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apiauthpro

Stephen S

@apiauthpro

Expert API Integrations, Secure Auth, Stripe, Firebase Dev Solutions

United Kingdom
English, German
About me
Struggling with broken integrations, insecure authentication, or APIs that just won’t sync? I help businesses fix OAuth2, JWT, social login, Stripe payments, Firebase & Supabase backends fast. I specialize in WordPress API, Shopify API, Wix API, Etsy API, Amazon SP API & custom plugin development to automate workflows, boost security, and scale your platform. No more wasted time or lost revenue get clean, reliable, and scalable solutions. Ready to fix your system and grow faster? Message me now and let’s build something powerful!... Read more

Skills

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apiauthpro
Stephen S
Offline • 
Average response time: 1 hour

See my services

API & Integrations
I will integrate oauth2, jwt, stripe firebase social login system wordpress shopify API
From$30 / projectMore details
App Store Optimization
I will aso app store optimization google play seo app marketing mobile promotion expert
From$15 / projectMore details

Portfolio

Work experience

Freelancing_Career

Freelance API & Backend Developer

Freelancing Career • Self-employed

Mar 2023 - Present • 3 yrs 2 mos

I work as a freelance API & backend developer helping businesses build, fix, and scale secure and high-performance systems. My core responsibilities include designing and integrating REST APIs, implementing secure authentication systems using OAuth2 and JWT, and developing payment systems using Stripe. I also specialize in backend automation and connecting third-party platforms such as Shopify, WordPress, Wix, Etsy, and Amazon SP API. I build and maintain backend systems using Firebase and Supabase, ensuring data security, scalability, and fast performance. I also troubleshoot broken API integrations, optimize server responses, and develop custom plugins and automation workflows for business operations. Key achievements and services include: Built secure authentication systems (OAuth2 & JWT) for web applications Integrated Stripe payment gateways for subscription and eCommerce platforms Developed and fixed REST API integrations for multiple clients Connected Shopify, WordPress, and third-party APIs for automation Improved backend performance and reduced API failure rates Created scalable Firebase & Supabase backend architectures My focus is always on delivering clean, reliable, and production-ready backend solutions that help businesses scale without technical limitations.