Warehouse Management Software Development
Custom warehouse management software that fits your warehouse, not the other way around.
A 3PL billing clients by the pallet while the WMS only understands per-unit pricing loses revenue every billing cycle. A cold-chain warehouse logging temperatures on paper because the software has no concept of zones is one failed audit away from a lost contract. These aren't staffing problems — they're software-fit problems, and this page is about the fit.
RaftLabs builds custom warehouse management software for 3PLs, distributors, and manufacturers running specialized warehouses: cold chain, multi-client, high-SKU, or all three. Receiving, putaway, picking, and shipping built around your layout and your workflows, integrated with your ERP and carriers. Fixed price. No per-user SaaS seat fees.
Receiving, putaway, picking, and shipping modelled on your actual layout, not a generic template
Barcode and RFID scanning on rugged devices, designed for gloved hands and spotty warehouse Wi-Fi
Multi-client 3PL billing: per-pallet, per-unit, per-order, or blended, per client contract
Native integration with your ERP, carriers, and EDI trading partners
No per-user SaaS seat fees at any headcount: you own the platform outright
Bring the problem, the current workflow, or the existing code. We reply with a practical next step within one business day.
Trusted by
The brief
Start with what is not working.
Good software decisions begin with the constraint, not a list of features or a preferred technology.
Billing 3PL clients by the pallet while the WMS only understands per-unit pricing, so invoices get built in spreadsheets?
A cold-chain operation logging temperatures on paper because the software has no concept of temperature zones?
Pickers walking past the fastest-moving SKUs because the slotting logic was designed for someone else's warehouse?
Plain answer
RaftLabs builds custom warehouse management software for 3PLs, distributors, and manufacturers across the US, UK, Ireland, and Australia. A focused v1 covering receiving, putaway, picking, and shipping with barcode scanning launches in about 16 to 20 weeks from around $60,000, then grows into multi-client 3PL billing, cold-chain compliance, and ERP integration. The core fit: specialized warehouses — cold chain, 3PL, and high-SKU manufacturing.
What to remember
- A focused v1 launches in about 16 to 20 weeks from around $60,000, then grows into 3PL billing, cold-chain compliance, and automation
- Built for specialized warehouses: cold chain, multi-client 3PL, high-SKU manufacturing, where generic WMS falls short
- No per-user SaaS seat fees: you own the platform outright after delivery
- Multi-client billing with per-client rate cards: per-pallet, per-unit, per-order, or blended, posted automatically
- Integrates with ERP, carriers, and EDI trading partners, including SAP, NetSuite, and Microsoft Dynamics 365
Your warehouse is not the average warehouse.
The SaaS WMS was designed for the average warehouse. Yours has three temperature zones, fourteen 3PL clients on different rate cards, and a slotting logic the pickers worked out over a decade. None of that is in the product.
So billing gets built in spreadsheets, temperature logs live on paper, and pick paths ignore the velocity data. A custom WMS starts from your floor and builds up.
A warehouse manager who cannot trust the inventory count is deciding on stale data. A 3PL billing team rebuilding invoices in spreadsheets because the WMS only understands one pricing model is losing revenue every billing cycle. A cold-chain operation logging temperatures on paper is one failed audit away from a lost contract. These are software-fit problems, and they are exactly where off-the-shelf WMS breaks down.
A generic WMS handles the standard case well: one client, ambient temperature, standard pick-pack-ship. The moment the operation gets specific, the gaps appear. Multi-client 3PL billing with per-client rate cards. Cold-chain zones where a temperature excursion has to trigger a quarantine hold automatically. High-SKU slotting where fast movers end up in the far aisle because the template never learned your velocity data — and your pickers pay for it in footsteps every shift. Per-user seat fees that scale past any reasonable value on a 100+ person operation. Each gap gets a workaround, and the workarounds compound until the team spends more time feeding the system than the system saves them.
RaftLabs builds warehouse management software for the operations that outgrow the standard case: 3PLs with multi-client billing, food and pharma distributors running cold chain, and manufacturers with high-SKU, high-velocity floors. Receiving, putaway, picking, and shipping modelled on your actual layout. Barcode and RFID scanning that survives the floor, not the demo room. ERP, carrier, and EDI integrations that remove double entry instead of adding it. Fixed price, no per-user seat fees, and you own the platform outright at handover. RaftLabs is rated 4.9 out of 5 by clients on Clutch.
Where generic WMS breaks down
Generic warehouse software fails in predictable places. We scope for these in week one, before a single screen is designed.
- Multi-client 3PL billing
- A SaaS WMS built for single-tenant operations has one pricing model. A 3PL has fourteen clients on fourteen rate cards: storage per pallet per day for one, handling per unit for another, blended per-order pricing for a third. We build per-client rate cards into the WMS core, so every storage and handling charge posts automatically against the right contract. Invoicing stops being a spreadsheet project and becomes a report.
- Cold-chain zones and quarantine
- Temperature is not metadata in a cold-chain warehouse; it is the product. We model temperature zones as first-class entities in receiving and putaway, log readings against the zone on a schedule, and trigger automatic quarantine holds when a reading drifts outside the safe band. The hold blocks the affected pallets from picking until QA releases them. Auditors get a complete temperature trail without anyone touching paper.
