Join the KOMOJU Tech Talent Community | Ruby Kaigi 2026

Advance Your Career with KOMOJUAt KOMOJU, we are continually on the lookout for skilled engineers eager to transform the fintech landscape.By becoming part of our Tech Talent Community, you will have the opportunity to showcase your profile directly to our Engineering team.

About KOMOJUKOMOJU stands as the premier cross-border payment gateway in Japan, empowering companies such as the video game distribution platform Steam and the widely-used mobile app TikTok. We serve thousands of merchants by providing the essential payment infrastructure they require, through developer-friendly APIs and integrations with popular platforms like Shopify and Wix, enabling our merchants to thrive in expanding markets.What You Can ExpectAt KOMOJU, we maintain a product-focused approach, which means your contributions will directly impact our payment gateway and various projects geared towards shaping the future of KOMOJU. You'll collaborate with fellow engineers in a flat, inclusive environment where every engineer has a voice in critical product and technology decisions. Our self-organizing culture empowers engineers to take ownership of their work, play to their strengths, and explore areas for growth within the team, ensuring you are the primary driver of your career development.International at Our CoreOur engineering team is predominantly comprised of members from outside Japan, with English as the primary language of communication. Many team members are bilingual, reflecting our commitment to diversity and seamless collaboration across teams. To foster this culture, we offer all employees the option of taking English or Japanese lessons.About the PositionWe are on the lookout for a talented backend engineer to enhance our platform, enabling it to manage payments on a global scale. Your main focus will be on Ruby, primarily working with Ruby on Rails (90% of tasks). Given that we are still expanding our front-end team, you may occasionally be asked to engage in front-end tasks (less than 5% of tasks). Additionally, you will handle tasks related to Monitoring and Observability using Terraform and DataDog (less than 5%).Your typical responsibilities will involve adding new APIs for front-end interfaces within our Ruby on Rails application, troubleshooting payment issues in collaboration with partners, and enhancing the reliability and observability of our systems through Terraform to ensure optimal performance. You will work closely with product managers to critically assess requirements and translate them into effective code. Collaborating with your peers, you will also provide constructive feedback during code reviews, seek refactoring opportunities, and contribute to the improvement of our codebase. Mentorship from managers and senior developers will be available to facilitate your skill development, as we prioritize realizing your growth potential.

About KOMOJUKOMOJU offers a comprehensive payment solution adopted by major platforms like the global gaming giant Steam and the e-commerce platform Shopify. Our intuitive and unified API allows seamless integration, enabling various payment methods such as credit cards, convenience store payments, electronic money, bank transfers, and Pay-easy transactions. As we expand, KOMOJU will continue to collaborate closely with numerous financial institutions, payment networks, banks, and wallets, allowing customers to choose from multiple countries, currencies, and local payment options, ensuring efficient and swift transaction processing.Position OverviewOur sales team currently focuses on building relationships with enterprise clients and managing existing customer accounts. We aim to reinforce our structure to emphasize acquiring new customers.In this role, you will take over account management of existing clients, strengthening long-term relationships and driving revenue growth through upselling and cross-selling. Additionally, you will systematize client interactions that have been traditionally ad-hoc, creating a replicable standard process to alleviate the burden on the sales team when dealing with existing customers, thus enhancing organizational productivity. Eventually, you will lead the establishment of the Customer Success team, playing a pivotal role in maximizing customer satisfaction and Gross Merchandise Volume (GMV).Key ResponsibilitiesOwnership of Enterprise ClientsAs the primary contact for 10-20 enterprise clients, you will fully inherit responsibilities from the sales team, taking ownership to build and maintain long-term relationships. You will lead and improve inquiry response processes and resolve technical challenges in collaboration with Customer Engineering, acting as a strategic partner to support client business growth.Regular Business ReviewsYou will plan and conduct monthly and quarterly business reviews. Analyze GMV trends and payment performance (approval rates, error rates, etc.) through data analysis and provide actionable improvement suggestions for client business growth.Driving Upsell StrategiesBased on clients' business plans and payment data, you will identify opportunities for introducing new payment methods or utilizing new features. As an advisor on payment strategies, you will drive proposals and negotiations to achieve mutual growth for clients and KOMOJU.Churn Risk ManagementUsing data, you will visualize risk clients, detecting risk signals such as GMV decrease or engagement drop early. You will proactively take actions to enhance satisfaction and maximize continued usage.Building Operational ProcessesAs KOMOJU's first dedicated Account Manager, you will design and systematize touch models by segment, business review frameworks, and playbooks to prevent churn and facilitate expansion. This role is critical in establishing a replicable operational foundation, anticipating future CSM organization growth.RequirementsEssential QualificationsExperience in sales, account management, customer success, or IT consulting targeting enterprise clients.Proven track record of accountability towards numerical targets such as revenue, GMV, and contract renewal rates.Experience identifying issues based on data analysis and driving proposals to execution.Able to build and strengthen relationships with existing clients, driving revenue growth through upselling and cross-selling initiatives.Possess a high level of ownership and the ability to act autonomously, delivering results in a fast-paced environment, including cross-departmental and remote settings.Business-level proficiency in English.Preferred QualificationsExperience in the SaaS, fintech, or payments industry.Experience as an Account Manager or Customer Success Manager for technical products.Experience in startups, particularly in establishing operations from scratch.Tools Utilized DailyCRM tools (e.g., Salesforce, Hubspot) for managing projects and client relationships.Internal communication tools like Slack, Notion, and Google Workspace.Document creation with Google Slides and other Google Workspace tools.BI tools like Looker and Power BI.SQL for database referencing.BenefitsHybrid work model allowing both remote and in-office work.Full social insurance coverage (affiliated with Kanto IT Software Health Insurance Association).Discounts for sports clubs (Kanto IT Health Insurance).Access to recreational facilities (Kanto IT Health Insurance).Health check-ups.Language training.Support for self-learning.Leave policies accommodating diverse lifestyles.

