Graduate Engineer: 5G NR-NTN Protocols (L1/L2)

Skylo; Espoo; On-site; EUR 42,000 - 60,000; Full time

Benefits offered by this job

Competitive compensation packages

Occupational Healthcare and Health and

Elite Insurance and Life Insurance

E-passi including wellness, culture, l

Lunch and commuting benefit

Phone & Internet allowance

Individual learning & development

Job summary

Skylo in Espoo, Finland is seeking a graduate engineer for the Protocol Stack team to design, implement, and validate 5G NR-NTN Layer 1/2 software. You will work on L1/L2 DSP algorithms, MAC schedulers, and NTN-specific adaptations, shipping production code to a live satellite network.

You will learn from senior engineers, collaborate with RF, systems, and integration teams, and contribute to code reviews and technical documentation while using AI coding assistants to enhance the development

Qualifications

• Strong C++ programming experience.
• Bachelor's/Master's/PhD in EE, wireless or CS.
• Knowledge of digital communications and signal processing fundamentals.
• Familiarity with 5G NR or LTE concepts.
• Linux and Git proficiency.
• Strong debugging persistence.
• Clear communication and eagerness to learn.

Responsibilities

• Design and implement 5G NR Layer 1 DSP algorithms for Doppler tracking, CFO pre-compensation, and ICI mitigation in high-velocity satellite environments.
• Write and maintain C++ code within the 5G NR-NTN L1/L2 protocol stack — MAC, and DL/UL schedulers.
• Learn and implement NTN-specific L1 adaptations: extended HARQ timers, timing advance pre-compensation, NTN-aware link adaptation.
• Contribute to MAC scheduler work for NTN: HARQ retransmission management, CE mode scheduling, resource allocation.
• Build test cases, simulation harnesses, and automation to validate L1/L2 against 3GPP specs.
• Support lab and field validation of L1/L2 across LEO/GEO NTN with RF and baseband engineers.
• Debug and root-cause issues in Linux environments using GDB, Valgrind, perf, and Wireshark.
• Translate 3GPP Rel-17/18 NR-NTN specs into software requirements.
• Participate in code reviews, architecture discussions, and technical documentation.
• Use AI coding assistants across the development lifecycle.

Skills

C++ programming

Linux

Git

Debugging

Python

Education

Electrical Engineering / Wireless Communications / Computer Science degree

Tools

MATLAB

Python

Job description

Skylo in Espoo, Finland is seeking a graduate engineer for the Protocol Stack team to design, implement, and validate 5G NR-NTN Layer 1/2 software. You will work on L1/L2 DSP algorithms, MAC schedulers, and NTN-specific adaptations, shipping production code to a live satellite network.

You will learn from senior engineers, collaborate with RF, systems, and integration teams, and contribute to code reviews and technical documentation while using AI coding assistants to enhance the development