Senior Modem Stack Engineer - Real-Time Wireless Protocols

Mars Recruitment; Oxford; Hybrid; GBP 90,000 - 98,000; Full time

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Job summary

MARS Recruitment is partnering with an Oxford-based start-up to hire a Senior Modem Stack Engineer. The role focuses on developing and maturing a real-time protocol stack above PHY, delivering robust communications services in a hybrid Oxford setup (1 day onsite).

You will implement MAC behavior, link control and higher-layer interfaces in C/C++. Candidates should have strong C/C++ experience in real-time or embedded environments, expertise in MAC/PHY concepts, Linux-based development, and the

Qualifications

• Strong professional C/C++ experience developing real-time, embedded or performance-sensitive communications software.
• Practical experience developing wireless MAC, modem protocol-stack or closely related communications software.
• Strong understanding of MAC layer concepts such as framing, scheduling or channel access, buffering, retransmission, link state and traffic handling.
• Experience implementing adaptive link control or radio resource logic that responds to measured channel or link conditions.
• Good understanding of the PHY/MAC boundary, including how link quality measurements, operating modes and timing constraints are exposed to higher layer control software.
• Good networking fundamentals, including packet-oriented interfaces and practical familiarity with IPv4/IPv6 and common transport or link interfaces.
• Experience developing on Linux and/or embedded Linux platforms, including multithreading, concurrency, timing sensitive software and system-level debugging.
• Ability to design clean, modular interfaces between protocol software, physical layer software, embedded platform services and higher layer networking.
• Strong debugging and problem-solving skills across distributed or multi-component communications systems.
• Experience with version control, automated testing, code review and disciplined software release practices.
• Ability to work closely with PHY/modem, embedded, platform-integration, verification and systems engineers in a multidisciplinary team.

Responsibilities

• Develop and mature the real-time protocol stack that turns physical-layer capabilities into a robust communications service.
• Own the software above the PHY, including MAC behaviour, link control and adaptation, packet handling, and the interface to higher-layer networking.
• Collaborate with modem, embedded, platform-integration and verification engineers to define clean boundaries between PHY, platform and external network interfaces.
• This is a hands-on C/C++ communications protocol role.

Skills

C/C++

Real-time systems

Embedded Linux

MAC protocol

Networking fundamentals

Linux debugging

Multithreading

Version control

Code review

Collaboration

Job description

MARS Recruitment is partnering with an Oxford-based start-up to hire a Senior Modem Stack Engineer. The role focuses on developing and maturing a real-time protocol stack above PHY, delivering robust communications services in a hybrid Oxford setup (1 day onsite).

You will implement MAC behavior, link control and higher-layer interfaces in C/C++. Candidates should have strong C/C++ experience in real-time or embedded environments, expertise in MAC/PHY concepts, Linux-based development, and the