Lead Java Developer

Job Title : Sr Java Card / eSIM Applet Developer

Location : India Pune

Reports To : Engineering Team Lead

About 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

The Senior eSIM Applet Developer will own the entire lifecycle of eSIM Java applet development — from requirements definition and architecture through coding, testing, certification, and deployment. This role requires deep technical expertise in Java Card , SIM / eSIM environments , and secure 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 applets for SIM, USIM, and eSIM (eUICC) environments.
• Implement, debug, and troubleshoot applet logic on various SIM / eSIM platforms and toolchains.
• Collaborate with OEMs, chipset vendors, and MNOs to integrate and validate applet functionality.
• Ensure compliance with 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 in eSIM technology, secure element design , and Java Card platform updates.

Required Qualifications

Preferred Qualifications

Why Join Us