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Fiverr Pro
English
$
USD
I will connect two business systems through API or webhook
Yevhen S
About this gig
I will build one focused, tested connection between two business systems through documented APIs, webhooks, or polling. The integration authenticates correctly, maps required data, processes repeat events safely, and reports failures clearly. Includes API review, authentication, request mapping, webhook or polling logic, retries, duplicate-event protection, error reporting, focused tests, and setup instructions. Suitable for SaaS products, e-commerce businesses, agencies, and internal teams.
I am a frontend-focused full-stack developer with 6+ years of commercial experience using React, Next.js, Node.js, and TypeScript. My production experience includes REST and GraphQL APIs, authentication, payments, third-party integrations, and business workflows. Most commercial work is under NDA.
Basic covers one API action or one incoming webhook. Standard connects two systems with full event handling. Premium handles bidirectional or multi-event integration. Contact me before ordering so both APIs, access requirements, and expected events can be reviewed.
Get to know Yevhen S
Yevhen S
Senior FullStack Engineer
- FromFinland
- Member sinceJul 2026
- Avg. response time1 hour
Languages
Ukrainian, Russian, English
I build and improve digital products that must work reliably in real business conditions—not just look good in a demo.
I’m a software developer with 6+ years of experience in SaaS and fintech products. I help clients automate workflows, integrate services, build valuable features, fix complex issues, and improve existing systems without unnecessary rewrites.
I work with payments, dashboards, reporting, permissions, approval flows, complex forms, integrations, and internal tools. I take ownership from analysis to testing and delivery, with clear communication and practical solutions.
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FAQ
Can you integrate any two systems?
If both have documented REST APIs, webhooks, or file-based interfaces, I can build a tested connection. Reverse engineering private or undocumented APIs is excluded.
What is the difference between a webhook and polling?
A webhook pushes data when an event happens. Polling checks for new data on a schedule. I recommend whichever your systems support.
Can you work with an existing codebase?
Yes, if you provide repository access and explain how the integration should connect.
Will the integration prevent duplicate records?
Yes. Standard and Premium include duplicate-event protection where relevant to the system.
Can you maintain the integration after delivery?
This service covers one-time delivery. Ongoing maintenance would need a separate agreement.
