More consistent data
The integration reduces duplicates, mismatches and errors when moving information across CRMs, forms, payments, internal tools or products.
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Freelance service
API integrations
Connecting websites, CRMs, payments, forms, ERPs, databases and external tools.
- Free initial assessment An initial conversation to clarify the most useful next step.
- Direct communication You speak with the person analysing and building the work.
- Clear ownership Code, accounts, access and handover are defined.
Problem and outcome
What changes with API integrations
The scope is built around a real problem and a verifiable outcome, not a generic list of tasks.
Problems it solves
Your tools hold useful data, but they do not talk to each other in the way your workflow needs.An API integration connects tools so data can move between systems without manual copying, exporting or reconciliation.
It may involve consuming a third-party API, creating your own endpoints, receiving webhooks, transforming data, syncing states or exposing a small interface to supervise the flow.
Less manual dependency
Important changes can travel through an API or webhook instead of waiting for an export or manual review.
Failure behavior included
I define validation, retries, visible errors and limits so the integration remains operable when something external changes.
Guide price
What determines the price of API integrations
Three ways to start depending on the size of the need. Prices are indicative and final scope is agreed after the initial assessment.
One-off intervention
A technical review to clarify contracts, authentication and integration risk.
From
€250
+ VATWhat is included
- Review of current documentation and contracts.
- Test of authentication or a critical request.
- Plan for errors, retries and required data.
Boundary: This does not include the full integration or undocumented provider changes.
Ask about this interventionComplete project
The most common optionAn operational integration with visible state, errors and traceability.
From
€450
+ VATWhat is included
- Client code and data contracts.
- Authentication, validation and error handling.
- Safe retries and technical logging.
- Tests and deployment of the agreed journey.
Boundary: This does not include provider fees or endpoints outside the agreed scope.
Request a project assessmentMonthly support
Monitoring and evolution of an integration already in use.
From
€149 /month
+ VATWhat is included
- Review of errors and provider changes.
- Contract and credential updates.
- Small observability improvements.
Boundary: This does not include on-call cover or major API migrations within the fee.
Ask about monthly supportService scope
What a API integrations project includes
Final pricing depends on scope, integrations and project state. If it does not fit, I will say so before estimating.
Work included according to scope
- REST API clients, server endpoints and webhook receivers.
- Data mapping between third-party tools and internal models.
- Retry, validation and error handling for important flows.
- Documentation for environment variables and operational behavior.
Boundaries we put in writing
- This does not include the full integration or undocumented provider changes.
- This does not include provider fees or endpoints outside the agreed scope.
- This does not include on-call cover or major API migrations within the fee.
Process
How I deliver API integrations
I work on integrations from the data contract and failure cases, not only from the happy-path API call.
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Review the API docs, authentication and limits before committing to the flow.
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Define the data contract and failure behavior.
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Build the integration in a way that is testable and observable.
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Validate real requests and document how to maintain it.
Related proof
Experience relevant to API integrations
I write about backend work, tools, automation and practical decisions while building software.
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Idempotent APIs that survive retries
Patterns that prevent duplicate payments, orders and jobs.
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Questions before hiring API integrations
Can you work with messy API documentation?
Usually, yes. I start by validating the real requests and constraints before building too much around assumptions.
Do you only build backend integrations?
No. I can build the backend integration and the frontend screens needed to use or monitor it.
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Does this fit your project?
Tell me what you want to build, what you have now and what outcome you need. If it fits, I’ll suggest a clear next step.