Junior Customer Success Manager

1global; Lisboa; On-site; EUR 42,000 - 64,000; Full time

Job summary

1GLOBAL is seeking a motivated Customer Success Manager (CSM) to manage and grow relationships with our partner ecosystem. You’ll oversee onboarding, ongoing service delivery, performance reviews, and cross-functional collaboration with Sales, Support, and Product to ensure customers derive maximum value from our telecom services.

The role emphasizes proactive account management, customer advocacy, and delivering measurable outcomes for international clients, with opportunities to advance within

Qualifications

• Knowledge of telecom services, connectivity platforms and partner management.
• Excellent written and verbal communication for both technical and non-technical stakeholders.
• Highly organized with the ability to manage multiple priorities in a fast-paced environment.
• Experience in a customer-facing role within the telecommunications industry is a plus.

Responsibilities

• Own the overall customer relationship and experience across 1GLOBAL services for assigned accounts.

Skills

Telecom knowledge

Relationship management

Communication skills

Organization

Cross-functional collaboration

Problem-solving

Job description

About Us

1GLOBAL is a technology-driven global mobile communications provider helping enterprises and consumer brands deliver seamless connectivity worldwide. Powered by a best-in-class telecom platform, proprietary eSIM technology, and its own mobile core network across 15 countries, 1GLOBAL operates as a fully regulated telecommunications provider in 43 countries.

Founded in 2022, 1GLOBAL has rapidly become one of Europe's fastest-growing telecom technology companies, connecting more than 80 million people and devices globally. Our customers include leading banks, multinational enterprises, global retailers, travel companies, payment service providers, and digital-first businesses.

Headquartered in the Netherlands, with R&D hubs in Lisbon, Berlin, and São Paulo, 1GLOBAL employs over 550 professionals across 16 countries. With annual revenues exceeding US$200 million and a strong track record of profitability, we continue to invest in innovation, infrastructure, and international expansion as we redefine the future of global mobile connectivity.

About the Team

We are looking for a highly motivated and customer-focused Customer Success Manager (CSM) to manage and grow relationships with 1GLOBAL's partners. In this critical role, you’ll be responsible for delivering an exceptional end-to-end customer experience across 1GLOBAL telecom services, from onboarding through to ongoing service delivery and support.

As a CSM, you will work closely with cross-functional teams including Sales, Technical Support, and Product to ensure customers derive maximum value from our solutions. You will also drive service performance reviews, lead service improvement initiatives, and act as a trusted advisor to your accounts.

An opportunity for someone looking to step up, working alongside experienced colleagues, managing smaller accounts initially, and progressing towards strategic account management responsibilities

About the Role

• Own the overall customer relationship and experience across 1GLOBAL services for assigned accounts.
• Lead smooth and professional onboarding processes, ensuring customers are set up for long-term success.
• Manage ongoing service delivery, acting as the key point of contact for service-related queries and escalations.
• Coordinate with internal teams (Support, Network Operations, Sales, Product) to resolve issues and improve customer outcomes.
• Conduct regular Service Reviews and performance reporting, identifying and executing Service Improvement Plans as needed.
• Build strong, long-term relationships that drive retention, growth, and advocacy.
• Monitor usage trends and customer health metrics to identify risks and opportunities for expansion.
• Champion the voice of the customer internally to influence product and process improvements.

About You

Must Have

• Knowledge of telecom services, connectivity platforms, and channel/partner expectations and management.
• Exceptional interpersonal and relationship management skills.
• Excellent written and verbal communication; capable of delivering clear, impactful updates to both technical and non-technical stakeholders.
• Highly organized, detail-oriented, and capable of managing multiple priorities in a fast-paced environment.
• Comfortable leading cross-functional initiatives and influencing without direct authority.
• A proactive problem-solver who thrives in a customer-first culture.

Nice to Have

• Experience in a customer-facing role within the telecommunications industry (Mobile services, eSIM solutions, API integrations, business process, partnership management).

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.