Backend Engineer, Platform

Backend Engineer, Platform 仕事概要 KabuK Style is building the next generation infrastructure for the global travel industry. Our flagship product, HafH, already connects over 30,000 accommodations across 130+ countries and serves a rapidly growing international customer base. As we scale, we are developing a new B2B platform that powers travel distribution, supplier integrations, pricing optimization, and booking infrastructure for partners around the world. ------------------------------------------- KabuK Style is building KabuK Exchange, also known as KBKx, a B2B2B travel distribution platform designed to connect Japanese hotel supply with global demand channels, while also supporting redistribution of wholesaler inventory across multiple travel products. The platform will support hotels, travel suppliers, channel managers, distributors, internal products, and future white-label services. Our goal is to build reliable travel distribution infrastructure that can scale across Japan, Asia, and global demand markets. ------------------------------------------- We are looking for a Backend Engineer, Platform to help build and maintain the backend services that power KabuK Exchange. This role is ideal for an engineer who has solid backend development experience and wants to grow by working on real platform systems, APIs, integrations, pricing, billing, payments, booking workflows, and travel distribution infrastructure. You will work closely with senior backend engineers, engineering leads, product managers, QA, and external development partners. You will contribute to production services while learning how to design reliable, maintainable, and scalable backend systems in a complex B2B2B travel platform. ------------------------------------------- This role may work across one of the following platform areas depending on business needs and candidate strengths: ▼Supply & Distribution Platform This team owns the systems that connect hotel supply to demand channels reliably, accurately, and at scale. The team’s scope includes: - Supplier integrations - Channel manager integrations - Distributor APIs - PMS/extranet distribution controls - Availability and rate ingestion - Rate and availability normalization - Booking and reservation operational lifecycle - Partner API contracts - Distribution eligibility rules - Hotel onboarding technical flows ▼Commerce Platform This team owns the systems that ensure every price, booking, payment, invoice, and ledger event is commercially correct and auditable. The team’s scope includes: - Pricing Service - Billing - Payments - Ledger - Reconciliation - Supplier payables - Distributor receivables - Refunds and adjustments - Credit limits - Commercial reporting inputs - Financial auditability ------------------------------------------- Depending on team assignment, you may contribute to backend services related to: - Internal APIs and service-to-service communication - Supplier and partner integrations - Booking and reservation workflows - Pricing and margin calculation workflows - Billing and payment workflows - Invoice and reconciliation support - PMS and extranet backend functionality - Data mapping and API normalization - Error handling, retries, and monitoring - Backend testing and production issue investigation - Operational tools for internal teams You will help improve the reliability, maintainability, and scalability of platform services as KabuK Exchange moves from MVP toward external launch and growth. ------------------------------------------- - Build, maintain, and improve backend services for the KabuK Exchange platform. - Develop and maintain APIs used by internal services, frontend applications, and external partners. - Implement features based on product requirements and technical designs. - Work with senior engineers to understand system architecture, service boundaries, and data models. - Debug backend issues across APIs, databases, integrations, and platform workflows. - Write clean, maintainable, and testable code. - Participate in code reviews and improve based on feedback. - Collaborate with QA to verify backend behavior and resolve defects. - Help improve logging, monitoring, error handling, and operational reliability. - Document technical behavior, API changes, and implementation details when needed. - Support production readiness as the platform scales. ------------------------------------------- In this role, success means you are able to: - Deliver backend features with good quality and reliability. - Understand business requirements and translate them into working backend functionality. - Contribute to APIs, services, integrations, and data workflows with increasing independence. - Work effectively with senior engineers and product stakeholders. - Identify edge cases, defects, and operational risks early. - Improve your technical judgment and grow toward senior-level ownership over time. ------------------------------------------- This is an opportunity to join KabuK Exchange at an important stage of its development. You will work on real platform systems that support hotel supply, distribution channels, pricing, booking, billing, payments, and operational workflows. You will gain experience across travel technology, platform engineering, API design, integrations, and commercial backend systems while working with senior engineers and product leaders. If you want to grow as a backend engineer while contributing to a platform with meaningful business impact, this role offers a strong opportunity to build, learn, and take on increasing ownership. 