Senior Backend Engineer

Hi Greetings form the Conch technologies Senior Backend Engineer 12-month contract Location: Bay Area, onsite hybrid (must be local) Project: Backend platform engineering on a high-volume transactional system. Correctness- and idempotency-sensitive work. Must-have (4): • 7 years Java backend, production scale • Kafka Flink in production • Card payments / card processing experience — auth → clearing → settlement lifecycle and reconciliation • GraphQL AWS (ECS/EKS, SQS/SNS, S3, RDS/DynamoDB) Ni…