You will get Software Developer/Software Development/Software Engineer/API Integration
Top Rated
Project details
As a Top Rated freelancer on Upwork with over 10 years of experience, I specialize in delivering tailored, high-quality solutions that transform your ideas into reality. My clients appreciate not only the final product but also the efficient process and attention to detail I bring to every project.
I have a proven track record of helping companies succeed by developing enterprise-level applications deployed on cloud platforms, optimizing database performance, and creating automated systems. With a focus on .NET Core, SQL, PHP, and cloud solutions, I help businesses scale and streamline their operations.
Senior Full Stack Developer (MsSql | Mysql | PostgreSql | .NET | PHP)
ā Upwork Top Rated Developer with 10+ years of experience
ā 100% Client Satisfaction & consistent best quality delivery
ā Strong troubleshooting / debugging skills
ā I will help you turn your idea/concept into reality
š¼ Expertise:
Backend: ASP.NET, .NET Core 8.0, C#, PHP, REST APIs, JSON, API integration
Frontend: JavaScript, jQuery, Bootstrap, Blazor
Database: MSSQL, PostgreSQL, MySQL
Cloud: Google Cloud, AWS, Firebase ā APIs, OAuth integration
Mobile: Flutter, .NET MAUI
I have a proven track record of helping companies succeed by developing enterprise-level applications deployed on cloud platforms, optimizing database performance, and creating automated systems. With a focus on .NET Core, SQL, PHP, and cloud solutions, I help businesses scale and streamline their operations.
Senior Full Stack Developer (MsSql | Mysql | PostgreSql | .NET | PHP)
ā Upwork Top Rated Developer with 10+ years of experience
ā 100% Client Satisfaction & consistent best quality delivery
ā Strong troubleshooting / debugging skills
ā I will help you turn your idea/concept into reality
š¼ Expertise:
Backend: ASP.NET, .NET Core 8.0, C#, PHP, REST APIs, JSON, API integration
Frontend: JavaScript, jQuery, Bootstrap, Blazor
Database: MSSQL, PostgreSQL, MySQL
Cloud: Google Cloud, AWS, Firebase ā APIs, OAuth integration
Mobile: Flutter, .NET MAUI
Programming Languages
PHP, Python, ASP.NETCoding Expertise
PSD to HTML, Localization, SecurityWhat's included
| Service Tiers |
Starter
$250
|
Standard
$350
|
Advanced
$2,000
|
|---|---|---|---|
| Delivery Time | 2 days | 4 days | 20 days |
Number of Revisions | 1 | 3 | 9 |
Number of Pages | 3 | 7 | 15 |
Design Customization | - | ||
Content Upload | - | - | |
Responsive Design | |||
Source Code | - | - |
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About GOKHAN
AI Engineer | RAG, LoRA, AI Agents, n8n Automation | NestJS & .NET
100%
Job Success
Istanbul, TurkeyĀ - 3:19 am local time
Most AI projects stall at the same point: the prompt looks great in a test, then breaks against real data, real users, and real infrastructure. I work on the other side of that line ā retrieval that stays grounded, agents that fail predictably, and integrations that hold up under load.
What I build:
RAG and internal knowledge assistants (pgvector, embeddings, self-hosted or API models)
AI agents and workflow automation (n8n, webhooks, CRM and third-party integrations)
Voice AI agents (VAPI, Retell) with telephony, SMS, and CRM integration
Custom GPT / OpenAI assistant workflows and chatbot logic
Multi-tenant SaaS backends that host AI features (NestJS/TypeScript, .NET Core, PostgreSQL)
Prompt architecture, evaluation, and cleanup for systems already in production
Self-hosted LLM deployments where data can't leave the client's infrastructure
Because I come from a backend engineering background, I don't hand over a prompt and stop there. I handle the data layer, the API design, the deployment, and the documentation ā so what you get is a working tool your team can maintain, not a proof of concept.
On Upwork I've earned $40K+ across 1,000+ hours and hold Top Rated Plus status, with a 100% focus on delivery and clear communication. I'm also the founder of Peakersoft, where we build sector-specific SaaS products ā so I understand projects from the product side, not just the code.
If your project needs more implementation bandwidth than a single freelancer, I can coordinate additional development support through Peakersoft.
If you're looking for someone who can scope the AI workflow, build the system, and keep it grounded in something usable, let's talk.
Steps for completing your project
After purchasing the project, send requirements so GOKHAN can start the project.
Delivery time starts when GOKHAN receives requirements from you.
GOKHAN works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement Gathering.
We will gather the project requirement and details from client then on client approval we will start.