Backend Engineer

Deskripsi Pekerjaan

• ABOUT THE ROLE
• We are seeking an experienced Backend Engineer to develop and maintain scalable backend services for an omnichannel clienteling platform. The role involves building microservices, integrating messaging systems and third-party platforms, and ensuring system performance, reliability, and security.
• KEY RESPONSIBILITIES
• - Develop and maintain backend services using Java and Spring Boot for conversation management, message routing, campaigns, and sales attribution.
• - Design and optimize data models across PostgreSQL and MongoDB.
• - Build event-driven architectures using Kafka, including message ordering, retries, and error handling.
• - Develop and maintain integrations with the WhatsApp Business Platform, including message handling, webhooks, templates, and delivery status tracking.
• - Implement phone number normalization and matching to connect incoming WhatsApp messages with customer records.
• - Integrate chatbot, VoIP, and Microsoft Graph services, including bot-to-human handoff workflows.
• - Implement real-time messaging using WebSockets and ensure horizontal scalability across multiple instances.
• - Optimize backend services to support thousands of concurrent users while meeting performance and availability targets.
• - Implement access control mechanisms using RBAC or ABAC, alongside customer data masking.
• - Estimate tasks, manage development priorities, and deliver projects according to agreed timelines.
• QUALIFICATIONS
• - Minimum 4 years of backend development experience, including production experience with Java and Spring Boot.
• - Strong proficiency in Java 21 or later and Spring Boot 4.
• - Strong knowledge of PostgreSQL, including schema design, query optimization, indexing, and connection pooling.
• - Production experience with Redis and Kafka.
• - Experience with WebSockets or other long-lived connection systems at scale.
• - Strong understanding of concurrency, idempotency, distributed locking, and consistency trade-offs in microservices.
• - Experience with Spring Security, OAuth2, JWT, and implementing RBAC or ABAC.
• - Experience with Docker, Kubernetes or ECS, CI/CD pipelines, and AWS or GCP.
• - Experience writing unit and integration tests using JUnit and Testcontainers.
• - Bachelor's degree in Computer Science, Information Technology, or a related field.