---
title: 'Senior Software Engineer — Embedded C / Firewall Client at SonicWall'
canonical: 'https://feeny.ai/job/senior-software-engineer-embedded-c-firewall-client-sonicwall-bengaluru-wp5gx0nkjb2p'
type: 'job'
last_seen: '2026-09-07'
---

# Senior Software Engineer — Embedded C / Firewall Client at SonicWall

- **Company:** SonicWall
- **Location:** Bengaluru, India
- **Posted:** 2026-07-09
- **Last confirmed live:** 2026-09-07
- **Apply:** https://job-boards.greenhouse.io/sonicwall/jobs/8027663

## Job description

[SonicWall](https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fc212.net%2Fc%2Flink%2F%3Ft%3D0%26l%3Den%26o%3D4263951-1%26h%3D4126915226%26u%3Dhttps%253A%252F%252Fnam04.safelinks.protection.outlook.com%252F%253Furl%253Dhttps%25253A%25252F%25252Fwww.sonicwall.com%25252F%2526data%253D05%25257C01%25257Cbfitzgerald%252540SonicWall.com%25257Ca6c16b82afc749239f1c08dbda330d94%25257C84fe6f401cbc473083288018b2af88bc%25257C1%25257C0%25257C638343685070400977%25257CUnknown%25257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%25253D%25257C3000%25257C%25257C%25257C%2526sdata%253DQiWUyjNRdG%25252F5Rg2xvGXa1CYzr9V6BNnIgriz33Hk4vw%25253D%2526reserved%253D0%26a%3DSonicWall&data=05%7C02%7CNikhilaR%40SonicWall.com%7Cfd3ae83762384be031d508dcdf3d2ddf%7C84fe6f401cbc473083288018b2af88bc%7C1%7C0%7C638630701067920926%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=GhrhwS9jae1nk4KBGBzKfBcXS7BDBmkWDO87fbJLQxQ%3D&reserved=0) is a cybersecurity forerunner with more than 30 years of expertise and is recognized as a leading partner-first company, ensuring our partners and their customers are never alone in the fight against cybercrime. With the ability to build, scale and manage security across the cloud, hybrid and traditional environments in real-time, SonicWall provides relentless security against the most evasive cyberattacks across endless exposure points for increasingly remote, mobile and cloud-enabled users. With its own threat research center, SonicWall can quickly and economically provide purpose-built security solutions to enable any organization—enterprise, government agencies and SMBs—around the world. For more information, visit [www.sonicwall.com](https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fc212.net%2Fc%2Flink%2F%3Ft%3D0%26l%3Den%26o%3D4263951-1%26h%3D2643321098%26u%3Dhttps%253A%252F%252Fnam04.safelinks.protection.outlook.com%252F%253Furl%253Dhttp%25253A%25252F%25252Fwww.sonicwall.com%25252F%2526data%253D05%25257C01%25257Cbfitzgerald%252540SonicWall.com%25257Ca6c16b82afc749239f1c08dbda330d94%25257C84fe6f401cbc473083288018b2af88bc%25257C1%25257C0%25257C638343685070400977%25257CUnknown%25257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%25253D%25257C3000%25257C%25257C%25257C%2526sdata%253DXI%25252FDFdF08xnLTx4H7uCLIOH1N6kWKxObFvd9KJwK2Lc%25253D%2526reserved%253D0%26a%3Dwww.sonicwall.com&data=05%7C02%7CNikhilaR%40SonicWall.com%7Cfd3ae83762384be031d508dcdf3d2ddf%7C84fe6f401cbc473083288018b2af88bc%7C1%7C0%7C638630701067946534%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=4g9iPS3CN7E0hNoG8nisr9%2F%2B1iThtyJLQkZfTTFjk38%3D&reserved=0) or 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## About the Role

SonicWall is hiring a Senior Software Engineer to develop and maintain the Content Filtering Service client embedded in SonicOS — the firmware running on SonicWall firewall appliances worldwide. This module intercepts live traffic, queries the CFS rating servers in real time, and enforces URL-based content filtering policies at the packet level. This is security-critical code: a policy bug is a traffic bypass on a deployed security appliance.

The codebase is in C with a split Control Plane / Data Plane architecture, multi-blade cache synchronization, and multiple firmware version upgrade paths.

## Responsibilities

- Maintain, harden, and extend the CFS client module across both the control plane and data plane.
- Own the binary UDP protocol implementation between the firewall and the CFS rating servers, ensuring correctness and compatibility across protocol versions.
- Develop and maintain complete IPv4 and IPv6 support across all code paths.
- Own the firmware upgrade and migration paths, ensuring they are atomic, failure-safe, and correctly handle all supported version transitions.
- Improve reliability of inter-blade cache synchronization on multi-blade appliances.
- Collaborate with the server-side on coordinated protocol changes.
- Document the concurrency model, upgrade invariants, and dataplane integration for long-term maintainability.
- Collaborate asynchronously with a US-based team and the India-based server team.

## Requirements

- Expert-level C (not C++): disciplined manual memory management, pointer arithmetic, and systems design.
- Multi-core concurrency in C: reader-writer locks, spinlocks, atomic operations, and memory ordering.
- Kernel-level networking: deep understanding of how a packet moves through a firewall dataplane — TCP/UDP processing, flow cache, connection tracking. Userspace socket programming alone is not sufficient.
- Strong IPv4 and IPv6 across all code paths.
- Comfortable navigating and owning a large C codebase with multiple subsystems.
- Experience with network testing and debugging tools: packet capture (Wireshark/tcpdump), traffic generators, GDB.
- Good written English for remote, asynchronous collaboration.

