{"id":351974,"url":"https://alion.io/job/skylo-technologies-graduate-engineer-signal-processing","title":"Graduate Engineer, Signal Processing","company":{"id":5519,"name":"Skylo Technologies","domain":"skylo.tech","url":"https://alion.io/company/skylo-technologies","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"A","score":89,"open_postings":7,"ghost_share":0,"stale_share":0.429,"repost_share":0,"time_to_fill_p50_days":48,"computed_at":"2026-10-12T06:55:09Z"}},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"junior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Espoo, Finland"],"countries":["FI"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":29000,"max_usd":75000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":2447},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"Claude","optional":false},{"name":"Cursor","optional":false},{"name":"Git","optional":false},{"name":"Layer 2","optional":false},{"name":"Linux","optional":false},{"name":"OpenAI Codex","optional":false},{"name":"Valgrind","optional":false},{"name":"Wireshark","optional":false},{"name":"C","optional":true},{"name":"MATLAB","optional":true},{"name":"Python","optional":true}],"status":"closed","first_seen_at":"2026-08-28T12:31:23Z","employer_posted_date":"2026-09-25","last_verified_at":"2026-09-30T19:39:46Z","board_verified":false,"closed_at":"2026-09-30T19:39:46Z","days_open":33,"trust":{"level":"ok","repost_count":1,"flags":[],"days_open":32},"description":"The world still has coverage blind spots. You could help eliminate them at Skylo.\nSkylo 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.\nOur 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.\nAt 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.\nWhen 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.\nThis is a rare chance to work on technology that matters, at a company that's already proving it works\nThis 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.\nHow You Will Impact Skylo\nSkylo 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.\nThis 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.\nWhat You'll Do\nL1 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.\n\nWrite 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\n\nLearn and implement NTN-specific L1 adaptations: extended HARQ round-trip timers, timing advance pre-compensation, NTN-aware link adaptation, and satellite Doppler pre-compensation\n\nContribute to MAC scheduler work for NTN: HARQ retransmission management, coverage enhancement (CE) mode scheduling, and constellation-aware resource allocation\n\nBuild test cases, simulation harnesses, and automation to validate L1/L2 behaviour against 3GPP specifications\n\nSupport lab and field validation of L1/L2 protocol behaviour across LEO/GEO NTN environments alongside RF and baseband engineers\n\nDebug and root-cause issues in Linux environments using GDB, Valgrind, perf, and Wireshark - building the debugging instincts that define strong protocol engineers\n\nWork with systems engineers to translate 3GPP Rel-17/18 NR-NTN specifications into software requirements\n\nParticipate in code reviews, architecture discussions, and technical documentation\n\nUse 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\n\nSound Like You? What You Bring\nEssential\nStrong 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.\n\nBachelor's, Master's, or PhD in Electrical Engineering, Wireless Communications, Telecommunications, Computer Science, or a closely related field\n\nWorking knowledge of digital communications and signal processing fundamentals: modulation, channel coding, OFDM, link budgets\n\nFamiliarity with 5G NR or LTE concepts from coursework, projects, or research - frame/slot structure, HARQ, scheduling\n\nComfortable working in Linux and with version control (Git)\n\nCuriosity and persistence when debugging: you enjoy chasing a problem until you understand the root cause\n\nClear communication and a genuine appetite to learn from experienced engineers\n\nNice to Have\nInternship, thesis, or research experience in wireless protocol development, baseband, or SDR (srsRAN, OpenAirInterface, GNU Radio)\n\nExposure to 5G NR PHY details: numerologies, PDSCH/PUSCH processing, beamforming, link adaptation\n\nExposure to 5G NR MAC: scheduling procedures, HARQ management, BSR/SR/PHR handling, random access\n\nAwareness of FAPI (nFAPI or SCF FAPI) and split L1/L2 architectures\n\nMATLAB or Python for algorithm prototyping and analysis\n\nAny experience with multi-threaded or real-time software\n\nInterest in satellite communications and NTN\n\nPrior professional experience is a plus. We hire graduates for their fundamentals and their trajectory, and we invest in the rest.\nWhat We Offer\nThis 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.\nWith 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:\nCompetitive compensation packages\n\nOccupational Healthcare and Health and Life Insurance\n\nE-passi including, wellness, culture, lunch and commuting benefit\n\nPhone & Internet allowance\n\nIndividual learning & development budget for further personal and professional development\n\nReady To Join Us?\nApply 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.\nStill have questions? Teea Salomaa, our Senior Recruiter, has answers. Say hello at .\nEEO Statement\nSkylo 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.\nWe are also committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. 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