About KOMOJUKOMOJU is a pioneering global payment company originating from Japan, which offers an all-in-one payment service utilized by some of the world's largest platforms such as Steam and Shopify. Our intuitive and unified API enables businesses to seamlessly integrate various payment methods including credit cards, convenience store payments, electronic money, bank transfers, and more. As we continue to expand our reach globally, we are committed to strengthening our partnerships with financial institutions, payment networks, banks, and local wallets to facilitate secure and efficient transactions across multiple countries and currencies.Role OverviewAs we focus on expanding our operations in Europe and Latin America, we recognize the urgent need to enhance our customer support system. We are looking to welcome new team members who can strengthen our customer support department and contribute to our growth strategy.Key ResponsibilitiesIn this position, you will primarily focus on customer support within our payment services. While this role starts in customer support, there is a clear career path to customer success (CS) anticipated in the future. We welcome candidates who are eager to grow and take on more strategic roles over time.Respond to inquiries related to our servicesEnhance customer service delivery in line with our corporate strategyImprove service delivery processesCollaborate with partner companiesOur inquiries come from both retail partners and end users, and you will utilize multiple internal systems to assist them. With a diverse team including many international members, this role also offers opportunities to leverage language skills.

About KOMOJUKOMOJU (コモジュ) is a comprehensive payment service that powers some of the world's largest gaming platforms like Steam and e-commerce platforms such as Shopify. By providing an intuitive, cohesive API, KOMOJU enables the use of multiple payment methods including credit cards, convenience store payments, various electronic money options, bank transfers, and Pay-easy. Looking forward, KOMOJU aims to enhance its services through partnerships with a variety of financial institutions, payment networks, banks, and wallets to offer diverse payment options across various countries, regions, currencies, and local methods. Currently, Japan and South Korea are our primary markets, and we are accelerating our expansion into Europe and other global markets.Key ResponsibilitiesAs an Operations Specialist at our company, you will primarily handle transaction data reconciliation and management, along with setting up payment activation for our merchants. You will also actively collaborate with other teams to improve operational efficiency and service quality.Creation of invoices and management of payment/receipts within the Payment System DivisionUtilization of internal systems for payment/receipt management, including data registration and updatesCommunication with partners (domestic and international) and various administrative tasks

About KOMOJUKOMOJU stands at the forefront of Japan's cross-border payment solutions, enabling seamless transactions for esteemed global brands such as Steam and TikTok. Our innovative platform empowers a multitude of merchants to establish their presence in Japan and across Asia, leveraging our developer-centric APIs and plugins for platforms like Shopify and Wix.The RoleWe are in search of a dynamic Customer Success Manager who is not only commercially astute but also passionate about cultivating robust client relationships, maximizing account potential, and identifying new business avenues within our expanding merchant network. As a crucial contributor to our revenue growth, you will focus on upselling and cross-selling while ensuring our customers achieve success on the KOMOJU platform.This position is ideal for an individual who enjoys a blend of customer care and sales in a fast-paced, international context.Why You Should Join UsSales-Driven Customer Success: Your role will focus on expanding your portfolio, not just maintaining it.Global Team Environment: Collaborate in a bilingual, international setting that values flexibility and autonomy.Impactful Product: Play a vital role in supporting merchants’ global expansion through our cutting-edge technology.Your ResponsibilitiesOversee a diverse portfolio of merchant accounts, serving as their trusted KOMOJU liaison.Identify and pursue growth opportunities through upselling and cross-selling of new features, products, and services.Act as a strategic partner, aligning merchant goals with KOMOJU's offerings.Conduct regular account reviews to provide performance insights and support further expansion.Collaborate with Sales & Marketing, Product, Support, and Engineering to enhance customer experience and deliver effective solutions.Participate in initiatives aimed at driving feature adoption and revenue growth.Maintain comprehensive records in our CRM, including product utilization, opportunities, and customer feedback.