eSIM & Device Engineer

TL;DR

eSIM & Device Engineer: Designing, developing, and validating eSIM electrical profiles and managing subscription platforms for global connectivity with an accent on GSMA standards, OTA campaigns, and device compatibility across iOS and Android flagships. Focus on debugging communication issues, optimizing profile sizes, and ensuring seamless international roaming steering.

Location: Remote-first, must be based in Spain or United Kingdom

Company

hirify.global is the world’s first eSIM store, building a digital service to revolutionize the telecom industry as a travel-tech company.

What you will do

• Design, develop, and validate eSIM Electrical Profiles according to GSMA SGP.22 standards.
• Manage the generation and testing of Input Files for Subscription Management platforms (SM-DP+).
• Conduct rigorous testing on the latest iOS and Android flagships, validating Local Profile Assistant (LPA) behavior.
• Plan and execute Over-the-Air (OTA) campaigns to update eUICC file systems or applet parameters on deployed devices.
• Use tools like COMPRION eSIM Tracer to analyze APDU logs and identify failures in Remote File Management (RFM) or Remote Application Management (RAM).
• Perform "live" OTA testing and investigate "No Service" or activation failures specific to international roaming steering.

Requirements

• Three years plus experience in mobile device and OTA configuration and testing.
• Experience with Voice (including VoLTE & VoWiFi), SMS and Data (APN settings).
• Expertise in Device settings for iOS Apple (Carrier Bundle) and Android, including initiatives such as GSMA Network Settings Exchange (NSX).
• Knowledge of Subscription Management orchestration for travel-specific use cases.
• A "problem solver" mindset, willing to test niche Android variants from different global markets.
• Excellent verbal and written communication skills.

Nice to have

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

Culture & Benefits

• Remote-first work environment with work-from-anywhere stipend.
• Health Insurance, annual wellness & learning credits.
• Annual all-expenses-paid company retreat in a gorgeous destination.
• Collaborative and diverse team spread across 50+ countries.
• Commitment to authenticity, honesty, positivity, and kindness.