Most warehouse operations carry more complexity than a packaged WMS can cleanly handle — non-standard putaway logic, multi-client inventory, deep ERP dependencies, or scanning workflows that do not map to an off-the-shelf product. Perimattic builds custom warehouse management systems engineered to the specific workflows, location structures, and integration landscape of the operation: receiving through despatch, scan-confirmed at every step, connected to ERP and carrier systems throughout.
WMS Technology Stack — Node.js, Python, AWS, PostgreSQL, Kafka, Docker, React, Kubernetes, REST APIs, Redis, TypeScript, GraphQL
Warehouse management system development is the design, engineering, integration, and support of software platforms that automate and control warehouse operations. A WMS manages the full warehouse workflow — receiving and goods-in, putaway and location assignment, inventory visibility across bin and location levels, wave and batch picking, scan-confirmed packing, carrier booking and despatch, returns handling, and cycle counting — and connects these operations to ERP, order management, carrier, and third-party logistics systems. Unlike off-the-shelf WMS products, a custom warehouse management system is built around the specific warehouse layout, handling rules, location structures, and integration dependencies of the operation rather than requiring the warehouse to adapt to a packaged product.
The challenge with most warehouse operations is that inventory accuracy and operational throughput depend on software that matches the physical reality of the warehouse. When the WMS does not support the putaway logic the warehouse actually uses, operatives work around the system. When the pick interface does not match the warehouse zone structure, walk paths are inefficient. When the ERP integration is a batch reconciliation rather than an event-driven connection, inventory positions drift and orders are allocated against stock that is not physically available. The gap between what the WMS was designed to do and how the warehouse actually operates shows up as inventory discrepancies, pick errors, delayed despatches, and manual workarounds that erode the efficiency gains the system was installed to deliver.
Perimattic builds custom WMS platforms that start from the warehouse operation — the physical layout, the handling rules, the location structures, the carrier integrations — rather than from a packaged product's feature set. Every engagement begins with a thorough discovery of the existing operation before any platform decisions are made. We design integration architectures that connect the WMS to ERP and order management systems through structured, maintainable interfaces. We build the mobile scanning layer that captures inventory movements at the point they occur. And we deliver in phases, testing each workflow against real operational conditions before production deployment.
Inventory accuracy
Batch stock reconciliation at end of shift — inventory positions lag physical reality by hours, causing order allocation errors and manual corrections
Inventory accuracy
Real-time inventory updates at point of movement — scan at goods-in, putaway, pick, and despatch drives immediate stock position accuracy
Receiving and putaway
Paper-based receiving with manual bin allocation decisions — goods misplaced, purchase order matching done retrospectively by stock count
Receiving and putaway
Scan-confirmed goods-in with automated directed putaway logic — stock goes to the correct location the first time, PO matching is immediate
Picking accuracy
Pick errors identified at the packing bench or — worse — after despatch, requiring costly returns and re-despatch
Picking accuracy
Scan-confirmed picking with real-time exception alerting — pick errors are caught at the pick event, before they reach packing
System integration
Manual re-keying of orders and inventory movements between WMS, ERP, and OMS — error-prone, delayed, and dependent on individual operatives
System integration
API and event-driven integration across ERP, OMS, and carrier systems — order receipt, fulfilment confirmation, and inventory valuation happen automatically
Warehouse analytics
Weekly throughput and accuracy reports assembled manually from system exports — data describes last week rather than current operational state
Warehouse analytics
Live operational dashboards covering throughput, pick accuracy, receiving volumes, and labour productivity — from WMS event data in real time
The operational cost of a WMS that does not match the warehouse becomes visible in pick error rates, inventory discrepancies at period-end, carrier booking failures, and the proportion of management time spent reconciling what the system shows against what is physically in the warehouse.
Seven WMS capability areas covering the complete warehouse operation — from custom platform development and receiving through inventory management, picking, fulfilment, analytics, and legacy modernisation.
End-to-end development of bespoke warehouse management platforms engineered to your specific warehouse layout, location structure, handling rules, and operational workflows. Built around how your warehouse actually operates — not around the constraints of a packaged WMS product that requires your operation to conform to its model.
Goods-in and receiving workflows with purchase order matching, discrepancy logging, quality hold processing, and scan-confirmed receipt. Directed putaway logic assigns stock to the optimal location based on product attributes, zone rules, and current capacity — eliminating manual bin allocation decisions and reducing misplace events.