- Slotting that matches the floor
- Pick-path efficiency lives or dies on slotting. Generic slotting rules put the fastest-moving SKUs wherever the template says. We build slotting around your velocity data, weight constraints, and the pick paths your team already walks, then keep it current with periodic re-slotting recommendations as demand shifts.
- The seat-fee trap
- Commercial WMS platforms charge per user, and a warehouse runs on people: pickers, packers, receivers, supervisors, plus seasonal temp labour. On a 100+ person operation the arithmetic is unforgiving: even at $100 per user per month, that is $120,000 a year for software you never own. A custom platform has no per-user fees. The build pays for itself against the subscription, and the platform is yours.
What a custom WMS build looks like
The build follows the operation, not the other way around. Week 1 is an operations audit: we walk your floor, map receiving through shipping, and document the slotting rules, client rate cards, temperature zones, and integration points that the standard products missed. You leave week 1 with a written scope document and a fixed-price quote, and development starts only after sign-off.
Weeks 2-4 cover design and data architecture, with the scanner workflows your team touches hundreds of times a day designed first, because floor usability decides whether the team adopts the system or routes around it. Weeks 5-16 are the build, with receiving, putaway, and picking logic landing first so the floor feels the improvement early. Weeks 17-20 are a parallel run: the new WMS runs alongside the old system on one zone or one shift, counts are reconciled daily, and the full cut-over happens only when inventory accuracy matches, with a tested rollback plan in hand.
What a build costs, and why it's fixed
Where you land on price depends on scope, not negotiation:
- Focused build, $60,000-$90,000
- Receiving, putaway, picking, and shipping with barcode scanning and a single ERP integration. 16-20 weeks.
- With 3PL billing and cold chain, $100,000-$150,000
- Adds multi-client rate cards, temperature zone monitoring with quarantine holds, and EDI trading-partner connections. 20-28 weeks.
- Full platform, $160,000-$250,000
- RFID portals, automation-system integration, multi-warehouse support, and a custom analytics layer.
What it costs
Custom WMS software, starting at $60,000.
Receiving, putaway, picking, and shipping at the core, with 3PL billing, cold-chain compliance, and ERP integration added as your operation needs them.
Commercial WMS platforms charge per user per month for a product you never own. Start with the core platform, own it outright, then add multi-client billing and cold-chain compliance as your operation needs them.
Starting investment
Starts at $60,000
A focused v1 launches in about 16 to 20 weeks. No per-user seat fees, so a 100+ person operation stops paying per-seat fees every month for rented access. Start with the core warehouse workflows, then add 3PL billing and cold-chain modules as the operation grows.
No hourly billing
Once we scope your first phase, that price is locked in writing. No hourly billing, and scope changes are priced and agreed before any additional work starts, so your capital budget stays under control.
You own it
All code, infrastructure, and API contracts transfer to you at handover. No per-user SaaS seat fees, no ongoing licence fees, no vendor lock-in: your operations team controls the platform.
This platform rarely stands alone. The ERP integration connects financials and purchasing to the same data layer, supply chain software extends visibility upstream and downstream, and logistics automation handles dispatch and routing on the outbound side — see the UrShipper multi-carrier shipping case study for what that looks like in production. When demand forecasting or picking anomalies matter, AI for logistics comes in, and IoT development feeds live sensor data from temperature zones and dock doors into it. Not every operation needs a full WMS: inventory management software covers the lighter case — inventory software tracks what you have; a WMS runs the people, zones, and picks that move it. Our logistics industry page maps how these pieces fit real operations, and the AI warehouse operations playbook covers the demand-forecasting angle in plain terms.
Work with us
Tell us where the work is stuck.
Bring the rough workflow, half-built product, or messy brief. We will map the smallest useful first move, then send scope, timeline, and price in plain English.
- Scope and cost agreed before work starts. No surprises. No obligation.
- Working prototype within 3 weeks of kickoff.
- Pay by milestone. You see progress before each invoice.
- 60-day post-launch warranty. Bug fixes, UI tweaks, and deployment support. No retainer.
- All conversations are NDA-protected.
Common questions
A typical WMS build includes four parts. Receiving: ASN matching, inbound appointment scheduling, dock door assignment, and goods-in checks with barcode or RFID capture. Putaway and storage: slotting rules based on velocity, weight, and temperature zone, directed putaway to the optimal bin, and cycle counting. Picking and packing: wave, zone, or batch picking configured to your order profile, pick-path optimisation, cartonisation, and pack verification. Shipping: carrier rate shopping, label generation, manifesting, and ASN or EDI dispatch to trading partners. Sales-channel connectors for Shopify, Amazon, and other channels hold one inventory picture and push available-to-promise counts to each channel in near real time, reserving stock per channel, so two channels can't sell the same unit during a peak rush. On top of that sits the operations dashboard: inventory accuracy, order cycle time, picks per hour, and dock utilisation. Integrations connect the WMS to your ERP for financials and to carriers and 3PL partners for the last mile.
