Domain Architect

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 domains 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 GCP

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

Required Skills:

C#.Netkafkaazurepaas