Real-time bin and location-level inventory management across multi-zone, multi-level warehouse structures. We build the location master, zone configuration, capacity rules, and the event-driven update architecture that keeps stock positions accurate at the point of movement — goods-in, putaway, pick, replenishment, cycle count, and despatch — rather than through batch reconciliation.
Wave and batch picking workflows with scan-confirmation at each pick event, reducing pick errors before they reach the packing bench. We build the task management layer that sequences picking instructions optimally by zone and walk path, the packing confirmation interface that validates contents against the order, and the label generation integration with carrier systems.
Order fulfilment orchestration connecting order management, picking, packing, and despatch into a single automated workflow. We build the carrier booking integration for label generation and collection scheduling, the despatch confirmation events that update OMS and ERP, and the exception handling that flags short picks, damaged goods, and carrier booking failures before they become customer problems.
Operational dashboards and management reporting covering throughput, pick accuracy, receiving volumes, putaway efficiency, labour productivity, and despatch performance — built from WMS event data in real time rather than assembled from system exports. We build the data pipelines, aggregation layer, and reporting interfaces that give operations managers actionable visibility without manual data preparation.
Integration of custom WMS platforms with ERP (SAP, Oracle, Dynamics, ERPNext), order management systems, e-commerce platforms, carrier APIs, and third-party logistics systems. For existing WMS platforms constrained by age or architecture, we assess the current system and design an incremental modernisation path — adding API layers, migrating specific modules, or replacing the platform in phases while maintaining warehouse operations throughout.
A structured six-stage process from free warehouse operations discovery through production deployment and ongoing platform support.
We map your existing warehouse operations, system landscape, integration dependencies, location structure, and operational pain points. This free session establishes a clear picture of current-state workflows — receiving, putaway, picking, packing, despatch — before any WMS architecture decisions are made.
We document the target warehouse workflows in detail — goods-in, putaway rules, zone configuration, pick strategies, packing processes, despatch, and returns. We identify all integration dependencies with ERP, OMS, carrier, and third-party systems and produce a phased delivery roadmap.
We design the WMS platform architecture and build a proof of concept against the highest-risk component — typically the primary ERP integration or real-time inventory event processing pipeline — to validate the approach and surface any data or technical risks before full development investment begins.
We develop the WMS incrementally, delivering working warehouse workflows at each phase. We build and integrate the platform with ERP, order management, carrier, and third-party logistics systems, implementing barcode scanning interfaces and mobile workflows throughout.
We test the WMS against real warehouse scenarios including peak volume conditions, scanning failure modes, integration edge cases, and exception handling in picking and despatch. We run user acceptance testing with warehouse operations teams before any production go-live.
We deploy to production with CI/CD pipelines, infrastructure monitoring, alerting, and operational runbook documentation. We support the post-deployment period and offer engineering retainers for ongoing WMS evolution, feature development, and performance optimisation.
We map your existing warehouse operations, system landscape, integration dependencies, location structure, and operational pain points. This free session establishes a clear picture of current-state workflows — receiving, putaway, picking, packing, despatch — before any WMS architecture decisions are made.
We document the target warehouse workflows in detail — goods-in, putaway rules, zone configuration, pick strategies, packing processes, despatch, and returns. We identify all integration dependencies with ERP, OMS, carrier, and third-party systems and produce a phased delivery roadmap.
We design the WMS platform architecture and build a proof of concept against the highest-risk component — typically the primary ERP integration or real-time inventory event processing pipeline — to validate the approach and surface any data or technical risks before full development investment begins.
We develop the WMS incrementally, delivering working warehouse workflows at each phase. We build and integrate the platform with ERP, order management, carrier, and third-party logistics systems, implementing barcode scanning interfaces and mobile workflows throughout.
We test the WMS against real warehouse scenarios including peak volume conditions, scanning failure modes, integration edge cases, and exception handling in picking and despatch. We run user acceptance testing with warehouse operations teams before any production go-live.
We deploy to production with CI/CD pipelines, infrastructure monitoring, alerting, and operational runbook documentation. We support the post-deployment period and offer engineering retainers for ongoing WMS evolution, feature development, and performance optimisation.
Select a sector to see how we design, build, and integrate warehouse management systems for enterprise warehouse and fulfilment operations.
