Domain Architect

Stellar IT Solutions

St. Louis (MO)

Remote

USD 180,000 - 240,000

Full time

7 days ago

Be an early applicant

Get a reply from this employer

Your resume and cover letter, tailored to exactly what they’re hiring for.

Get past ATS filters

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

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