Custom ERP software development means building the one system your finance, inventory, purchasing and order teams all work in, shaped around your process instead of a vendor's. We map the process, build the modules one at a time, connect the tools you keep, move your old data and train your people, and the code is assigned to your company under the contract.
Tell us about the ERP you need.
Custom ERP software development is the work of designing, building and running an enterprise resource planning system for one company: a single database plus the modules that finance, inventory, purchasing, production and order teams all read from and write to. As a service it covers process mapping, module design and build, integrations, data migration, testing, training and support after go-live.
The reason to commission one is fit. A packaged ERP asks your team to work the way its data model works. A custom ERP is shaped around the way you cost a job, approve a purchase or route an order, and you own the code instead of paying per seat to use someone else's.
Finance, stock, purchasing and orders share one database, and every posting is kept as an event. A balance can always be traced back to the transactions that made it, so month end stops being a reconciliation of exports.
When an order is placed, allocated, shipped or returned, the other modules hear about it straight away. Inventory, finance and planning agree without a nightly batch job or a person copying figures between screens.
Approval thresholds, costing rules and fulfillment steps are stored as settings, not buried in code, so finance can raise a limit or add an approver without waiting for a release.
The contract assigns the code made for your project to your company once it is paid, the repositories sit in your name from the first commit, and a handover is written down in case you take the system in-house.
Most companies should buy. A customizable ERP product is quicker to start, its vendor carries upgrades and tax changes, and its fields and workflows can be configured a long way before anyone writes code. We will say so on the first call if that is your situation.
To be plain about our scope: we do not implement, configure, customize or resell SAP, Oracle, NetSuite, Microsoft Dynamics or Odoo. That work belongs with the vendor or one of its partners. We build custom ERP software, either as a whole system or as modules that sit beside the packaged product you keep.
Building starts to earn its cost when two or more of these are true:
| Question | Packaged ERP | Custom ERP |
|---|---|---|
| Fit to your process | Your team adapts to its data model and screens | The data model is written around your process |
| Getting started | A configuration project run by the vendor or a partner | A two-week discovery sprint, then one module at a time |
| Licence | Paid every year, usually per user and per module | None; you pay for the build and its upkeep |
| Upgrades | The vendor ships them, and heavy customizations can break | Planned by your team or ours, on your schedule |
| Who owns it | The vendor owns the code; you rent access | The code is assigned to your company on full payment |
| Does not fit | A process that is part of your competitive edge | A standard process a product already handles well |
For the long version of this decision, with NetSuite as the worked example, read build vs buy ERP: NetSuite or a custom system, or put your own seat count into the build vs buy calculator.
Six modules carry most ERP work. Each has its own data, its own risks and its own connections, so we scope against the module rather than a bucket of hours. Every one can run on its own first and join a connected system later. The durations are the ranges we scope against once discovery is done.
6 to 14 weeks
General ledger, payables and receivables, multi-entity consolidation and period close. Correctness comes first here: every transaction is double entry, every number reconciles and the audit trail is append-only. Money is stored in whole minor units, never floating point, and the ledger works as an event log, so any balance can be rebuilt from its history. Tax and revenue recognition rules live in tested code, not spreadsheet macros.
5 to 12 weeks
Stock levels across locations, lot and serial tracking, valuation by FIFO, weighted average or standard cost, and cycle counts. The hard problem is two people claiming the same unit at the same moment, which we settle with reservation records and row locks in PostgreSQL. Barcode scans feed the same reservation model the order module reads, so the count on the shelf and the count on screen stay in step.
6 to 12 weeks
Demand planning, supplier scorecards, lead times and reorder policy. This module turns what inventory and orders already know into reorder points and safety stock your planners can trust. Every forecast assumption is a setting a planner can change, because a model nobody can adjust is a model nobody uses. Inbound shipment events arrive by webhook and land in the same log finance reconciles against.
5 to 10 weeks
Requisitions, approval routes, three-way match of purchase order, receipt and invoice, and vendor records. Procurement is about control: who may request, who must approve and what stops a payment. The approval matrix is stored as data, so a threshold changes without a release. Match exceptions collect in one queue, and every override is logged with its reason and the person who approved it.
