Domain Architect
Remote - EST or CST timezone
Long Term Contract
Must Haves - -
- 10+ years of experience building payment systems
- Expert level C#/ .Net 8 - must be currently hands on
- Azure PaaS experience
- Kafka experience (in production)
Domain Ownership
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
Architecture & Design
Design idempotent, exactly-once operations (sagas, compensation, outbox/inbox, reconciliation)
Define API and event contracts with peer domains (OpenAPI, JSON Schema, Protobuf)
Establish trust boundaries: who computes data, who validates it, and what consumers can rely on
Workflows & Messaging
Build durable workflows on Temporal, including Nexus cross-domain calls
Set versioning standards for long-running workflows (patching, build IDs, replay testing)
Design Kafka domain events with schema governance, retries, and dead-letter queues
Payments
Architect payment workflows across the order lifecycle: create, edit, cancel, finalize, refund
Design multi-tender orchestration across credit/debit, EBT SNAP, and EBT WIC
Architect processor and benefit-provider integrations: auth, capture, void, refund, reversal
Handle gateway timeouts and unknown outcomes without double-charging or leaving ghost charges
Ensure EBT SNAP and WIC compliance with USDA FNS and state program rules
Lead PCI DSS scope reduction, tokenization (network tokens, DPAN), encryption, and key rotation
Extend the domain to new tenders such as Apple Pay, Google Pay, and split tender
Support 3P marketplace payments: multi-capture, over-capture rules, and split settlement
Partner with Finance on reconciliation, TLOG reporting, and general-ledger accuracy
Define payment SLOs: auth rate, capture success, refund success, and compensation failures
Reliability & Quality
Build resilience with Polly and Temporal retry policies
Keep payment authorization well within checkout timeout budgets across Azure and Google Cloud Platform
Instrument tracing across HTTP, Kafka, and Temporal with OpenTelemetry
Set the testing strategy: unit, contract, replay, gateway simulation, and load
Leadership
Review production code and mentor senior engineers
Lead feature-flagged migrations off legacy paths
Use AI coding agents and context engineering to speed up delivery
Must-Have
[ ] 10+ years engineering, 5+ years building payment systems
[ ] Domain-driven design: bounded contexts, domain events, context mapping
[ ] Expert C# / .NET 8+ and still codes
[ ] Temporal (preferred) or similar durable workflow engine in production
[ ] Kafka in production
[ ] Azure PaaS: App Service, Cosmos DB, APIM, Key Vault --> Similar technology on Google Cloud Platform
[ ] Containerization, running code in 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
Nice-to-Have
[ ] Temporal Nexus or Worker Versioning
[ ] EBT SNAP / WIC processing
[ ] Digital wallets: Apple Pay, Google Pay
[ ] Gateway APIs: Aurus, Adyen, Fiserv, Worldpay, Chase
[ ] Network tokens, DPAN, multi-capture, marketplace split settlement
[ ] Multi-cloud: Azure + Google Cloud Platform
[ ] LaunchDarkly-driven migrations
[ ] .NET Aspire, Testcontainers, Mockoon/WireMock
[ ] Retail finance feeds (TLOG, sales audit, GL)
[ ] Grocery/omnichannel retail
[ ] Google Cloud Platform experience
