Payments Domain Architect | Azure, Kafka & Temporal

Stellar IT Solutions; St. Louis (MO); Remote; USD 180,000 - 240,000; Full time

Job summary

Stellar IT Solutions in the United States seeks a Domain Architect to own payments architecture, technical roadmap, and key domain decisions across order and payment workflows. Define domain boundaries and models, specify ARB-ready specs, and design idempotent, exactly-once operations (sagas, outbox/inbox) with API contracts (OpenAPI/Protobuf) and schema governance.

Lead durable workflows on Temporal and Kafka events, ensure PCI DSS/tokenization alignment, and mentor senior engineers while

Qualifications

• 10+ years engineering experience with emphasis on payments systems
• Domain-driven design: bounded contexts, domain events, and context mapping
• Expert level C#/ .NET 8+ and hands-on coding
• Temporal (preferred) or durable workflow engine in production
• Kafka in production
• Azure PaaS: App Service, Cosmos DB, API Management, Key Vault
• Containerization and Kubernetes
• Idempotency, saga, and reconciliation patterns in production
• PCI DSS and tokenization
• OpenTelemetry or APM observability design
• Track record of aligning multiple teams on a shared architecture

Responsibilities

• Own the domain's architecture, technical roadmap, and key decisions
• Define domain boundaries, domain model, and shared vocabulary
• Decide which service or workflow owns each business operation
• Write ARB-ready specs and ADRs
• Design idempotent, exactly-once operations (sagas, outbox/inbox, reconciliation)
• Define API and event contracts with peer domains (OpenAPI, JSON Schema, Protobuf)
• Establish trust boundaries for data computation, validation, and consumption
• Build durable workflows on Temporal, including cross-domain calls
• Set versioning standards for long-running workflows and replay testing
• Design Kafka domain events with schema governance, retries, and dead-letter queues
• Architect payment workflows across the order lifecycle (create, edit, finalize, refund)
• Lead PCI DSS scope reduction, tokenization, encryption, and key rotation
• Extend domain to new tenders (Apple Pay, Google Pay) and split tender
• Partner with Finance on reconciliation and TLOG reporting
• Define payment SLOs: auth rate, capture, refunds, and failures
• Review production code and mentor senior engineers
• Lead feature-flagged migrations off legacy paths
• Use AI coding agents and context engineering to speed delivery

Skills

Payments architecture

C# / .NET 8

Temporal

Kafka

Azure PaaS

Domain-driven design

OpenTelemetry

API design

Tools

OpenAPI

JSON Schema

Protobuf

Job description

Stellar IT Solutions in the United States seeks a Domain Architect to own payments architecture, technical roadmap, and key domain decisions across order and payment workflows. Define domain boundaries and models, specify ARB-ready specs, and design idempotent, exactly-once operations (sagas, outbox/inbox) with API contracts (OpenAPI/Protobuf) and schema governance.

Lead durable workflows on Temporal and Kafka events, ensure PCI DSS/tokenization alignment, and mentor senior engineers while