Senior Modem Integration Engineer (5G NTN)

Sasken Finland Oy; Tampere; On-site; EUR 70,000 - 110,000; Full time

Job summary

Sasken Finland Oy seeks a (Senior) Modem Integration Engineer to join our Tampere-based software team. You will own the integration of the PHY layer with the modem stack across a multi-processor 5G NTN user terminal architecture.

You will focus on the MAC-PHY interface (FAPI/nFAPI) over PCIe and shared memory, handling message flows, timing, cache coherency and boundary behaviors. You will mentor junior engineers and collaborate with IP vendors and customers to ensure reliable satellite link

Qualifications

• Hands-on experience integrating 5G/LTE modem software at MAC-PHY boundary.
• Strong knowledge of PHY concepts (OFDM, MIMO, channel coding, synchronization).
• Practical experience with FAPI/nFAPI.
• Strong C/C++ and embedded experience with RTOS.
• Experience with multi-processor and cross-processor debugging.
• Excellent cross-disciplinary communication skills.

Responsibilities

• Integrate L1 (PHY) and L2/L3 (MAC, RLC, PDCP, RRC, NAS) software on multi-processor 5G NTN user terminal.
• Own the MAC-PHY interface based on FAPI/nFAPI over PCIe and shared memory, including message flows, timing, buffer ownership and cache coherency
• Debug end-to-end failures across processors and drive resolution with internal teams and third-party vendors
• Contribute to the software architecture, interface control documents, integration plans, verification plans and technical risk assessments
• Support system-level integration with the antenna control unit, host controller and RF subsystem, including satellite acquisition, tracking and handover flows
• Work directly with customers, satellite operators and IP vendors in technical reviews, integration workshops and issue-resolution sessions
• Mentor junior engineers on FAPI, MAC-PHY integration, real-time debugging and cross-processor system behaviour based on your experience

Skills

MAC-PHY integration

C/C++ programming

Embedded software development

Real-time OS

Cross-processor debugging

ARM/RISC processors

Embedded Linux

System architecture collaboration

Satellite/NTN knowledge

Education

B.Sc. or M.Sc. in Embedded Systems / Electronics / Software Engineering

Tools

FAPI/nFAPI interface

PCIe

Shared memory IPC

Job description

Sasken Finland Oy seeks a (Senior) Modem Integration Engineer to join our Tampere-based software team. You will own the integration of the PHY layer with the modem stack across a multi-processor 5G NTN user terminal architecture.

You will focus on the MAC-PHY interface (FAPI/nFAPI) over PCIe and shared memory, handling message flows, timing, cache coherency and boundary behaviors. You will mentor junior engineers and collaborate with IP vendors and customers to ensure reliable satellite link