Bitdefender

Malware protection software via machine learning

Security Researcher

Offensive Security & TestingPosted on Nov 11

Full-timeCluj-Napoca, RomaniaNo salary listedIn-person

About the Job

Requirements

At least 3 years of experience in network security, offensive security, or research.
Very good knowledge of network attacks and packet-level protocol behavior, with experience using Wireshark, Scapy, nmap, Burp, or equivalent tools.
Hands-on Rust experience, including async programming, tokio, FFI, socket-level or raw-packet networking, and Python for prototyping and analysis.
Strong Linux experience, including netfilter/eBPF, namespaces, the network stack, and virtualized test labs.
Hands-on infrastructure penetration testing or vulnerability research experience, with demonstrable results such as CVEs, advisories, published tools, or write-ups.

Responsibilities

Research and exploit vulnerabilities in network protocols and implementations, including TCP/IP, TLS, DNS, HTTP/2–3, QUIC, VPN, routing, and Wi-Fi, as well as in exposed devices and services.
Develop security testing tools in Rust, including protocol fuzzers, scanners, packet-crafting tools, traffic parsers, and high-performance detection components.
Reverse engineer proprietary protocols and network firmware or services, and write proof-of-concept demonstrations and exploits for identified vulnerabilities.
Emulate network attack techniques, including lateral movement, man-in-the-middle attacks, tunneling, command-and-control, and exfiltration, and build datasets and signatures for detection.
Collaborate with the machine learning team on feature engineering and traffic anomaly detection models.

Desired Qualifications

Applied machine learning on network traffic, including anomaly detection, classification, PyTorch, or scikit-learn.
Experience with eBPF/XDP, DPDK, or other high-speed packet-processing technologies.
Firmware reverse engineering for IoT, routers, or embedded devices.
Malware analysis focused on command-and-control communication and custom protocols.
Participation in capture-the-flag competitions in pwn or network categories, or bug bounty programs.

Bitdefender is a cybersecurity leader delivering best-in-class threat prevention, detection, and response solutions worldwide. Guardian over millions of consumer, enterprise, and government environments, Bitdefender is one of the industry’s most trusted experts for eliminating threats, protecting privacy, digital identity and data, and enabling cyber resilience. With deep investments in research and development, Bitdefender Labs discovers hundreds of new threats each minute and validates billions of threat queries daily. The company has pioneered breakthrough innovations in antimalware, IoT security, behavioral analytics, and artificial intelligence and its technology is licensed by more than 180 of the world’s most recognized technology brands. Founded in 2001, Bitdefender has customers in 170+ countries with offices around the world. For more information, visit https://www.bitdefender.com

We are looking for a Security Researcher with strong experience in network attacks and protocols and solid Rust development skills, to identify vulnerabilities in the networking stack, build high-performance offensive and detection tooling, and contribute to models for detecting malicious traffic.

Responsibilities

Research and exploit vulnerabilities in network protocols and implementations (TCP/IP, TLS, DNS, HTTP/2–3, QUIC, VPN, routing, Wi-Fi) and in exposed devices and services.
Develop security testing tools in Rust: protocol fuzzers, scanners, packet crafting, traffic parsers and high-performance detection components.
Reverse engineer proprietary protocols and network firmware/services; write PoCs and exploits for the vulnerabilities identified.
Emulate network attack techniques (lateral movement, MITM, tunneling, C2, exfiltration) and build datasets and signatures for detection.
Collaborate with the ML team on feature engineering and traffic anomaly detection models.

Requirements

3–5+ years of experience in network security / offensive security / research;
Very good knowledge of network attacks and of how protocols work at the packet level; experience with Wireshark, Scapy, nmap, Burp or equivalents;
Hands-on Rust experience (async, tokio, FFI, socket-level or raw-packet networking); Python for prototyping and analysis;
Strong Linux experience (netfilter/eBPF, namespaces, network stack) and with virtualized test labs;
Hands-on infrastructure pentesting or vulnerability research experience, with demonstrable results (CVEs, advisories, published tools, write-ups).

Nice to have

Applied ML on network traffic (anomaly detection, classification, PyTorch / scikit-learn);
Experience with eBPF/XDP, DPDK or other high-speed packet processing technologies;
Firmware reverse engineering (IoT, routers, embedded devices);
Malware analysis with a focus on C2 communication and custom protocols;
Participation in CTFs (pwn/network categories) or bug bounty programs.

#LI-SA1

About the Company

Bitdefender

Malware protection software via machine learning

Bitdefender is a cybersecurity company that protects people and organizations by offering a range of security products and services. Its offerings cover prevention, hardening, risk management, and incident analytics for government bodies, large enterprises, SMEs, and individuals, sold through a global network of partners. The company uses advanced machine learning and deep learning to detect malware and other online threats, continuously updating its technology through rapid research and development. Bitdefender distinguishes itself with a strong emphasis on R&D, demonstrated by hundreds of engineers and researchers and a high patent output over the past few years, as well as its broad global reach. The company’s goal is to keep families and businesses safe online by delivering reliable, AI-powered security solutions and ongoing threat intelligence, across countries and sectors.

Company size: 1,001-5,000
Company stage: Private
Total funding: $13.3M
Headquarters: Bucharest, Romania
Founded: 2001

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