Network Systems Developer

Kyber; Paris; Hybrid; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Health Insurance

Transportation card (50% supported)

Job summary

Kyber, an open-source SDK and platform developer based in the Paris area, seeks a senior network software engineer to design and optimize critical components and address performance and security concerns. You will debug at kernel and user levels, write solid documentation, and participate in architecture reviews.

The role emphasizes cross‑platform work across Linux, macOS, Windows, and embedded environments.

Qualifications

• 5–10 years of professional software development experience focusing on network programming.
• Embedded or constrained environments experience is required or beneficial.
• Familiarity with media pipelines, real-time communication, or streaming infrastructure.
• Knowledge of kernel-level networking or custom transport implementations is a plus.
• Experience working with Linux, macOS, Windows, and embedded OS cross-platform systems.
• Strong autonomy, rigor, and mentoring ability.

Responsibilities

• Design, develop, and optimize network system components for Kyber.
• Investigate and resolve performance, memory, synchronization, and security issues.
• Conduct advanced debugging (crash dumps, kernel debugging, stack analysis).
• Write clear, durable technical documentation.
• Participate in architecture decisions and code reviews.
• Monitor Windows internals and system-level tooling.

Skills

Network architecture

TCP/IP

QUIC

Rust/C/C++

Low-level debugging

Git

Tools

Git

Cross-platform development

Job description

Salary aligned with the market + typical French benefits (Health Insurance, 50% Transportation card)

About Kyber

Kyber is an open-source SDK and platform to control remote machines, from Remote Desktop to Robots Teleoperation/Teleobservation. Kyber is a multi-stream and multi-actuator transport in extremely-low latency, over the quic protocol.

Clients use Kyber to control robots, drones, desktop, servers in the cloud or just remote rendering of interactive 3D programs. Kyber is done for Remote RealTime, where every millisecond matters.

Kyber is developed by engineers from the VLC and FFmpeg community, and we code in Rust, in C and in assembly. We have some development in Go too.

We're a quite technical team, but cool to work with.

We are based in Paris area and open to Remote Work in Europe. Full time only.

Role

The successful candidate will be responsible for:

• Designing, developing, and optimizing Network system components for Kyber
• Investigating and resolving complex issues related to performance, memory management, synchronization, and security
• Performing advanced debugging (crash dump analysis, kernel debugging, stack analysis, occasional reverse engineering)
• Writing clear and durable technical documentation
• Participating in low-level architecture decisions and critical code reviews
• Conducting continuous technical watch on Windows internals and system-level tooling

Required Technical Skills

• Excellent knowledge of network architecture and ecosystems
• Deep understanding of networking fundamentals (TCP/IP, UDP, congestion control, NAT traversal, encryption, streaming pipelines)
• Strong understanding of operating system concepts (threads, scheduling, memory, I/O, sockets)
• Hands-on experience with network debugging and analysis tools
• Proven experience with one or more of the following protocols: QUIC (mandatory), WebRTC, HLS, RTMP, USB over IP
• Programming Languages : C / C++ / Rust / X86/x64
• Tools & Environment : Git and collaborative development workflows

You

• 5 to 10 years of professional experience in software development, with a significant focus on Network programming
• Experience with embedded or constrained environments
• Familiarity with media pipelines, real-time communication, or streaming infrastructure
• Knowledge of kernel-level networking or custom transport implementationsExperience working with cross-platform systems (Linux, macOS, Windows, embedded OS)
• High level of rigor, autonomy, and attention to detail, Strong interest in solving non-trivial technical problems
• Ability to share expertise and mentor junior engineers
• Nice-to-Have Skills : Experience in system security or Windows component hardening, Background in reverse engineering or malware analysis, Contributions to low-level or systems-oriented open-source projects
• Nice-To-Have Skills : Experience in constrained environments (real-time systems, high availability, security-critical software)

Interview Process

• 15-Min Screening Call Quick chat about motivation, fit and answer your non tech questions.
• 2x1-Hour Technical/Product Interview Deeper dive into your problem-solving approach with our CTO and/or our lead solution architect
• Team Meet & Greet Informal session to ensure good culture fit.

What We Offer

• Highly technical and intellectually challenging projects
• An environment that values genuine engineering expertise and that is tech focused (no nonsense meetings or reportings)
• Strong autonomy in technical decision-making