Nice to have:

- Experience with multi-blade or multi-ASIC hardware platforms (Octeon/CVMX or similar).
- Understanding of symmetric encryption (AES-CBC, DES) at the C implementation level.
- Prior experience on a security appliance, network device, or UTM firmware codebase.
- Familiarity with TLV binary protocol design and versioning.
- Experience with C fuzz testing or sanitizers (AFL, AddressSanitizer, ThreadSanitizer).

Education & Experience

At least 8 years of related experience with a Bachelor's degree; or 6 years with a Master's degree; or a PhD with 3 years' experience; or equivalent experience preferred. Degree in Computer Science, Engineering, or related field preferred.

## #LI-KB7

#LI-Hybrid

#C

#Firewall

#Networking SonicWall is an equal opportunity employer.

We are committed to creating a diverse environment and are an equal opportunity employer. All qualified applicants receive consideration for employment without regard to race, color, ethnicity, religion, sex, gender, gender identity and expression, sexual orientation, national origin, disability, age, marital status, veteran status, pregnancy, or any other basis prohibited by applicable law.

At SonicWall, we pride ourselves on recruiting a diverse mix of talented people and providing active security solutions in 100+ countries.

[Applicant Privacy Notice](https://www.sonicwall.com/legal/job-applicant-privacy-notice/)

## About SonicWall

## Company Overview
- **One-liner**: SonicWall delivers advanced, cost‑effective cybersecurity solutions for organizations of all sizes, powered by real‑time threat intelligence and a partner‑first platform.
- **Entity Type**: Private (owned by Francisco Partners; no public ticker)
- **Headquarters**: Milpitas, California, USA
- **Founded**: 1991
- **Founders**: Not publicly listed (company was originally founded as SonicWALL, Inc.)

## Core Business
- **Primary industries**: Computer and Network Security, Cybersecurity
- **Target customers**: SMBs, mid‑market enterprises, government agencies, channel partners (10,000+ global partners)
- **Mission**: To design and develop advanced, cost‑effective cybersecurity solutions built on superior threat intelligence that evolves with partners’ and customers’ needs.
- **Purpose**: To protect and empower the well‑being of organizations online.

## Products & Services
- **Next‑Generation Firewalls (NGFW)**: Hardware and virtual firewalls with integrated threat prevention, intrusion detection, and application control.
- **Cloud Secure Edge (CSE) / ZTNA**: Zero‑trust network access solutions for secure remote access.
- **Endpoint Protection**: Anti‑virus, anti‑malware, and advanced threat protection for endpoints.
- **SonicWall Unified Management**: Multi‑tenant architecture for centralized policy and device management.
- **Managed Protection Bundle**: Subscription service backed by SonicWall’s threat research and 24/7 SOC.
- **SAMI (SonicWall AI)**: Embedded AI to simplify operations, resolve issues faster, and reduce noise.
- **Global Response Intelligent Defense (GRID) Threat Network**: Real‑time threat intelligence network powering all products.

## Market Standing
- **Valuation**: Not disclosed (private company)
- **Annual Revenue**: Approximately $480 M (estimated; source: LinkedIn)
- **Total Funding**: Not applicable (private, owned by Francisco Partners; previously acquired by Dell and later taken private)
- **Notable Investors/Partners**: Francisco Partners (parent company); 10,000+ channel partners; 1.1 million security sensors deployed in 215 countries
- **Growth Signals**: 
  - Active job postings surged +92.7% monthly and +172.4% quarterly (LinkedIn data)
  - Recent introduction of SAMI AI and new Managed Protection bundle
  - Expanding Cloud Secure Edge (ZTNA) offerings
  - Headcount of ~1,241 (LinkedIn) to ~1,832 (Built In) – conflicting reports; both cited below

## Competitive Advantages
- **Partner‑first ecosystem**: Strong channel partner network (10,000+) gives broad reach and loyalty.
- **30+ years of cybersecurity expertise**: Deep domain knowledge and a dedicated threat research center (GRID).
- **Real‑time, multi‑vector protection**: Covers network, cloud, endpoint, and remote access in a unified platform.
- **Cost‑effective for SMBs**: Positioned as affordable yet enterprise‑grade security.
- **Embedded AI (SAMI)**: Differentiates by simplifying operations and reducing alert fatigue.

## Strategic Focus
- **AI‑driven automation**: Expanding SAMI to automate threat response and streamline management.
- **Cloud‑first security**: Growing Cloud Secure Edge (ZTNA) and managed services for hybrid/remote work.
- **Partner enablement**: Strengthening tools and programs for channel partners.
- **Global expansion**: Operating in 46 countries; hiring aggressively in India, US, Canada, and Europe.

## Why Work Here
- **Culture**: Collaborative, innovative, and fun environment with a “never alone” philosophy. Employee Resource Groups (ERGs) foster inclusion and belonging.
- **Remote/Hybrid Policy**: Mix of remote, in‑office, and hybrid roles; many positions are fully remote (US, Canada, Europe, India).
- **Wellness & Benefits**: Mental and physical wellness programs, paid time off, ample holidays, work‑life balance, and competitive compensation.
- **Recognition**: Awards tied to core values; outstanding performance is celebrated.
- **Engineering Culture**: Heavy focus on networking, security, and AI; teams in Pune, Bengaluru, and US offices. Strong learning and development opportunities.
- **Social Responsibility**: Community engagement, fundraising for nonprofits, and partnerships to access untapped talent pools.

## Sources
1. [SonicWall Careers](https://www.sonicwall.com/careers)
2. [SonicWall Website](https://www.sonicwall.com/)
3. [SonicWall Jobs on Greenhouse](https://job-boards.greenhouse.io/sonicwall)
4. [LinkedIn Company Page](https://www.linkedin.com/company/sonicwall)
5. [Built In SonicWall Profile](https://builtin.com/company/sonicwall)

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