必須スキル KabuK Style is building the next generation infrastructure for the global travel industry. Our flagship product, HafH, already connects over 30,000 accommodations across 130+ countries and serves a rapidly growing international customer base. As we scale, we are developing a new B2B platform that powers travel distribution, supplier integrations, pricing optimization, and booking infrastructure for partners around the world. ------------------------------------------- KabuK Style is building KabuK Exchange, also known as KBKx, a B2B2B travel distribution platform designed to connect Japanese hotel supply with global demand channels, while also supporting redistribution of wholesaler inventory across multiple travel products. The platform will support hotels, travel suppliers, channel managers, distributors, internal products, and future white-label services. Our goal is to build reliable travel distribution infrastructure that can scale across Japan, Asia, and global demand markets. ------------------------------------------- We are looking for a Backend Engineer, Platform to help build and maintain the backend services that power KabuK Exchange. This role is ideal for an engineer who has solid backend development experience and wants to grow by working on real platform systems, APIs, integrations, pricing, billing, payments, booking workflows, and travel distribution infrastructure. You will work closely with senior backend engineers, engineering leads, product managers, QA, and external development partners. You will contribute to production services while learning how to design reliable, maintainable, and scalable backend systems in a complex B2B2B travel platform. ------------------------------------------- This role may work across one of the following platform areas depending on business needs and candidate strengths: ▼Supply & Distribution Platform This team owns the systems that connect hotel supply to demand channels reliably, accurately, and at scale. The team’s scope includes: - Supplier integrations - Channel manager integrations - Distributor APIs - PMS/extranet distribution controls - Availability and rate ingestion - Rate and availability normalization - Booking and reservation operational lifecycle - Partner API contracts - Distribution eligibility rules - Hotel onboarding technical flows ▼Commerce Platform This team owns the systems that ensure every price, booking, payment, invoice, and ledger event is commercially correct and auditable. The team’s scope includes: - Pricing Service - Billing - Payments - Ledger - Reconciliation - Supplier payables - Distributor receivables - Refunds and adjustments - Credit limits - Commercial reporting inputs - Financial auditability ------------------------------------------- Depending on team assignment, you may contribute to backend services related to: - Internal APIs and service-to-service communication - Supplier and partner integrations - Booking and reservation workflows - Pricing and margin calculation workflows - Billing and payment workflows - Invoice and reconciliation support - PMS and extranet backend functionality - Data mapping and API normalization - Error handling, retries, and monitoring - Backend testing and production issue investigation - Operational tools for internal teams You will help improve the reliability, maintainability, and scalability of platform services as KabuK Exchange moves from MVP toward external launch and growth. ------------------------------------------- - Build, maintain, and improve backend services for the KabuK Exchange platform. - Develop and maintain APIs used by internal services, frontend applications, and external partners. - Implement features based on product requirements and technical designs. - Work with senior engineers to understand system architecture, service boundaries, and data models. - Debug backend issues across APIs, databases, integrations, and platform workflows. - Write clean, maintainable, and testable code. - Participate in code reviews and improve based on feedback. - Collaborate with QA to verify backend behavior and resolve defects. - Help improve logging, monitoring, error handling, and operational reliability. - Document technical behavior, API changes, and implementation details when needed. - Support production readiness as the platform scales. ------------------------------------------- In this role, success means you are able to: - Deliver backend features with good quality and reliability. - Understand business requirements and translate them into working backend functionality. - Contribute to APIs, services, integrations, and data workflows with increasing independence. - Work effectively with senior engineers and product stakeholders. - Identify edge cases, defects, and operational risks early. - Improve your technical judgment and grow toward senior-level ownership over time. ------------------------------------------- This is an opportunity to join KabuK Exchange at an important stage of its development. You will work on real platform systems that support hotel supply, distribution channels, pricing, booking, billing, payments, and operational workflows. You will gain experience across travel technology, platform engineering, API design, integrations, and commercial backend systems while working with senior engineers and product leaders. If you want to grow as a backend engineer while contributing to a platform with meaningful business impact, this role offers a strong opportunity to build, learn, and take on increasing ownership. 歓迎スキル - Experience with Go, Java, Kotlin, or other modern backend languages. - Experience with AWS or cloud-based systems. - Experience with third-party API integrations. - Experience with event-driven processing, queues, retries, or asynchronous workflows. - Experience in travel, hospitality, OTA, hotel systems, channel managers, payments, marketplaces, or B2B platforms. - Experience working with outsourced or distributed engineering teams. - Japanese or Korean language ability. 求める人物像 応募概要 給与 Compensation varies based on skills and experience 勤務地 This is a remote role, but we are ideally looking for candidates based in Japan. Preferred locations in Japan: - Osaka - Fukuoka - Tokyo Candidates based elsewhere in Japan are also welcome to apply. Candidates based in Korea are also acceptable, with Seoul being the preferred location. The role will work closely with teams in Japan, so candidates should be comfortable working across Japan/Korea time zones and collaborating with both internal and external engineering teams. For candidates based in Japan or Korea, local employment arrangements may be available depending on location and individual circumstances. 雇用形態 Fixed-term contract employee or Outsourcing contract / Final decision will be made based on mutual agreement. 勤務体系 Fully Flex 試用期間 Contract employee : 6 months, Outsourcing contract : 4 months 福利厚生 Contract employee : Social insurance (Health insurance, welfare pension, work Injury insurance, and unemployment Insurance)