8 to 18 weeks
Bills of material, work orders, capacity and material requirements planning. MRP is the heaviest module to compute: it explodes a multi-level bill of material against stock on hand, open purchase orders and the production calendar, then suggests what to make or buy and when. The planning run is a background job with repeatable output, so the same scenario always gives the same answer. Progress from the floor updates inventory as it happens.
5 to 12 weeks
Sales orders, fulfillment routing, returns and the status your customers see. Orders touch revenue and the customer at once, so this module carries the most outside risk. Each change of state, placed, allocated, picked, shipped or returned, is an event the other modules subscribe to. For businesses that sell online, this is the module that connects to the storefront.
| Module | Owns | Reads from | Guards against |
|---|---|---|---|
| Finance | Ledger, AP and AR | Procurement, orders | Numbers that do not reconcile |
| Inventory | Stock, valuation | Orders, manufacturing | Phantom or oversold stock |
| Supply chain | Forecasts, reorder policy | Inventory, orders | Stockouts and dead stock |
| Procurement | Purchase orders, approvals | Supply chain, finance | Unauthorized or duplicate spend |
| Manufacturing | Bills of material, work orders | Inventory, orders | Building what you cannot sell |
| Order management | Orders, fulfillment | Inventory, finance | Promising what you cannot ship |
A new ERP rarely replaces every tool. Accounting or payroll software, a CRM, an online store, shipping carriers and bank feeds often stay, and each has to trade data with the ERP. We connect through each system's documented API, take changes in by webhook and run every sync through a queue, so a failed call is retried instead of losing a record.
| System | What moves | ERP module |
|---|---|---|
| Accounting | Invoices, bills, payments and journal entries | Finance |
| Payroll | Pay runs and cost center totals, posted to the ledger | Finance |
| CRM | Customers, credit status, and quotes that become sales orders | Order management |
| Online store | Orders in; stock levels and order status back out | Order management, inventory |
| Shipping | Rates, labels and tracking events | Order management, supply chain |
| Bank feeds | Bank transactions and payment status for reconciliation | Finance |
Three rules apply to every connection. Each field has one system that owns it, written down, so two tools never overwrite each other. Each sync is safe to repeat, so a retried call cannot post the same invoice twice. Each failure lands in a queue a person can see and replay.
The same rules hold when a packaged ERP stays as your ledger: our modules talk to it through the API its vendor documents and supports, and we leave the product itself untouched. If the gap is on the sales side rather than in operations, that is custom CRM software development, and when the job is only a link between systems you already own, it runs as an API integration project.
Custom does not have to mean everything from scratch. Our ERP work takes one of three shapes, and the smallest one that solves the problem is usually the right one. The table sets out when each pays off and what it puts at risk.
| Path | Best when | What we build | Typical horizon | Main risk |
|---|---|---|---|---|
| Custom modules beside your ERP | The packaged ERP suits finance, but one or two workflows fit badly | The missing module, joined to the ERP through its documented API | 5 to 18 weeks per module | The two systems drifting apart, which one owner per field prevents |
| A full custom ERP | No packaged product fits the operating model | Several modules on one database, delivered one at a time | 6 to 18 months | Scope, and the total cost of owning it |
| Replace a legacy system | The old ERP or the spreadsheets have reached the end of their life | A data migration plus the new modules, run in parallel before cutover | 3 to 9 months | Reconciling the data at cutover |
One path is missing on purpose: changing a packaged ERP from the inside. Customizing SAP, NetSuite, Dynamics or Odoo is partner work, and its usual risk, a vendor upgrade breaking the changes, is also why the first path keeps our code outside the vendor's product.
When the work spans more than operations, with HR, sales and customer service sharing records too, the build becomes an enterprise software project. When the missing step is not ERP work at all, we build it as a standalone custom application.
One go-live date for every module at once is the riskiest way to deliver an ERP: nobody can use anything until everything works. We ship one module to real users before the next one starts. A single module and a full system go through the same six phases; a full system repeats the build cycle once per module.
Process maps, an audit of where each record lives today, module priorities and a written requirements document. It ends in a fixed price for the scope, or in our advice to buy a product instead.
One module reaches a usable state before the next begins. Each week ends with a recorded walkthrough of working code and a short written note of what shipped and what slipped.
Each module is checked against the process maps and requirements from discovery, then your own staff run their real cases on it and sign it off.
Old data moves through version-controlled rules, then the old and new systems run side by side with daily reconciliation. The migration steps are set out below.
