Off-the-shelf software imposes its own way.
Your operation doesn't fit the form.
Every company that grows hits the same wall: the software you bought off the shelf covers 70% of what you need, and the other 30% turns into a parallel spreadsheet, a manual export, a rule that lives in one person's head. When that person goes on vacation or leaves the company, the knowledge leaves with them.
The reason is structural: an off-the-shelf product is designed for the middle of the market, with the average rule of an average industry. Your competitive edge lies exactly in what sets you apart: your business rules, your approval flows, the way you serve customers. A system that delivers results has to be born from your operation, not built alongside it.
Web platforms and systems designed for your operation.
We don't sell a closed box. We map how the work happens and build the right system for your case, around your business rules and connected to the tools you already use.
Web platforms and portals
Systems accessed from the browser to run your operation: client, partner, or sales rep portals, with business rules applied in real time. That's how Positec's order platform served 208 sales reps.
Internal management systems
Internal software that replaces the parallel spreadsheet and the workaround: approval flows, tracking dashboards, operational control, designed around your real process, not an average market model.
SaaS and digital products
When your business is the software itself, we build the product: multi-tenant, scalable, ready to grow without inflating cost and headcount with every new customer.
Business rules and ERP integration
The heart of a custom system: a business rules engine, native integration with ERP, databases, payment, and internal APIs. Data enters once and flows to the right places, no double entry.
Is this a more mobile-centric project? The same team delivers custom mobile apps. And when the system needs to think and decide, we integrate custom AI, AI agents and process automation, all on the same platform.
It starts with the operation. Always.
Mapping the real workflow
We sit down with your team and map how the work happens today: business rules, exceptions, required integrations. A senior team from the first contact, no middlemen.
Architecture and business rules
We model the data, the rules, and the integrations with your ERP and existing systems. We define what's a web platform, what's internal, what's a product.
Build and integration
We develop the system and connect it to ERP, databases, payment, and internal APIs in short cycles, prioritizing the highest-impact module first.
Production and evolution
We ship to production, measure the result, and evolve it. The operation's knowledge becomes a system, not something that stays only in people's heads.
A custom system gives back three freedoms
The platform operates outside business hours, 24/7. At Alter ON, health plan sales happen inside the app any time of day.
Grow without inflating cost and headcount. Positec's platform absorbed 208 sales reps and 53k+ orders without multiplying the team.
Knowledge becomes a system. At Positec, the discount rule that used to live in a salesperson's head became a system rule, applied equally across the entire sales force.
This isn't a promise. It's a platform in production.
Custom systems already moving real volume and revenue in the operations of clients who trusted NexUnio. The numbers are verifiable.
Positec
Industry / Distribution208 sales reps. R$ 125M in revenue.
The rule in the sales rep's head became a system rule. Order placed in minutes.
See the caseAlter ON
Health / InsurtechHealth insurance app.
78.8k leads, 71.9k orders, R$ 61.49M through the app.
See the caseXica Moda Mineira
Fashion / E-commerceSells, collects, brings customers back.
3 agents in production + ERP migration. In development: virtual fitting room.
See the casePlatforms that handle real volume.
Industries where NexUnio has already built custom systems and platforms, with business rules, ERP integration, and production operation.
Industry and distribution
Order platforms with real-time business rules and native ERP integration, like Positec's external sales force.
1 published caseInsurance and health plans
Sales, analysis, and management platforms with legal validation and traceable administrative workflows, like Alter ON's full sales cycle.
4 published casesRetail and e-commerce
Sales operation systems, ERP migration, and payment and logistics integration, like the switch from C7 to Bling at Xica Moda Mineira.
2 published casesCustom systems, no fine print.
What is custom software and when is it worth it?
Custom software is a system built around your own operation rules, instead of an off-the-shelf product patched with spreadsheets. It tends to pay off when the process is the business differentiator, when the ready-made system covers only part of the work, or when integration with your ERP and other tools is a must. When an off-the-shelf system is enough, see our guide on off-the-shelf systems versus custom software.
What does custom web systems and platforms development mean?
It means building the software your operation needs (a web platform, an internal management system, a portal, or a SaaS product) instead of adapting your company to an off-the-shelf product. NexUnio maps the workflow, the business rules, and the required integrations, and only then develops. The result is a system that follows your business logic, not the other way around. That's how Positec digitized 208 sales reps with commercial rules applied in real time.
What's the difference between a custom system and off-the-shelf software?
Off-the-shelf software imposes its own way of working and charges a per-user subscription forever. And when your business rule doesn't fit its form, it turns into a spreadsheet workaround. A custom system is born from your operation: your business rules, your approval flows, your fields. At Positec, the discount rule that used to live in a salesperson's head became a system rule, applied equally across all 208 sales reps.
Does the system integrate with my ERP and the tools I already use?
Yes. Integration with ERP, databases, payment gateways, and internal APIs is a core part of the work, not an extra. At Positec, the order platform sends every order to the ERP instantly. At Xica Moda Mineira, we ran a full ERP migration (from C7, without an API, to Bling, with a rich API) with no operational downtime, and from there every integration became direct and stable.
What's the difference between a web platform and a mobile app?
A web platform runs in the browser and is ideal for management systems, portals, dashboards, and internal operations accessed on desktop. A native mobile app is better when the use case is in the field, offline, or mobile-first. NexUnio delivers both and sometimes combines them, like at Alter ON, where the entire health plan sale lives inside the app. For mobile projects, see the custom apps page.
How long until the system goes into production?
We work in short cycles, prioritizing the highest-impact module to ship first. The team is senior from the first contact, with no middlemen and no learning curve on your dime. Systems like Positec's platform (53k+ orders, R$125M in revenue) and Alter ON's app (71.9k+ orders, R$61.49M) are already running in production with real volume.