Senior Software Engineer (C, Linux)

Product Development – Software Engineering /
Permanent /
About Us
Sophos is a worldwide leader and innovator of advanced cybersecurity solutions, including Managed Detection and Response (MDR) and incident response services and a broad portfolio of endpoint, network, email, and cloud security technologies that help organizations defeat cyberattacks. As one of the largest pure-play cybersecurity providers, Sophos defends more than 500,000 organizations and more than 100 million users globally from active adversaries, ransomware, phishing, malware, and more. Sophos’ services and products connect through its cloud-based Sophos Central management console and are powered by Sophos X-Ops, the company’s cross-domain threat intelligence unit. Sophos X-Ops intelligence optimizes the entire Sophos Adaptive Cybersecurity Ecosystem, which includes a centralized data lake that leverages a rich set of open APIs available to customers, partners, developers, and other cybersecurity and information technology vendors. Sophos provides cybersecurity-as-a-service to organizations needing fully managed, turnkey security solutions. Customers can also manage their cybersecurity directly with Sophos’ security operations platform or use a hybrid approach by supplementing their in-house teams with Sophos’ services, including threat hunting and remediation. Sophos sells through reseller partners and managed service providers (MSPs) worldwide. Sophos is headquartered in Oxford, U.K. More information is available at 

 We are looking for software engineers with backgrounds in network security to join our Network Security Group Xstream Firewall Hardware/Cloud Platform Team.  Put your programming and security background skills to use in building world class performant and effective firewall products.

What You Will Do

    • Design and develop products or systems in line with asset technical strategy, specified project ,
    • Timescales, quality and functionality requirements as agreed with the Product management.
    • Define and support appropriate Unit, System and Integration testing on own code and others across the product or system, fixing errors and entering defects into the defect tracking system, highlighting potential implications on other products or systems.
    • Conduct and participate in peer reviews of code, designs and specifications as requested by Development Lead or Manager.
    • Coordinate with cross functional teams including software developers, testers, and product managers.
    • Adhere to coding best practices and standards, policies and processes set for project.
    • Prioritize multiple activities and schedule your own time to deliver against agreed objectives.
    • Review requirements specifications for coverage, identify areas that require further clarification, and suggest alternative approaches to Product Management, in line with business needs.
    • Propose, promote, and drive the adoption of new design and development approaches to improve overall quality, reliability, and speed of implementation across projects or own team.
    • Mentor more junior members of the team through pair programming and code reviews.

What You Will Bring

    • Very strong C programming skills a must
    • Team Player with can do attitude/initiative.
    • Passion for software engineering and coding with proven ability to test/debug own code
    • Experience with Agile Software Development methodologies
    • Ability to work well with team of senior and junior engineers in a dynamic, fast paced environment
    • Background and understanding of firewalls, proxy, IPS/IDS, web content filtering, AV scanning
    • Knowledge of Linux system-level programming and operating system internals
    • Experience in Linux multi-process and multi-threaded user space and/or kernel programming on x86
    • Knowledge of layer 2/3/4 networking protocols, concepts. Proven experience debugging networking issues.
    • Working experience on data plane forwarding a plus.
    • Detailed knowledge of TCP protocol a strong advantage
    • Ability to make appropriate design choices to maximize performance and scalability system requirements
    • Automation of test code. Scripting skills with Bash, Python, and/or Java

Nice to Have

    • Linux user space packet delivery technologies, DPDK, netmap, xdp, etc
    • Internals of Linux Kernel core networking stack, Netfilter, and/or netdev drivers
    • Snort and/or other IPS/IDS packet processing technologies
    • TLS, IPSec and cryptography knowledge
    • Kubernetes
    • Docker
In Canada, the base salary for this role ranges from $110,000 to $183,000. In addition to base salary, we offer additional compensation including bonus eligibility and a comprehensive benefits package.  A candidate’s specific pay within this range will depend on a variety of factors, including job-related skills, training, location, experience, relevant education, certifications, and other business and organizational needs. 


Ready to Join Us?
At Sophos, we believe in the power of diverse perspectives to fuel innovation. Research shows that candidates sometimes hesitate to apply if they don't check every box in a job description. We challenge that notion. Your unique experiences and skills might be exactly what we need to enhance our team. Don't let a checklist hold you back – we encourage you to apply.

What's Great About Sophos?
·   Sophos operates a remote-first working model, making remote work the primary option for most employees. However, some roles may necessitate a hybrid approach. Please refer to the location details in our job postings for further information.
·   Our people – we innovate and create, all of which are accompanied by a great sense of fun and team spirit
·   Employee-led diversity and inclusion networks that build community and provide education and advocacy
·   Annual charity and fundraising initiatives and volunteer days for employees to support local communities
·   Global employee sustainability initiatives to reduce our environmental footprint
·   Global fitness and trivia competitions to keep our bodies and minds sharp
·   Global wellbeing days for employees to relax and recharge 
·   Monthly wellbeing webinars and training to support employee health and wellbeing

Our Commitment To You
We’re proud of the diverse and inclusive environment we have at Sophos, and we’re committed to ensuring equality of opportunity.   We believe that diversity, combined with excellence, builds a better Sophos, so we encourage applicants who can contribute to the diversity of our team.  All applicants will be treated in a fair and equal manner and in accordance with the law regardless of gender, sex, gender reassignment, marital status, race, religion or belief, color, age, military veteran status, disability, pregnancy, maternity or sexual orientation.  We want to give you every opportunity to show us your best self, so if there are any adjustments we could make to the recruitment and selection process to support you, please let us know. 

Data Protection
If you choose to explore an opportunity, and subsequently share your CV or other personal details with Sophos, these details will be held by Sophos for 12 months in accordance with our Privacy Policy and used by our recruitment team to contact you regarding this or other relevant opportunities at Sophos.  If you would like Sophos to delete or update your details at any time, please follow the steps set out in the Privacy Policy describing your individual rights.  If you have any questions about Sophos’ data protection practices, please contact