Web
Web applications
Servers
Backend and APIs
Mobile
Mobile applications
Systems
Complete solutions
A partnership built around shared results
Have an idea for an application or system and know who to sell it to? We are seeking partners across industries. We combine your market knowledge and sales with our experience in delivering complete digital products.
You bring the idea, market knowledge and relationships. You acquire customers, grow sales and help define what users need.
We design and build the complete solution: a web or mobile application, backend, APIs, database and integrations. Together we agree on the scope of deployment, maintenance and further development.
We work for an agreed percentage of the project’s profit. We tailor flexible terms to the idea, each side’s contribution and the growth plan.
Before we start, we agree on the profit-sharing percentage, costs used to calculate profit, each side’s responsibilities and how settlements work. Let’s discuss a model that works for both of us.
We build web and mobile applications, server-side systems, SaaS, platforms and custom solutions across industries. We connect interfaces, business logic, data and infrastructure into a complete system.
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.
You grow the market and sales; we build the software. A shared goal and an agreed share of profit connect our commitment to the project’s results.
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
I am looking for partners who know their industry, have a product idea and can attract customers. At in4system, we will take care of the software. I want to build useful systems together and share the profit they generate.
Let’s agree on clear roles, the scope of work and a percentage share of profit. We will tailor the terms to the project, each side’s contribution and how we want to grow the business.
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 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 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
Roles, profit sharing, technology and how we work together.
Web and mobile applications, server-side systems, SaaS, platforms, business tools and custom solutions across industries. in4system delivers the complete system: interfaces, backend, APIs, databases, integrations and deployment.
Together we agree on the percentage split of project profit, the costs included, the scope of work and how settlements work. We tailor the terms to the project and each side’s contribution.
There is no single rate for every project. We agree on the percentage together after discussing the idea, market, customer acquisition, technical work and costs.
We deliver complete applications and systems across industries: web, server-side and mobile. We connect interfaces with backends, APIs, databases and integrations. We also bring our experience in VoIP, SMS, CRM/ERP, SaaS and billing to new products.
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.
For partnerships, we agree on a share of profit along with costs and each side’s responsibilities. For commissioned projects, we quote based on scope, integrations and support; the contact form lets you choose the appropriate model.
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.
