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Build a product

A web app or portal your customers or staff can rely on

We build customer-facing and employee-facing business applications, with sign-in, permissions and connections to your other systems designed in from the start.

In short

A web application or portal gives customers or employees one place to do business with you. We build the front end, the backend services and APIs, sign-in and permissions, and the connections to CRM, ERP and payment systems, with automated tests, audit logging and monitoring behind them.

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01 The problem

What problem does this solve?

When business systems do not connect, people re-enter details, ask a colleague who has access, or wait for someone to look something up. The work gets done, but it depends on manual steps.

A business application also has to answer who may see and change what. Sign-in, permissions and an audit trail are far easier to design at the start than to add after people rely on the application.

02 What we build

What do we build?

  • A front-end application for customers or employees
  • Backend services and APIs behind it
  • Sign-in with roles and permissions
  • Connections to CRM, ERP, payment and other business systems
  • A database designed for your data and its growth
  • Audit logging of important actions
  • Automated tests and controlled releases

03 Architecture

What does a typical architecture look like?

Typical architecture of a web app or portal The flow runs from top to bottom. Users: Customers or employees, Sign-in and permissions. Portal: Frontend application, Backend services and APIs. Integrations: CRM, ERP and payments, Operational systems. Data: Relational or NoSQL database, Audit log. Delivery: Automated tests and releases, Monitoring. Access control and audit logging throughout. USERS Customers or employees Sign-in and permissions PORTAL Frontend application Backend services and APIs INTEGRATIONS CRM, ERP and payments Operational systems DATA Relational or NoSQL database Audit log DELIVERY Automated tests and releases Monitoring Access control and audit logging throughout
People sign in to a front end, backend services apply permissions and business rules, and integrations connect the portal to the systems the business already runs.

04 How it goes

How does the work usually go?

  1. Agree what the portal must do

    We gather requirements from the people who will use the portal and the people who own the process, and agree what acceptance means before building.

  2. Design access and integrations

    We design who can see and do what, how the portal connects to your CRM, ERP and payment systems, and how its data is modeled.

  3. Build and integrate in increments

    We implement the front end, backend services and integrations in working increments, with code review and automated tests.

  4. Test, harden and release

    We run integration and performance testing and user acceptance, remediate defects, then deploy with monitoring and runbooks.

  5. Hand over or keep improving

    We provide documentation and knowledge transfer. Ongoing enhancement can be agreed where you want it, with its scope set out first.

Talk through your product idea

30 minutes, video call. Prefer to write? Send a message

05 Capabilities and stack

Which capabilities and technologies are involved?

  • React
  • TypeScript
  • Node.js
  • FastAPI
  • Spring Boot
  • .NET
  • PostgreSQL
  • MongoDB

The final stack follows your requirements and what you already run. How we choose technology

06 A typical situation

What does this usually look like?

A business runs a customer process through phone calls and email, and its staff look up each answer in a different internal system before they can reply.

We build a portal on top of the existing systems of record, with sign-in and permissions that match how the business works and an audit log of important actions.

07 Questions

Questions people ask

Yes. Integration with CRM, ERP, payment, analytics and operational systems is part of the work. We confirm which systems and interfaces are involved during discovery, and we test the connections with API and contract tests.

Buying can be the better choice. A build-versus-buy analysis weighs your requirements against the cost of ownership and how much you would need to adapt. If a product fits, we say so before any development starts.

Permissions are designed with the application, using role-based access control and, where the rules need it, attribute-based control, with audit logging of important actions. What applies depends on data sensitivity and your contractual requirements.

08 Who it suits

Who does this suit?

09 Terms

Which terms come up here?

Talk through your product idea

Bring the idea as it is today. We will help you shape a first version, choose the right technology and plan the build.

30 minutes, video call. Prefer to write? Send a message

What happens next

  1. You pick a time, or send us a message.
  2. A person at Nexstella reads what you shared before we talk.
  3. You leave with a clear next step, even when that step is to wait.