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CRM Development & Integration

Custom CRM development & CRM integration services.

Build, customize, integrate, or extend a CRM around the way your business actually works. Seninweb is a CRM development company that helps businesses choose between custom CRM software, customizing an existing platform, CRM integration, CRM migration, workflow automation, CRM API development, and extensions to the CRM you already run. We start with your sales process, not with the software.

CRM pipeline moving customer records through deal stages into a database

Do You Really Need a Custom CRM?

Most businesses should not build a CRM from scratch. Before we write a line of code we look at four options, in this order. Sometimes the right answer is an existing platform configured properly. Sometimes it is customization or integration of the CRM you already pay for. Occasionally it is a fully custom CRM. We will tell you which one fits, even when it is the cheapest option.

01

Use an Existing CRM

If HubSpot, Zoho, Pipedrive or Salesforce covers your sales process out of the box, buy it. You get support, security patching and an ecosystem for a monthly fee, and you can be live in weeks.

02

Customize Your CRM

Custom fields, objects, pipelines, automation rules and reports on the platform you already run. This is where most businesses get the biggest return for the smallest budget.

03

Integrate Your CRM

Connect the CRM to your ERP, accounting, e-commerce store, phone system and support desk so customer data stops living in five places at once.

04

Build a Custom CRM

When your process cannot be modelled in any platform, integration depth exceeds native connectors, or per-user pricing has outgrown the cost of a build. Real triggers, not a default.

Custom CRM vs Off-the-Shelf CRM: Which Is Right for Your Business?

Neither option is always better. An existing CRM wins on speed, ecosystem and predictable cost. Custom CRM software wins when your data model, sales pipeline and business rules do not fit the boxes a platform gives you. The honest comparison looks like this.

Existing CRM (HubSpot, Salesforce, Zoho, Pipedrive)

Best when a standard sales process and standard integrations cover most of what you need.

Custom CRM Software

Best when the process is the competitive advantage and the software has to follow it exactly.

When building custom genuinely is right

There are real triggers. Your process cannot be modelled in any platform without fighting it the whole way. People keep parallel spreadsheets months after training. Routine operations need a developer. Integration depth exceeds anything native connectors reach. Or you are at a seat count where per user pricing has quietly overtaken the cost of a build.

If none of those describe you, buying wins on cost, time, support and security patching, and we will tell you so.

A reporting dashboard on a monitor

Custom CRM Software Development

Customer relationship management software is more than a contact list. A working CRM covers everything from the first lead to the renewal, and the modules below are what we build, either as a custom CRM application or as extensions to an existing platform. Pick the ones your sales process actually uses.

Customer & Contact Management

One record per person with roles, history and ownership, deduplicated on the way in.

Company & Account Management

Accounts, subsidiaries, sites and the contacts that belong to each, with account-level reporting.

Lead Management

Capture leads from your website, forms, calls and ads, score them and route them to the right person.

Sales Pipeline Management

Stages, probabilities and rules that match your sales process instead of a generic funnel.

Opportunity Management

Track products, values, competitors and decision makers on every open opportunity.

Deal Management

Deal records with pricing, terms, approvals and a clear won or lost outcome.

Task & Activity Management

Calls, meetings, visits and to-dos tied to the customer record, not lost in a personal calendar.

Follow-Up Automation

Reminders and tasks created automatically when a deal stalls or a customer needs attention.

Email Integration

Two-way sync with your mailbox so conversations land on the right contact and deal.

Communication History

Every email, call, message and note in one timeline per customer.

Quote & Proposal Management

Generate quotes from your price list, track versions and turn accepted quotes into deals.

Contract Management

Contract terms, renewal dates and obligations attached to the account they belong to.

Customer Support

Tickets, cases and SLAs linked to the same customer record your sales team uses.

Reporting & Analytics

Reports built around the questions management actually asks.

Sales Forecasting

Weighted pipeline forecasts by rep, team, product and period.

User Roles & Permissions

Who can see and edit what, down to the record and field level.

Custom Dashboards

Role-specific dashboards for reps, managers and directors.