Training by role for the people who use each module, before it goes live, plus a session for your IT team or partner on the data model and the code.
Cutover on a planned date with a written rollback path, while the legacy system stays read-only for an agreed window. After that, a retainer or your own team carries the system forward.
Implementing an ERP you had built is a different job from implementing a packaged one. There is no configuration project, but there is still training, data migration and a cutover plan, and we run all three. We start with the team whose workaround costs the most hours, train them before their module goes live, and keep the old system readable until the numbers agree.
The next team joins only once the first is working without the old tool. For the buyer's side of the same steps, with timeline and cost drivers, read our guide to ERP implementation in New York.
Moving off a legacy ERP, or off the spreadsheets that grew into one, is the highest-stakes part of the job. The data is the company's memory, and a bad cutover can stop shipping and billing on the same day. We run the old and new systems side by side, reconcile every record, and cut over only when the numbers agree for a full close.
A migration off a legacy ERP typically runs 3 to 9 months including the parallel run. The audit in step 1 sets that estimate, because the state of the data drives most of the effort.
A two-week pass over the old schema, its undocumented changes and the quality of its data. Every table is profiled for empty fields, orphaned records and format drift, and a risk register exists before the first migration script does. Most legacy systems hide years of workarounds; the audit finds them first.
Every old field maps to a new one, is transformed, or is retired with a written reason. The rules live in version-controlled, tested code rather than an import wizard, so the same input always gives the same output and a failed run can be replayed.
Both systems run live for at least one full accounting period. Daily reports flag any record where old and new disagree, and that gap is driven to zero before anyone relies on the new numbers.
Cutover happens on a planned date with a written way back. The legacy system stays read-only for an agreed window. If anything fails the reconciliation check, the go-live waits.
We publish no price list for ERP work, because one procurement module and a multi-entity system are different purchases. The price comes after the two-week discovery sprint, which we charge for: you leave it with a fixed price for a written scope, or with our advice to buy a packaged ERP after all.
You can still test any quote, ours included, because most of an ERP budget is engineering time. The US Bureau of Labor Statistics puts the median pay of a software developer at $135,980 a year in May 2025, and its employer cost survey has wages at 70.0 percent of total compensation in private industry in June 2026.
On those two figures, one developer costs an employer about $194,000 a year. Two developers on one module for six months therefore carry roughly $194,000 in pay and benefits alone, before anyone recruits, manages, tests or hosts anything. Sources: BLS Occupational Outlook Handbook and BLS Employer Costs for Employee Compensation.
| Cost driver | Lighter end | Heavier end |
|---|---|---|
| Modules in scope | One module, such as purchase approvals | Several modules sharing one ledger, with MRP among them |
| Systems to connect | One or two tools with documented APIs | Many tools, some with no usable API |
| Old data | Clean exports from one source | Years of spreadsheets, duplicates and fields nobody documented |
| Entities, sites and roles | One company, one site, a few roles | Several legal entities, currencies or warehouses, each with its own rules |
| Sector rules | Standard access control and audit history | Extra safeguards, such as HIPAA where health data is involved |
After launch, set aside a yearly budget for upkeep: dependency updates, rule changes from finance and new connections. Our software maintenance cost calculator estimates it, the development team cost calculator prices the people, and the custom software development cost guide explains how builds are priced and billed.
ERP work follows the shape of the operation more than the name of the industry. Two of the settings below come from builds we have shipped; the others run on the same modules and the same stack, without a new discipline. Each links to a page that goes deeper.
Outside our scope in every sector: clinical EHR systems, banking cores, insurance policy systems, oil and gas, government and defense work, and medical device firmware.
Neither of these is a full ERP. Each covers ERP work for a real client in 2026: a workforce and leave module in one, an order-to-production workflow with roles in the other. Both clients gave permission to be named. Neither has published results, so there are no figures here.
We built the whole Planivo platform, the signed-in app and its website. Clinics and hospitals use it to plan monthly shift rosters, send vacation requests through three levels of approval with a check for speciality conflicts, assign tasks, run training sessions with attendance, get reminders before certifications expire, and show who is on duty on display screens.
The ERP parts: a workforce and leave module, a three-level approval workflow, six roles and an audit history of every change.
SpeedyPrint sells labels, race numbers, stamps and trophies online. We built its browser design editor, CSV variable-data print jobs, proofs and production files with an order status history, PayFast checkout with webhooks, transactional email, and an admin panel for orders, products, templates and users.
