Senior Backend Engineer (any programming language)

Qualifications3–5+ years of professional experience in backend software development using languages such as Java, Kotlin, Go or similar.Proven experience designing and building scalable RESTful APIs and microservices.Strong understanding of relational databases (e.g., PostgreSQL, MySQL) and data modeling principles.Experience with cloud platforms (e.g., AWS, GCP, Azure), and modern infrastructure practices.Familiarity with CI/CD pipelines, containerization (e.g., Docker), and version control systems (e.g., Git).Strong analytical and debugging skills; able to troubleshoot and resolve complex issues independently.Demonstrated ownership of technical projects from design through deployment.Comfortable working collaboratively in a cross-functional, agile environment.Bonus: experience leading initiatives, mentoring other engineers, or contributing to system architecture.Nice-to-HavesExperience with AWS or other major cloud platforms.Proficiency with containerization technologies such as Docker, and familiarity with orchestration tools like Kubernetes.Solid understanding of microservices architecture and related best practices.Familiarity with message-driven architectures and tools such as Kafka or similar.Understanding of Domain-Driven Design (DDD) principles and how to apply them in real-world systems.Experience working effectively in multinational or cross-cultural teams.Strong communication skills and a collaborative mindset, with the ability to contribute in distributed environments.Language SkillsBusiness level English proficiency (TOEIC score of 700 or above equivalent).Japanese proficiency is not required but nice to have.Technology StackLanguage: Go, JavaDatabase: MySQL, DynamoDB, RedisInfrastructure/Middleware: Terraform, Kubernetes, AWS (EKS, ECR, RDS, S3, SQS, SNS, etc…), GCP, Docker, Kafka, NginX, ConsulTools UsedCommunication: Slack, Kibela, ZoomMonitoring: Datadog, Rollbar, SentryRepository Management: GitHubCI/CD: Argo CD, Circle CI, Jenkins, GitHub ActionsTicket Management: JiraSecurity: Dependabot, Sonarqube