Senior SIM Expert (all)

Personio; United States; Hybrid; USD 80,000 - 125,000; Full time

Benefits offered by this job

Remote work option

Laptop provided

Mobile phone provided

Urban Sports Club

Public transport subsidy

International team environment

Job summary

1NCE in Cologne seeks a Senior SIM Expert to lead SIM/eSIM parametrization, lifecycle ownership and vendor coordination. You will document processes and contribute to SIM/OTA development projects to ensure seamless device-network interaction.

The role requires ~5 years in telecom-related engineering, strong troubleshooting skills with SIM/OTA systems, and a proactive, customer-focused mindset. Hybrid work is available with a modern office in Cologne.

Qualifications

• Educational background in Electrical Engineering, Technical Computer Science, or related field.
• Approximately 5 years of experience in a similar role (Engineering or Roaming).
• Strong administrative and IT abilities with telecom industry background.
• SIM troubleshooting including SIM/Wireshark/network traces, provisioning SIMs, and IMSI changes.
• eSIM Remote SIM provisioning per GSMA SGP 01/02 standards.
• Multi-IMSI applications and related procedures.

Responsibilities

• SIM/eSIM profile management per GSMA/3GPP specs to ensure device-network interaction.
• Oversee the entire SIM lifecycle from requirements to operations.
• Coordinate with SIM/OTA vendors and standardize procedures across partners.
• Document technical processes for consistency and transparency.
• Contribute to development projects connected to SIM/OTA functionality.
• Manage SIM customization, upkeep, and reprogramming for operations.

Skills

SIM troubleshooting

eSIM provisioning

Multi-IMSI

Vendor coordination

OTA systems maintenance

HLR knowledge

Self-starter

Team/customer oriented

Education

Electrical Engineering / Technical Computer Science

Tools

Wireshark

Job description

We are 1NCE

1NCE is a pioneering company at the forefront of reshaping the IoT connectivity landscape. As a key player in the industry, we are on a mission to change the telecoms/IoT landscape. With a focus on innovation, customer satisfaction and industry leadership, 1NCE is ready to change the system.

Your team

Become an important part of 1NCE asSenior SIM Expert (all) and work directly with our entire technical team. We are looking for real “doers” with a positive drive and energy who complement our team in the best possible way and who enjoys mastering challenges and growing together with us. This position is based in Cologneand can be done onsite or hybrid.

Your mission

• SIM/eSIM profile management: Ensure correct parametrization of SIMs in compliance with GSMA and 3GPP specifications to guarantee seamless interaction between SIM, device, and network.

• SIM lifecycle ownership: Oversee the entire SIM lifecycle process, from requirement engineering through to operational management.

• Vendor coordination: Act as the primary interface to SIM and OTA vendors, standardizing SIM-related procedures across all partners.

• Process documentation: Create and maintain clear documentation of technical processes to ensure consistency and transparency.

• Project participation: Contribute to development projects that are connected to or reliant on SIM/OTA functionalities.

• SIM customization and maintenance: Manage SIM customization, ongoing maintenance, and reprogramming to support operational needs.

• Additional responsibilities: Handle handset interaction tracing, AuC security policy, and OTA-related processes.

Your skills

• Educational background: Completed studies in Electrical Engineering, Technical Computer Science, or a related field of education.

• Professional experience: Approximately 5 years of experience in a similar role, such as Engineering or Roaming.

• Technical and administrative skills: Strong administrative and IT abilities with a solid background in the telecom industry.

• SIM troubleshooting expertise: Skilled in SIM card troubleshooting, including the ability to perform SIM, Wireshark, and network traces, provision SIMs, and change IMSIs.

• eSIM provisioning knowledge: Experienced in eSIM Remote SIM provisioning following GSMA SGP 01/02 standards.

• Multi-IMSI familiarity: Proficient in working with multi-IMSI applications and creating or updating related procedures.

• Vendor coordination: Capable of liaising effectively with SIM vendors in collaboration with managers.

• OTA systems maintenance: Experienced in maintaining OTA systems (preferred, though training can be provided if needed).

• HLR knowledge: Able to perform basic checks on an HLR for SIM card provisioning.

• Work approach: Self-starter mentality, proactive, and confident in taking initiative.

• Team and customer orientation: Strong team player with a customer-focused mindset and a confident, competent professional appearance.

Your gains

• 26 Days of paid vacation per Year
• Further professional development - Become part of our international team and an exciting environment that will revolutionise the telecommunications market for IoT
• An exciting environment that will revolutionise the mobile market for IoT with simplicity
• Varied, agile work in a young company with an international team where fun is not neglected
• Short decision-making paths and plenty of room for manoeuvre - with us, you can really get involved and help shape the future
• Trust-based working hours, laptop, mobile phone and the option to work remotely
• Modern office in a central location with drinks, fruit, office snacks, subsidised Urban Sports Club membership and excellent public transport connections

Your contact

Vladimir Kaiser
In case of any additional questions regarding the position: [e-mail]