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DL-STB-00 · Stabilize / Recovery

Legacy system modernization without stopping operations

We take over failing, legacy or AI-coded commerce systems, stop the outages first, then modernize component by component while orders keep moving. Rate limits, broken syncs, retired marketplace APIs, abandoned codebases.

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51.4344.0060°02STABILIZEDETAIL 02 · STABILIZE · DL-STB-00

Where legacy system modernization starts

  1. 1.

    Orders stop syncing and nobody can say why

  2. 2.

    Throttling errors and API fees climbing with call volume

  3. 3.

    Code still shaped around retired APIs, such as Amazon MWS, or deprecated endpoints

  4. 4.

    Previous vendor gone: no documentation, no tests, no owner

Marketplace data reaches ERP, WMS and the data store through one integration core with queuing, retries and backoff, driven by event notifications and bulk reports; the old polling cron is shown as the retired path.MARKETPLACESsubscribebulk reportsorder changehealthreplacedMARKETPLACESorders / listingsCHANNEL APISorders / reportsNOTIFICATIONSevents via SQSINTEGRATION COREqueue / retry / backoffLEGACY CRONpolling, retiredERP / WMSfulfilmentDATA STOREreportingMONITORINGalerts / logs
  1. 01MARKETPLACESorders / listingsCHANNEL APISorders / reports
  2. 02CHANNEL APISorders / reportsNOTIFICATIONSevents via SQSsubscribe
  3. 03CHANNEL APISorders / reportsINTEGRATION COREqueue / retry / backoffbulk reports
  4. 04NOTIFICATIONSevents via SQSINTEGRATION COREqueue / retry / backofforder change
  5. 05INTEGRATION COREqueue / retry / backoffERP / WMSfulfilment
  6. 06INTEGRATION COREqueue / retry / backoffDATA STOREreporting
  7. 07ERP / WMSfulfilmentMONITORINGalerts / logshealth
  8. 08DATA STOREreportingMONITORINGalerts / logs
  9. 09LEGACY CRONpolling, retiredCHANNEL APISorders / reportsreplaced
Fig. 02Order pipeline, stabilizedMarketplace data reaches ERP, WMS and the data store through one integration core with queuing, retries and backoff, driven by event notifications and bulk reports; the old polling cron is shown as the retired path.Scale NTS

Detailed services.

Any of them is also available as hours with a senior engineer, when you need a second opinion rather than a project.

What the engagement covers.

  1. 01

    App rescue and takeover

    Failing, inherited or AI-coded apps taken over: incidents stopped first, causes fixed next.

  2. 02

    Scaling and performance

    Database, queues and rate limits reworked so the app holds more load at lower cost.

  3. 03

    Marketplace API migrations and upkeep

    Code moved off retiring marketplace API versions, Amazon SP-API and Ads API included, then kept current.

  4. 04

    Documentation and handover

    Technical documentation and runbooks, so your team can own the system again.

  5. 05

    Senior engineer hours

    Any of these as hours with a senior engineer, when you need a second opinion rather than a project.

How it runs.

  1. P01

    Triage

    Find what is failing, how often, and what it costs the business.

  2. P02

    Contain

    Stop the bleeding: retries, alerts, manual fallbacks where needed.

  3. P03

    Map

    Read the code end to end; document data paths and hidden business rules.

  4. P04

    Rebuild

    Replace weak components one at a time, verified against the old path.

  5. P05

    Hand over

    Documentation, monitoring and ongoing support or a clean handover.

What you get.

ItemDeliverableQty

  1. 01Restored, monitored order and data flows1
  2. 02Root-cause notes for each incident1
  3. 03Modernization plan sequenced by risk1
  4. 04Technical documentation and runbooks1

Stack09

  • Amazon SP-API
  • Walmart Marketplace API
  • Shopify API
  • Notifications API
  • Reports API
  • Amazon SQS
  • AWS Lambda
  • Node.js
  • TypeScript

Related projects.

  1. DL-043Amazon and Walmart API architecture review for an eCommerce SaaSName withheld · Singapore01Audit02Stabilize
  2. DL-056Cross-border API architecture for an Amazon and Walmart US sellerName withheld · Argentina01Audit02Stabilize
  3. DL-014Order automation for an Amazon seller with custom printing productsWraplab · France03Build
  4. DL-009Amazon MWS to SP-API migration for a top 20 sellerBig Fly · USA02Stabilize03Build
  5. DL-001Amazon SP-API optimization for an agencyVaso Group · USA01Audit02Stabilize
All case studies

Questions engineers ask us.

Q01Can you take over code another team wrote?

Yes, that is most of this work. For Wraplab we delivered in a week what previous developers had not shipped in eight months.

Q02Do we have to pause operations during modernization?

No. New components run alongside the old path until their output matches; only then do we switch.

Q03Is this only for Amazon systems?

No. Amazon is a large part of our work, but we stabilize Walmart, Shopify and other marketplace integrations, ERP links, storefronts and internal tools.

Q04What if we just need the fees or the migration fixed?

Both are standalone services: SP-API fees optimization and MWS to SP-API migration.

Related services.

Stop the outages first

Tell us what is breaking and since when. We start with triage, not a sales deck.

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