Senior Staff Engineer - Enterprise Middleware Platform & Migration Architecture

Responsibilities

• Essential Job Functions & Tasks
• Design and implement multi-tenant middleware platform with tenant-level routing, security isolation, and configuration management supporting internal applications and external B2B partners through syndication architecture.
• Architect Hybrid CIS Routing Engine with Redis-backed account-level routing enabling dynamic routing between multiple CIS backends (MACSS, partner platforms) based on tenant configuration.
• Design abstraction layers across multiple backend CIS systems normalizing differences in customer data models, business rules, and API contracts.
• Establish OpenAPI 3.0 specifications and REST API standards suitable for external partner consumption with versioning, backward compatibility, and SLA guarantees.
• Lead architecture and implementation of large-scale customer account migration platform supporting multi-million account migrations across CIS/billing systems.
• Design and build data seeding/bootstrap, bi-directional synchronization, reconciliation logic, and phased cutover strategies with rollback capabilities for CIS migrations.
• Build migration orchestration workflows handling dependencies across customer, billing, payment, identity, and field service domains with data quality validation and discrepancy detection.
• Build production-grade integration clients for z/OS mainframe systems using z/OS Connect, CICS transactions, MQ messaging, and batch file exchanges.
• Implement resilience patterns for mainframe connectivity including circuit breakers, retries, timeout handling, and graceful degradation supporting utility-scale transaction volumes.
• Handle mainframe-specific integration challenges: EBCDIC/ASCII conversion, copybook parsing, fixed-length record formats, transaction coordination, connection pooling, and batching.
• Develop core middleware framework built on Spring Boot 3.X+ and Java 21+ with standardized libraries for OAuth2 security, Azure Key Vault secrets management, structured JSON logging, and distributed tracing.
• Create CI/CD pipeline templates, Helm chart standards, and blue/green deployment patterns for Kubernetes/OpenShift with horizontal scaling and high availability.
• Integrate observability tooling: Splunk, Dynatrace APM, Prometheus/Grafana, Jaeger with SLO/SLA monitoring patterns and runbook templates.
• Provide comprehensive documentation, code samples, migration guides, and developer onboarding materials.
• Conduct framework design reviews, establish governance standards, and mentor engineers on platform usage and best practices.
• Required Skills & Experience
• 10-15 years building enterprise-grade middleware platforms, with at least 5 years architecting multi-tenant platforms designed as reusable products (not just internal APIs) that support both internal applications and external B2B partner integrations.
• Proven track record leading large-scale customer data migrations involving 1M+ accounts across CIS, billing, or CRM platforms including data seeding, bi-directional synchronization, reconciliation, and phased cutover execution.
• 5+ years hands-on experience integrating with z/OS mainfr

Additional Information

Job Posting End Date 07-04-2026 Please note the job posting will close on the day before the posting end date. Job Summary Part of a larger team delivering high quality technology solutions to the business. Design, develop and install software solutions. Build high-quality, innovative and fully performing software in compliance with internal architecture, development & design standards & best practices. Design, modify, develop, write, implement and troubleshoot software programming applications. Support and/or install software applications. Lead the testing process through test review and analysis, test witnessing and certification of software. Works within a Waterfall or Agile methodology/framework based team. Collaborates heavily with Project Management, Business Analyst and Infrastructure Job Families. Job Description We are seeking a highly specialized platform architect to design and build our next-generation multi-tenant middleware platform serving as the strategic integration layer between multiple Customer Information Systems (CIS), z/OS mainframe systems, and modern cloud applications. This platform supports both internal AEP applications and external B2B partner integrations through our syndication architecture, and orchestrates large-scale customer data migrations involving millions of accounts across CIS platforms. This is not a typical microservices development role. The successful candidate must have 10-15 years building product-grade, multi-tenant middleware platforms (not just internal APIs), leading enterprise-scale CIS/billing migrations (1M+ accounts), and integrating mainframe systems at utility-scale transaction volumes. The role requires deep domain expertise across enterprise customer platforms (CIS, billing, payments, identity, field service) typically found in utility, telecom, or financial services industries.

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