We design and build web and mobile applications and server-side systems. We connect interfaces, backends, APIs, databases and integrations into one product — from analysis and deployment to maintenance and further development.
Web
Web applications
Servers
Backend and APIs
Mobile
Android and iOS
Systems
Complete solutions
AI agents
Chat · Voice · Video · API
Experience
15+
Years in business
109+
Delivered projects
Millions
Client traffic events processed monthly
We agree on what should change in your company’s day-to-day work. This gives us the scope for the first version.
We design the application and integrations so that data and processes work together. We choose the technology to suit the task.
We launch the solution, then provide support and further development within the agreed scope.
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
Explore SaaS & client portalsWe build, configure and deploy AI agents for customer service and team workflows. We connect chat, voice and video with knowledge, APIs and business processes — from the first scenario to a working solution and further development.
Chatbots, Voice AI, Video AI and integrations with your systems
Explore AI automationCustom CRM/ERP workflows that connect customers, products, services, invoices, support and internal operations in one practical system.
Clients, statuses, invoices, tasks and service workflows
Explore CRM & ERP systemsWe 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
Explore business websitesCommunication platforms and integrations for VoIP providers, SMS services, routing, client portals, alerts and billing-sensitive operations.
SIP, SMPP, HTTP messaging, routing and telecom automation
Explore VoIP & SMS systemsOnline sales flows and integrations that can connect orders with customers, invoices, notifications and back-office processes.
Orders, payments and buying workflows connected to operations
Explore e-commerce integrationsSEO 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
Explore SEO servicesLatest work
Explore selected telecom, SaaS, CRM/ERP and web projects built around real operational, sales and integration challenges.
A complete telecom operations platform connecting SMPP messaging, SIP-based Voice OTP, customer billing and delivery diagnostics in one system.
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
AI and software development / 7 min read
Describe what you need and let a software company handle AI, technical decisions, testing and deployment. The goal is a working solution with little demand on your time and a reasonable cost.
Read article
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 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.
