I will build a reliable stripe or authorize net webhook integration

D
david_zhai
D
david_zhai
Yihong Z.
build a reliable stripe or authorize net webhook integration
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build a reliable stripe or authorize net webhook integration
Full Screen
Full Screen
build a reliable stripe or authorize net webhook integrationbuild a reliable stripe or authorize net webhook integrationbuild a reliable stripe or authorize net webhook integration

About this gig

Is your Stripe or Authorize.Net webhook firing twice, double-charging customers, sending duplicate emails, or processing the same order more than once? That is a missing idempotency layer.


I build webhook handlers that are exactly-once by EFFECT. Even if the same event arrives many times, out of order, or your server crashes mid-processing, the result happens once.


What you get:

- Event-id deduplication and an idempotency-key store

- Signature verification, so only genuine events are processed

- Retry-safe, out-of-order-safe handling

- Dead-letter and replay tooling (higher tiers)

- Automated tests, including a duplicate-replay test that proves the fix


Proof before you order: every technique is backed by a public, runnable demo on my GitHub. A chaos harness replays 1000 events and shows N events become 1 effect, with green CI.


Boundaries: I build the idempotency layer only. I never receive or store raw card data (that stays with your gateway), and I do not need live production keys. I use test-mode fixtures.


Tell me which gateway and which events are doubling up, and I will tell you how I would make them exactly-once.

  • Programming language

    • Python

Get to know Yihong Z.

Yihong Z.

Backend Reliability Engineer, Idempotent Webhooks, ETL and LLM Evals

  • FromGermany
  • Member sinceJun 2026

  • Languages

    Chinese, English, German
I'm a backend engineer who fixes the failures that cost money: duplicate webhook charges, ETL jobs that drop or double rows, and LLM features that hallucinate in production. What sets me apart: every service is backed by a public demo with tests and CI on my GitHub, so you can see proof before you order. I work on: - Exactly-once webhooks and payment idempotency - Idempotent ETL and migrations that reconcile to the cent - LLM eval harnesses that catch hallucinations - Scheduling optimization with OR-Tools Rescue jobs start with a paid diagnosis. I keep scope tight and ship tested code.

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