CRM Sales Pipeline Development

A sales pipeline CRM is only useful when the stages mean the same thing to everyone. We model your real pipeline, from first contact to a won or lost outcome, then build the rules that move deals through it. A typical B2B pipeline looks like this, but yours may have three stages or twelve.

Stage 01

New Lead

Captured from web forms, calls, email or imports and assigned automatically.

Stage 02

Qualified

Budget, need and timing confirmed. Unqualified leads are recycled, not deleted.

Stage 03

Proposal

Quote generated from the price list and sent, with reminders if it goes quiet.

Stage 04

Negotiation

Discounts and terms routed for approval where your rules require it.

Stage 05

Won / Lost

Outcome and reason recorded so win/loss analysis is real, not anecdotal.

What we build into a custom sales CRM

CRM Workflow Automation

CRM development should remove administrative work, not create it. If your team is copying data between systems, creating the same tasks by hand, or chasing approvals over email, that is a workflow we can automate inside the CRM you build or the CRM you already use.

Lead Assignment

Automatically assign new leads based on team, territory, product line, language or any rule you define, with round-robin and load balancing where needed.

Follow-Up Automation

Create reminders and tasks when a customer needs follow-up, a quote has been open too long, or a deal has not moved in a set number of days.

Sales Notifications

Notify reps, managers or Slack channels when deals change stage, hit a value threshold, or are marked won or lost.

Approval Workflows

Route discounts, quotations, contracts and special terms for approval, with escalation and a full record of who approved what.

Data Automation

Synchronize customer, product and order information between your CRM, ERP, accounting and e-commerce systems so nobody re-keys data.

Communication Automation

Connect email, SMS, WhatsApp and telephony so messages are sent, logged and followed up from the customer record, where that is appropriate for your customers.

CRM Integration Services

Your CRM should not become another isolated system. We connect it to the software your business already uses, so customer data flows in both directions and your team works from one record. This is custom API integration work: REST APIs, webhooks, scheduled sync and event-driven updates, built with retries, idempotency and monitoring so it keeps working after launch.

CRM + ERP

Sync accounts, orders, stock and pricing so sales sees what operations sees.

CRM + Accounting

Push won deals to invoices and pull payment status back to the customer record.

CRM + E-commerce

Orders, customers and abandoned carts from your store into the CRM. See our e-commerce CRM integration work.

CRM + Website

Forms, chat and tracking create leads with source attribution automatically.

CRM + WooCommerce

WooCommerce orders and customers synced through custom plugins or the REST API.

CRM + Shopify

Shopify customers, orders and fulfilment events pushed into your pipeline.

CRM + Email

Two-way mailbox sync and campaign results attached to contacts.

CRM + WhatsApp

Conversations logged against the contact, with templates and follow-up tasks.

CRM + SMS

Transactional and reminder messages triggered from CRM events.

CRM + VoIP

Click-to-call, screen pop and automatic call logging with your phone system. See VoIP CRM integration.

CRM + FreePBX

Asterisk and FreePBX CRM integration using AMI, ARI and CDR data.

CRM + Call Center

Queue events, agent status and dispositions synced into the customer record, including AI call center handoffs.

CRM + Payment Systems

Payment links, status and failed-payment alerts from your payment integration.

CRM + Marketing Automation

Lead scores, campaign membership and engagement synced both ways.

CRM + Customer Support

Tickets and SLAs visible next to deals so sales knows before the renewal call.

CRM + REST APIs

Custom endpoints so any internal or third-party system can read and write CRM data safely.

CRM + Webhooks

Real-time events out of the CRM into anything that needs to react to them.

Example: CRM telephony integration, from ring to follow-up

Because we also build phone systems on Asterisk and FreePBX, CRM telephony integration is one of the most common projects we deliver. A typical incoming-call flow looks like this.

01

Incoming call

02

Identify the customer by caller ID

03

Open the CRM record on the agent screen

04

Log the call and recording

05

Create the activity

06

Assign the follow-up

CRM Platform Development & Customization

A complete rebuild is rarely necessary. If you already run a CRM platform, we work inside it: custom fields and objects, workflow automation, API integrations, reporting and custom modules, using each platform’s own APIs and extension points. We are an independent development company, not a reseller, so the advice is about what fits your process rather than what earns a commission.

