Graduate Engineer, Signal Processing

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

Sound Like You? What You Bring

The world still has coverage blind spots. You could help eliminate them at Skylo.

Skylo has pioneered a standards-based approach to satellite connectivity. We connect smartphones and IoT devices directly to satellites. No special hardware, no entirely new networks. Just billions of existing devices, suddenly reachable anywhere on Earth. We're not building toward this future. We're already in it. Our direct-to-device service is live on millions of activated devices across five continents, covering more than 72 million square kilometers, in partnership with leading satellite operators, mobile network operators, Tier-1 chipset makers, and OEMs worldwide. And we're just getting started. At the heart of it all is Skylo's commercial NTN vRAN: a 3GPP standards-based, cloud-native platform that seamlessly bridges terrestrial and satellite networks. It's the infrastructure that makes true anywhere, anytime connectivity possible. When you join Skylo, you'll work at the intersection of three markets reshaping how the world stays connected: mass-market consumer devices, automotive, and industrial IoT. Enabling people outdoors and critical workflows in the world's most remote places.

This is a rare chance to work on technology that matters, at a company that's already proving it works

This role is based in Espoo, Finland, one of Skylo's core engineering hubs and fastest-growing sites. You'll work onsite three days a week as part of a team that's scaling quickly.

How You Will Impact Skylo

Skylo is looking for a graduate engineer to join our Protocol Stack team, working on 5G New Radio Non-Terrestrial Network (NR-NTN) Layer 1 and Layer 2 protocol implementations. You'll learn to design, implement, and validate PHY, MAC, FAPI, and scheduler software running on Skylo's NTN vRAN platform — with mentorship from senior engineers and close collaboration with our RF, systems, and integration teams. This is a hands‑on role on real production software. You will not be writing throwaway code: what you build ships to a live satellite network.

What You'll Do

• L1 Algorithm & Doppler Compensation: Design and implement 5G NR Layer 1 DSP algorithms for dynamic Doppler tracking, CFO pre-compensation, and ICI mitigation in high-velocity satellite environments.
• Write and maintain C++ code within our 5G NR-NTN L1/L2 protocol stack — MAC, and DL/UL schedulers — starting with well-scoped modules and growing into larger components
• Learn and implement NTN-specific L1 adaptations: extended HARQ round-trip timers, timing advance pre-compensation, NTN-aware link adaptation, and satellite Doppler pre-compensation
• Contribute to MAC scheduler work for NTN: HARQ retransmission management, coverage enhancement (CE) mode scheduling, and constellation‑aware resource allocation
• Build test cases, simulation harnesses, and automation to validate L1/L2 behaviour against 3GPP specifications
• Support lab and field validation of L1/L2 protocol behaviour across LEO/GEO NTN environments alongside RF and baseband engineers
• Debug and root-cause issues in Linux environments using GDB, Valgrind, perf, and Wireshark — building the debugging instincts that define strong protocol engineers
• Work with systems engineers to translate 3GPP Rel-17/18 NR-NTN specifications into software requirements
• Participate in code reviews, architecture discussions, and technical documentation
• Use AI coding assistants (Claude, Cursor, Codex) across the development lifecycle — from spec interpretation to test automation to code review — and help shape how the team works with them

Sound Like You? What You Bring

Essential

• Strong programming ability in C++ — you've written non-trivial C++ (university projects, internships, open source, or personal work) and understand memory management, pointers/references, and the standard library. This is our top priority.
• Bachelor's, Master's, or PhD in Electrical Engineering, Wireless Communications, Telecommunications, Computer Science, or a closely related field
• Working knowledge of digital communications and signal processing fundamentals: modulation, channel coding, OFDM, link budgets
• Familiarity with 5G NR or LTE concepts from coursework, projects, or research — frame/slot structure, HARQ, scheduling
• Comfortable working in Linux and with version control (Git)
• Curiosity and persistence when debugging: you enjoy chasing a problem until you understand the root cause
• Clear communication and a genuine appetite to learn from experienced engineers

Nice to Have

• Internship, thesis, or research experience in wireless protocol development, baseband, or SDR (srsRAN, OpenAirInterface, GNU Radio)
• Exposure to 5G NR PHY details: numerologies, PDSCH/PUSCH processing, beamforming, link adaptation
• Exposure to 5G NR MAC: scheduling procedures, HARQ management, BSR/SR/PHR handling, random access
• Awareness of FAPI (nFAPI or SCF FAPI) and split L1/L2 architectures
• MATLAB or Python for algorithm prototyping and analysis
• Any experience with multi-threaded or real-time software
• Interest in satellite communications and NTN

Prior professional experience is a plus. We hire graduates for their fundamentals and their trajectory, and we invest in the rest.

What We Offer

This is a once-in-a-lifetime opportunity to help build and run the world's first commercial, live direct-to-device satellite network. You'll work alongside a world-class team spanning software, hardware, chipsets, telecom, satellite, and network virtualization, some of the most sought-after expertise in the industry. And you'll do it inside a culture that is open, transparent, and inclusive, shaped by the best of Silicon Valley, Nordic, and South Asian ways of working.

Benefits

• Competitive compensation packages
• Occupational Healthcare and Health and Life Insurance
• E-passi including, wellness, culture, lunch and commuting benefit
• Phone & Internet allowance
• Individual learning & development budget for further personal and professional development

EEO Statement

Skylo is an equal‑opportunity employer and we celebrate diversity. We do not discriminate on the basis of race, religion, color, ancestry, national origin, caste, sex, sexual orientation, parent or caregiver status, political affiliation, gender, gender identity or expression, age, disability, medical condition, pregnancy, genetic makeup, marital status, or military service consistent with applicable federal, state, and local laws.

We are also committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. Please let us know if you need assistance or accommodation due to a disability.