Web
Web applications
Servers
Backend and APIs
Mobile
Android and iOS
Systems
Complete solutions
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
108+
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 web and mobile applications with backends, databases and integrations. We design the whole solution around your idea, customers and business processes.
We agree on goals, scope and delivery stages. We focus on clear communication, stable deployment and the ability to develop the system further.
Focused software partner
We build web and mobile applications, server-side systems and integrated platforms across industries. We design interfaces, backends, APIs, databases and integrations, then deploy and develop the entire solution. Our experience also includes VoIP, SMS, CRM/ERP, client portals and billing.
+15
Years running the business
+108
Delivered projects
Core
Web, server-side, mobile
Message from CEO
At in4system, I combine experience in programming, networks and telecommunications to build complete systems. I start by understanding the problem, then choose the technology and connect the components into a useful solution.
I focus on clear architecture, practical integrations and direct communication. A successful product launch matters to me as much as its maintenance and further development.
Artur Januszczyk
CEO, in4system
Core offer
We deliver web, server-side and mobile solutions: from user interfaces, business logic, APIs and databases to integrations and deployment. The areas below show the components and specialisms we bring together in a complete product.
SaaS platforms and client portals with roles, invoices, product/service visibility, notifications and secure backend APIs.
Accounts, dashboards, billing and permissions
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 moreWe design and build Android and iOS mobile applications for customers and business teams. We connect the app interface with backends, APIs, databases and business processes, then support deployment and further development.
Smartphone and tablet applications connected to your system
Android
Google Play
App StoreClear 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 moreCommunication 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 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 / 9 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 / 7 min read
How to design a client portal that genuinely reduces support requests, from analysing repeated questions to live data, permissions, notifications and safe self-service.
Read article
ERP & CRM / 8 min read
How to connect CRM, ERP, billing and service operations without creating another silo: a practical plan from workflow mapping to a safe integration rollout.
Read articleFAQ
Scope, technologies, estimates and support after deployment.
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 prepare an estimate after discussing your goals, scope, integrations, existing systems and expected timeline. The contact form helps you outline the project; we agree on details and terms after a conversation.
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.
