SIM Engineer

Responsibilities

• Support SIM/eSIM profile creation and management across multiple vendor platforms
• Assist with eSIM DP+ operations including profile download, activation, and lifecycle management
• Perform and validate OTA updates for SIM applets and file structures
• Manage SIM logistics such as ordering, fulfillment, stock tracking, and shipment coordination
• Support BAP (Baseline Application Profile) creation and maintenance
• Troubleshoot SIM-related issues reported by customers or internal teams
• Maintain documentation for SIM processes, configurations, and vendor procedures
• Coordinate with Mobile Platform Engineering on HSS/subscription provisioning
• Assist with testing and validation of new SIM features before production rollout

Requirements

• 1-3+ years in telecom, IT, or a related technical field
• Understanding of SIM/UICC fundamentals including file systems (EF/DF structures), applets, and USIM/ISIM
• Basic familiarity with at least one SIM profile creation tool or vendor platform
• Proficiency with scripting or automation using Python, Bash, or similar languages
• Strong written communication skills for documentation and cross-team coordination
• Highly organized and detail-oriented approach to logistics and profile management

Preferred Qualifications

• Experience with eSIM DP+ platforms or RSP systems (SMDP+/SMDS)
• Familiarity with Java Card or SIM applet development
• Understanding of OTA update mechanisms (SCP02, SCP03, SCP80, SCP81)
• Knowledge of GlobalPlatform for secure element lifecycle management
• Understanding of LTE/5G network attach and SIM authentication (AKA, EPS-AKA)
• Experience building AI-assisted workflows to enhance productivity

About the Company

Telnyx is an industry leader building the future of global connectivity. From architecting a private, global, multi-cloud IP network to providing hyperlocal edge technology through intuitive APIs, we are shaping a new era of seamless interconnection between people, devices, and applications. We are a financially stable and profitable company dedicated to transforming antiquated systems through innovative connectivity solutions.