About The Role

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 worksThis 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 SkyloSkylo 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 DoL1 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 componentsLearn and implement NTN-specific L1 adaptations: extended HARQ round-trip timers, timing advance pre-compensation, NTN-aware link adaptation, and satellite Doppler pre-compensationContribute to MAC scheduler work for NTN: HARQ retransmission management, coverage enhancement (CE) mode scheduling, and constellation-aware resource allocationBuild test cases, simulation harnesses, and automation to validate L1/L2 behaviour against 3GPP specificationsSupport lab and field validation of L1/L2 protocol behaviour across LEO/GEO NTN environments alongside RF and baseband engineersDebug and root-cause issues in Linux environments using GDB, Valgrind, perf, and Wireshark — building the debugging instincts that define strong protocol engineersWork with systems engineers to translate 3GPP Rel-17/18 NR-NTN specifications into software requirementsParticipate in code reviews, architecture discussions, and technical documentationUse 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 BringEssentialStrong 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 fieldWorking knowledge of digital communications and signal processing fundamentals: modulation, channel coding, OFDM, link budgetsFamiliarity with 5G NR or LTE concepts from coursework, projects, or research — frame/slot structure, HARQ, schedulingComfortable working in Linux and with version control (Git)Curiosity and persistence when debugging: you enjoy chasing a problem until you understand the root causeClear communication and a genuine appetite to learn from experienced engineers Nice to HaveInternship, 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 adaptationExposure to 5G NR MAC: scheduling procedures, HARQ management, BSR/SR/PHR handling, random accessAwareness of FAPI (nFAPI or SCF FAPI) and split L1/L2 architecturesMATLAB or Python for algorithm prototyping and analysisAny experience with multi-threaded or real-time softwareInterest in satellite communications and NTNPrior professional experience is a plus. We hire graduates for their fundamentals and their trajectory, and we invest in the rest. What We OfferThis 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's open, transparent, and inclusive, shaped by the best of Silicon Valley, Nordic, and South Asian ways of working. With employees working across three continents, Skylo is proud to be an equal opportunity employer dedicated to building an inclusive and diverse workforce. Our worldwide and inclusive culture encourages a flexible approach to work, and we also offer an attractive range benefits such as:Competitive compensation packagesOccupational Healthcare and Health and Life InsuranceE-passi including, wellness, culture, lunch and commuting benefitPhone & Internet allowanceIndividual learning & development budget for further personal and professional development Ready To Join Us?Apply now and a member of our recruiting team will be in touch. We review applications on an ongoing basis, so we encourage you to apply early. Our process includes an initial call with a recruiter, a take-home assignment, and two interviews with different team members. Still have questions? Teea Salomaa, our Senior Recruiter, has answers. Say hello at <[email hidden]>. EEO StatementSkylo 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.