HubSpot Development

Custom objects, workflows, HubSpot API integrations and custom-coded actions for teams outgrowing the defaults.

Salesforce Customization

Custom objects, flows, Apex and Salesforce API integrations with ERP, telephony and e-commerce.

Zoho CRM Development

Custom modules, Deluge functions and Zoho CRM integration with your other business systems.

Pipedrive Integration

Pipedrive API integrations, custom fields, automation and reporting beyond the built-in options.

Microsoft Dynamics 365

Dynamics CRM integration and customization for businesses standardized on Microsoft.

Other CRM Platforms

Freshsales, SugarCRM, Odoo, Bitrix24 and others: if it has an API, we can extend and integrate it.

Self-Hosted CRM Systems

SuiteCRM, EspoCRM, Odoo, vTiger and similar platforms for businesses that need to own their data and hosting.

Custom-Built CRM Systems

Inherited a custom CRM from a previous developer? We audit, stabilize, document and extend it.

Typical CRM customization work

Performance graphs displayed on a laptop screen

Extending what you already have

The gap in this market is not custom builds. It is the middle: custom objects and fields, the API glue between your CRM and everything else, deduplication that actually holds, role based access that reflects who should see what, and reporting that answers the question you keep asking rather than the one the default dashboard answers.

That is work on HubSpot, Zoho, Pipedrive or a self-hosted platform, and it costs a fraction of a rebuild.

CRM Migration & Data Migration

CRM migration services are where most CRM projects succeed or fail. We migrate customer records, contacts, deals, activities, notes, files and custom fields from spreadsheets, legacy CRM software or another platform, with the mapping and deduplication agreed before anything moves.

Where we migrate from

The CRM data migration process

01

Audit

Inventory every source, field and record count, and find the data nobody trusts.

02

Map

Agree field mapping, ownership and what happens to fields with no home.

03

Clean

Normalize formats, fix broken references and fill or flag missing values.

04

Deduplicate

Merge duplicates by rules you approve, keeping the history from both records.

05

Migrate

Move customer records, contacts, deals, activities, notes and custom fields with history intact.

06

Test

Compare record counts, spot-check accounts and reconcile pipeline totals.

07

Validate

Your team checks real customers in the new CRM while the old one still runs.

08

Launch

Cut over with a rollback plan and a final delta sync.

Migration is where trust is won or lost

A CRM nobody trusts is worse than no CRM at all, and that trust usually dies during migration. Field mapping decided before anything moves, duplicates resolved rather than carried across, history preserved, and a period where both systems run in parallel so the new one can be checked against the old.

Then training on your own live records, because generic demo data teaches nobody anything about their own job.

A software interface showing records and fields

One Complete View of Your Customer

A customer 360 view is what you get when the CRM is integrated properly: every contact, deal, email, call, meeting, order, invoice, support ticket and note attached to one customer record. Sales stops asking accounting, support stops asking sales, and management sees the whole relationship on one screen. Payment data belongs in that picture too, which is why payment integration so often lands in the same project as the CRM work.

Customer

The account, its status, owner and lifetime value.

Contacts

Every person at the account and their role in decisions.

Deals

Open, won and lost deals with values and stages.

Emails

Threads synced from your mailbox, not pasted in.

Calls

Logged from your phone system with recordings where allowed.

Meetings

Scheduled and completed meetings with outcomes.

Orders

Orders from your store or ERP, with fulfilment status.

Invoices

Issued, paid and overdue invoices from accounting.

Support

Open tickets and SLA status before the next sales call.

Notes

Internal context that survives staff changes.

CRM Reporting, Analytics & Sales Dashboards

Your CRM should answer business questions, not simply display data. CRM dashboard development starts with the questions your managers ask every Monday, then we build the reports that answer them from clean, integrated data. These are the dashboards we build most often.

Sales Dashboard

Pipeline, activity and revenue for each rep and team, updated live.

Lead Conversion

Conversion rates by source, stage and rep, with drop-off points.

Sales Pipeline

Value and count by stage, age of deals and stalled opportunities.

Revenue Forecast

Weighted and best-case forecasts by period, product and territory.

