Professional API Development | Payment Systems, ERP and Software Integrations
**Professional API Development | Payment Systems, ERP and Software Integrations**
With over 20 years of software development experience, I develop reliable, high-performance and scalable API and integration solutions that connect businesses' different software and platforms to one another.
**Scope of Service:**
**1. API Development and Integration**
* RESTful API design and development
* Integration and modernization of existing APIs
* Third-party service integrations
* Webhooks and real-time data transfer
* OAuth 2.0, JWT and API security
**2. Payment and Banking Integrations**
* Virtual POS and payment infrastructure integrations
* PayTR, iyzico, Stripe and similar payment systems
* Bank APIs and account transaction integration
* Automatic bank statement and transaction transfer
* Processing of DBS, credit card and POS transactions
* Payment reconciliation and financial data synchronization
**3. ERP and Accounting Integrations**
* Logo Netsis, Logo ERP and other ERP systems
* Data transfer between ERP and e-commerce platforms
* Current account, stock, order and invoice integrations
* Automated accounting processes
* Customer-specific business rules and data mapping
* Two-way data synchronization
**4. E-Commerce and Marketplace Integrations**
* Shopify and WooCommerce API integrations
* Trendyol, Hepsiburada, Amazon and other marketplaces
* Product, stock, price and order synchronization
* Shipping and logistics API integrations
**5. Automation and Background Services**
* Windows Service and Linux service development
* Scheduled tasks and automatic data processing
* Queue-based asynchronous processing architectures
* Error handling, logging and automatic retry
* Multi-tenant integration infrastructures
**Technologies I Use:**
Node.js, TypeScript, JavaScript, PHP, Laravel, REST API, PostgreSQL, MySQL, MSSQL, MongoDB, Redis, Docker, AWS, Azure and Linux.
**My Work Process:**
1. **Analysis:** Reviewing existing systems, API documentation and business needs.
2. **Architecture Design:** Preparing the data flow, security structure and integration scenarios.
3. **Development:** Building the API, connection services and necessary automations.
4. **Testing:** Data accuracy, error scenarios, performance and security tests.
5. **Delivery:** Going live, technical documentation and usage briefing.
**Deliverables:**
Depending on the project scope, a working API or integration service, configuration files, API documentation, an error logging mechanism and the necessary setup information are delivered.
**What the Service Does Not Include:**
Third-party API subscriptions, service licenses, and server and cloud infrastructure fees are not included in the service fee. Additional modules, out-of-scope development and ongoing maintenance services are priced separately.
**Why Work With Me?**
I believe an integration should not merely work; it should be secure, sustainable, scalable and resilient to errors.
My goal is to build professional software solutions that reduce manual operations, prevent data loss and adapt to your business's growth.
**Whether you want to connect two systems or build a central integration infrastructure that manages dozens of different platforms, I can offer solutions tailored to your project.**
With over 20 years of software development experience, I develop reliable, high-performance and scalable API and integration solutions that connect businesses' different software and platforms to one another.
**Scope of Service:**
**1. API Development and Integration**
* RESTful API design and development
* Integration and modernization of existing APIs
* Third-party service integrations
* Webhooks and real-time data transfer
* OAuth 2.0, JWT and API security
**2. Payment and Banking Integrations**
* Virtual POS and payment infrastructure integrations
* PayTR, iyzico, Stripe and similar payment systems
* Bank APIs and account transaction integration
* Automatic bank statement and transaction transfer
* Processing of DBS, credit card and POS transactions
* Payment reconciliation and financial data synchronization
**3. ERP and Accounting Integrations**
* Logo Netsis, Logo ERP and other ERP systems
* Data transfer between ERP and e-commerce platforms
* Current account, stock, order and invoice integrations
* Automated accounting processes
* Customer-specific business rules and data mapping
* Two-way data synchronization
**4. E-Commerce and Marketplace Integrations**
* Shopify and WooCommerce API integrations
* Trendyol, Hepsiburada, Amazon and other marketplaces
* Product, stock, price and order synchronization
* Shipping and logistics API integrations
**5. Automation and Background Services**
* Windows Service and Linux service development
* Scheduled tasks and automatic data processing
* Queue-based asynchronous processing architectures
* Error handling, logging and automatic retry
* Multi-tenant integration infrastructures
**Technologies I Use:**
Node.js, TypeScript, JavaScript, PHP, Laravel, REST API, PostgreSQL, MySQL, MSSQL, MongoDB, Redis, Docker, AWS, Azure and Linux.
**My Work Process:**
1. **Analysis:** Reviewing existing systems, API documentation and business needs.
2. **Architecture Design:** Preparing the data flow, security structure and integration scenarios.
3. **Development:** Building the API, connection services and necessary automations.
4. **Testing:** Data accuracy, error scenarios, performance and security tests.
5. **Delivery:** Going live, technical documentation and usage briefing.
**Deliverables:**
Depending on the project scope, a working API or integration service, configuration files, API documentation, an error logging mechanism and the necessary setup information are delivered.
**What the Service Does Not Include:**
Third-party API subscriptions, service licenses, and server and cloud infrastructure fees are not included in the service fee. Additional modules, out-of-scope development and ongoing maintenance services are priced separately.
**Why Work With Me?**
I believe an integration should not merely work; it should be secure, sustainable, scalable and resilient to errors.
My goal is to build professional software solutions that reduce manual operations, prevent data loss and adapt to your business's growth.
**Whether you want to connect two systems or build a central integration infrastructure that manages dozens of different platforms, I can offer solutions tailored to your project.**
Stages of the work
Each stage is approved when delivered, and that stage's share is paid directly to the expert.
- Analysis and Discovery · %10 — Reviewing existing systems, API documentation and business needs; a scope and data flow report.
- Architecture Design · %15 — Design of the data flow, security structure and integration scenarios; an approved architecture document.
- API and Integration Development · %35 — Development of the API, connection services and automations; a working service and configuration files.
- Testing and Verification · %20 — Data accuracy, error scenario, performance and security tests; a test report and fixes.
- Going Live and Delivery · %20 — Delivery of the production cutover, API documentation, error logging mechanism and setup information.