• Proven ability to design scalable systems and provide technical leadership.
• Expert-level C/C++ programming and systems development expertise.
• Deep understanding of cybersecurity and firewall technologies.
• Strong experience with packet processing frameworks such as DPDK/ODP.
• Advanced knowledge of Linux and embedded operating systems.
• Expertise in network security protocols, authentication, and encryption technologies.
• Ability to architect secure, scalable, and highly available networking solutions.
• Strong analytical and problem‑solving capabilities in complex real‑time environments.
• Leadership skills with the ability to mentor engineers and drive technical discussions.
• Competitive salary and benefits package
• Culture focused on talent development with quarterly growth opportunities and company-sponsored higher education and certifications
• Opportunity to work with cutting‑edge technologies
• Employee engagement initiatives such as project parties, flexible work hours, and Long Service awards
• Insurance coverage: group term life, personal accident, and Mediclaim hospitalization for self, spouse, two children, and parents

Values-Driven, People-Centric & Inclusive Work Environment:

Persistent is dedicated to fostering diversity and inclusion in the workplace. We invite applications from all qualified individuals, including those with disabilities, and regardless of gender or gender preference. We welcome diverse candidates from all backgrounds.

• We support hybrid work and flexible hours to fit diverse lifestyles.
• Our office is accessibility-friendly, with ergonomic setups and assistive technologies to support employees with physical disabilities.
• If you are a person with disabilities and have specific requirements, please inform us during the application process or at any time during your employment.

Persistent is an Equal Opportunity Employer and prohibits discrimination and harassment of any kind.