Designing, implementing, and maintaining network/security features (firewall, NAT, proxy, intrusion prevention, filtering)
Integrating with kernel or low-level modules (netfilter, packet capture/forwarding logic)
Building advanced traffic inspection and filtering logic (URL filtering, protocol analysis, deep packet inspection)
Troubleshooting complex network failures (asymmetrical routing, NAT/firewall interactions, dropped reply traffic)
Collaborating with architects, QA, and other engineers on secure network systems
Reading and applying protocol & security specs (IP, TCP, HTTP, SSL/TLS)
Ensuring performance, security, and robustness in production environments

Strong programming skills, with approximately 50% in C/C++ for low-level modules (embedded) and 50% in Python
Solid foundation in computer networks: IP, TCP/UDP, routing, NAT, proxy patterns
Deep understanding of firewall/security systems: packet filtering, stateful firewalls, URL filtering, IPS/IDS
Experience debugging tricky traffic flows (traffic goes forward but reply doesn’t return)
Ability to implement or consume proxy, inspection, HTTP/HTTPS parsing
Experience with kernel-level or system-level network hooks/modules (Linux netfilter, packet sockets)
Good command of English (B2 level or higher)

Flexible working hours and approach to work: fully remotely, in the office or hybrid
Professional growth supported by internal training sessions and a training budget
Solid onboarding with a hands-on approach to give you an easy start
A great atmosphere among professionals who are passionate about their work

Mid/Senior Software Engineer – Network & Security Focus

Key skills