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Development of third-party API integrations

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Listing period9 daysuntil 23.11.2026
Posted25.08.2026
Views730 in 14 days

About the service

I develop integrations that link your application to external services. Need a neat REST or GraphQL client, webhook ingestion and sending, OAuth authorization or connection to a payment, logistics, or marketing platform—I handle all the technical work so your product just works. Over the years I've learned that complexity isn't in the happy path; it's in timeouts, rate limits, stale tokens, and broken responses that fail silently at the worst moment.

My work isn't a one-off script. I design every integration with retries, exponential backoff, idempotency keys, and proper error handling so an unstable third-party service never corrupts your data or creates duplicate orders. I set up reliable bidirectional sync between systems, add logging and alerts so you see exactly what happened, and document everything so your team can maintain the solution.

Describe which services need to connect and what should happen during data exchange—and I'll deliver a tested integration ready for production and real load.

What I can connect:
— Payment, delivery, and billing providers
— CRM, email, and marketing platforms
— Internal services and databases via REST or GraphQL

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Olena T.Web programming
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