Skip to content
BOOK A 20-MINUTE CALL
hello@seamwire.com
SERVICE · CUSTOM SOFTWARE · CRM

Custom CRM development, shaped around how you sell.

Seamwire builds custom CRMs for mid-size companies whose sales process does not fit a standard pipeline: quotes priced from your own rules, accounts with several sites and contracts, service history beside the deal. Before we build anything, we check whether extending Salesforce, HubSpot or Zoho would do the job, and we say so if it would. When a custom CRM is the right call, you own the code and every record, and it talks to your ERP and accounting from the first release.

Start with a 10-day first stepCustom software & internal tools
FIRST STEP
10 working daysOne process, mapped and shown working, with a business case and a dated plan.
TEAM
3–5 peopleA dedicated team from our 50+. The people who scope it build it.
OWNERSHIP
YoursCode, data and accounts are yours from the first commit. No lock-in.
01

SIGNS YOU NEED THIS

  1. 01Sales keep the real pipeline in a spreadsheet beside the CRM.
  2. 02Half the CRM's fields are blank and the other half hold workarounds.
  3. 03Quotes are built outside the CRM because your pricing rules do not fit it.
  4. 04A won deal is retyped into the ERP or accounting system before anything ships.
  5. 05The licence bill grows with every hire, for features most people never open.
  6. 06A customer's history is split between the CRM, the inbox and one person's memory.
02

WHAT WE BUILD · CUSTOM CRM DEVELOPMENT

03

SYSTEMS AND TOOLS WE COMMONLY WORK WITH

BUILD
  • TypeScript
  • React
  • Next.js
  • Node.js
  • PostgreSQL
CRMS WE EXTEND
  • Salesforce
  • HubSpot
  • Zoho CRM
  • Microsoft Dynamics 365
  • Pipedrive
CONNECTED TO
  • NetSuite
  • SAP Business One
  • Odoo
  • Xero
  • QuickBooks
  • Microsoft 365
  • Google Workspace

We pick tools for your situation, not ours. If something you already run does the job, we keep it.

04

HOW IT WORKS

  1. 01

    A 10-day first step

    One process or page, mapped with the people who do the work and shown working. You leave with a business case and a dated plan, and keep everything it produced.

  2. 02

    Build in short, visible steps

    Working software every week or two on a staging site you can click, with weekly written notes on what moved and what we need from you.

  3. 03

    Launch and hand over

    Released carefully, with monitoring switched on, then a handover pack: code, docs, runbooks and a session with your team.

  4. 04

    Look after it

    Support, monitoring and improvements on terms agreed in writing before we start, with a named team who knows the work.

The full approach, phase by phase
05

WHERE WE DO THIS MOST

01ManufacturingTYPICAL FIRST STEPConnect one line's output to your stock figures, so what you promise matches what you can make.02Logistics & supply chainTYPICAL FIRST STEPWire your dock scans to customer tracking, so “where is it?” answers itself.05Real estateTYPICAL FIRST STEPRoute every lead into one pipeline with the next action attached, so nothing waits in an inbox.06Professional & financial servicesTYPICAL FIRST STEPTake one intake process from inbox to filed and approved, with every step logged.
06

QUESTIONS BUYERS ASK

Should we build our own CRM?
Only if your sales process is part of how you win and a standard CRM keeps fighting it: unusual pricing, complicated account structures, or a service side the CRM cannot see. If your team follows a fairly normal pipeline, buy a CRM and configure it well. The 10-day first step maps how you sell against the CRMs you could buy, and ends with a recommendation either way.
Custom CRM vs Salesforce or HubSpot: which is better?
For most companies, Salesforce or HubSpot set up properly is the better answer: a mature product, mobile apps, email and calendar sync, and plenty of people who can support it. A custom CRM wins when the platform's data model forces constant workarounds, when per-seat licences cost more over time than owning the software, or when the CRM must work as part of your own operations system. We build both ways and will say which fits.
Who owns the data, and can you move it from our current CRM?
You own the code and every record, in your repositories and your cloud account. Moving across means exporting accounts, contacts, deals, notes and attachments, mapping them to the new structure, removing duplicates and checking the counts on both sides. We run the old and new systems side by side until your team trusts the new one, and keep a full export of the old.
Can a custom CRM connect to our ERP and accounting?
Yes, and that is often the reason to build one. We agree which system owns each piece of data, so customers might live in the CRM while prices and credit limits live in the ERP. Then a won deal becomes an order without retyping, invoices and balances show on the account, and any failed sync raises an alert to a named person.
What drives the cost of a custom CRM?
Mostly four things: how many kinds of record and relationship your business needs, how many systems the CRM must talk to, how messy the data you are moving is, and how much of a bought CRM's email, calendar and mobile features you need to match. Fewer, well-chosen features cost less to build and to look after. The first step ends with a scoped plan before you commit to anything more.
Does a custom CRM work on a phone and with Outlook or Gmail?
It can. We build it to work in a phone's browser by default, and connect it to Microsoft 365 or Google Workspace so emails and meetings attach to the right account. A bought CRM gives you these out of the box, so we count them in the build-or-buy comparison rather than discovering them halfway through the build.
Will our sales team actually use it?
We design for that from the start. The screens are built with the people who sell, fields are limited to the ones somebody uses, calls and emails are logged automatically where possible, and managers report from the same data reps enter. If a field is never filled in, we remove it rather than chase people to complete it.
07

GUIDES

01How to replace spreadsheets with custom software (without stopping the business)HOW TO · 6 MINWhen a spreadsheet has become a critical system, how to replace it with a custom tool safely: what to copy first, how to run both side by side, and how to move the data without losing anything.02Build or buy: when a custom internal tool beats off-the-shelf softwareDECISION · 5 MINA practical way to decide between buying software and building a custom internal tool: the questions to ask, the hidden costs on both sides, and when a hybrid (buy, then connect) is the best answer.03How to choose a custom software development company: 12 questions to askCHECKLIST · 6 MINTwelve questions to ask before hiring a custom software development company or agency, from who owns the code to how they handle security, handover and what happens after launch.

YOUR FIRST STEP

Start with one process, working in ten days.

Tell us where it slows down. We map it with your team, show it working, and hand you a business case. If the numbers do not work, you keep everything it produced.

Tell us where it slows down