Payments Domain Architect

We're looking for a hands-on architect to lead the payments area of a large-scale digital commerce platform. You'll be responsible for how every online order gets paid for, from the first authorization through adjustments, capture, and refunds, across card, SNAP, and WIC tenders.
You'll shape a platform built on Temporal, Kafka, and Azure, with the goal that no payment is ever lost, duplicated, or left unreconciled, even when a processor stops responding or a process breaks midway. You'll also set the standards the teams follow for versioning, monitoring, fault tolerance, and card-data security.
You'll build prototypes and reference code, review pull requests, and coach senior developers. You'll also serve as the technical lead in conversations with processors, benefit program partners, and the finance organization, and work alongside the pricing, ordering, and fulfillment teams so that payment data flows accurately all the way into the books.
Responsibilities
Ownership & Direction
Set the technical vision and roadmap for payments and make the major design call
sDraw clear lines around what payments owns, and establish a common model and terminolog
yAssign each business function to the right service or workflo
wProduce architecture review documents and decision record
s
Desi
gn
Create payment operations that are safe to retry and never execute twice, using patterns such as sagas, compensating actions, transactional outbox/inbox, and reconciliat
ionDefine interfaces and event schemas shared with neighboring teams (OpenAPI, JSON Schema, Protob
uf)Clarify which systems produce data, which verify it, and what downstream consumers can tr
ust
Workflow & Event Architec
ture
Implement long-running workflows in Temporal, including cross-team calls through
NexusEstablish safe upgrade practices for in-flight workflows (patching, build IDs, replay t
ests)Model Kafka events with governed schemas, retry handling, and dead-letter ro
uting
Payment Proc
essing
Design payment handling for each stage of an order: placement, changes, cancellation, completion, and
returnsCoordinate orders paid with more than one tender, including card, SNAP,
and WICLead integrations with processors and benefit providers covering authorizations, captures, voids, refunds, and re
versalsResolve uncertain or timed-out transactions without charging customers twice or leaving orphane
d holdsKeep SNAP and WIC handling aligned with federal USDA and state-level requi
rementsShrink PCI footprint through tokenization (network tokens, DPAN), encryption, and key r
otationAdd new payment options such as mobile wallets and split p
aymentsEnable third-party marketplace payments, including multiple captures, over-capture limits, and split set
tlementWork with finance on reconciliation, transaction log reporting, and ledger a
ccuracySet and track service targets for authorization, capture, refund, and recovery
success
Reliability &
Testing
Engineer fault tolerance using Polly and Temporal retry conf
igurationKeep authorization latency comfortably inside checkout time limits across Azur
e and GCPImplement end-to-end tracing across APIs, Kafka, and Temporal using Open
TelemetryOwn the test approach: unit, contract, replay, simulated gateways, and performanc
e testing
Technical
Leadership
Conduct code reviews and develop senior enginee
ring talentRetire legacy flows through controlled, feature-flagg
ed rolloutsApply AI-assisted development tools to speed
up delive
ry
Must Have
10+ years in software engineering, with at least 5 years focuse
d on paymentsStrong domain-driven design background (bounded contexts, domain events, con
text mapping)Deep, current, hands-on C# and .
NET 8+ skillsProduction use of Temporal or a comparable durable work
flow platformProduction
use of KafkaAzure platform services (App Service, Cosmos DB, API Management, Key Vault) or GC
P equivalentsContainerized applications running
on KubernetesReal-world implementation of idempotency, saga, and reconcilia
tion patternsPCI DSS and tokenizati
on experienceObservability design using OpenTelemetry or an
APM platformHistory of getting multiple engineering teams aligned on a common
architectur
e
Nice to Have
Temporal Nexus or Wo
rker VersioningSNAP / WIC pay
ment processingApple Pay
and Google PayProcessor APIs such as Aurus, Adyen, Fiserv, Wor
ldpay, or ChaseNetwork tokenization, DPAN, multi-capture, and marketp
lace settlementMulti-cloud
(Azure and GCP)LaunchDarkly or similar featu
re-flag tooling.NET Aspire, Testcontainers, Mocko
on, or WireMockRetail finance data (transaction logs, sales audit,
general ledger)Grocery or omnichannel re
tail background

Work arrangement
Yes