Software Engineer, General Backend Development, Enterprise Solution - Tokyo,Japan

About Appier Appier is an AI-native Agentic AI as a Service (AaaS) company that uses artificial intelligence (AI) to power business decision-making. Founded in 2012 with a vision of democratizing AI, Appier’s mission is turning AI into ROI by making software intelligent. Appier now has 17 offices across APAC, Europe and U.S., and is listed on the Tokyo Stock Exchange (Ticker number: 4180). Visit www.appier.com for more information. Open to overseas candidates/Visa Support This position is based in Tokyo, Japan. For international candidates, Appier's Japan office provides visa sponsorship to ensure a smooth transition to Japan. About the role We are seeking a highly skilled and experienced Senior Software Engineer, General Backend Development . In this role, you will be responsible for developing and maintaining scalable, high-performance backend systems. A primary focus of this position will be diagnosing and resolving complex system performance bottlenecks and tackling intricate concurrency issues, such as race conditions. You will work closely with cross-functional teams to design and implement robust solutions that meet business requirements and ensure the long-term stability and success of our projects. Responsibilities Design, develop, and maintain robust and scalable backend systems using Java / Python / Go and related frameworks such as Spring, Undertow, Flask, FastAPI, etc. Collaborate with cross-functional teams, including frontend developers, product managers, and designers, to define system requirements and deliver high-quality solutions Perform code reviews to ensure adherence to coding standards and best practices Identify and troubleshoot issues, debug and optimize code for performance and efficiency. Participate in the entire software development lifecycle, from planning and design to implementation, testing, and deployment Stay updated with the latest industry trends and technologies, and continuously improve technical skills About you [Minimum qualifications] Proven experience as a Backend Developer, with at least 8 years of professional experience. Strong understanding of programming languages and related web frameworks. Apply object-oriented principles and design patterns to ensure code reusability, readability, maintainability, and scalability. Experience with functional programming paradigms, such as immutability, higher-order functions, and lambda expressions. Embrace a testing mindset and aim for comprehensive test coverage whenever feasible. Possess familiarity with any unit test framework for effective testing. Solid understanding of web application development principles, RESTful APIs, and microservices architecture. Experience with databases (SQL and NoSQL) and ORM frameworks. Experience with OLAP database. Familiarity with version control systems (e.g., Git). Strong problem-solving skills and ability to work independently as well as in a team environment. Excellent communication and collaboration skills. [Preferred qualifications] BS/MS degree in Computer Science or related field. Technical leadership experience. Good at profiling and debugging tools. High performance network service on Linux. Experience in Java development Experience in developing data structures, algorithms on top of Big Data platforms Experience in building and managing robust data warehouses. e.g. Trino/Presto , Pinot or Databricks. Design and architect large scale distributed systems. Design and implement distributed algorithms and data structure. Familiarity with Agile development methodologies. Familiarity with solving system performance issues or improving system performance Familiarity with SRE / DevOps related domains #LI-BD1 #LI-Hybrid