Senior Java Software Engineer

Global ConnectivityStay connected in 190+ countries with one provider and one contract. For IoT devices For Employees Embedded Telco & APIFully embedded and ready to distribute eSIMs, personalised to your brand. SIM ServersSoftware for SIM and eSIM profile, lifecycle and entitlement management. Consumer RSP - SM-DP+ (SGP.22) eSIM IoT Manager - eIM (SGP.32) Entitlement Server Compliance & Mobile RecordingMobile recording for trade and financial regulatory compliance. All products> Global EnterprisesScalable mobile connectivity solutions with secure cost-effective roaming. Financial InstitutionsStay compliant and connected with our financial regulatory solutions. IoTEasily managed scalable connectivity with our global network. Mobile OperatorsThe technological advantage to grow your network. Tech & TravelOffer our global data roaming services under your own brand. RetailersSafeRetail POS Connectivity for iOS devices All use cases> PressReleases, publication and media resources. WhitepapersIn-depth studies by our experts into pivotal industry topics. CareersDiscover our latest career opportunities. EventsMeet us at events around the world SupportAssistance from our 24x7 support team. BlogOur knowledge base for our products, services and the company. Case studiesExplore real customer success stories and outcomes. About us> Partnerships Contact sales Senior Java Software Engineer Technology Berlin, Germany Full-time About Us 1GLOBAL is a technology-driven global mobile communications provider, delivering global connectivity solutions to enterprises and consumers. Powered by a best-in-class telecom platform with its own owned and operated global mobile core network in 15 countries, fully fledged in-house developed eSIM technology, and an extensive portfolio of telecom licenses; 1GLOBAL operates as a fully regulated telecommunications provider across 43 countries worldwide. The company serves many of the world’s leading banks, multinational enterprises, global retailers and digital-first businesses, including neo-banks, global fast moving consumer goods companies, travel leaders, and payment service providers. Today, 1GLOBAL connects more than 80 million people and devices globally, enabling our customers to launch, scale, and innovate with confidence in the mobile ecosystem. 1GLOBAL is a profitable, fast-growing business. With full-year revenues in 2025 exceeding US$200 million and profits of over US$25 million, we generate strong cash flows to fund our growth allowing us to continuously invest in infrastructure, platform innovation, and global expansion. In 2026 also the parent of the Lidl Group acquired a 10% interest in 1GLOBAL as part of a deal for Lidl to offer globally to its 180 million consumers communication services. Recent years have marked a defining phase in 1GLOBAL’s journey, with major enterprise and mass-consumer client wins accelerating its evolution into a global mobile connectivity powerhouse, purpose-built to enable consumer brands to enter and succeed with their own aspirations to offer telecommunications services to their clients. Founded in 2022 by experienced technology entrepreneurs, Hakan Koç and Pyrros Koussios, 1GLOBAL has rapidly emerged as a European technology leader shaping the future of global telecommunications. It operates as a fully regulated Mobile Virtual Network Operator (MVNO) in 15 countries and as a regulated telecom operator in an additional 28 markets. Headquartered in the Netherlands, with world-class R&D hubs in Lisbon, Berlin, and São Paulo, its team of close to 550 experts across 16 countries is united by a single ambition: to redefine global mobile connectivity through technology, scale, and execution excellence. About The Team We are looking for a talented engineer to join our Consumer Group. You will join a development team responsible for the product delivery and in-life management of our B2C (betterroaming) and B2B2C (API powering Revolut, nordVPN, etc.) products. The talented team is eager to learn and experiment with new technologies. We value teamwork and embrace a culture of fully owning our deliverables, meaning we are both autonomous and accountable for them. About The Role Build high-impact features and contribute to the architecture design; aim towards resiliency, scalability, security and fault tolerance;Advocate for high code quality, readability and high tests coverage;Promote best practices for a high-scale web (or mobile) environment;Work with an Agile methodology;Identify areas of improvement in the codebase and promote them through seamless integrations, documenting solutions and new flows;Mentor junior members when needed and contribute with meaningful reviews. Requirements About You 5+ years of experience in Java software development;Experience with unit/integration/e2e testing (test-driven development is a plus);Proficiency with REST APIs, both in implementing and consuming the interfaces;Experience with development tools and processes (Git-flow, peer reviewing);Familiarity with relational databases, CI/CD flows, Git, Docker, and Kubernetes;Good understanding of cloud services and scalable infrastructure;Excellent communication skills (fluent in English, both written and spoken), with a self-motivated and autonomous mindset. Benefits Why 1GLOBAL? Growth Opportunities: Advance your career in one of the fastest growing telecommunications companies, expanding over 50% year-on-year under the leadership of successful tech entrepreneurs.Major Transaction Exposure: Be in the driver’s seat for transactions that will have an impact on the future telco industry.Work with a Talented Team: From the Board and the Founders to the Senior Management Team, you will collaborate daily with the most capable and renowned external advisors and constantly being exposed to talented and driven individuals.Dynamic Work Environment: Thrive in a collaborative, fast-paced workplace where innovation is encouraged, and every contribution counts.Professional Development: Work alongside industry experts to enhance your skills and knowledge in a cutting-edge field.International Experience: Gain opportunities to work in different 1GLOBAL offices around the world as you grow within the company.Open Communication Culture: Join a team where your ideas are heard, and open dialogue is encouraged, fostering a supportive and transparent work environment.Get Things Done Attitude: Be part of a results-driven team that values efficiency, creativity, and the drive to make a tangible impact in the industry. 