Dedicated telecom, CRM/ERP and SaaS systems
We build communication-heavy business software: VoIP and SMS platforms, CRM/ERP workflows, client portals, billing modules and dedicated systems that support real operations.
VoIP
Telecom platforms
SMS
Messaging APIs
CRM/ERP
Client workflows
SaaS
Portals and billing
Operational proof
Specific experience behind the offer
We designed telecommunications and business platforms that handle millions of client traffic events per month: calls, messages, routing decisions, billing records, accounts and API workflows.
14+
Years building VoIP, SMS, CRM/ERP and business automation platforms
105+
Delivered projects across telecom, portals, CRM/ERP, SaaS and web systems
Millions
Client traffic events processed monthly across telecom, messaging, routing and billing workflows
CRM/ERP
Business systems for clients, products, invoices, billing and operations
A sharper reason to choose in4system
14+ years in communication systems
Experience with VoIP, SIP, SMS, SMPP, routing, provider integrations and billing-sensitive workflows.
Telecom plus business automation
We connect communication flows with CRM/ERP, SaaS portals, client accounts, permissions, invoices and daily operations.
Built for operational control
The goal is not only to launch software, but to give teams visibility, logs, limits, billing context and reliable support paths.
Focused software partner
For telecom, service and operations teams that need custom software
For more than 14 years, in4system has worked where communication and business process meet: VoIP and SMS platforms, client portals, CRM/ERP workflows, billing modules, APIs and dedicated SaaS systems. Websites, SEO and e-commerce are useful when they support that system, but the core offer is operational software that helps companies sell, serve and communicate reliably.
+14
Years running the business
+105
Delivered projects
Core
VoIP, SMS, CRM/ERP and SaaS
Message from CEO
Technology should make business calmer, clearer and easier to run.
When we build software, we start with the real workflow: calls, messages, clients, invoices, access, support and the places where teams lose time. A good telecom, CRM/ERP or SaaS system should make the process visible, controlled and reliable every day.
At in4system we combine practical engineering with long-term responsibility. We prefer clear scope, honest technical decisions, and systems that can grow with the company.
Artur Januszczyk
CEO, in4system
Core offer
Systems for communication, clients and operations
The main focus is VoIP/SMS platforms, CRM/ERP and SaaS systems, client portals, billing workflows and the APIs that connect them. Public websites, SEO and e-commerce are supporting capabilities when they serve the same business system.
VoIP, SMS & Telecom Systems
Communication platforms and integrations for VoIP providers, SMS services, routing, client portals, alerts and billing-sensitive operations.
SIP, SMPP, HTTP messaging, routing and telecom automation
Learn moreCRM & ERP Systems
Custom CRM/ERP workflows that connect customers, products, services, invoices, support and internal operations in one practical system.
Clients, statuses, invoices, tasks and service workflows
Learn moreSaaS & Client Portals
SaaS platforms and client portals with roles, invoices, product/service visibility, notifications and secure backend APIs.
Accounts, dashboards, billing and permissions
Learn moreWebsites Around the System
Clear websites and web applications that explain the offer, collect leads and connect with CRM, email, billing or telecom workflows.
Public pages, landing pages and web apps that support sales
Learn morePractical AI Automation
AI features used where they help the process: support triage, message drafts, document handling, knowledge assistants and internal automation.
Assistants and automations connected to real workflows
Learn moreE-commerce Integrations
Online sales flows and integrations that can connect orders with customers, invoices, notifications and back-office processes.
Orders, payments and buying workflows connected to operations
Learn moreSEO for Service Offers
SEO and content structure for companies that need clear service pages, case studies and buyer-friendly explanations of technical offers.
Search structure for niche technical and service businesses
Learn moreLatest work
Case studies
Check some of our works and find solutions close to what you need.
SMSFlare - SMS to Voice SIP Platform
Telecom platform work around SMS-to-voice SIP delivery, routing logic and operational messaging workflows.
EasyVoipCall - Routing, Billing and LCR Platform
VoIP platform work around routing, billing, least-cost routing and a client portal for telecom customers.
Hellasfone - Provisioning, SIP Trunking and Telecom CRM
Telecom operations platform work covering provisioning, SIP trunking, DID, vPBX, number porting and CRM workflows.
From our blog
Latest Articles
Client portals / 6 min read
How a client portal reduces support work
A practical look at what a client portal should include when customers need products, invoices, documents and service status in one place.
FAQ
Questions clients ask before starting an IT project
Short answers about scope, technology, pricing, support, and how we work.
Yes, but we position websites as part of the wider system: public pages that explain the offer, capture leads and connect with CRM, email, billing, telecom or client portal workflows.
We choose the stack around the product and business goal. Our work can include Next.js, React, PHP Laravel, Golang, Python, REST APIs, MySQL, integrations, automation, and custom frontend styling.
We estimate from scope, workflows, integrations, content, data migration, roles, security needs, and support expectations. The contact page includes a quick starting estimate, but final pricing needs a short discovery step.
Yes. We can modernize existing websites, connect APIs, migrate selected data, improve SEO structure, or build new modules around systems that already work.
Yes. We can support fixes, monitoring, improvements, security updates, content changes, and new feature development after release.