VoIP
Telecom platforms
SMS
Messaging APIs
CRM/ERP
Client workflows
SaaS
Portals and billing
Operational proof
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.
15+
Years building VoIP, SMS, CRM/ERP and business automation platforms
107+
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
Experience with VoIP, SIP, SMS, SMPP, routing, provider integrations and billing-sensitive workflows.
We connect communication flows with CRM/ERP, SaaS portals, client accounts, permissions, invoices and daily operations.
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 more than 15 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.
+15
Years running the business
+107
Delivered projects
Core
VoIP, SMS, CRM/ERP and SaaS
Message from CEO
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
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.
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 moreCustom 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 platforms and client portals with roles, invoices, product/service visibility, notifications and secure backend APIs.
Accounts, dashboards, billing and permissions
Learn moreClear 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 moreAI 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 moreOnline 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 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
Explore selected telecom, SaaS, CRM/ERP and web projects built around real operational, sales and integration challenges.
Telecom platform work around SMS-to-voice SIP delivery, routing logic and operational messaging workflows.
A connected wholesale VoIP operating ecosystem with a Laravel ERP, dedicated Go APIs, automated rate updates and LCR, client self-service, billing, reporting, secured interconnections and commission-based sales.
A multilingual WordPress frontend for telecom sales, with configurable pricing tables, API integrations and PayPal, IRIS and Alpha Bank payment flows.
From our blog
Telecom business / 13 min read
A practical path from the first contract to a scalable telecom company: specialization, B2B sales, reliable products, recurring revenue and margin control.
Read article
Client portals / 6 min read
A practical look at what a client portal should include when customers need products, invoices, documents and service status in one place.
Read article
ERP & CRM / 7 min read
How to plan ERP and CRM workflows so sales, operations and invoicing stop living in separate spreadsheets.
Read articleFAQ
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.
