Backend Software Engineer (API Dev)

[API Dev Team]

The API Dev team is responsible for the backend, which is the core of the product. We are committed to efficiently processing thousands of transactions per second in an environment where tens of thousands of users simultaneously connect and interact in real-time.

The main technology stack consists of Java and Spring, with Kotlin gradually being expanded and applied.

In large-scale services, even small inefficiencies can become major problems. Prioritizing performance and stability, we identify and resolve potential issues early through meticulous code reviews and validation processes.

We operate global large-scale services stably 24 hours a day, overcoming these challenges with excellent team members. We believe this experience serves as an optimal foundation for growth as an engineer.

Responsibilities

• Multi-tenancy Backend Development and Operation
• Designs, develops, and operates service API servers commonly used across various services.
• Implements a structure that flexibly accommodates service-specific requirements while being highly scalable and maintainable.
• Coordinates functional gaps between services and actively identifies areas that can be standardized.
• Service Feature Development and Operation
• Collaborates with individual service teams to integrate new features into the platform and operate them stably.
• Drives continuous improvement based on user feedback and data.
• Platform Quality and Stability Assurance
• Designs and operates architectures considering high availability and high performance.
• Maintains reliability through fault response, proactive monitoring, and problem prevention.
• Leads refactoring and structural improvements to effectively manage long-term technical debt.
• Organizational Contribution
• Enhances team productivity through test code writing, establishing a code review culture, and improving development tools and processes.
• Actively participates in internal and external technical sharing (e.g., blogs, sessions, retrospectives) to vitalize technical communication.

Requirements

• 7+ years of experience as a backend software engineer or equivalent skill.
• Computer Science major or equivalent foundational knowledge.
• Deep understanding of the Java / Spring ecosystem.
• Experience operating services in a JVM-based Production environment.
• Practical experience in REST API design and operation.
• Understanding of RDBMS and basic web security.
• Experience flexibly solving problems in collaboration with various stakeholders.
• Interest in Azar or global communication services.

Preferred Qualifications

• Experience with Kotlin and multi-tenancy architecture.
• Experience operating a platform commonly used by multiple derivative services.
• Experience maintaining system stability even during traffic surges.
• Experience operating Kubernetes-based services.
• Strong opinion and practical experience with Microservice architecture.
• Experience utilizing NoSQL technologies.
• Interest in problem-solving from a business/product perspective.
• Experience directly designing or introducing tools/processes that improve organizational productivity.

Employment Type/Recruitment Process

• Employment Type: Full-time
• Recruitment Process: Document Screening > Coding Test > 1st Interview > Recruiter Call > 2nd Interview > 3rd Interview (if applicable) > Final Offer (* Additional interview stages may be conducted if necessary.)
• For document screening, only successful candidates will be notified individually.
• Application Documents: Free-form detailed resume based on career (Korean or English, PDF)