Lead Java Developer

Job Title: Sr Java Card / eSIM Applet Developer Location:India Pune Reports To:Engineering Team LeadAbout Telna Telna provides Mobile Network Operators (MNOs), Communication Service Providers (CSPs), and Original Equipment Manufacturers (OEMs) with a fully managed global cellular connectivity platform. With access to the largest 2G–5G and LTE-M coverage from over 800 radio network operators—300 of which are direct partners—across 200 countries, Telna empowers seamless, high-performance connectivity worldwide. Our global multi-network connectivity platform simplifies integration, offering localized break-out capabilities via cloud infrastructure. With a single integration into Telna’s platform, millions of devices are powered by resilient, multi-network connectivity—enabling a wide array of innovative cloud-based solutions. Position Overview TheSenior eSIM Applet Developerwill own theentire lifecycleof eSIM Java applet development — from requirements definition and architecture through coding, testing, certification, and deployment. This role requires deep technical expertise inJava Card ,SIM/eSIM environments , andsecure element application development . You will collaborate with product, platform, and QA teams to design, develop, and maintain Telna’s next-generation eSIM applets, ensuring compliance with GSMA, ETSI, and GlobalPlatform standards.Key Responsibilities Own full applet lifecycle:from requirements gathering, design, and development to testing, certification, and release. Develop and maintain Java Card appletsfor SIM, USIM, and eSIM (eUICC) environments. Implement, debug, and troubleshoot appletlogic on various SIM/eSIM platforms and toolchains. Collaborate with OEMs, chipset vendors, and MNOsto integrate and validate applet functionality. Ensure compliancewith GSMA, ETSI, and GlobalPlatform standards for SIM/eSIM applets. Conduct code reviews, test case design, and performance analysis. Work closely with QA to automate testing and validation in both simulated and real device environments. Prepare and maintain technical documentation (design specs, test plans, release notes). Stay current with advancements ineSIM technology, secure element design , andJava Card platform updates. Required Qualifications Bachelor’s or Master’s degree in Computer Science, Electrical Engineering, or related field. 5+ yearsof hands-on experience developingJava Card appletsfor SIM, USIM, or eSIM. Deep understanding of: Java Card 3.x / GlobalPlatform 2.xstandards APDU communication and ISO 7816 Security domains, SCP02/SCP03, and OTA mechanisms Experience withSIM/eSIM development and debugging tools(Gemalto, G&D, Thales, VALID, etc.). Strong knowledge ofGSMA SGP.02 / SGP.22 / SGP.32specifications. Experience deploying and testing applets onUICC/eUICChardware. Proficiency in troubleshooting using logs, traces, and APDU-level analysis. Solid understanding of c ryptography and key managementin secure element contexts. Excellent problem-solving skills and attention to detail. Strong communication and documentation skills. Preferred Qualifications Experience withremote SIM provisioning (RSP)environments. Knowledge ofOTA platformsandbackend integrationwith SIM lifecycle management systems. Familiarity withembedded systemsorsecure hardware modules . Previous work in telecom or IoT connectivity environments . Why Join Us Contribute to the advancement of cutting-edge telecom technologies and infrastructure Collaborate with a diverse, experienced, and multicultural team of engineers and industry professionals Enjoy a flexible work environment with remote work options Receive a competitive salary and comprehensive benefits package Grow your career through professional development opportunities and technical training