Website ↔ CRM
Leads, customers, deals and statuses move automatically with duplicate protection.
07
API / WEBHOOKS / INTEGRATIONS
API and systems integration development
I connect websites and business systems through REST APIs, webhooks, queues and reliable synchronization: CRM, payments, Telegram, OpenCart, external services and data imports.
REST APIWebhooksCRMPaymentsQueuesSync
When integration is needed
Data should move automatically and predictably
Integration becomes valuable when teams copy data manually, systems disagree about state or a business process is split across tools.
Catalog ↔ accounting
Prices, stock, products and orders synchronize by clear rules rather than manual spreadsheets.
Service ↔ service
Payments, Telegram, email, documents or external APIs become one managed workflow.
Scope
Contract, reliability and observability
A successful integration is more than the first HTTP 200. Timeouts, duplicates, retries and partial failures need explicit behavior.
01
REST API
Endpoints, schemas, validation, errors, authentication and versioning.
02
Webhooks
Signatures, idempotency, retries, queues and duplicate-delivery protection.
03
Synchronization
Identifier mapping, upsert, conflicts, incremental sync and reconciliation.
04
Payments
Payment creation, callbacks, states, repeated events and secure result handling.
05
CRM / CMS / Telegram
Connect channels and internal systems through explicit contracts.
06
Logs and recovery
Actionable diagnostics, replay and proof that data was not lost.
Process
Design from failure scenarios
Define the source of truth and data moving in each direction.
Map the same entity across systems without duplicates.
Retries, idempotency, queues, timeouts and event ordering.
Make failures visible and safely replayable.
Integration work
Real projects include connected systems
The cases show market data, OpenCart and other external contours rather than static UI.
Trust / How I work
Less uncertainty.
More control.
The stressful part of software is rarely just the price. It is not knowing what is happening, who owns the outcome, or what remains under your control after launch. I design the process to make those things visible from the start.
01
You always know what is happening
The project has clear stages, a current state and a next action. No vague “almost done” status and no technical fog.
02
Source code and access stay with you
The codebase, structure and key credentials do not become leverage. The product can be continued without artificial vendor lock-in.
03
You talk directly to the developer
No manager translating between the problem and the implementation. Context stays intact and decisions can be discussed directly.
04
Risk before code
Before active development, I review scope, integrations, data, critical flows and launch constraints. That is cheaper than repairing the architecture after release.
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FAQ / APIs
What matters before integration
01How much does an API integration cost?+
It depends on documentation quality, entity count, direction of exchange and reliability requirements. Two stateless endpoints and bidirectional sync with conflicts are very different projects.
02Can systems be integrated without a ready API?+
Sometimes through exports, files, webhooks or an intermediary layer, but reliability and support cost must be assessed separately.
03What is idempotency and why does it matter?+
It allows the same event to be received more than once without duplicating an order, payment or record. It is critical for webhooks and payment systems.
04Can synchronization run on a schedule?+
Yes. In some environments scheduled polling is more available or more reliable than realtime webhooks.
Start
Tell me which two systems need to talk
And what should happen on create, update and failure. That is enough to start designing the exchange contract.