Last seen September 7, 2026
Posted June 3, 2026 · 96 days ago
Open 96 days, longer than the usual 30 for this role
Est. expiry July 8, 2026

Senior Software Engineer – NR-NTN Protocols (L3 & L4 / Core Interfaces)

Software Engineer
Espoo, Finland
HybridFull-time, Senior
Estimated €5,512 - €7,108
At a glance

Senior Software Engineer at Skylo in Espoo, hybrid role building NTN protocols.

Original job description

<p style=\"min-height:1.5em\"><strong>The world still has coverage blind spots. You could help eliminate them at Skylo.</strong></p><p style=\"min-height:1.5em\">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.</p><p style=\"min-height:1.5em\">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.</p><p style=\"min-height:1.5em\">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.</p><p style=\"min-height:1.5em\">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.</p><p style=\"min-height:1.5em\"><strong>This is a rare chance to work on technology that matters, at a company that's already proving it works</strong></p><p style=\"min-height:1.5em\"><em>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.</em></p><p style=\"min-height:1.5em\"></p>

The text above is the employer's original job description, extracted as written. Other details on this page, like salary, responsibilities, and requirements, are interpreted from that text by our system, not values the employer explicitly confirmed, so treat them as our best interpretation rather than verified facts.

How this salary compares
Estimated €5,512 - €7,108Est. take-home €3,680 - €4,462

Estimated from 848 comparable listings

14% above Software Engineer in Espoo, Finland
€3,063€6,200 median€8,000
Responsibilities
  • Design, develop, and maintain C++ implementations of 5G NR upper-layer and core interface protocols
  • Implement NTN-specific PDCP adaptations
  • Develop and maintain eGTP-U tunnelling for N3 user-plane
  • Implement Xn interface procedures (XnAP)
  • Implement and maintain NGAP procedures over the N2 interface
  • Develop NTN-aware N2/N3 signalling enhancements
  • Collaborate with Core Network and MNO integration teams
  • Integrate and validate Xn/N2/N3 interfaces end-to-end
  • Debug, root-cause analysis, performance tuning
  • Collaborate with systems engineers to translate 3GPP specs
  • Participate in code reviews and documentation
  • Use AI coding assistants throughout development
Requirements
  • 2+ years of hands-on software engineering experience in wireless/telecom protocol development
  • Master's or PhD degree in Wireless Communications, Electrical Engineering, Telecommunications, or a closely related field
  • Strong proficiency in C++ (C++14/17)
  • Deep knowledge of PDCP
  • Strong understanding of eGTP (GTP-U and GTP-C)
  • Solid understanding of Xn interface (XnAP TS 38.423)
  • Strong understanding of NGAP (TS 38.413)
  • Experience with Linux debugging tools
  • Proficiency in production-grade protocol software
  • Ability to read and independently derive software requirements from 3GPP specifications
Skylo logo
Skylo · 11 open roles
Top locations: Espoo, Finland · 8
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Current open roles at Skylo on JobCrawls
LocationActive listings
Espoo, Finland8
Current role mix at Skylo on JobCrawls
Role typeActive listings
Software Engineer3
System Test Engineer1
HR Manager1
Senior Staff Engineer1
Program Manager1
Senior Systems Engineer1
Current role-level mix at Skylo on JobCrawls
Role levelActive listings
Senior4
Mid-Level2
Manager2
About the employer

Skylo is an equal-opportunity employer committed to diversity and inclusion. We offer a flexible, global culture and a strong benefits package.

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