5G RAN L1/PHY Engineer Position

Position: 5G RAN L1/PHY Engineer

Type of Contract: Full-time, Permanent

Start Date: Immediate

Location: United States

Eligibility: Candidates must be based in the United States and authorized to work in the United States.

Job Description

The OAI L1 5G stack is a fully open-source implementation of the 5G/NR physical layer (3GPP 38.2xx, Rel. 15), written in C and running on generic Intel/AMD-based and ARM-based CPUs.

It supports both gNB and UE implementations, covering:

All FR1 bandwidths with 256-QAM
SISO and up to 4-layer MIMO in both downlink and uplink
100 MHz and 200 MHz bandwidths in FR2

The stack includes all control and transport channels required for 5G standalone (SA) operation, along with SRS and CSI-RS support for advanced MIMO functionalities, including Massive MIMO.

The full list of supported features can be found here: https://gitlab.eurecom.fr/oai/openairinterface5g/-/blob/develop/doc/FEATURE_SET.md#gnb-phy.

You will contribute to the improvement of the 5G L1/PHY stack of OAI. Specifically, you will start working on the L1/PHY of the gNB:

Support with the implementation of digital beamforming in the downlink
Support with the integration of the OSC xRAN library into OAI and testing of the 7.2 interface
Support of Implementation activites towards Cat-B O-RU handling in the OAI DU

We are seeking a telecom software development engineer with strong expertise in C/C++. The applicant should have a deep understanding of 3GPP 5G/NR L1 operations as well as O-RAN Open Fronthaul Interface specifications.

This includes hands-on experience implementing 3GPP specifications in code (L1 required, L2/L3 as a plus). Prior experience with 5G/NR L1 implementations or the MATLAB toolbox is a strong advantage. Contributions to the UE L1/PHY stack may be considered as a follow-up.

GitLab link: https://gitlab.eurecom.fr/oai/openairinterface5g/

Required / Mandatory Skills

Very strong C/C++ skills
Very good knowledge of 3GPP 5G/NR L1 operation and O-RAN Open Fronthaul Interface specifications
Solid experience in RAN software development (L1 required, L2/L3 is a plus) and use of SIMD intrinsics
Very good understanding of Git SCM
Experience with 5G/NR L1 implementations or MATLAB is a plus

Qualifications

Work experience of a minimum of 3 years
Master’s degree in Computer Science, Telecommunications, or equivalent
Strong analytical and problem-solving skills
Good interpersonal and teamwork skills to collaborate and work well with others

Salary

Commensurate with experience and skill set

Why Join Us?

Contribute to one of the most impactful open-source communities in cellular networks
Work with cutting-edge technologies in 5G and 6G
Gain international exposure through collaboration with industry leaders and open networking communities
Be part of an organization that values autonomy, fosters mastery, and is driven by a strong sense of purpose

Ready to apply?

Send your application to careers@openairinterface.org

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