Senior Backend Engineer (Go/Java)

As a Backend Engineer within the Platform teams, you will design, build, and operate highly scalable, highly available, and fault-tolerant AI-first E-Commerce and Digital Experience solutions that power Sun Group’s diverse ecosystem. You will work on distributed systems serving millions of users and millions of transactions per month, addressing complex real-world scenarios across travel, hospitality, real estate, aviation, and entertainment. Our platforms integrate with world-class core systems and are natively enhanced by state-of-the-art AI technologies. In this role, you will collaborate closely with your product development team and partners to elevate Sun Group’s services and contribute to Vietnam’s broader digital transformation.Working location: Sun Grand Ancora, 3 Luong Yen, Hanoi (onsite) Responsibilities- Design and operate microservices and event-driven components (Kafka/RabbitMQ) with strong observability (metrics, logs, traces), SLOs, and graceful degradation.- Build idempotent, secure REST/gRPC APIs for platform services; handle retries, backoff, saga/outbox patterns, and data consistency.- Integrate with payment gateways, third-party partners and Sun Group’s internal platforms securely via OAuth2/OIDC/JWT, API Gateway, and proper rate-limiting.- Apply Agile and DevOps practices; CI/CD, automated testing, monitoring; to deliver high-quality code at speed.- Contribute to technical design discussions, architecture improvements, and engineering best practices. Qualifications- Bachelor’s degree in Computer Science, IT, Electronics/Telecom, or related fields.- 5+ years backend development on Linux; solid in at least one of Go or Java- Proven experience designing high-volume transactional services (throughput, latency, scalability, caching with Redis).- Hands-on with RDBMS (SQL Server, PostgreSQL, MySQL) and NoSQL (MongoDB/Redis); schema design, indexing, and performance tuning.- Experience with Docker, Kubernetes, CI/CD; automated testing and observability.- Strong understanding of data structures, algorithms, object-oriented design, and familiarity with WebSocket or gRPC is a strong plus.- Exposure to cloud platforms such as Azure, AWS, or GCP is an advantage. Experience with Kafka, API Gateway, service mesh is a plus.Soft Skills- Strong problem-solving and system thinking for complex, real-world transactional flows.- Clear communicator, collaborative with cross-functional teams.- Growth mindset, fast learner, comfortable with ambiguity; proactive in raising quality bars. WHY YOU‘LL LOVE WORKING HERE- “An cư lạc nghiệp” policy: eligible employees receive full-value commercial apartments for long-term tenure.- Premium SunCare Insurance for employees and their families (fully covered for employees).- Annual comprehensive health check-up at Sun Group International Hospital.- Complimentary access to theme parks, cable cars, cultural/symphonic events, plus exclusive discounts at Hotels & Resorts.- Special offers across aviation, NCB banking services, and real estate products.- A dynamic, innovation-driven working environment where talent and contributions are recognized and rewarded.