Esim & Device Engineer (Telecom)

TL;DR

eSIM & Device Engineer (Telecom): Focused on Device setting management, joining the Core Networks Engineering team and driving the mission toward global connectivity with an accent on eSIM Electrical Profiles design and validation. Focus on rigorous testing of Local Profile Assistant behavior and executing Over-the-Air campaigns to update eUICC file systems.

Location: Remote-first

Company

hirify.global is the world’s first eSIM store that helps people connect in over 200+ countries and regions across the globe.

What you will do

• Design and validate eSIM Electrical Profiles (MVNO/Roaming) following GSMA SGP.22 standards.
• Rigorously test the Local Profile Assistant (LPA) behavior to ensure flawless Remote SIM Provisioning.
• Plan and execute Over-the-Air (OTA) campaigns to update eUICC file systems and steering logic for devices already deployed globally.
• Use tools to analyze APDU logs and debug communication failures in Remote File Management (RFM).
• Verify Steering of Roaming (SoR) logic on global testbeds, ensuring users always land on the fastest partner network.
• Minimize profile sizes to guarantee fast downloads over 3G, 4G, and 5G network conditions.

Requirements

• 3+ years in mobile device configuration, OTA testing, and managing carrier settings (VoLTE, VoWiFi, APNs).
• Deep knowledge of Apple Carrier Bundles and Android network settings (GSMA NSX).
• Comfortable navigating EF structures (ICCID, IMSI, PLMN) and analyzing TLS-secured profile downloads.
• Experience working at a Tier 1 Carrier, an MVNO, or a top-tier eSIM vendor (G+D, Thales, IDEMIA).
• Familiarity with Subscription Management orchestration and a "problem-solver" mindset for niche global hardware.
• Fluent English is essential for collaborating across our 50+ country remote team.

Nice to have

• Remote testing (e.g. Segron, Mobilium) experience
• Experience with OTA systems e.g. Thales
• Knowledge of mobile network call flows (signalling) for 4G and 5G
• Scripting languages (e.g. python)

Culture & Benefits

• Health Insurance
• Work-from-anywhere stipend
• Annual wellness & learning credits
• Annual all-expenses-paid company retreat in a gorgeous destination