A company's critical data lives in spreadsheets
The company's operations are managed using spreadsheets. Each department maintains its own file, there is no audit trail, customers ask about the status, and no one knows which file is up to date.
Custom web applications
A B2B portal or internal SaaS solution tailored to your processes. Implemented in 8 weeks.
Warehouse module, HR, CRM, CPQ, logistics, dealer portal, admin panel, custom internal tools—anywhere off-the-shelf SaaS doesn’t support your process. A 5-step implementation process with a 30/30/30/10 payment schedule.
8 weeks
From planning to launch
3 hours → 4 minutes
Valuation period at Akpil
12 000
devices connected at KG Elektronik
Four signs that off-the-shelf SaaS is no longer enough
If you recognize at least two of these—it makes sense to discuss a custom application.
You're only using 5% of the SaaS solution, and it's missing that one feature
You pay monthly for modules that no one uses. The feature you bought the system for isn't covered. Customizing an off-the-shelf tool costs more than building an app tailored to your process.
Departments do not share data or communicate via email
Each department has its own system or spreadsheet. The data is fragmented, decisions are based on a narrow view of reality, and in the meantime, the customer is waiting.
You scale by hiring, not by automating
Processes are in employees" heads, not in the system. Every new hire requires two weeks of training on "how we do things.” When an auditor asks for evidence of decisions, you show them emails.
Five implementation phases. 30/30/30/10 timeline.
A clickable prototype in a test environment before we write a single line of production code. Payment in four installments.
Week 1
Exploration
Sales process map. List of integrations. Decisions on what the MVP includes and what it doesn't. Result: a document outlining the scope and priorities. Deposit: 30%.
Weeks 2–3
UX/UI Design
A clickable prototype in a test environment. Every screen, every workflow, and every unusual scenario for validation by your sales team.
End of Week 3
Project approval
You approve the prototype. We won't start building the MVP without your approval. Upon approval: another 30%.
Weeks 4–7
Building an MVP
Weekly iterations in the test environment. Demos on Fridays. Integration with the systems you already have. After the MVP release: another 30%.
Week 8
Launch + team rollout
Production launch. Documentation. Training for sales representatives and administrators. After implementation: last 10%.
What exactly is changing at your company?
One database for the entire company
Warehouse, HR, sales, production, logistics—every department sees the same status. Change it in one place, and it updates everywhere. No need to copy and paste from one spreadsheet to another.
Processes in the system, not in people's heads
Business rules (discounts, approvals, escalations, inventory alerts) are programmed once. A new employee simply clicks on a scenario; they don’t have to spend two weeks learning “how we do things.” An auditor can see the decision trail in the log.
Real-time reporting
Inventory levels, sales KPIs, vacation time, project statuses, vehicle availability—all from today. Management makes decisions based on real-time operational data, not on a spreadsheet from two weeks ago.
Integration with the systems you already have
Polish ERP systems (Comarch, Optima, Asseco), traditional CRM platforms (Pipedrive, HubSpot, Salesforce), and industry-specific tools. The client-specific dashboard integrates with your existing infrastructure and does not require migration.
Implemented and operational
Every client is involved in production. Full case studies are available for review.
Akpil · Manufacturer of Agricultural Machinery
3 hours → 4 minutes
B2B panel with a CPQ module for export sales
A custom sales portal with a configuration and quoting module (CPQ) for 8 sales representatives handling 150 inquiries per week. The end customer configures the machine in a web browser, and the sales representative receives a ready-to-process order. The time required to quote a standard inquiry has dropped from 3 hours to 4 minutes.
View the full case studyKG Elektronik · Manufacturer of HVAC Electronics
12,000 devices
Administrative panel for an HVAC electronics manufacturer
A web-based administration panel for a manufacturer of gas boiler controllers. 12,000 devices connected at end-user locations. End users control their boilers via a mobile app, while the manufacturer manages reporting, telemetry, and status updates through the web panel.
View the full case studySee also live at our clients' sites: configure.akpil.pl · configurator.knieja.com.pl · or all the case studies in one place: jsoncrew.com/case-studies/
When to develop a custom app, and when to use a ready-made system
Two paths, two different company profiles.
Choose a ready-made system
- Standard process — SAP, Pipedrive, BambooHR, Asana, Jira, and Trello are suitable
- Our ready-made templates are tailored to your industry and specific needs
- The built-in integrations are sufficient
- A team of fewer than 20 people; a small-scale operation
Select an app for the client
- Custom process — custom pricing algorithm, discount rules, approval workflow
- A Polish ERP system (Comarch, Optima, Asseco) or a legacy system to integrate
- Modules not included in the off-the-shelf SaaS solution — CPQ, dealer portal, admin panel, custom WMS
- Scaling plan for the next 2–3 years; process ownership is mandatory
Custom applications are only developed when no off-the-shelf system is suitable.
Before you schedule an interview
What happens after implementation, and who we are.
After implementation
Maintenance packages
Launch Care1,190 PLN/month
WP/stack maintenance, backups, monitoring, 1 hour of dev/mc work
Growth Circle2,390 PLN/month
Launch Care + 2×2 hours of consulting per month + Slack + weekly workshops
Partner Labfrom 4,190 PLN/month
Growth Circle + reserved dev work block + higher SLAs
Optional packages. We will discuss the details during a meeting after implementation.