The ERP parts: an order-to-production workflow with three roles (customer, admin and production staff). Built with Next.js 15, React, TypeScript and Supabase.
Neither started as a full suite. Each began with one workflow that ran on approvals and status changes, and with the roles around it: six in Planivo, three in SpeedyPrint. That is the order we recommend for most ERP projects. Start with the module where your people lose the most hours, give each role only what it needs, and add the ledger or the next module once the first one is trusted.
An ERP stays in use for years, so the stack is a maintenance decision. We build on the tools our own client systems already run on, ones a new engineer can read on day one, and we design the data model first, because in an ERP the data model is the product.
| Layer | Default |
|---|---|
| Screens and dashboards | Next.js, React, TypeScript |
| Services and jobs | Node.js, TypeScript |
| Forecasts and heavy reports | Python |
| System of record | PostgreSQL, often on Supabase |
| Sign in and roles | Supabase Auth, row-level security |
| Integrations | APIs, webhooks, retry queue |
| Payments | Stripe, or a regional gateway |
| Hosting | Vercel or Cloudflare Workers |
| Handheld and field apps | React Native |
PostgreSQL holds the transactional core because finance and stock need strong consistency and row locks, and because almost every engineer you might hire later already knows it. Hosting accounts are opened in your name, so the system keeps running whoever maintains it.
No SOC 2 or ISO 27001 report is claimed here. To hold our work, or anyone's, to a public checklist, use the OWASP Application Security Verification Standard.
An ERP will outlast most vendor relationships, so judge the firm on what you can verify rather than on its pitch. Here is each answer for Digital Heroes.
| Check | Our answer |
|---|---|
| Who sets the architecture | Our CTO, Divyansh Singh, who signs this page, sets the engineering standard for custom builds; each project has one named tech lead for the data model |
| Where the engineers work | Delhi and Lucknow, on hours that overlap the New York working day; our staffed offices are in New York and Delhi |
| How fast you hear back | The New York office answers on weekdays the same day, 9 AM to 6 PM Eastern, and every form on this site gets an email reply within 24 hours |
| Who signs the contract | The Digital Heroes company your MSA names; for US clients the governing law is usually New York's |
| Who owns the code | Your company, on full payment; libraries we had before your project stay ours, and a written opt-out keeps your system out of our portfolio |
| Records you can look up | Clutch rating of 5.0 from 66 verified reviews (checked 13 October 2026), DUNS 650878346 with Dun and Bradstreet, and Tier 1 supplier status on the UN Global Marketplace; our credentials page shows how to check each |
| When we are the wrong firm | Every engineer must be based in the United States, or what you need is a packaged ERP implemented |
The company facts behind each answer are on our custom software development company page. If you are comparing firms, start with our list of the top 10 ERP development companies, keeping in mind that we wrote it, or our New York software developer ranking for wider builds.
A custom ERP is enterprise resource planning software built for one company instead of bought as a product. It does the same core jobs as a packaged ERP, keeping finance, inventory, purchasing and orders in one database, but its data model, screens and approval rules follow that company's own process, and the company owns the code instead of renting seats.
Most are not built in one go. They start with the module the business struggles with most and add the others over time, often while a packaged accounting tool keeps running beside them.
With us, one module usually takes 5 to 18 weeks after a two-week discovery sprint, with MRP at the long end and procurement or inventory at the short end. A connected system of several modules runs 6 to 18 months, delivered one module at a time, so the first team works in its module long before the last one ships.
Moving off a legacy system takes 3 to 9 months, including the parallel run. The module cards above give the range for each module.
It depends on five things: the modules in scope, the systems they connect to, the state of the data you are moving, the entities, sites and roles the rules must cover, and any sector rules such as HIPAA. We give a fixed price for a written scope at the end of the discovery sprint.
To test any quote, start from engineering time. On BLS figures, one US software developer costs an employer about $194,000 a year in pay and benefits, so count the developers and months a quote implies.
Customize the packaged product when it already fits most of your process and the gap is settings, fields and reports; that is work for its vendor or a partner. Build when the gap is a whole workflow no product covers, when licence fees at your headcount pass the cost of owning a build, or when outside users need the system under your brand.
Many companies do both: they keep the packaged ledger and add custom modules beside it.