Win/Loss Analysis

Why deals are won or lost, by competitor, reason and segment.

Sales Activity

Calls, emails, meetings and visits per rep against targets.

Customer Acquisition

New customers, acquisition cost and time to first deal.

Marketing Source

Which campaigns and channels produce revenue, not just leads.

Customer Lifetime Value

Revenue, margin and retention per customer segment.

Team Performance

Quota attainment, response times and pipeline coverage per team.

CRM Security, Roles & Access Control

A CRM holds your entire customer base, so CRM security is designed in from the data model up, not bolted on before launch. Every custom CRM we build, and every platform we customize, gets a permission model that reflects who should see what.

Access control

Data protection

Mobile CRM for Sales Teams

Field sales and account managers do not work at a desk. We design the CRM as a responsive web application that works on desktop, laptop, tablet and mobile browser, so a rep can update a deal from the car park after a visit. A native iOS or Android app is a separate scope we can quote when it is genuinely needed, not something we assume.

Works on every screen

What reps do from their phone

CRM Development for Different Business Models

The right CRM depends on how you sell. A distributor with 4,000 accounts and a SaaS company with a free trial need different pipelines, different data and different automation. These are the business models we build and customize CRM software for most often.

B2B Sales

Multi-contact accounts, long sales cycles, quotes, approvals and renewals.

B2C Businesses

High-volume contacts, segmentation, campaigns and repeat-purchase tracking.

E-commerce

Orders, customer lifetime value, abandoned carts and support in one record.

Service Businesses

Jobs, quotes, scheduling and follow-ups for trades and local services.

Agencies

Leads, proposals, retainers, project handover and client reporting.

Real Estate

Properties, buyers, viewings, offers and agent pipelines with call logging.

SaaS Companies

Trials, onboarding, subscription status, churn signals and expansion deals.

Manufacturing

Dealers, RFQs, sample requests, order history and ERP-linked pricing.

Distributors

Territories, price lists, reorder patterns and rep visit planning.

Field Sales Teams

Routes, visit notes, mobile updates and manager visibility by territory.

Call Centers

Screen pop, dispositions, callbacks and queue data from your PBX in the CRM.

Professional Services

Engagements, proposals, billable work and referral tracking.

Is Your CRM Creating More Work Than It Saves?

Most CRM projects start with one of these complaints. Each has a specific fix, and the fix is not always a new CRM.

The problem

“Customer information is spread across Excel, email and WhatsApp.”

What we do

Centralize customer information in one CRM record, with the spreadsheets migrated and the channels integrated.

The problem

“Salespeople maintain their own spreadsheets.”

What we do

Create one shared sales pipeline that is faster to update than a spreadsheet, so people actually use it.

The problem

“Our CRM cannot connect to our ERP.”

What we do

Build a CRM ERP integration through the APIs, with two-way sync for accounts, orders and pricing.

The problem

“Our CRM does not match our sales process.”

What we do

Customize workflows, stages and objects so the CRM follows your process instead of the vendor’s default.

The problem

“The team manually creates the same tasks every day.”

What we do

Automate workflows: follow-ups, assignments, notifications and approvals triggered by CRM events.

The problem

“Management cannot see the real sales pipeline.”

What we do

Build custom CRM reporting from clean data so the pipeline report matches what reps know is true.

The problem

“Our CRM subscription is getting expensive as the team grows.”

What we do

Evaluate customization, a self-hosted platform or custom development against the real per-user cost, including maintenance.

Not sure which one you have?

Tell us how your team sells today and where the friction is. We will tell you whether it is a configuration problem, an integration problem, or a build.

How We Develop CRM Software

Our CRM development process is the same whether we are building custom CRM software or extending an existing platform. The early steps decide whether you need a build at all, and you can stop after discovery with a written recommendation.

01

Discovery

We learn how you sell, who touches the customer record and what is broken today.

02

CRM Requirements

Modules, users, integrations and reports written down and prioritized, with a build-or-customize recommendation.

03

Process Mapping

Your real sales, service and hand-off processes mapped stage by stage.

04

Data Model

Customers, contacts, deals, products and custom objects designed to fit the process and survive growth.

05

UX/UI Design

Screens designed around the daily tasks of reps and managers, reviewed with the people who will use them.