See also
Other services
Product configurators
specifications, variants, real-time pricing
ERP/CRM Integrations
Comarch, Optima, Asseco, Pipedrive
Automation
workflows, schedules, integrations
Mobile applications
iOS, Android, native apps, or PWAs
IoT
control panels, devices, telemetry
30 seconds on JSON Crew
Who We Are
2024
year of establishment
3
founders
4
Live case studies
A software company specializing in digital transformation for B2B sales. Product configurators, dashboards, and sales process automation. Three key case studies (Akpil, Knieja, and the internal JSON Hub platform) and portfolio implementations (KG Elektronik, Blachodach, a heat recovery center, and modular homes).
Frequently Asked Questions
↓How much does it cost?
It depends on the scope of the MVP—the number of modules, integrations, and business rules. During the first (free) consultation, we map out the scope and provide a specific quote with a 30/30/30/10 payment schedule. First, we decide on the scope; then, we set the budget.
↓What kind of web applications do you build?
B2B dashboards, dealer portals, administrative dashboards, internal SaaS solutions, CPQ modules, WMS, HR/CRM/logistics tools—anywhere a off-the-shelf system doesn’t support your process. We build solutions tailored to your specific process, not from a template.
↓How long does the implementation take?
Typically, 8 weeks from initial planning to MVP launch: Week 1—discovery; Weeks 2–3—UX/UI design; end of Week 3—approval; Weeks 4–7—MVP development; Week 8—launch and team onboarding. For larger projects, we divide the scope into subsequent iterations.
↓Do you integrate with our Comarch / Asseco / SAP / existing SaaS?
Yes. The customer-specific panel integrates with existing infrastructure: Polish ERP systems (Comarch, Optima, Asseco), CRM systems (Pipedrive, HubSpot, Salesforce), SAP, and industry-specific tools. We don’t force migration—we integrate with what’s already in place.
↓Do you build panels for end customers (multi-tenant)?
Yes. We build both internal dashboards and portals for end customers using a multi-tenant model—separate accounts, roles, permissions, and data for each customer, with a single administrative backend. Example: 12,000 devices at KG Elektronik’s end customers.
↓What about maintenance after implementation?
Maintenance is optional. We offer three packages: Launch Care (1,190 PLN/month), Growth Circle (2,390 PLN/month), and Partner Lab (starting at 4,190 PLN/month)—ranging from monitoring and backups to a dedicated dev work block and higher SLAs. We’ll work out the details after implementation.
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Guide
Web Apps for Businesses — When They're Worth It and What They Actually Offer
Web app It’s browser-based software—no installation required, accessible from any device, with a single source of truth for your data. For B2B companies, it’s typically an internal dashboard that replaces scattered Excel spreadsheets and five separate tools with a single system tailored to your process.
We don’t build apps „just because they’re trendy." We build them where the process is painful: when data is stuck in spreadsheets, sales and production don’t share a common view, and every change requires manual work. That’s when a custom web app pays off in terms of team time savings and fewer errors.
Web Application vs. Off-the-Shelf SaaS — Which to Choose
Off-the-shelf SaaS is cheaper to get started with, but it forces you to adapt your process to the tool. A custom web application works the other way around—it adapts to your process and integrates with what you already have. The choice is simple: if your process is standard, go with SaaS; if it’s your competitive advantage and no off-the-shelf solution supports it—build your own.
Types of Web Applications We Build
- B2B Dashboards and Customer Portals — self-service: customers place orders, check order status, and download documents on their own.
- Internal systems (custom SaaS) — CRM, order management, quoting, production — tailored to your process.
- Configurators and Calculators — complex logic for pricing and options in the browser (see product configurators).
- CPQ Modules and Quote Automation — digital bidding linked to the rest of the process.
How much will a web app cost in 2026?
A realistic pay range for your first, decent job is 30,000–50,000 PLN For MVP, the cost is higher for complex integrations and business logic. The price is driven up by: the number of roles and permissions, integrations with external systems, the complexity of business logic, and data requirements. We break this down in the article How much does a web application cost?, and you can calculate an approximate estimate in application cost estimator.
What the Implementation Looks Like: An MVP in 8 Weeks
You don’t start with a system that takes two years to build. You start with an MVP—a working version with the most important feature—in 8 weeks. A clickable prototype in a test environment is created before we write a single line of production code, so you can see the direction we’re heading before you commit your budget. We move on to Phase 2 once the MVP is up and running and generating data on what to do next.
Integrations — An App That Isn't an Island
A web app is valuable when it integrates with the rest of your world: ERP, CRM, warehouse systems, and payment gateways. That’s why ERP/CRM integrations It's not an add-on—it's the foundation. We'll put together what you already have—we won't make you throw anything away.
Implementation Example
Smart Control App — The app and control panel as part of the customer’s product: a stable backend, user accounts, push notifications, and publication on the App Store and Google Play. What started as a „heating remote control" has evolved into a system that truly ensures safety.
Do you have a process that’s spread across multiple Excel spreadsheets? Schedule a free consultation—we’ll map it out and let you know if a web app is worth it and how much it would actually cost.