Strong proficiency in Golang, TypeScript/Node.js, or Python Deep AWS experience (Lambda, ECS, SQS/SNS, API Gateway, CloudWatch, DynamoDB/RDS, S3) with understanding of serverless and cloud-native patterns MongoDB and PostgreSQL expertise, including schema design for high-throughput integration workloads and query performance optimization Hands-on experience with REST APIs, OAuth flows, webhook systems, async workflows, message queues, event-driven architectures, and distributed transactions Strong understanding of API security practices including HMAC signatures, token-based authentication, and ideally mutual TLS Proven ability to write clean, maintainable, well-tested code with strong attention to edge cases and failure modes Debugging skills using logs, metrics, traces, and third-party diagnostic tools Experience with CI/CD pipelines, version control, automated testing, and modern DevOps workflows Strong written and verbal communication