ESIM & Device Engineer

About Airalo

Alo! Airalo is the world’s first eSIM store that helps people connect in over 200+ countries and regions across the globe. We are building the next digital service that revolutionizes the telecom industry. We are a travel-tech company and an equal-opportunity environment that values and executes diversity, inclusion, and equity. Our team is spread across 50+ countries and six continents. What glues us together is our commitment to changing the way you connect.

Check out more information about Airalo in our Public Handbook here.

We hope that you care deeply about the quality of your work, the intrinsic worth of tasks, and the success of your team. You are self-disciplined and do not require micromanagement in terms of your skillset and work ethic. You do your best to flourish as an individual every day while working hard to foster a collaborative team environment. You believe in the importance of being — and staying — authentic, honest, positive, and kind.

You are a good interlocutor with clear and concise communication. You are able to manage multiple projects, have an analytical mind, pay keen attention to detail, and love to get your hands dirty. You are cognizant, tolerant, and welcoming of vulnerabilities and cultural differences.

Position:
Full-time / Employee

Location:

Remote-first

Benefits:
Health Insurance, work-from-anywhere stipend, annual wellness & learning credits, annual all-expenses-paid company retreat in a gorgeous destination & other benefits

The eSIM & Device Engineer will join our Core Networks Engineering team. They will be a dedicated specialist focused on Device setting management, driving our mission toward global connectivity!

• Design, develop, and validate eSIM Electrical Profiles (MVNO/Roaming) according to GSMA SGP.
  22 standards.
• Configure file structures ($EF_{ICCID}$, $EF_{IMSI}$, $EF_{PLMN}$, etc.) and ensure correct applet loading.
• Manage the generation and testing of Input Files for Subscription Management platforms (SM-DP+).
• Conduct rigorous testing on the latest iOS and Android flagships (e.g., iPhone 15/16, Samsung S24, Pixel
  9) and mid-range devices from global markets (APAC/LATAM/EMEA).
• Validate the Local Profile Assistant (LPA) behavior during the Remote SIM Provisioning (RSP) flow—from QR code scanning to the TLS-secured profile download.
• Plan and execute Over-the-Air (OTA) campaigns to update the eUICC file system ($EF_{PLMN}$, $EF_{IMSI}$) or applet parameters on devices already deployed in the field.
• Use tools like the COMPRION eSIM Tracer or Ul SIMtester to analyze APDU logs and identify failures in Remote File Management (RFM) or Remote Application Management (RAM) over HTTP, or HTTPS (CAT-TP).
• Perform "live" OTA testing using network simulators or global roaming testbeds to verify Steering of Roaming (SoR) updates and ensure the device correctly switches to the preferred partner network.
• Analyze protocol traces (APDU logs) to debug communication issues between the handset and the eUICC.
• Investigate "No Service" or activation failures specific to international roaming steering.
• Optimize profile sizes to ensure fast download speeds over varying network conditions (3G to 5G).

• Three years plus experience in mobile device and OTA configuration and testing
• Experience with Voice (including VoLTE & Vo Wi Fi ), 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)
• Excellent verbal and written communication skills
• Preference for previous experience a Tier 1 Carrier, leading MVNO or an eSIM Vendor (G+D, Thales, IDEMIA).
• Knowledge of Subscription Management orchestration for travel-specific use cases (multi-IMSI, localized breakouts).
• A "problem solver" mindset—willingness to test niche Android variants from different global markets.

• 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)

If you are interested in this position, please apply via the link.

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