Senior Software Engineer - General Backend Development at Appier | Tokyo, Japan

AppierTokyo, Japan

On-site Full-time

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Experience Level

Senior

Qualifications

Minimum qualifications include:- Proven experience in backend development with a robust understanding of scalable system architecture.- Proficiency in programming languages such as Java, Python, or Go.- Strong analytical and problem-solving skills, particularly in performance optimization.- Excellent communication and teamwork abilities, demonstrating a proactive approach to collaborative projects.

About the job

About Appier

Appier is a leading software-as-a-service (SaaS) provider leveraging the power of artificial intelligence (AI) to enhance business decision-making. Established in 2012 with a mission to democratize AI, Appier aims to transform AI into tangible return on investment (ROI) by making software smarter. With a presence in 17 offices across APAC, Europe, and the U. S., Appier is publicly traded on the Tokyo Stock Exchange (Ticker number: 4180). For further insights, visit www.appier.com.

Overseas Candidates Welcome / Visa Support
This role is based in Tokyo, Japan. For international applicants, our Japan office offers visa sponsorship to facilitate a seamless relocation experience.

About the Role

We are on the lookout for a talented and experienced Senior Software Engineer specializing in General Backend Development. In this pivotal role, you will develop and sustain scalable, high-performance backend systems. A significant aspect of your responsibilities will involve diagnosing and resolving complex system performance issues and addressing intricate concurrency challenges, such as race conditions. You will collaborate closely with cross-functional teams to design and implement robust solutions that align with business objectives and guarantee the long-term stability and success of our initiatives.

Key Responsibilities

Design, develop, and maintain durable and scalable backend systems using Java, Python, or Go, along with frameworks like Spring, Undertow, Flask, and FastAPI.
Work alongside cross-disciplinary teams, including frontend developers, product managers, and designers, to define system requirements and deliver high-quality solutions.
Conduct code reviews to ensure compliance with coding standards and best practices.
Identify and troubleshoot issues, while debugging and optimizing code for performance and efficiency.
Engage in the full software development lifecycle, from planning and design through to implementation, testing, and deployment.
Keep abreast of the latest industry trends and technologies, continuously enhancing your skill set.

About You

[Minimum qualifications]

Proven experience in backend development with a strong grasp of scalable system design.
Expertise in programming languages such as Java, Python, or Go.
Strong problem-solving skills with an emphasis on performance optimization.
Excellent collaboration and communication skills, with a proactive approach to teamwork.

About Appier

Appier is at the forefront of the SaaS industry, utilizing AI to revolutionize business decision-making. Our commitment to democratizing AI fosters innovation and growth across various sectors. With a global presence and a dynamic work environment, we empower our employees to thrive and contribute to groundbreaking projects.

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About Appier Appier is a leading software-as-a-service (SaaS) provider leveraging the power of artificial intelligence (AI) to enhance business decision-making. Established in 2012 with a mission to democratize AI, Appier aims to transform AI into tangible return on investment (ROI) by making software smarter. With a presence in 17 offices across APAC, Europe, and the U.S., Appier is publicly traded on the Tokyo Stock Exchange (Ticker number: 4180). For further insights, visit www.appier.com. Overseas Candidates Welcome / Visa SupportThis role is based in Tokyo, Japan. For international applicants, our Japan office offers visa sponsorship to facilitate a seamless relocation experience. About the Role We are on the lookout for a talented and experienced Senior Software Engineer specializing in General Backend Development. In this pivotal role, you will develop and sustain scalable, high-performance backend systems. A significant aspect of your responsibilities will involve diagnosing and resolving complex system performance issues and addressing intricate concurrency challenges, such as race conditions. You will collaborate closely with cross-functional teams to design and implement robust solutions that align with business objectives and guarantee the long-term stability and success of our initiatives. Key Responsibilities Design, develop, and maintain durable and scalable backend systems using Java, Python, or Go, along with frameworks like Spring, Undertow, Flask, and FastAPI. Work alongside cross-disciplinary teams, including frontend developers, product managers, and designers, to define system requirements and deliver high-quality solutions. Conduct code reviews to ensure compliance with coding standards and best practices. Identify and troubleshoot issues, while debugging and optimizing code for performance and efficiency. Engage in the full software development lifecycle, from planning and design through to implementation, testing, and deployment. Keep abreast of the latest industry trends and technologies, continuously enhancing your skill set. About You [Minimum qualifications] Proven experience in backend development with a strong grasp of scalable system design. Expertise in programming languages such as Java, Python, or Go. Strong problem-solving skills with an emphasis on performance optimization. Excellent collaboration and communication skills, with a proactive approach to teamwork.