06

Development

Built in iterations you can test, with the most-used module first.

07

API & Integration

ERP, accounting, telephony, e-commerce and email connected with monitoring and error handling.

08

Data Migration

Audit, map, clean, deduplicate, migrate and validate against the old system.

09

Testing

Functional, integration and permission testing on your real data, not a demo dataset.

10

Deployment

Staged rollout with a rollback plan, on your infrastructure or ours.

11

Training

Role-based training on your own records, with short written guides your team keeps.

12

Support & Improvements

Maintenance, monitoring and a backlog of improvements as the business changes.

Build, Customize, Integrate, Migrate or Automate?

Five different projects, five different budgets. Find the one that matches your situation.

CRM APIs & System Integration

Every CRM we build exposes a documented REST API, and every platform we integrate is treated as one node in your system rather than the center of it. This is the CRM backend development and CRM API development that makes the integrations on this page reliable rather than fragile.

REST APIs

Documented endpoints for reading and writing customers, deals and activities from any system.

Webhooks

Real-time events out of the CRM so other systems react instantly instead of polling.

Authentication

OAuth, API keys and scoped tokens so each integration gets only the access it needs.

Data Synchronization

Two-way sync with conflict rules, retries, idempotency and dead-letter handling for failures.

Custom API Endpoints

Purpose-built endpoints for your ERP, portal or mobile app rather than generic CRUD.

Third-Party APIs

Telephony, payment, e-commerce, marketing and messaging platforms connected through their official APIs.

Database Integration

Direct integration with SQL databases and data warehouses where an API does not exist.

Event-Driven Workflows

Queues and event handlers so a won deal can trigger invoicing, provisioning and onboarding automatically.

How Much Does Custom CRM Development Cost?

Anyone quoting a CRM price before understanding your process is guessing. What we can tell you is what moves the number, and we will give you a written estimate with the assumptions visible. A customization or integration project is usually a fraction of a full build, which is why we scope that option first.

Number of users

How many people use it, in how many roles, and whether they are office or field based.

CRM modules

Which of the modules on this page you actually need at launch, and which can wait.

Number of integrations

Each connected system adds development, testing and ongoing monitoring.

Data migration

Record volume, source quality and how much deduplication and cleaning is required.

Automation complexity

Simple reminders are cheap. Multi-step approvals with exceptions are not.

Custom reporting

The number of dashboards and how much calculation sits behind them.

Mobile requirements

Responsive web is included. A native app is a separate scope.

Security requirements

Permission depth, audit logging, SSO and any compliance obligations you carry.

Hosting requirements

Cloud, self-hosted or on-premise, and the availability you need.

Support requirements

Response times, maintenance and the improvement budget after launch.

What to send us for an estimate

The more of these you can answer, the more precise the estimate. If you can only answer two, send those.

Sometimes We Will Tell You Not to Build a CRM

If HubSpot, Salesforce, Zoho, Pipedrive or another existing platform can solve your requirements more efficiently, we will tell you, and we will say so in the first conversation rather than after a discovery invoice. Buying wins on cost, time to launch, support and security patching more often than the software industry likes to admit.

When we say buy

Your process fits a standard pipeline, your integrations are covered by native connectors, and your team size makes subscription pricing sensible. We will name the platform we think fits and explain why.

What we do instead

We can help you customize it, integrate it, migrate into it, or automate the parts that waste your team’s time. That is usually where the real return is, and it costs a fraction of a rebuild.

When we say build

When your process cannot be modelled without fighting the platform, integration depth exceeds native connectors, or per-user pricing has quietly overtaken the cost of ownership. Then we cost it honestly, including the yearly maintenance a custom build carries.

Frequently Asked Questions

The questions businesses ask us most often about CRM development, customization, integration and migration.

Custom CRM development means building customer relationship management software around your data model, sales pipeline and business rules instead of adapting your process to a platform. It covers the modules you need, the integrations with your other systems, and the reports your managers actually ask for.

There is no honest fixed price. Cost is driven by user count, how many modules you need, the number of integrations, data migration volume, automation complexity, reporting, security and hosting. Customization or integration of an existing CRM is usually a fraction of a full build, so we scope that option first and give you a written estimate with the assumptions visible.

