Custom Warehouse Management APIs and Software for connected warehouse operations.
We build custom warehouse management systems and APIs for warehouse operators and software teams.
Keep and extend the WMS you run, or build a custom system around your warehouse workflow.
- 120+Projects delivered across 12 countries since 2012
- 100+Senior in-house engineers, six countries
- 5.0Unified rating across 61 client reviews on Clutch
- 2 to 4 weeksTypical time from signature to start
- ISTQBISTQB-certified QA engineers
- ISO 27001Certified security practice, audited by Quay Audit UK
01Overview
Warehouse software from receiving to dispatch
Custom warehouse management software directs work from receiving through dispatch and records what happens to stock. Warehouse APIs share stock and order data with the surrounding systems, connecting the building to the wider logistics and transportation operation.
- Receive and put awayFrom the truck at the dock to stock in a recorded warehouse location.
- Inbound and ASN handling
- Putaway and location rules
- Cross-docking and returns
- Store, count and pickInventory movements and adjustments, recorded where the work happens.
- Inventory and location control
- Cycle counting and adjustments
- Pick, pack and dispatch
- Warehouse data exchange and GDPRStock and order records shared with the rest of the operation. We agree access and retention for identifiable staff data, including scanner logins and pick rates.
- REST APIs and webhooks
- EDI: 856 ASN, 940, 945
- GS1 barcodes and SSCC labels
- Shared warehouse application componentsIn one warehouse software project, we built frontend components shared across 15+ applications.
02Compare
Extend the WMS you run, or replace it
The WMS's fit for the floor and access to its data are separate questions. We review both before recommending an interface project or a replacement.
| Warehouse situation | Work to scope | The route that fits |
|---|---|---|
| “Nothing can read the WMS without a nightly file.” | Stock data outside the nightly batch | An API layer in front of the system you already run: read models first, then the writes your partners need.Platform development and integrationOr book a meeting |
| “The WMS is fine. It is the reporting people complain about.” | Reporting, with the WMS retained | Keep the WMS and build a reporting layer over its data. Floor workflows remain in the existing system.Reporting and data engineeringOr book a meeting |
| “The website says two in stock and the shelf says none.” | Stock counts and reservations across channels | One stock service both sides read, with reservations and a reconciliation path that checks and explains any difference in counts.Where this bites in e-commerceOr book a meeting |
| “Everything the warehouse produces is re-keyed into the ERP.” | Warehouse events posted to the ERP | A custom integration layer posts warehouse movements to the ERP from the events recorded by the WMS.Custom ERP for logisticsOr book a meeting |
| “No WMS we have seen handles the way we actually pick.” | Picking rules and the supporting data model | Build a custom WMS around the picking rules and data model your warehouse needs.How we build custom systemsOr book a meeting |
When your WMS works and other systems need its data, we build an API layer in front of it. The layer is reversible and goes in without stopping warehouse work. Where your picking logic is how you compete, we build a custom WMS.
Ihor PrudyvusDelivery Director, unicrew03Solutions
Warehouse management software development and integration
Choose a warehouse workstream that can ship as a useful release, with the stock and order interfaces it depends on.
A documented interface over stock, orders, movements and events, with read access delivered before write paths.
- Right when
- A working WMS needs an external interface
Receiving through dispatch, built around your layout, your SKUs and your peak, when no packaged option fits.
- Right when
- Your picking logic is how you compete
One stock service the storefront, the marketplace and the floor all read, with reservations and a reconciliation path.
- Right when
- Two systems hold two stock numbers
EDI documents in and out, ERP postings driven by warehouse events, carrier APIs for rates, labels and status.
- Right when
- Orders arrive by file and leave by hand
Barcode and mobile flows designed around gloves, cold stores and a device that has to survive a shift.
- Right when
- Staff need mobile warehouse workflows
We report stock accuracy, pick rates, dwell and exceptions on a schedule your team can plan against. Chain of custody trails and exception and audit logs keep warehouse activity traceable.
- Right when
- The weekly number is assembled by hand
How we take access, and what we are certified in
Contracts and NDAs come first. On warehouse builds, we agree least-privilege access with your technical contact, read-only wherever the work allows, with no production write access during discovery. unicrew has ISTQB-certified QA engineers and holds ISO 27001:2022 and ISO 9001:2015, renewed through a multi-stage audit with Quay Audit UK.
04Stack
The stack for warehouse systems and their integrations
We use the development stack for warehouse applications and APIs, with ERP integrations scoped against the platforms your operation retains.
Angular
React
Storybook
iOS
Android
- REST API
ASP.NET- ASP.NET MVC
- .NET
Java
PHP
AWS
Azure
Odoo- ePROMIS
- Microsoft Dynamics 365
Sage 300- NetSuite
05Delivery
How we phase a warehouse engagement
We agree the warehouse release schedule with the people running the floor, including operating peaks and the checks staff need before accepting a change.
- Walk the floor, then read the interfacesWe observe receiving, picking and cycle counts with staff, including exceptions handled outside the standard flow. Then we trace the same activity through the WMS database, ERP and the files between them.You getA map of the operation and every interface it leans on
- Deliver a read-only first releaseWe build a read-only stock view, exception report or API against live data first. Comparing its counts and events with the current system establishes the baseline before write paths go live.You getA read-only interface running against your live data
- Write paths, one area at a timeWrite paths go live by area or wave, alongside the current process while staff check the resulting counts and events. We schedule releases outside peak and keep the old path available.You getWorking software in one area, with the old path intact
- Cutover, then hand overWe complete the remaining areas, retire the parallel process at cutover and hand over the runbook to the staff who operate the system, including the night shift.You getA system your own team can run, and the runbook for it
06Proof
Warehouse interfaces in delivered logistics products
For a warehouse-software team, the purchase may be a product interface and backend integration. Our Bitergo work demonstrates that scope.
