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Mid/Senior Software Engineer – Network & Security Focus at CodiLime | JobVerse
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Mid/Senior Software Engineer – Network & Security Focus
CodiLime
Remote
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Mid/Senior Software Engineer – Network & Security Focus
Poland
Contract
3 days ago
$17,000 - $23,500 PLN
Apply Now
Key skills
Firewalls
Linux
Python
C++
C
Firewall
About this role
Role Overview
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
Requirements
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)
Tech Stack
Firewalls
Linux
Python
Benefits
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
Apply Now
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