No. We do not implement, configure, customize or resell any packaged ERP. If one of them fits, buy it through its vendor or a partner. What we build is custom software: a full custom ERP, or a module or portal beside the packaged product that reads from it and writes to it through the API its vendor documents, so the product itself stays untouched and upgradeable.
An ERP developer designs and builds the parts of the system a business runs on: the data model behind finance, stock and orders, the rules for approvals, costing and posting, the screens each role works in, and the connections to outside tools. On our builds the most senior of those jobs is the data model, because every report and reconciliation depends on it, so one named tech lead owns it from discovery to handover.
There is no single one. Packaged ERPs each come with their own language and extension tools, while a custom ERP can use any mainstream language with a strong database underneath. Ours uses TypeScript for the screens, in Next.js and React, and for the services, in Node.js, with PostgreSQL as the system of record and Python where forecasting or heavy reporting needs its data libraries.
Yes, wherever the tool offers a documented API. We connect through that API, take changes in by webhook and pass every sync through a queue, so a failed call is retried rather than lost. Payroll, shipping and bank feeds work the same way. Every system on your list is checked during discovery, so a tool with no usable API shows up in the scope, not halfway through the build.
In four steps, never as a weekend switch. We profile the data for gaps, duplicates and format drift, then write version-controlled rules that map, transform or retire every field with a reason. Old and new systems then run side by side for at least one accounting period with daily reconciliation, and cutover happens on a planned date with a written rollback path. If the numbers still disagree, the go-live waits.
You do. Under our MSA, the code and custom assets made for your project are assigned to your company once it is paid in full; only the libraries and tools we already had stay ours. Keep the repositories, the database and the hosting accounts in your company's name from the start, and the handover includes a session on the data model for whoever runs it next.
Yes. Our headquarters are in New York and Delhi, and for US clients the governing law in our MSA is usually New York's. The engineers who build your ERP work from Delhi and Lucknow, on hours that overlap the US East Coast, and the New York office answers the same day on weekdays between 9 AM and 6 PM Eastern. If every engineer must sit in the United States, we are the wrong fit.
The legacy system stays read-only for an agreed window, so any record can still be checked against the old data. After that, fixes, upgrades and new modules run on a monthly retainer, the smallest of which is one senior engineer and one designer. If you would rather run the system yourselves, the knowledge transfer session and the handover in your contract cover that path instead.
Last reviewed .
Bring one workflow to a 30-minute call: the approval that waits in an inbox, the stock count that never matches, the close that takes a week. We will tell you whether it needs a custom module, a full ERP or a packaged product, and nothing is owed for the call.
Published reviews from our Fiverr profile, reproduced word for word. 397 public reviews across 4 gigs, from clients in 36 countries. Read them all on Fiverr.
Working with this developer was an excellent experience They completely understood what we wanted for our pet accessories brand and translated it beautifully into a clean website Very impressed with the attention to detail, animations and overall execution Highly recommended
Completed Phase 1 of my project. Looking forward to starting and completing Phase 2. The level of work thus far on Phase 1 has been absolutely exceptional! The communication was easy and I am very pleased with the project and how it's coming along so far!
We’re extremely impressed with the outcome. The system is clean, structured, and works exactly as we wanted it to be. The team was supportive, really helpful, and ensured everything was executed perfectly. We’re excited to continue working together.
Very easy and worth the time and money. You provide what you want, they develop it quickly, edit it as you ask, then deliver a product you are happy with. Communication is free flowing, they take feedback well and implement it. The process feel and looks like what you want at a decent price point.
Un freelance excepcional. Ha entendido mi proyecto al 100% y estoy muy contento con los resultados. Soy un profesional con muchos proyectos a las espaldas y solo puedo decir que merece mucho la pena contar con sus servicios y le llamaré para otros proyectos.
Saurab did an excellent job. He understood the requirements quickly and translated them into a high-quality product delivered on time. I’m very happy with the collaboration and look forward to working together on future projects. Excellent Job done!
Reviews are reproduced as published on Fiverr, captured 2026-08-03. Fiverr shows the buyer's username and country publicly; no other client detail is used here.
115 people in New York, Delhi, Lucknow, London and Sydney, shipping ecommerce, web, software and mobile work for founder-led brands. Senior engineers only, no account-manager relay, and the same team from kickoff to launch.
Chief Technology Officer · Lucknow · 57 posts on the site
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