Senior Backend Developer

· Design, build and maintain reactive REST APIs using Spring Boot WebFlux, returning `Mono`/`Flux` end-to-end with no blocking calls anywhere in the request path.
· Develop and evolve event-driven background jobs running on AWS Lambda, triggered by SQS FIFO queues and EventBridge cron schedules, using a mediator/command-handler pattern with explicit concurrency control, retry policies and dead-letter queue handling.
· Model and query data in PostgreSQL (Aurora Serverless) using Spring Data R2DBC repositories and a type-safe jOOQ DSL for dynamic queries; leverage advanced Postgres features such as JSONB, ltree hierarchies, partitioning and appropriate GIN/GIST indexing.
· Author and review Flyway migrations (versioned and repeatable), keeping schema changes backward-compatible and validated in CI.
· Maintain a clean multi-module Gradle architecture — shared library, API service and Lambda worker — placing code in the correct module and avoiding cross-layer leakage.
· Design OpenAPI-first APIs: generated specs, standardized response envelopes and error models, spec linting in the pipeline, and consistent HTTP semantics
· Integrate with external systems — Snowflake (REST API with JWT key-pair auth and long-running query polling), internal product/entitlement services, and AWS services (S3, Secrets Manager, DynamoDB) via async SDK clients.
· Implement caching and performance strategies (Caffeine in-memory/Redis caches with TTLs, query tuning, parallel composition with `Mono.zip`) for high-volume ingestion and reporting workloads.
· Instrument services with OpenTelemetry / AWS Distro for OpenTelemetry (ADOT): custom spans, trace-context propagation across HTTP and SQS boundaries, structured logging, and RED metrics surfaced in CloudWatch Application Signals, X-Ray and Grafana dashboards.
· Write unit and integration tests with JUnit 5, Mockito and Reactor `StepVerifier`; keep coverage and quality gates green in SonarQube.
· Contribute to CI/CD: GitHub Actions build/test/scan workflows, multi-stage Docker builds, ECR image publishing, Lambda artifact packaging, and CloudFormation deployments across dev/QA/UAT/prod.
· Apply secure-by-default practices: OAuth2 resource-server token validation, role/entitlement-based authorization filters, least-privilege IAM, secrets in AWS Secrets Manager (never in code), and input validation at every boundary.
· Participate in code reviews, uphold documented coding standards, and mentor mid-level engineers on reactive patterns and cloud design.