Vaan is a Shopify Platinum design & technology agency and the home of Brand Conversion Design.
We migrate, design, and build high performing eCommerce experiences leveraging our Brand Conversion Design framework, industry partnerships & deep eCommerce technical expertise. Solving the tension between optimization and design, we help brands make the most of their eCommerce.
About the role
We're in flight on a platform migration to
Shopify Plus B2B
, with
a legacy on premise ERP
as the system-of-record ERP. This role is central to designing and building the
middleware/integration layer
that connects Shopify to ERP and surrounding systems (payments, tax, inventory, fulfillment, pricing). This is a complex, high-stakes migration involving real-time and batch data sync, custom B2B logic, and payment processing — not a simple app-to-app connector job.
Expected Contract Duration:
4 months
Responsibilities
Design and build middleware services (Node.js/NestJS) that synchronize orders, customers, pricing, inventory, and fulfillment data between Shopify B2B and ERP
Architect resilient integration patterns: queues, retries, idempotency, reconciliation, and error recovery for high-volume transactional data
Build and consume REST/GraphQL APIs (Shopify Admin/Storefront APIs, ERP APIs/EDI, and any third-party services)
Implement B2B-specific logic: company/location accounts, tiered/contract pricing, custom catalogs, payment terms (net terms), quoting, and approval workflows
Integrate payment processing (tokenization, authorization/capture flows, refunds, reconciliation) in a way that's PCI-aware and auditable
Work closely with the ERP functional team to map data models and business rules between systems
Write tests, documentation, and runbooks; participate in code review and architecture discussions
Support cutover planning: data migration, dual run/parallel testing, and rollback strategy
Qualifications
4+ years professional backend software development experience (Engineer 2 baseline)
Strong proficiency in production NestJS (modules, providers, DI, guards/interceptors, decorators)
Solid TypeScript fundamentals; comfortable owning services end-to-end, not just feature tickets
Experience integrating with at least one ERP or large enterprise system (order management, inventory, financials) via API, EDI, flat file, or message queue
Experience building or consuming Shopify APIs (Admin API, GraphQL, webhooks, or apps) — Shopify Plus experience a plus
Working knowledge of relational databases (Postgres/MySQL) and schema design for transactional data
Experience with asynchronous/event-driven architecture: message queues (SQS, RabbitMQ, Kafka, or similar), background jobs, retry/backoff patterns
Understanding of idempotency, data consistency, and reconciliation in distributed systems (critical for order/payment sync)
Comfortable working independently in an ambiguous, evolving integration landscape — this isn't a fully-spec'd ticket queue
Strong communication skills; able to work directly with ERP/functional stakeholders, not just engineers
Nice to Have
Direct experience with mid-market/enterprise ERPs — Infor CloudSuite, NetSuite, Epicor, Dynamics 365 including its API layer, IDO/business logic, or EDI patterns
Experience with Shopify B2B features: company accounts, B2B checkout, customer-specific catalogs/pricing, quoting
Experience with payment gateways/processors (Shopify Payments, Stripe, Authorize.net, Adyen, or similar) — auth/capture, refunds, chargebacks, tokenization, PCI-DSS awareness
Prior experience on a platform migration (legacy/custom → SaaS commerce platform), especially with a cutover/parallel-run phase
Familiarity with middleware/iPaaS patterns or tools (custom middleware, MuleSoft, Boomi, Celigo, or similar) even if this build is fully custom
Experience with infrastructure/deployment: Docker, CI/CD, AWS/GCP/Azure, observability (logging, tracing, alerting) for production integration pipelines
Background working with high-volume B2B commerce (large order counts, complex pricing rules, multi-entity/multi-warehouse)
Familiarity with GraphQL schema design for internal middleware APIs
Domain experience in [industry — e.g., wholesale distribution, manufacturing, apparel] if applicable to the brand
Experience with tax engines (Avalara, Vertex) or fulfillment/3PL integrations
Experience with EDI (X12/EDIFACT) for order, invoice, or ASN transactions if SX.e integration relies on it
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