API and webhook requirements with a documented data flow
Included when agreed in the written project scope.
Senior WordPress Developer in Kolkata. Open to full-time roles, selected freelance projects, and licensed software.
Freelance API Integration Developer for German businesses
Need API integration for a business in Germany? I work remotely from Kolkata, India, with clear scope, planned milestones and direct communication.
- API and webhook requirements with a documented data flow
- Authentication and least-privilege access agreed with system owners
- Validation, retry and duplicate-event handling where supported
- Test cases, logs and handover notes for expected failures
Freelance API integration
API integration for German businesses
A reliable API integration must handle authentication, timeouts, retries, duplicate events and useful error visibility, not only a successful test request. I scope the data flow and failure behavior with the systems’ owners.
- Direct communication with the developer
- Scope and milestones agreed in writing
- Remote delivery from Kolkata, India
Project scope
What a API integration project can include
Name the systems, API documentation, data that must move, event frequency, failure consequences, sandbox access and the person who owns each provider.
Authentication and least-privilege access agreed with system owners
Included when agreed in the written project scope.
Validation, retry and duplicate-event handling where supported
Included when agreed in the written project scope.
Test cases, logs and handover notes for expected failures
Included when agreed in the written project scope.
I am Sk Sirajul Ali, a freelance developer based in Kolkata, India. I take selected remote projects for German businesses. I do not claim a local office in Germany. I work remotely from India and welcome suitable German project briefs. My site does not claim a German office or German client case study.
API integration for German businesses
A reliable API integration must handle authentication, timeouts, retries, duplicate events and useful error visibility, not only a successful test request. I scope the data flow and failure behavior with the systems’ owners.
What this project can include
- API and webhook requirements with a documented data flow
- Authentication and least-privilege access agreed with system owners
- Validation, retry and duplicate-event handling where supported
- Test cases, logs and handover notes for expected failures
Working remotely with a developer in India
Germany moves between CET and CEST, so its working-hour overlap with India changes seasonally. We agree call times and review windows in the project plan. We agree the project scope, response expectations, payment terms and handover in writing before work begins. Any local payment, shipping, language, privacy or compliance requirements must be specified by your team; I implement agreed technical requirements and do not provide legal or tax advice.
Milestones and handover
The integration is tested against agreed success and failure cases, including timeouts or invalid data where the provider allows it. Credentials should be shared through an agreed secure process, not placed in public pages or email threads. The final handover lists completed work, any agreed follow-up items and the access or documentation your team needs to operate it.
What to include in your brief
Name the systems, API documentation, data that must move, event frequency, failure consequences, sandbox access and the person who owns each provider. Share your API integration goals, current platform or systems, target users, required integrations, preferred time zone and target date. You receive a scope and quote before development starts, and we review progress against agreed milestones.
For the wider market context, see my remote web development services for Germany. For the broader service overview, see API integration services. Selected delivered work is in the portfolio.
Selected portfolio
View My Work Examples of delivered work
These are selected public portfolio references, not claims that each project served Germany or used this exact service.
How the project works
From first brief to handover
Clear next steps, review points and project expectations.
Share the brief
Tell me about your goal, current platform, audience and target date.
Agree the scope
Review the deliverables, assumptions, milestones and quote in writing.
Build and review
Check progress against the agreed requirements and review points.
Handover
Receive the completed work and the access notes or documentation agreed for the project.
Frequently asked questions
Questions about this service
Are you based in Germany?
No. I am based in Kolkata, India and work remotely. I do not claim a local office in Germany.
Have you completed projects for German businesses?
I work remotely from India and welcome suitable German project briefs. My site does not claim a German office or German client case study.
What can API integration include?
API integration work can connect supported systems, but provider access, API limits and test environments must be confirmed before a delivery date is set.
How do you plan calls and project terms?
Germany moves between CET and CEST, so its working-hour overlap with India changes seasonally. We agree call times and review windows in the project plan. The written quote confirms scope, milestones, payment terms and communication before work begins.
Project enquiry · Germany
Tell me about your project
Share a short message or a project brief. I will review the details and reply about scope and next steps.
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