1GLOBAL is an equal opportunity employer, we value your character as much as your talent. Diversity drives our innovation, and we offer a collaborative, dynamic, and international work environment. We are excited for you to join our mission to revolutionise connectivity globally. Apply now Products Global Connectivity IoT Connectivity Enterprise Connectivity Embedded Telco & API Remote SIM Provisioning M2M RSP Consumer RSP Entitlement Server Compliance & Recording Use Cases Global Enterprises IoT Mobile Operators Financial Institutions Tech & Travel Company Partnerships Whitepapers Press Careers Blog Support All Legal Privacy Policy Terms & Conditions Accessibility Statement Complaints Code Imprint Social media Learn more with AI 1GLOBAL is a trading name of 1GLOBAL Holdings B.V. Senior Java Software Engineer Technology Berlin, Germany Full-time About The Team We are looking for a talented engineer to join our Consumer Group. You will join a development team responsible for the product delivery and in-life management of our B2C (betterroaming) and B2B2C (API powering Revolut, nordVPN, etc.) products. The talented team is eager to learn and experiment with new technologies. We value teamwork and embrace a culture of fully owning our deliverables, meaning we are both autonomous and accountable for them. About The Role Build high-impact features and contribute to the architecture design; aim towards resiliency, scalability, security and fault tolerance;Advocate for high code quality, readability and high tests coverage;Promote best practices for a high-scale web (or mobile) environment;Work with an Agile methodology;Identify areas of improvement in the codebase and promote them through seamless integrations, documenting solutions and new flows;Mentor junior members when needed and contribute with meaningful reviews. About You 5+ years of experience in Java software development;Experience with unit/integration/e2e testing (test-driven development is a plus);Proficiency with REST APIs, both in implementing and consuming the interfaces;Experience with development tools and processes (Git-flow, peer reviewing);Familiarity with relational databases, CI/CD flows, Git, Docker, and Kubernetes;Good understanding of cloud services and scalable infrastructure;Excellent communication skills (fluent in English, both written and spoken), with a self-motivated and autonomous mindset. Benefits Why 1GLOBAL? Growth Opportunities: Advance your career in one of the fastest growing telecommunications companies, expanding over 50% year-on-year under the leadership of successful tech entrepreneurs.Major Transaction Exposure: Be in the driver’s seat for transactions that will have an impact on the future telco industry.Work with a Talented Team: From the Board and the Founders to the Senior Management Team, you will collaborate daily with the most capable and renowned external advisors and constantly being exposed to talented and driven individuals.Dynamic Work Environment: Thrive in a collaborative, fast-paced workplace where innovation is encouraged, and every contribution counts.Professional Development: Work alongside industry experts to enhance your skills and knowledge in a cutting-edge field.International Experience: Gain opportunities to work in different 1GLOBAL offices around the world as you grow within the company.Open Communication Culture: Join a team where your ideas are heard, and open dialogue is encouraged, fostering a supportive and transparent work environment.Get Things Done Attitude: Be part of a results-driven team that values efficiency, creativity, and the drive to make a tangible impact in the industry. 1GLOBAL is an equal opportunity employer, we value your character as much as your talent. Diversity drives our innovation, and we offer a collaborative, dynamic, and international work environment. We are excited for you to join our mission to revolutionise connectivity globally. Apply now About The Team We are looking for a talented engineer to join our Consumer Group. You will join a development team responsible for the product delivery and in-life management of our B2C (betterroaming) and B2B2C (API powering Revolut, nordVPN, etc.) products. The talented team is eager to learn and experiment with new technologies. We value teamwork and embrace a culture of fully owning our deliverables, meaning we are both autonomous and accountable for them. About The Role Build high-impact features and contribute to the architecture design; aim towards resiliency, scalability, security and fault tolerance;Advocate for high code quality, readability and high tests coverage;Promote best practices for a high-scale web (or mobile) environment;Work with an Agile methodology;Identify areas of improvement in the codebase and promote them through seamless integrations, documenting solutions and new flows;Mentor junior members when needed and contribute with meaningful reviews. About You 5+ years of experience in Java software development;Experience with unit/integration/e2e testing (test-driven development is a plus);Proficiency with REST APIs, both in implementing and consuming the interfaces;Experience with development tools and processes (Git-flow, peer reviewing);Familiarity with relational databases, CI/CD flows, Git, Docker, and Kubernetes;Good understanding of cloud services and scalable infrastructure;Excellent communication skills (fluent in English, both written and spoken), with a self-motivated and autonomous mindset. Benefits Why 1GLOBAL? Growth Opportunities: Advance your career in one of the fastest growing telecommunications companies, expanding over 50% year-on-year under the leadership of successful tech entrepreneurs.Major Transaction Exposure: Be in the driver’s seat for transactions that will have an impact on the future telco industry.Work with a Talented Team: From the Board and the Founders to the Senior Management Team, you will collaborate daily with the most capable and renowned external advisors and constantly being exposed to talented and driven individuals.Dynamic Work Environment: Thrive in a collaborative, fast-paced workplace where innovation is encouraged, and every contribution counts.Professional Development: Work alongside industry experts to enhance your skills and knowledge in a cutting-edge field.International Experience: Gain opportunities to work in different 1GLOBAL offices around the world as you grow within the company.Open Communication Culture: Join a team where your ideas are heard, and open dialogue is encouraged, fostering a supportive and transparent work environment.Get Things Done Attitude: Be part of a results-driven team that values efficiency, creativity, and the drive to make a tangible impact in the industry. 1GLOBAL is an equal opportunity employer, we value your character as much as your talent. Diversity drives our innovation, and we offer a collaborative, dynamic, and international work environment. We are excited for you to join our mission to revolutionise connectivity globally.