Core Backend Engineering

• Design and build production‑grade microservices using Java 17+ and Spring Boot 3.x, adhering to clean code and SOLID principles.
• Own services end‑to‑end from spec – design – implement – test – deploy – monitor – iterate, with no hand‑offs.
• Author OpenAPI 3.x specifications and Architecture Decision Records before writing code, championing spec‑driven development.
• Write comprehensive unit, integration, and contract tests using TDD discipline with at least 80% meaningful coverage.
• Design and manage event‑driven architectures using Apache Kafka for asynchronous workflows, domain events, and data streaming.
• Architect and deploy services on AWS (ECS/EKS, Lambda, RDS, S3, SQS/SNS, CloudWatch, IAM).

Core Backend (Non‑Negotiable)

• Java 17+ – records, sealed classes, virtual threads / Project Loom.
• Spring Boot 3.x – Spring Security, Spring Data JPA/JDBC, Spri...