【★Senior Back-End Engineer】 Hybrid Work / Mega-Venture Company / JLPT N4

★Back-End Engineer / Marketing Research BusinessJapanese Language: N4 OK★Hybrid Work★Mega Venture Company★More than 120 days off per year◆ Annual Salary： 8 million ～ 12 million yen.-------------【About the company】-------------The company provides services and solutions to support the marketing activities of client companies. The company acquires a variety of data from its proprietary consumer panel of over 1.3 million consumers in Japan and provides it to its client companies.The company's strengths include online research, which has the No. 1 market share in Japan, digital marketing research, and data consulting data utilization support (data utilization support).・Marketing Research Business-Internet research-Off-line research such as FGI/DI, CLT, HUT, etc.-Survey planning, tabulation, and analysis・Digital Marketing Research Business・Database Business-Purchasing Database-Lifestyle database・Self-directed research ASP business・Other marketing-related consulting business-------------【 Job Description】-------------【Responsibilities】・Designing and developing a high-quality, high-performance, scalable, and secure software platform that meets the requirements of the company's business.・Analyzing and understanding the company's existing legacy systems, including their architecture, dependencies, and limitations.・Prioritizing maintainability and quality by writing clean, well-documented, and maintainable code. You'll also develop comprehensive test code to ensure software quality and contribute to the continuous improvement of the codebase.・Promoting Agile best practices by actively participating in agile teams and contributing to all phases of the development lifecycle.・Ensuring code quality by participating in code reviews for both in-house and vendor-developed code, providing constructive feedback, and confirming adherence to coding standards and best practices.・Collaborating effectively by building trust with stakeholders and taking accountability for development.・Mentoring and fostering growth by providing technical guidance, evaluations, and mentorship to junior engineers.【Position Highlights】The Global Technology division, which supports the company's business growth, has high expectations and its results are being closely watched.The company's mission is to use IT to revolutionize its business and build new ventures. By leveraging cutting-edge architecture and technology to design and develop the latest platforms and processes, you will be building the future.Therefore, you can build a strong foundation for your engineering career by expanding your skill set and knowledge in both legacy and modern technologies, and by contributing to significant business and organizational transformation. Beyond that, you'll work with a talented and collaborative team, gaining leadership, mentorship, and specialized expertise in a fast-paced environment.Furthermore, you can also gain work experience as a Technical Product Manager as part of your career path.*You'll be assigned to the Global Technology Division-------------【 Requirements】-------------【Required】5+ years of experience designing, developing, and leading large-scale application backend systems.Extensive experience building and maintaining robust APIs, including gRPC and RESTful architectures.Proficiency in at least one major backend server language and framework (e.g., Go/Gin, Python/Django, Java/Spring).Understanding and experience with CI/CD and DevOps.Experience designing and developing products in the cloud (e.g., AWS, Azure, GCP).Experience with development and architectural design using container technology.Experience using and designing databases (RDBM/NoSQL).Ability to evaluate and select appropriate technologies (SaaS, OSS, etc.) based on trade-offs, costs, and business needs.Experience with the full software lifecycle, including the design, delivery, operation, and maintenance of complex systems.Ability to define error budgets, SLAs, and SLOs to ensure system reliability and meet business requirements.A proven track record of leading agile projects, making architectural decisions, mentoring junior engineers, and promoting best practices.Familiarity with security best practices (ISMS, etc.), data encryption, access control, and compliance standards (GDPR, etc.).Business-level fluency in English (reading, writing, and conversation).【Preferred】Understanding and experience with DevOps.Active contributor to open-source projects.Experience in external technical outreach (e.g., presentations, blogs).Experience in market research or the ad technology industry.Understanding and experience with Microservices architecture.Knowledge of statistical concepts and their application in data analysis.【Ideal Applicants】Able to boldly take on challenges and learn from many failures.Have a high sense of ownership and a strong will to get things done.Able to demonstrate strength in a team environment and communicate effectively with diverse stakeholders.Driven by a desire to build high-quality, high-impact software.Enthusiastic about tackling complex challenges and finding creative solutions.--------------------------------------------------【Working Time 】Discretionary Work System【Allowance】Remote work allowanceLate night overtime allowanceHoliday work allowanceCompensation based on various MVP systems【Holiday】2 days off per week (Sat. and Sun.), national holidays, GW, summer / New Year holidays, annual paid leave (10 days in the first year), congratulation or condolence leave, parental leave, andHappy holiday (special paid vacation: 6 days per year), Thanks holiday (long-service refreshment vacation)More than 120 days off per year【Welfare】Full social insurance(health insurance, employee pension, unemployment insurance, workers' accident compensation insurance)Various recreational facilities (Hokkaido, Tateshina, Karuizawa, Tokyo, Kyoto, Kobe, Fukuoka, etc.), sports facilities, restaurants, etc.Privileged use of sports facilities, restaurants, etc., and congratulatory and condolence paymentsLife plan system (Macromill defined contribution pension plan), employee stock ownership plan-------------------------------------------------------------------------