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Senior Backend Engineer / API Integration Engineer

Well Treasure Asia   Colombo • Full-time

Role Summary

We are looking for a Senior Backend Engineer focused on Go services, API integration, database design, transaction-heavy business logic, and production reliability on AWS. This role is for engineers who can build stable backend systems, handle third-party integrations, and solve production problems with clear logging and data consistency.

Key Responsibilities

  • Design and develop backend services using Go/Golang
  • Build REST APIs, internal APIs, admin APIs, callbacks, and webhooks
  • Design database schemas, migrations, indexes, and optimized SQL queries
  • Implement retry, timeout, idempotency, duplicate prevention, and failure-state handling
  • Integrate third-party APIs and maintain clear integration documentation
  • Improve performance using Redis, queues, async processing, or query optimization
  • Add structured logging, metrics, tracing, and operational visibility
  • Debug production issues and improve backend reliability on AWS

Required Qualifications

  • 5+ years backend development experience
  • 3+ years hands-on Go/Golang experience or strong recent Go production experience
  • Strong SQL and database design experience
  • Experience with REST API design and third-party API integration
  • Experience with Docker, Linux, Git, and CI/CD
  • Understanding of error handling, logging, retry, timeout, and data consistency
  • Basic AWS experience with services such as EC2/ECS/EKS/Lambda/RDS/S3/CloudWatch
  • Ability to write technical documentation

Preferred Qualifications

  • Payment, wallet, gaming, fintech, campaign, CRM, or back-office experience
  • Redis, RabbitMQ, Kafka, or event-driven architecture
  • WebSocket or real-time backend systems
  • Transaction consistency, idempotency, reconciliation, settlement, or ledger experience
  • Terraform or Kubernetes exposure
  • Ability to communicate API contracts clearly with React frontend engineers