Dice is the leading career destination for tech experts at every stage of their careers. Our client, ClientServer Technology Solutions LLC, is seeking the following. Apply via Dice today! **Lead Backend Engineer – Notification Hub (Onsite) Location: Onsite (Springfield, MO / Dallas, TX) Role Type: C2C or W2** **Note** : Need only very senior resource who has stronger Coding skills. Preferred work location- Springfield, MO **Role Summary (JD Should match 100%)** Our Client is modernizing its customer messaging ecosystem through a centralized Notification Hub built on Google Cloud Platform (Google Cloud Platform). The Lead Backend Engineer will drive the architecture and development of this platform, overseeing GKE-based microservices, Pub/Sub event workflows, Avro schema governance, secure webhook processing, vendor integrations, and preference synchronization. This role sets the technical direction and ensures platform scalability, resilience, and extensibility. **Key Responsibilities** - Lead design and development of Notification Hub services: Notification Router, Webhook Receiver, Preference Sync, and related components. - Architect and maintain event-driven pipelines using Google Pub/Sub with concurrency, retry/DLQ, idempotency, and backpressure handling. - Define and govern Avro schemas for all event types (order, cart, preference, profile). - Develop and evolve the vendor-agnostic adapter layer for messaging providers (Listrak today; Iterable/Braze/etc. future). - Oversee secure webhook ingestion through Apigee → GKE with HMAC validation and rate limiting. - Enforce zero-trust security using IAM, Workload Identity, and least-privilege access. - Drive platform-level observability: logs, metrics, distributed tracing, and event audits. - Collaborate with Digital, Loyalty, CRM, MDM, Architecture, and Infrastructure teams. - Provide technical leadership to offshore Senior Developers, Developers, and QA/Automation. - Participate in architecture reviews, capacity planning (4M+ monthly events), and production operations. **Required Skills & Experience** - 10+ years backend engineering; 5+ years implementing event-driven architectures. - Strong expertise in Java, Spring Boot, microservices, and distributed systems. - Hands-on experience with GKE/Kubernetes, Pub/Sub or Kafka, and cloud-native design. - Experience with Avro, Protobuf, or schema-based payload governance. - Strong integration experience with external APIs (MarTech, CRM, MDM, or messaging systems). - Understanding of IAM, secure webhook handling, and zero-trust principles. - Experience implementing observability frameworks across microservices. **Preferred Qualifications** - Experience building or operating large-scale notification, messaging, or orchestration platforms. - Exposure to ESPs (Listrak, Braze, Iterable, SFMC, Adobe Campaign). - Experience with hybrid on-prem → cloud event ingestion models.