Suggested rewrite: Led a cross-functional initiative that improved [business outcome] by [measurable result], demonstrating experience relevant to this role...
Junior Customer Success Manager (API)
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- Remote from
- Japan
- Salary
- Undisclosed
- Department
- Customer Support & Success
- Employment
- Full Time
- Experience
- Entry-Level, Junior
- Published
- Apply before
- 10 Nov 2026
- Listing views
- 152
- Application actions
- 11
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The role, at a glance.
Vonage is seeking a junior Customer Success Manager to help API customers adopt and optimize cloud communications solutions. The role centers on stakeholder relationship management, success planning, usage analysis, training, issue coordination, renewals, and expansion opportunities. The successful candidate will be fluent in English and Japanese and should be comfortable discussing APIs, cloud communications, and software integrations. This remote Japan-based role requires proactive cross-functional collaboration with product, engineering, sales, and support teams to improve customer outcomes and retention.
Role DNA
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Pace & Pressure
4/5Autonomy Level
4/5Communication Load
5/5Salary analysis
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Core skills
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Sample interview questions
I would begin by learning the customer's business goals, use case, stakeholders, implementation timeline, and success metrics. I would then document milestones for integration, adoption, and measurable outcomes, assign owners on both sides, and schedule regular reviews to address risks and demonstrate progress.
I would review usage data for trends, feature utilization, error patterns, and changes in volume, then compare those findings with the customer's original goals. I would validate the insight with the customer and recommend targeted training, technical guidance, or relevant API capabilities that can improve their outcome.
I would acknowledge the impact promptly, gather clear technical details and business context, and coordinate with support and engineering using an agreed escalation path. I would provide regular updates, manage expectations transparently, and follow up after resolution to confirm the customer is successful and identify preventive actions.
I would accurately communicate customer needs, evidence, and business impact to internal teams while respecting product strategy and available resources. When a request cannot be fulfilled immediately, I would explain the rationale clearly, offer alternatives, and keep the customer informed of next steps.
I would use both languages to communicate clearly with customers and internal stakeholders, adapt documentation and training to the audience, and reduce ambiguity during technical or strategic discussions. This would help build trust and ensure customer feedback is represented accurately across teams.
About this role.
Join Vonage and help us innovate cloud communications for businesses worldwide!
About Vonage API
Vonage API is a global leader in Communications Platform as a Service (CPaaS), enabling businesses to seamlessly integrate messaging, voice, video, and authentication capabilities into their applications. Our mission is to power meaningful conversations and connections through innovative cloud communications solutions.
Why this role matters:
As a Customer Success Manager (CSM) at Vonage API, you will play a critical role in ensuring our customers achieve their business objectives through our API solutions. You will be responsible for driving adoption of our communication APIs, fostering strong customer relationships, and ensuring long-term customer satisfaction and retention. This role requires a proactive, customer-centric approach with a strong understanding of CPaaS solutions and how they deliver value to businesses.
Your key responsibilities:
- Relationship Management: Build and maintain strong relationships with key stakeholders, acting as a trusted advisor and strategic partner.
- Customer Advocacy & Success Planning: Understand customer goals, develop success plans, and align API solutions to drive business value.
- Product Adoption & Optimization: Monitor usage patterns, identify opportunities for expansion, and provide best practices to maximize API adoption.
- Proactive Engagement & Issue Resolution: Act as the voice of the customer within Vonage, collaborating with support, product, and engineering teams to address challenges and improve the customer experience.
- Renewals & Expansion: Identify upsell and cross-sell opportunities to drive revenue growth and customer retention.
- Training & Enablement: Provide ongoing education and resources to ensure customers are leveraging the full potential of Vonage API solutions.
- Feedback & Insights: Collect and relay customer feedback to internal teams to influence product improvements and roadmap priorities.
What you’ll bring
- Fluent English and Japanese is a must
- Experience: any experience in Customer Success, Account Management, or a similar customer-facing role within a SaaS, CPaaS, or technology-driven company is an advantage
- Technical Acumen: Familiarity with APIs, cloud communications, and software integration processes.
- Customer-Centric Mindset: A strong passion for customer success and the ability to foster meaningful relationships.
- Communication & Problem-Solving: Excellent verbal and written communication skills with a strategic problem-solving approach.
- Collaboration: Ability to work cross-functionally with product, sales, and support teams to drive customer success.
- Data-Driven Approach: Comfortable analyzing customer usage data to identify trends and opportunities.
- Adaptability & Proactiveness: Ability to thrive in a fast-paced environment and proactively address customer needs.
Why Join Vonage API?
- Be part of a cutting-edge technology company driving digital transformation.
- Work with a talented and passionate team dedicated to customer success.
- Opportunity to make a significant impact on customer experiences and business growth.
- Competitive salary, benefits, and career growth opportunities.
How you’ll benefit:
- Medical Insurance
- Group Life Insurance
- Unlimited Discretionary Time Off
- Three Paid Volunteer Days a Year
Join us in shaping the future of cloud communications! Apply today to become a Customer Success Manager at Vonage API.#LI
#LI-MW1
There’s no perfect candidate. You don’t need all the preferred qualifications to make a valuable impact on our team. Our employees and customers come from diverse backgrounds, so if you’re passionate about what you could achieve at Vonage, we’d love to hear from you.
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Who we are:
Vonage is a global cloud communications leader. And your talent will further help brands – such as Airbnb, Viber, WhatsApp, and Snapchat – accelerate their digital transformation through our fully programmable-based unified communications, contact center solutions, and communications APIs. Ready to innovate? Then join us today.
Note: The purpose of this profile is to provide a general summary of essential responsibilities for the position and is not meant as an exhaustive list. Assignments may differ for individuals within the same role based on business conditions, departmental need or geographic location.
Annual salary information is not provided for this position. Explore salary ranges for similar roles in our Salary Directory ›
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