A focused first release covering the modules a sales team uses daily is typically a matter of months, not weeks, and we deliver it in iterations you can test rather than one launch at the end. Customization and integration projects on an existing platform are considerably shorter.

CRM customization works inside an existing platform: custom fields, objects, pipelines, automation and reports built with that platform’s own extension points. CRM development means building the application itself, including the data model and business logic. Customization is cheaper and faster. Development gives you full control. Most businesses need the first.

Yes. CRM ERP integration is one of the most common projects we deliver: two-way sync of accounts, orders, stock and pricing through the ERP’s API or database, with conflict rules, retries and monitoring so it keeps working after launch.

Yes, and this is a specialism rather than a sideline. We build phone systems on Asterisk and FreePBX, so we integrate them with CRMs using AMI, ARI and CDR data: click-to-call, screen pop on incoming calls, automatic call logging, recordings attached to the customer record and follow-up tasks created from call outcomes.

Yes, through the official WhatsApp Business API. Conversations are logged against the contact, templates can be sent from the CRM, and follow-up tasks can be created from replies. We will be clear about what the platform rules allow before you commit to it.

Yes. Excel to CRM migration is the most common migration we do. We audit the spreadsheets, agree field mapping, clean and deduplicate the records, migrate them with history intact, then validate the result against the originals before anyone relies on it.

Yes. We migrate accounts, contacts, opportunities, activities, notes, files and custom fields out of Salesforce, HubSpot, Zoho or Pipedrive into another platform or a custom CRM, with a parallel running period so you can check the new system against the old one.

Yes. We build HubSpot CRM integrations with ERP, accounting, e-commerce, telephony and internal systems using the HubSpot API, webhooks and custom-coded workflow actions. We are an independent development company, not a HubSpot reseller or partner.

Yes, within each platform’s own extension model: custom objects, fields, flows, automation, permissions and reporting, plus API integrations with your other systems. We do not claim any official partnership with these vendors.

Yes. A sales CRM built around your pipeline stages, qualification criteria, lead assignment rules, quote generation, approvals and forecasting, designed so updating it is faster than keeping a private spreadsheet. That last part is what decides whether a CRM gets used.

That is the approach we prefer. We map how you sell today, stage by stage, before designing anything. If the process has problems we will point them out, but we do not force a generic funnel onto a business that works differently for good reasons.

Yes. We sync customers, orders, fulfilment status and abandoned carts from WooCommerce, Shopify, PrestaShop or a custom store into the CRM, so sales and support see purchase history on the same record.

Yes. Sales dashboards, pipeline and forecast reports, win/loss analysis, activity tracking, acquisition cost and lifetime value, built around the questions your managers ask rather than the default dashboard the platform ships with.

Yes. Lead assignment and routing, follow-up reminders, stalled-deal alerts, stage-change notifications, approval workflows for discounts and contracts, and data sync between the CRM and your other systems.

Usually an existing CRM, customized properly. Build when your process cannot be modelled in any platform without fighting it, when people keep parallel spreadsheets months after training, when integration depth exceeds what native connectors reach, or when per-user pricing has overtaken the cost of a build. If none of those describe you, buying wins, and we will say so.

As secure as it is designed and maintained to be. We build role and record-level permissions, audit logging, secure API access with scoped tokens, encrypted and tested backups, and authentication that fits your environment. We scope compliance obligations with you rather than making blanket claims.

Yes. We build the CRM as a responsive web application that works on desktop, tablet and mobile browser, so reps can look up customers, update deals, log calls and add visit notes from the field. A native iOS or Android app is a separate scope we quote only when it is genuinely needed.

Yes. Integrations break when third-party APIs change, and a CRM that nobody maintains slowly stops being trusted. We offer ongoing maintenance, monitoring of the integrations we build, and a backlog of improvements as your business changes.

Let’s Build the CRM Your Business Actually Needs

Whether you need a custom CRM, CRM integration, CRM migration, workflow automation, or extensions to an existing platform, start with your business process, not the software. Tell us how your team sells today and what is getting in the way, and we will tell you which of the four options fits.