Software Engineer, C/C++ – France

Hornetsecurity GmbH · Not specified

Posted on 3 November 2026

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Software Engineer, C/C++ – France

Department: Security Lab

Location: Hem, France

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Job description details

Intro

Email remains the backbone of global communication and one of the most targeted vectors for cyberattacks. With the rapid advancement of LLMs and AI agents, sophisticated, AI-driven attacks have become an increasingly critical threat to businesses.

We are looking for a Software Engineer to join our Filtering Technologies team within the Security Lab and help us shape the next generation of cybersecurity products. The Security Lab is an international team (Europe, North America, Japan) of engineers and security analysts that builds and operates the technologies that protect over 75,000 businesses worldwide.

You will contribute to the evolution of two core technologies:

Hornet email filter: Our proprietary high-performance email filter protects 1.4 billion mailboxes worldwide against malicious emails. The email filter is at the heart of Hornet ATP (Advanced Threat Protection), protecting business customers against phishing, Business Email Compromise (BEC), spear phishing, and ransomware. It is also used by large telecom operators and OEM customers. The email filter is updated 24/7 by our Global Threat Center (SOC team).

GNI (Global Network Intelligence): Our large-scale data platform ingests billions of data points every day from our cybersecurity technologies (including the Hornet email filter instances), enriches and correlates them, computes detections/risk, and produces decisions and automated actions.

You will work primarily in C/C++, Go, and Python. While the knowledge of C/C++ is mandatory for the position, the knowledge of Go and Python is optional. If you are not proficient in Go and Python, you will be given the opportunity to learn these programming languages.

Your Job

Building and evolving the Hornet email filter, its surrounding ecosystem and the GNI platform

Industrializing unit, functional, security, and performance tests through CI/CD pipelines

Containerizing applications and preparing them for production deployment in collaboration with the DevOps team

Participating in teamwork and code reviews

Collaborating with cross-functional teams (Product, IT, DevOps) and other Security Lab teams

Your Profile

Must-have:

Strong proficiency in C/C++ is mandatory

Minimum 3 years of software development experience

Knowledge of Git and Linux

Strong problem-solving skills and an autonomous, rigorous, and well-organized approach to work

Willingness to learn

Ability to work effectively in an international team, with professional proficiency in written and spoken English

A genuine eagerness to adapt, especially in the rapidly evolving landscape of AI and LLMs

Nice-to-have:

Knowledge of Go

Knowledge of Python

Hands-on experience with AI-assisted development tools (such as Cursor, Codex, Claude Code, etc.)

Strong interest in scalability, high-throughput systems, and performance engineering

Strong interest in cybersecurity

Knowledge of SMTP

Your Benefits

Flexible hybrid work arrangement

Meal vouchers: €10 per voucher (including €5.92 contribution from Hornetsecurity)

100% coverage of public transportation costs

Health insurance & supplementary pension plan (Axa)

Sports and wellness benefits (subsidy provided)

International exchange program

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Julia Klein (Team Lead Recruiting) and our Recruiting Team are excited to get to know you!

Simply apply proactively and convince us of your abilities!

You can send your application to [email protected]. If you have any further questions, please do not hesitate to write us via WhatsApp on .

About Hornetsecurity

Hornetsecurity is a leading global provider of next-generation cloud-based security, compliance, backup, and security awareness solutions that help companies and organisations of all sizes around the world. Its flagship product, 365 Total Protection, is the most comprehensive cloud security solution for Microsoft 365 on the market. Driven by innovation and cybersecurity excellence, Hornetsecurity is building a safer digital future and sustainable security cultures with its award-winning portfolio. Hornetsecurity operates in more than 120 countries through its international distribution network of 12,000+ channel partners and MSPs. Its premium services are used by more than 125,000 customers.

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Original posting: www.hornetsecurity.com

Apply on the original site (opens in a new tab)Open in FullTime with Benefits