Retailers and e-commerce operators require WMS platforms that handle high order volumes across multiple fulfilment locations — with real-time inventory visibility, scan-confirmed picking, and direct integration with order management and carrier systems.
Retailers and e-commerce operators require WMS platforms that handle high order volumes across multiple fulfilment locations — with real-time inventory visibility, scan-confirmed picking, and direct integration with order management and carrier systems.
Third-party logistics operators manage multiple client accounts, mixed inventory, and complex billing structures — requiring WMS platforms with strict client isolation, automated charge calculation, and high-volume scanning operations.
Manufacturers need WMS platforms that connect raw material receipt and storage with production scheduling, component kitting, and finished goods despatch — integrated with ERP and production systems throughout.
Food and grocery warehousing operates under strict lot traceability, FEFO rotation, temperature zone management, and short shelf-life constraints — making a purpose-built WMS essential for compliance and waste reduction.
Pharmaceutical and medical device warehousing operates under stringent serialisation, controlled substance, and cold chain requirements — requiring WMS platforms built to regulatory standards from the ground up.
Distributors and wholesalers manage large SKU ranges, complex customer pricing, and high inbound volumes from multiple suppliers — requiring WMS platforms that handle multi-vendor goods-in, bulk storage, and high pick accuracy at volume.
Perimattic's work resulted in stable production systems. The team was helpful, easily accessible, and communicative through email. Their professionalism was impressive.
Quality
4.5
Schedule
5.0
Cost
5.0
Willing to Refer
4.5
DevOps Managed Services · Oct 2023 – Aug 2024
24/7 monitoring and support for production environments plus Linux server administration for a leasing automation company.
The new architecture is scalable and highly efficient, saving a lot of money in fees. Perimattic provides high-quality IT consulting and cloud development work promptly and at great value. The team remains involved from the planning stage to providing support, showing diligence and proactiveness.
Quality
5.0
Schedule
5.0
Cost
4.5
Willing to Refer
5.0
AWS Migration (Legacy → Microservices) · Nov 2018 – Ongoing
Transitioned a travel systems company's legacy server system to an AWS-based microservices architecture with ongoing maintenance.
Four structural advantages that separate warehouse management systems built for real operational environments from platforms that work in a demo but fail under production warehouse conditions.
Every WMS engagement begins with a thorough mapping of your existing warehouse operations, location structures, handling rules, and integration landscape. We understand how your warehouse actually runs before designing software for it. This prevents the most common WMS failure mode: a technically correct platform that does not match the operational workflows, zone structures, or exception handling patterns of the physical warehouse.
A WMS is only operationally valuable when it is correctly connected to the systems around it — ERP for inventory valuation and purchase orders, OMS for order receipt and fulfilment confirmation, and carrier systems for label generation and tracking. We design structured integration architectures with proper error handling, retry logic, and reconciliation rather than fragile point-to-point connections that fail silently under operational load.
Real-time inventory accuracy in a warehouse depends on capturing movements at the point they occur — goods-in, putaway, pick, pack, despatch — through scanning at each step. We build the mobile scanning interfaces, task management workflows, and event-driven inventory update architecture that keep stock positions accurate without batch reconciliation runs or manual corrections. Scanning is designed into the platform from the start, not bolted on later.
The team that maps your warehouse workflows and designs the WMS architecture also builds, tests, and deploys it. There is no handoff between a consulting team and a delivery team, no loss of operational context between discovery and implementation. You work with the same engineering team from the initial warehouse operations review through production deployment and post-launch support.
“A warehouse management system that works correctly in a controlled test environment but generates pick errors, inventory discrepancies, or integration failures under real operational load is not a successful deployment — it is a problem deferred to your operations team.”
Warehouse management system development is the design, engineering, integration, and ongoing support of software platforms that manage and automate warehouse operations. A custom WMS controls the full warehouse workflow — receiving, putaway, bin and location management, picking, packing, despatch, returns, and cycle counting — and integrates these processes with ERP, order management, carrier, and third-party logistics systems. Unlike off-the-shelf WMS products, a custom warehouse management system is engineered to the specific warehouse layout, handling rules, operational workflows, and integration requirements of the business rather than requiring the warehouse to adapt to a packaged product's constraints.
