Senior Backend Engineer any programming language

Responsibilities and Duties

• Design, develop, and optimize robust web services and microservices.
• Collaborate with cross-functional teams to design scalable, maintainable system architectures.
• Lead or contribute to technical design discussions and architectural decisions.
• Conduct thorough code reviews and ensure adherence to coding standards and best practices.
• Mentor and support junior engineers through pairing, feedback, and knowledge sharing.
• Troubleshoot and resolve complex technical issues across the stack.
• Continuously identify and address performance bottlenecks and system inefficiencies.
• Champion engineering quality through testing, monitoring, and proactive refactoring.
• Drive improvements to development workflows, tooling, and deployment processes.
• Take ownership of features and services from concept to production and beyond.

Qualifications

• 3-5+ 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-Haves

• Experience 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 Skills

• Business level English proficiency (TOEIC score of 700 or above equivalent).
• Japanese proficiency is not required but nice to have.

Technology Stack

• Language: Go, Java
• Database: MySQL, DynamoDB, Redis
• Infrastructure/Middleware: Terraform, Kubernetes, AWS (EKS, ECR, RDS, S3, SQS, SNS, etc...), GCP, Docker, Kafka, NginX, Consul

Tools Used

• Communication: Slack, Kibela, Zoom
• Monitoring: Datadog, Rollbar, Sentry
• Repository Management: GitHub
• CI/CD: Argo CD, Circle CI, Jenkins, GitHub Actions
• Ticket Management: Jira
• Security: Dependabot, Sonarqube

Caring Mental & Physical Recreation:

• Hybrid working
• Full salary in probation & 13th month salary
• Social insurance on full salary from probation
• Premium Health insurance from probation
• Flexible start 8AM-9AM from Mon-Fri
• 16 days off annually + 1 Birthday Leave
• Paternity leave extra 5 days
• Annual company trip; Quarterly team building activities
• Club activities
• Annual health check

Caring Career & Development:

• Clear Career path
• Foreign language & International technology-related certifications sponsoring
• Well-equipped facility: Macbook pro, additional monitor,..
• Soft skill workshops
• Tech seminars
• Monthly and biannually Recognition Awards
• Performance review twice/year