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Software Engineer, ERP at Tailor | Tokyo

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Senior Software Engineer - C++ Backend Development (Ad Cloud Bidding) in Tokyo

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Full-time|On-site|Tokyo, Japan

About Appier Appier is a pioneering software-as-a-service (SaaS) firm harnessing the power of artificial intelligence (AI) to enhance business decision-making. Established in 2012, our vision centers around making AI accessible to all, with the mission of transforming AI into tangible return on investment (ROI) through intelligent software solutions. With a presence in 17 offices across APAC, Europe, and the U.S., Appier is listed on the Tokyo Stock Exchange (Ticker: 4180). For further details, visit www.appier.com. About the Role Join our Tokyo office as a Senior Software Engineer (Ad Cloud Bidding) and engage in the development of diverse platforms and services that unify data and AI for our clientele. In this role, you will play a critical part in building scalable backend systems, while also being actively involved in service operations, including deployment, monitoring, and incident management, ensuring our distributed services remain reliable and high-performing. Responsibilities Design, implement, and enhance backend services Engage in code reviews and contribute to system architecture discussions Work collaboratively with cross-functional teams to deliver robust and high-performance systems Diagnose production issues and participate in root cause analysis Assist with system deployment, monitoring, and maintenance in live environments Join on-call rotations and lead incident response as necessary About You [Minimum Qualifications] Bachelor's or Master's degree in Computer Science or a related field 3+ years of professional experience in software development Proficiency in modern C++ programming (C++11 or later) Familiarity with Unix/Linux operating systems Strong interpersonal skills, problem-solving abilities, and a sense of ownership [Preferred Qualifications] Solid understanding of system programming principles Experience in developing low-latency (millisecond-scale) and high-throughput systems (over 1K QPS per machine) Expertise in service optimization and performance tuning Familiarity with modern build systems Experience with operational automation tools [Language Requirements] Fluent in English or Chinese. Open to International Applicants/Visa SupportThis position is located in Tokyo, Japan, with visa sponsorship available for overseas candidates.

Nov 7, 2025

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Senior Software Engineer (C++ & Python) at Mujin Inc. | Tokyo

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Full-time|On-site|Tokyo, Japan (MJHQ)

Mujin is at the forefront of industrial robotics with our revolutionary MujinOS, a cutting-edge intelligent operating system. By utilizing real-time digital twins, MujinOS enables the seamless connection and orchestration of equipment, paving the way for fully autonomous operations.At the heart of our innovation is Machine Intelligence (MujinMI), a distinctive methodology that delivers advanced perception, planning, and control algorithms to tackle the most complex automation challenges.Trusted by leading global brands, we are transforming supply chain efficiency. With our headquarters in Japan and expanding teams in China, the US, and Europe, we invite you to join a vibrant workplace where you can impact the future of automation.Team OverviewAs a Senior Software Engineer on Mujin's Warehouse Execution System (WES) & Fleet Management (FM) team, you will be instrumental in designing, developing, and deploying our state-of-the-art warehouse execution and fleet management systems. Our team operates at the intersection of robotics, automation, and software engineering, striving to optimize warehouse operations and ensure the smooth orchestration of robots and industrial machinery.Key Responsibilities- Architect, develop, and sustain robust WES software for effective inventory management, scheduling, and order fulfillment.- Integrate and implement drivers for an array of industrial hardware, including robots, conveyors, 3D cameras, sensors, PLCs, AGVs, ASRS, and WMS.- Engage with real-time operating systems (RTOS) and networking protocols to guarantee system performance and low-latency communication.- Uphold system security by deploying strong encryption and access control protocols.- Design and refine high-performance backend services and APIs for smooth integration with third-party warehouse software.- Develop scalable HTTP servers to support extensive warehouse operations.- Collaborate closely with backend and frontend teams to enhance system usability and user experience.- Maintain code quality and testing frameworks to ensure system reliability.- Occasionally visit client sites, both locally and internationally, for deployment and support.- Address complex technical challenges in a dynamic environment.- Undertake additional tasks as necessary to support team objectives.

Mar 10, 2025

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