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DL-BLD-00 · Build / Engineering

Build on a foundation that holds

Engineers who extend what already works, on every channel you sell on: integrations with Amazon, Walmart, eBay, Allegro, Mercado Libre and Shopify, SaaS products for sellers and agencies, and automation for custom-product orders. For Amazon data pipelines and AI agents there is DataDoe, our product.

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51.4344.0060°03BUILDDETAIL 03 · BUILD · DL-BLD-00

When to bring in marketplace engineers

  1. 1.

    Off-the-shelf tools stop where your process starts.

  2. 2.

    Marketplace, store and ad data never meet in one place.

  3. 3.

    A freelancer's integration breaks on the next API change.

  4. 4.

    Daily operations still run on manual exports and copy-paste.

Marketplace and store APIs (Amazon, Walmart, Shopify and others), or DataDoe's unified Amazon schema, feed one build layer that delivers integrations, extraction pipelines, custom applications and automations.SOURCESWHAT WE DELIVERorders, listings, reportsorders, catalogueunified schemaMARKETPLACE APISAmazon / Walmart / eBaySTORE APISShopify / own storeDATADOEMCP / API / BigQueryBUILD LAYERYour rules, our codeINTEGRATIONSERP / WMS / CRMPIPELINESWarehouse / BIAPPLICATIONSTools / SaaS / agentsAUTOMATIONSTriggers / jobs
  1. 01MARKETPLACE APISAmazon / Walmart / eBayBUILD LAYERYour rules, our codeorders, listings, reports
  2. 02STORE APISShopify / own storeBUILD LAYERYour rules, our codeorders, catalogue
  3. 03DATADOEMCP / API / BigQueryBUILD LAYERYour rules, our codeunified schema
  4. 04BUILD LAYERYour rules, our codeINTEGRATIONSERP / WMS / CRM
  5. 05BUILD LAYERYour rules, our codePIPELINESWarehouse / BI
  6. 06BUILD LAYERYour rules, our codeAPPLICATIONSTools / SaaS / agents
  7. 07BUILD LAYERYour rules, our codeAUTOMATIONSTriggers / jobs
Fig. 03From marketplace APIs to working systemsMarketplace and store APIs (Amazon, Walmart, Shopify and others), or DataDoe's unified Amazon schema, feed one build layer that delivers integrations, extraction pipelines, custom applications and automations.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

    Marketplace integrations

    Amazon, Walmart, Shopify and other channels connected to your ERP, WMS and accounting, both ways.

  2. 02

    Marketplace SaaS development

    Multi-tenant products for sellers and agencies, up to a public Appstore listing. You own the code.

  3. 03

    Custom product and print-on-demand automation

    Personalized orders turned into print-ready files, batched sheets and labels automatically.

  4. 04

    Data pipelines and AI agents

    For Amazon data, BI and AI agents we point you to DataDoe, our product.

  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

    Discovery

    A call to understand the process, the systems involved and what the software must do.

  2. P02

    Estimate

    Scope, timeline and cost in writing, so expectations are fixed before work starts.

  3. P03

    Build

    Iterative development and testing, with progress reported by a dedicated project manager.

  4. P04

    Support

    Training, maintenance and new features as the business and the marketplaces' APIs change.

What you get.

ItemDeliverableQty

  1. 01Production software running against live marketplace accounts1
  2. 02Full source code, scripts and project files, owned by you1
  3. 03Documentation and handover to your team1
  4. 04Optional maintenance plan1

Stack13

  • Amazon SP-API
  • Amazon Ads API
  • Walmart Marketplace API
  • Shopify API
  • Mercado Libre API
  • DataDoe
  • Model Context Protocol (MCP)
  • Node.js
  • TypeScript
  • Next.js
  • AWS Lambda
  • PostgreSQL
  • Google Sheets

Related projects.

  1. DL-021One integration hub for an apparel manufacturer's sales channelsName withheld · US East03Build02Stabilize
  2. DL-016Adding Walmart to a SaaS built for Amazon sellersName withheld · US South03Build
  3. DL-050Mercado Libre and Amazon Brazil integration with SAP Business OneName withheld · Brazil03Build02Stabilize
  4. DL-048Unified commercial data layer for Shopee, Lazada and TikTok ShopName withheld · Thailand03Build
  5. DL-003Acorn: SaaS for Amazon sellersGreenwald Brands · USA03Build
  6. DL-002FBM and FBA Amazon orders automationHisco Inc. · USA02Stabilize03Build
All case studies

Questions engineers ask us.

Q01Who owns the software after you build it?

You do. Once the project is delivered, you legally own everything needed to run, maintain or extend it: source code, scripts, project files and executables.

Q02What does a custom build cost?

It depends on complexity, the systems to integrate and the support you need. Past projects ranged from $7,000 to hundreds of thousands of dollars. We quote in detail after a free discovery call.

Q03Can you build on DataDoe instead of the raw SP-API?

Yes. DataDoe, a Deltologic product, already joins Seller Central, Vendor Central and Amazon Ads in one schema, reachable through MCP, a REST API and BigQuery. Building on it skips the SP-API plumbing; where it doesn't cover what you need, we build on Amazon's APIs directly.

Q04Do you maintain the software after launch?

Yes, through flexible maintenance packages. If you decide you don't need support, that's fine too: the code is yours.

Q05We have an idea but not the full feature list. Can you help define it?

Yes. We run workshops of 16 to 80 hours to work through the functionality with you and design the concept before anything is built.

Q06Our project is not about marketplaces or e-commerce. Can you still help?

Yes. Marketplace commerce is our specialisation, but we also build for logistics, agriculture, automotive and other industries.

Related services.

Scope your build

Tell us what the system must do. We come back with a concept, an estimate and a timeline.

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