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John hellen
@john_hallen68
Professional Software Developer, API Integration and Automation
Nigeria
English
About me
Struggling with API integration, Stripe errors, or payment issues? Need an API developer to connect apps, fix bugs, or automate workflows? I solve backend problems fast.
I specialize in REST API development, Stripe API integration, Shopify API, Twilio SMS, OAuth2, and custom API solutions tailored to your business needs.
I’m John, an experienced API developer skilled in PHP, Laravel, Python, Node.js, MySQL, webhooks, Zapier automation, and AI integrations.
Let’s build scalable, secure systems that grow your business.
Contact me for free conversation flow!
Skills
John hellen
Offline •
Average response time: 1 hour
See my services
API & Integrations
I will integrate rest API, python API, stripe API, twilio SMS, webhook, ai automation
API & Integrations
I will integrate third party API, rest API, webhook setup in python, nodejs, PHP, mysql
Portfolio
Work experience
API Developer | Stripe & Payment Integration Expert | REST API Specialist
Freelancer.com • Self-employed
Apr 2026 - Present • 1 mo
Professional API Developer specializing in API integration, REST API development, and payment gateway integration. Built and integrated Stripe API, Shopify API, Twilio SMS API, and OAuth2 authentication systems. Experienced in fixing API errors, webhook setup, automation, and third-party API integration. Developed scalable backend systems using PHP, Laravel, Python, Node.js, and MySQL. Delivered solutions for payment processing, SaaS platforms, and workflow automation using Zapier and AI integrations. Skills (Add these) API Integration REST API Development Stripe API Payment Gateway Integration Webhooks OAuth2 PHP Laravel Python Node.js MySQL Zapier Automation Twilio API Shopify API Backend Development API Bug Fixing
7 Reviews
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
1-5 out of 7 Reviews
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mlehrer
Repeat Client
United States
Excellent experience working with this freelancer. The project involved building a fairly nuanced SMS-based accountability and reminder system using Node.js, Twilio, MongoDB, scheduling logic, inbound/outbound SMS handling, and a web-based configuration/dashboard flow. What stood out most was the freelancer’s...
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ashersadventure
Repeat Client
Canada
John Hellen is one of the best developers I’ve worked with. He handled my API integration flawlessly secure authentication, clean implementation, and everything fully tested and working. Communication was fast and professional, and he delivered exactly what was needed without issues. If you need reliable...
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ashersadventure
Repeat Client
Canada
John Hellen exceeded my expectations. Fast and reliable API integration with secure setup and full testing. Everything worked perfectly. Highly recommended for REST API, Stripe, Twilio, and backend automation.
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joan_render
Repeat Client
United States
John Hellen delivered a fast and fully working API integration. Great communication, secure implementation, and smooth results. Perfect for urgent backend, webhook, and automation projects.
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joan_render
Repeat Client
United States
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