- A warehouse software company's own productFor Bitergo in Dortmund, the warehouse-software company behind the cloud WMS Warehouse Star, we rebuilt its Business App Store front-end on Angular, with Storybook components shared across 15+ applications, then integrated the backend over REST. Managing director Andreas Trautmann writes in his 2022 Clutch review: "After launching the site we saw a rapid increase of test accounts ordered by potential customers" and "Now the site provides a steady source of sales leads".15+apps sharing the component set we built
- A moving order system from lead to accountingIn his 2022 review, MiniMoves CFO and VP of IT Jeff Sides describes the order management system we worked on in Chicago, which "handles everything from lead management to accounting". He writes that the enhancements "increased productivity and allowed us to maintain double digit growth without a substantial increase in staffing". Related freight work includes the Mover Technologies quote platform, which pulls carrier API data.Double digitgrowth held without a substantial increase in staffing
- A custom logistics platform with container dataCloud Van Lines in Boston: a SaaS for household moves. In his 2019 review, CEO Jeff Chizmas writes: "Artelogic wrote the platform from scratch", "We started the project in December 2016", and "the platform is integrated with smart containers that allow users to get data and information on their shipping containers, like the location at any given time". He is describing work done under our former Artelogic brand.2016the year this build started, in the client's words
07Case studies
Warehouse interfaces and connected logistics systems
The project scope can preserve a warehouse product's backend while changing its frontend, or cover a complete logistics platform.
See all case studies
LogisticsApp Store for warehouse managementOur client Bitergo offers a collection of business apps to optimize warehouse management, scalable from start-ups to 4PL companies. The client decided to upgrade the front-end of all its applications to the latest version of Angular.Rapid increaseOf test accounts ordered by potential customers after the site launched
LogisticsMiniMoves Order Management PlatformA custom-built moving order system that simplifies booking, boosts automation, and improves operational efficiency.Double-digit growthMaintained without a substantial increase in staffing
LogisticsCustom software for a US moving companyAn end-to-end SaaS platform for managing household moves and every business operation of a logistics company.Built from scratchAn end-to-end SaaS for household moves and the operations behind them
08Questions
Questions buyers ask before they commit
Supply chain management plans the flow of goods; the WMS directs warehouse work and records what happens to stock.
Warehouse APIs share those stock, order and movement records with the ERP, storefront and carriers. That connection keeps warehouse activity part of the wider operation.
Extend the WMS when its stock records and floor workflows fit, and the change concerns reporting, integration or access to its data.
Review replacement when the data model cannot support the workflow, the platform is no longer maintained, or your picking logic calls for a custom system. We scope that choice against the warehouse layout, SKU rules and operating peak.
Yes. We build warehouse APIs around existing WMS platforms.
We start with a documented read API over stock, orders, movements and events, then develop the write paths your partners need. Where the WMS has no usable interface, we build against its database or file drops.
The interface is versioned separately from the WMS. Upgrade work is scoped against the data formats and interfaces it uses.
Yes. We connect warehouse events to the ERP and the partner interfaces around it.
- Trading-partner documents: advance ship notices and warehouse shipping orders and advice, including EDI 856, 940 and 945.
- Warehouse identifiers: GS1 barcodes and SSCC pallet labels.
- Carrier APIs: rates, labels and status.
ERP postings are driven by warehouse events. We configure, extend and connect Odoo, ePROMIS, Microsoft Dynamics 365, Sage 300 and NetSuite.
We price warehouse software against the system or interface in scope. A read-only stock API and a custom multi-site WMS are different projects.
- Time and materials: billed hourly, quoted per project.
- Fixed price: quoted per project against an agreed outcome.
- Team extension: billed monthly per team member.
We recommend the model after discovery. Team extension carries no recruitment or placement fee. Fixed-scope work includes a post-launch warranty, with its length agreed in the contract.
Most engagements start within two to four weeks of signature. Delivery follows the warehouse operating schedule.
We agree the cutover quarter at scoping, around your peak. A read-only interface comes first; write paths follow by area alongside the existing process. Releases are scheduled outside peak, with the delivery milestones set separately from the start window.
For warehouse builds, we agree least-privilege access with your technical contact before work starts.
Contracts and NDAs come first. Access is read-only wherever the work allows, with no production write access during discovery. We work inside your cloud where customers, insurers or shippers require it.
unicrew has ISTQB-certified QA engineers and holds ISO 27001:2022 and ISO 9001:2015, renewed through a multi-stage audit with Quay Audit UK. Staff data, including scanner logins and pick rates, makes GDPR retention part of the data model we scope early.
Plan your next warehouse system or interface
Review your warehouse workflow and current WMS with a senior engineer who has delivered warehouse and order-platform work. We recommend a scoped build, extension or integration.
What happens after you contact us
- We reply within one business dayShare the warehouse workflow and the platforms you want to connect.
- A call about the floorWe review stock and order flows, existing interfaces and the work planned for the next release.
- Route and engagement model, in writingExtend, integrate or build, priced as time and materials, fixed price, or team extension.
- NDA, then discoveryMost engagements start within two to four weeks of signature.