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Modernize

Make your separate business systems work together

We integrate CRM, ERP, payment, analytics and operational systems so that data flows between them reliably, with validation and monitoring.

In short

Systems integration connects business systems that were never designed to work together. We build the integration layer with APIs, events and data contracts, validate schemas, synchronize and reconcile data, and add monitoring, documentation and runbooks so that failures are noticed and can be recovered from.

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01 The problem

What problem does this solve?

When systems do not share data, people copy details between them, and the copies drift apart. Customer, order and payment records disagree, and working out which one is right takes time.

Connecting systems is more than moving data. Each connection needs an agreed contract for what is sent, checks that catch bad data, and monitoring, so that a silent failure does not go unnoticed.

02 What we build

What do we build?

  • Integration of CRM, ERP, payment, analytics and operational systems
  • APIs and event streams between your systems
  • Data contracts and schema validation
  • Synchronization, including change data capture where it fits
  • Reconciliation reports that show where systems disagree
  • API and contract tests
  • Monitoring, recovery, documentation and runbooks

03 Architecture

What does a typical architecture look like?

Typical architecture of a systems integration The flow runs from top to bottom. Systems: CRM, ERP and payments, SaaS and internal tools. Integration layer: APIs and event streams, Data contracts. Validation: Schema validation, Contract and API tests. Data flows: Synchronization and CDC, Reconciliation reports. Operations: Monitoring and recovery, Documentation and runbooks. Secrets and access managed centrally. SYSTEMS CRM, ERP and payments SaaS and internal tools INTEGRATION LAYER APIs and event streams Data contracts VALIDATION Schema validation Contract and API tests DATA FLOWS Synchronization and CDC Reconciliation reports OPERATIONS Monitoring and recovery Documentation and runbooks Secrets and access managed centrally
An integration layer connects your systems through APIs and event streams, validates every exchange against data contracts, and reports mismatches.

04 How it goes

How does the work usually go?

  1. Map the systems and data flows

    We inventory the systems, the data that moves between them and who owns each piece, so the scope matches how the business actually works.

  2. Define the contracts

    For each connection we agree what is exchanged, in what shape, and what counts as valid, and write it down as a data contract.

  3. Build the integration layer

    We implement the APIs, event streams and synchronization, with secrets and access managed centrally and code reviewed.

  4. Test and reconcile

    API and contract tests, schema validation and reconciliation reports show that the systems agree before release.

  5. Operate and document

    We set up monitoring and recovery, and provide documentation and runbooks so your team knows what to do when a connection fails.

Talk through the system you want to improve

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

05 Capabilities and stack

Which capabilities and technologies are involved?

  • Apache Kafka
  • Kafka Connect
  • Apache NiFi
  • Apache Airflow
  • Python
  • FastAPI
  • Node.js
  • REST APIs
  • PostgreSQL

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 retailer's online store, finance system and warehouse system each hold their own version of an order, and staff reconcile them by hand.

We map how an order moves between the systems, define the data contract for each connection, and build the integration with reconciliation reports that show any mismatch.

07 Questions

Questions people ask

No. Integration connects what you run today. If one system is the real obstacle, we say so, and legacy modernization can follow as a separate, staged step.

Schema validation and data contracts check each exchange, API and contract tests run before release, and reconciliation reports show where systems still disagree.

Monitoring and recovery are built in, and runbooks describe what to do. Ongoing support, if you want it, is agreed with its scope, access and escalation procedures set out first.

08 Who it suits

Who does this suit?

Talk through the system you want to improve

Tell us what the system does today and where it gets in the way. We will help you decide what to keep, what to change and in what order.

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.