Off-the-shelf WMS platforms cover standard warehouse workflows well but impose their own data models, location structures, and integration patterns on the operation. Warehouses with non-standard layouts, complex putaway logic, multi-client inventory separation, custom billing requirements, or deep ERP integrations frequently find that packaged WMS platforms require significant customisation to match actual operational needs — or force costly operational compromises. A custom WMS is built around the specific warehouse layout, handling rules, and integration landscape, and evolves as the operation changes without dependency on a vendor's product roadmap or licensing model.
A custom WMS can manage the complete warehouse operation: goods-in and receiving with purchase order matching, directed putaway with location assignment rules, bin and location management across multi-zone and multi-level storage, pick face replenishment, wave and batch picking, packing with scan confirmation, despatch with carrier label generation and collection booking, returns handling with quality inspection and stock reinstatement, cycle counting and stock reconciliation, and labour and task management. The scope of the WMS is defined by the specific operational requirements discovered during the engagement rather than constrained by the features of a packaged product.
Yes. ERP integration is a core component of almost every WMS development engagement. We design and build structured integration layers — using REST APIs, event-driven messaging, and middleware — that connect the WMS with SAP, Oracle, Microsoft Dynamics, ERPNext, and other enterprise platforms. The integration typically covers purchase order receipt, goods-in confirmation, inventory movement events, stock valuation updates, and outbound despatch confirmation. We handle authentication, data mapping, error handling, and retry logic, and we always begin with a thorough discovery of the existing integration landscape before designing the target architecture.
Yes. Multi-warehouse management is a common requirement for WMS development engagements. A custom WMS can manage inventory across multiple warehouse sites with centralised visibility, site-specific operational rules, and cross-location stock allocation. The platform can support different putaway strategies, picking workflows, and ERP integrations per site while providing consolidated reporting and inventory visibility across the full warehouse network. Order allocation rules can route fulfilment to the optimal site based on stock availability, proximity, or service level requirements.
Yes. Barcode scanning and RFID integration are standard components of custom WMS development. For barcode-based operations, we build mobile scanning applications for goods-in, putaway, picking, packing, and despatch — typically using handheld scanners or mobile devices running a browser-based or native scanning interface. For RFID-enabled operations, we integrate with RFID reader infrastructure to capture location updates and inventory movements without manual scan events. The data capture layer drives real-time inventory updates, ensuring stock positions remain accurate at the point of movement rather than through batch reconciliation.
Yes. Legacy WMS modernisation is often a more practical path than full replacement, particularly where the existing system holds significant operational data or where a full cutover carries unacceptable operational risk. We assess the existing system to identify which components are sound and which are constraining the operation, and design a modernisation path that delivers value at each phase. This may involve adding API layers to legacy systems to enable integration with modern platforms, migrating specific workflows to a new platform while retaining stable legacy components, or replacing the full system incrementally with parallel operations during transition.
Real-time inventory visibility in a WMS depends on capturing inventory movements at the point they occur — scanning at goods-in, putaway confirmation, pick confirmation, pack confirmation, and despatch — rather than updating inventory in batch at the end of a shift or day. We design and build the full stack: the mobile scanning and task management layer that captures events, the event-driven processing architecture that updates inventory records immediately, and the reporting and visibility layer that makes current stock positions available to operations, planning, and customer service teams. The result is inventory data that reflects the current physical state of the warehouse without manual reconciliation.
Yes. Integration with order management systems and e-commerce platforms is a standard part of WMS development. We build the integration layer that receives orders from OMS, e-commerce platforms (Shopify, Magento, custom platforms), and marketplace channels, routes them to the WMS for pick and despatch, and returns fulfilment confirmation and tracking data. We handle the authentication, data mapping, and error handling across all integration points. For multi-channel operations, the WMS can receive orders from multiple sources and apply consistent picking and despatch workflows regardless of order origin.
We follow a structured six-stage process: a free discovery and scoping session to map your existing warehouse operations, systems, and integration landscape; a workflow mapping and systems audit phase that documents current and target state in detail; a WMS architecture and proof-of-concept phase that validates the highest-risk component before full development begins; platform development and integration; testing and warehouse user acceptance against real operational scenarios; and production deployment with monitoring, runbook documentation, and ongoing support. We deliver working software at each phase so you can validate progress against operational requirements throughout rather than only at the end of the engagement.
Tell us about your warehouse operations — the current systems, the workflows that don't fit what you have, and the integrations that are creating manual work. We will show you exactly how a custom WMS platform can replace the workarounds with automated, scan-confirmed workflows connected to your ERP and order management systems.