You will get POS / Payments Integration Fix - Toast, Square, Clover, Stripe
Project details
Is your POS or payment integration dropping orders, missing webhooks, or double-charging? I'll find the root cause and fix it.
Senior engineer (14+ years, React + Rails). I built and maintained production POS/payment integrations - Toast, SpotOn, Square - on a platform serving 10,000+ restaurants.
What I'll do:
• Diagnose the real root cause, not just the symptom
• Fix it: missed/duplicate webhooks, order & menu sync drift, failed-payment and price-mismatch edge cases, OAuth/token refresh, idempotent retries
• Add tests so it stays fixed
• Short written summary of what was wrong and what I changed
Works with: Toast, Square, Clover, Lightspeed, SpotOn, Stripe, and custom REST/GraphQL APIs.
Stack: Ruby on Rails, React, PostgreSQL.
Message me with your stack and the symptom before ordering - I'll confirm scope and fit.
Senior engineer (14+ years, React + Rails). I built and maintained production POS/payment integrations - Toast, SpotOn, Square - on a platform serving 10,000+ restaurants.
What I'll do:
• Diagnose the real root cause, not just the symptom
• Fix it: missed/duplicate webhooks, order & menu sync drift, failed-payment and price-mismatch edge cases, OAuth/token refresh, idempotent retries
• Add tests so it stays fixed
• Short written summary of what was wrong and what I changed
Works with: Toast, Square, Clover, Lightspeed, SpotOn, Stripe, and custom REST/GraphQL APIs.
Stack: Ruby on Rails, React, PostgreSQL.
Message me with your stack and the symptom before ordering - I'll confirm scope and fit.
Programming Languages
JavaScript, Ruby/Ruby on Rails, TypeScriptCoding Expertise
Performance Optimization, SecurityWhat's included $600
These options are included with the project scope.
$600
- Delivery Time 6 days
- Number of Revisions 1
About Anton
Senior React + Rails Engineer - SaaS Features & Integrations
Warsaw, Poland - 5:23 am local time
14+ years building web products with React, Rails, TypeScript, and PostgreSQL. Six years as the core engineer on a production SaaS platform: features end-to-end, performance, CI/CD, keeping releases shipping.
What I'm best at:
→ Jumping into an existing codebase and becoming productive in days, not weeks
→ Turning vague requirements into shipped, tested, production-ready features
→ Hunting down hard bugs - database, API, frontend, infrastructure
→ Third-party & POS/payments integrations (Toast, Square, Clover, Stripe, REST/GraphQL, webhooks)
Async-first, clean tested code, clear communication, no hand-holding.
Previously: Senior Engineer at Popmenu (restaurant tech, POS integrations on a platform serving 10,000+ restaurants). 6 years on a production SaaS product.
Open to feature work, bug fixing, legacy rescue, and integrations - hourly or fixed-price.
Steps for completing your project
After purchasing the project, send requirements so Anton can start the project.
Delivery time starts when Anton receives requirements from you.
Anton works on your project following the steps below.
Revisions may occur after the delivery date.
Review your stack, logs, and reproduce the issue
Diagnose the root cause and confirm the fix scope with you