A focused build covering receiving, putaway, picking, and shipping with barcode scanning and a single ERP integration typically runs $60,000-$90,000 and takes 16-20 weeks. Adding multi-client 3PL billing, cold-chain temperature monitoring, and EDI trading-partner connections typically runs $100,000-$150,000 and takes 20-28 weeks. A full platform with RFID, conveyor or automation-system integration, multi-warehouse support, and a custom analytics layer typically runs $160,000-$250,000. All builds are fixed price: the quote in the project brief is the final invoice. Infrastructure and device costs run a fraction of the per-user seat fees charged by commercial WMS SaaS.
A focused v1 goes live in 16-20 weeks. Week 1 is an operations audit: we walk your floor, map receiving through shipping, and document slotting rules, client rate cards, and integration points. Weeks 2-4 cover design and data architecture. Weeks 5-16 are the build, with the scanning workflows and the putaway and picking logic first because the floor feels those first. Weeks 17-20 are a parallel run: the new WMS runs alongside the old system on one zone or one shift, counts are reconciled daily, and the full cut-over happens only when inventory accuracy matches. Larger multi-warehouse builds run 24-32 weeks with the same parallel-run discipline per site.
Buy when your operation fits the standard model: one client, ambient temperature, standard pick-pack-ship, and a SaaS product that already integrates with your ERP. Build when the standard model breaks: multi-client 3PL billing with per-client rate cards, cold-chain zones with quarantine rules, high-SKU slotting logic your pickers depend on, or per-user seat fees that scale past the value on a 100+ person operation. The way to find out is a two-week fit analysis: we map your most painful workflows against the leading SaaS WMS products and show you which ones they cover and which ones they don't. If the standard products cover most of them, buy — we'll tell you that. If they don't, the spreadsheet workarounds are usually already costing more than a build.
Common ERP integrations: SAP S/4HANA and SAP Business One, Oracle NetSuite, Microsoft Dynamics 365 Business Central and Finance and Operations, and Sage. The WMS typically owns inventory movements, bin locations, and warehouse labour, while the ERP owns financials, purchasing, and sales orders; we define that boundary in week-one discovery so nothing is double-entered. Carrier integrations cover FedEx, UPS, DHL, and regional LTL carriers for rate shopping and label generation. EDI connections handle 850, 856, and 810 transactions with retail and grocery trading partners. For operations not on a standard platform, we build middleware against your existing data source, whether that is a legacy system API, an SFTP feed, or a database schema.
Scanning is built for the pace of the floor, not the desk. Handheld workflows cover receiving, putaway confirmation, picking, cycle counts, and shipping verification, running on rugged Android devices or standard smartphones in protective cases. Barcode is the default: GS1-128 for cartons, SSCC for pallets, and your existing label formats supported from day one. RFID is added where the volume justifies it, typically dock-door portals for bulk receiving and shipping, where a full pallet reads in seconds instead of per-carton scans. The scanner app works with intermittent connectivity: scans queue on-device and sync when the network returns, so a Wi-Fi dead spot in the back of the warehouse never loses a transaction. We test on your actual devices and your actual labels before go-live, not in a lab.
Yes, that is one of the main reasons to build. Multi-warehouse support gives each site its own layout, slotting rules, and labour pool under one inventory picture, with inter-warehouse transfers tracked as first-class movements. Multi-client 3PL support goes further: each client gets its own rate card (storage per pallet per day, handling per unit, per order, or blended), its own billing rules, and its own reporting portal, while the floor team works one unified queue. Client onboarding becomes configuration, not a project: new rate card, new label templates, new EDI profile, and the client is live. Access control keeps each client's inventory and invoices visible only to them and to your admin team.
Returns are configured as a first-class inbound flow, not an afterthought: scan a returned item, and the system routes it by rule — restock to the saleable bin, send to inspection, flag for refurbishment, or write off. Every return stays tied to the original order and client contract, so 3PL clients see credit-memo-ready data instead of a pile of unprocessed boxes. Return-rate and reason-code reporting comes standard, so you can see which SKUs and which clients are driving the reverse flow.
Yes — the WMS holds a single inventory picture and pushes available-to-promise counts to each channel in near real time, reserving safety stock per channel if you want it. When an order lands on Shopify or Amazon, the reservation is immediate, so two channels can't sell the same unit during a peak rush.
Migration is staged: master data (SKUs, bins, clients, rate cards) is imported and reconciled first, then the system runs in parallel with your current setup on one zone or shift, with daily count reconciliation. Cutover happens only when inventory accuracy matches, and a tested rollback plan is in place before the first live day. Historical transactions can be carried over or archived read-only — we scope that in week one, alongside the ERP integration boundary.
You own the code, infrastructure, and API contracts outright — no licence fees, no vendor lock-in. Most clients keep RaftLabs on a fixed-scope support retainer for the first year (monitoring, small changes, integration updates), then take it fully in-house or extend the retainer. Either way, the platform doesn't go dark the day we leave.