Mid/Senior Software Engineer – Network & Security Focus

This is a fully remote position, open to applicants in Poland.

📋 Description

• Designing, implementing, and maintaining network and security functionalities (firewall, NAT, proxy, intrusion prevention, filtering)

• Integrating with kernel or low-level modules (netfilter, packet capture/forwarding logic)

• Developing sophisticated traffic inspection and filtering mechanisms (URL filtering, protocol analysis, deep packet inspection)

• Diagnosing intricate network failures (asymmetrical routing, NAT/firewall interactions, dropped reply traffic)

• Collaborating with architects, QA, and other engineers on secure network infrastructures

• Interpreting and applying protocol and security specifications (IP, TCP, HTTP, SSL/TLS)

• Ensuring optimal performance, security, and reliability in production environments

⛳️ Requirements

• Strong programming capabilities, with around 50% in C/C++ for low-level modules (embedded) and 50% in Python

• Solid understanding of computer networks: IP, TCP/UDP, routing, NAT, proxy patterns

• Comprehensive knowledge of firewall and security systems: packet filtering, stateful firewalls, URL filtering, IPS/IDS

• Experience in debugging complex traffic scenarios (traffic moves forward but replies do not return)

• Proficiency in implementing or utilizing proxies, inspection, and HTTP/HTTPS parsing

• Familiarity with kernel-level or system-level network hooks/modules (Linux netfilter, packet sockets)

• Good command of English (B2 level or higher)

🏝️ Benefits

• Flexible working hours and approach to work: fully remotely, in the office, or hybrid

• Professional development supported by internal training sessions and a training budget

• Comprehensive onboarding with a hands-on approach to ensure an easy start

• A great atmosphere among professionals who are dedicated to their work