Hire the Best CI/CD Freelancers
in Turkey

FREE technical consultation (details below) 🐻 Proud Comsats graduate (Software Enginnering) and an entrepreneurial, reliable full-stack software developer with broad expertise across modern technologies (listed below). I help entrepreneurs, startups, and businesses turn ideas into fully launched products. Whether you need a mobile app on iOS and Android, a scalable web application, or both, I handle everything from initial design to App Store and Play Store deployment. With 7+ years of experience in Full Stack JavaScript/TypeScript and React Native development, I build production ready applications that scale, perform seamlessly, and deliver exceptional user experiences. What I Build ? Mobile Apps: Cross platform iOS and Android apps with React Native, Expo, push notifications, offline sync, in app purchases, real time features, payment integrations, and complete App Store and Play Store publishing. Web Applications: High performance web apps with React, Next.js, Node.js, server side rendering (SSR), static site generation (SSG), responsive design, SEO optimization, and Progressive Web Apps (PWA). AI Powered Solutions: Integration of OpenAI, Claude, Gemini APIs for chatbots, content generation, image creation, speech recognition, natural language processing, and intelligent automation. Tech Stack: Frontend: React, Next.js, React Native, TypeScript, TailwindCSS, Material UI, Shadcn UI, Redux, Zustand, React Query Backend: Node.js, Express, NestJS, Fastify, GraphQL, Socket io, JWT authentication Mobile: Expo, React Navigation, push notifications, biometric auth, deep linking, native modules AI Integration: OpenAI GPT 4, Claude API, Gemini, LangChain, vector databases, RAG systems Databases: PostgreSQL, MongoDB, MySQL, Firebase, Supabase, Redis, Prisma, TypeORM I deliver end to end solutions from wireframes to deployment, ensuring your product is scalable, secure, and ready for users. Let me help you build and launch your next successful product. 𝗦𝗲𝗮𝗿𝗰𝗵 𝗺𝗲 𝘂𝘀𝗶𝗻𝗴 𝗸𝗲𝘆𝘄𝗼𝗿𝗱𝘀: Mobile App Developer, React Native, Swift, Android Development, IOS App development, SaaS Developer, Full Stack SaaS Developer, SaaS Application Developer, SAAS Only, SAAS Development, React Developer, Next.js Developer, JavaScript Developer, TypeScript Developer, Node.js Developer, SaaS Architect, Startup MVP Developer, Software Engineer, Web Application Developer, Product Developer, CRM Developer, ERP Developer, Dashboard Developer, Multi-Tenant SaaS Developer, Subscription Platform Developer, Stripe Integration Expert, API Integration Developer, AI SaaS Developer, Cloud Application Developer, B2B SaaS Developer, SaaS Product Engineer, Full Stack Engineer.

📌📌📌 "WHO" Am I? Hi, I am Serhat! I am a Sr. Software Developer, Project Architect, DevOps/System Engineer with 8 years of experience. I've worked at many enterprise companies as Software Developer and Software Architect for many years. Afterwards, I started to work as Freelancer to give enterprises a software/server support. Now, I am on Upwork to give best quality IT support to individuals and companies. 📌📌📌 "WHY" me? 💯Secure code development & deploying, 💯On-time delivery, 💯Documentation support, 💯Professional support while/after project 📌📌📌 "WHAT" can I do for you? 📂Linux server management & configurations & problem fixing 📂Integrate DevOps & DevSecOps tools 📂Develop secure, stabil and high performance Web Applications & Web APIs 📂Craete monolith or distrubuted software architectures 📂Create database architectres 📌📌📌 My Skills! 💻 Languages ✔C# ✔Python ✔HMTL5 & CSS3 ✔JavaScript ✔SQL ✔Bash & Shell 💻 Frameworks ✔.NET Core (dotnet core / ASP.NET Core) ✔Flask & Flask Restful ✔Django ✔jQuery ✔Wordpress ✔ELK Stack 💻 Databases ✔PosgreSQL ✔MSSQL (Microsoft SQL Server) ✔SQLite ✔MongoDB ✔Redis ✔ElasticSearch 💻 DevOps Tools ✔Docker / Docker Swarm / Kubernetes ✔Gitlab CI/CD ✔Jenkins ✔Ansible 💻 Infrastructure ✔OS: Alpine / Debian / Centos / Ubuntu ✔WEB SERVER: Nginx / Apache ✔BROKERS: RabbitMQ 💻 Clouds ✔Amazon Web Service (AWS) ✔Google Cloud ✔Digital Ocean ✔Cloudflare 💻 Project Management Tools & Metodologies ✔Git (Github/Gitlab/Bitbucket) ✔Agile Tools (Jira / Asana / Trello / Taiga) ✔Communication Tools (Slack / Discord) ✔Agile (Scrum / Kanban / Waterfall) ✔Pair Programming 💻 Development Metodologies & Architectures ✔Clean Code / Refactoring ✔Security Coding ✔SOLID Principles ✔DRY / KISS / YAGNI ✔DDD / TDD / Onion Architecture / Microservice Architecture

🚀 Scalable Solutions & Full Stack Development 🚀 My core focus is Web Development and Product Engineering, including: • Web application and SaaS development • Custom websites and business websites • E-commerce development and integrations • Multi-tenant SaaS architecture • Subscription systems (Stripe billing, recurring payments, usage-based pricing) • Modern frontend apps with Next.js and React • Robust backend APIs with Node.js • Database design (MongoDB, PostgreSQL) • CMS development and headless CMS integrations (WordPress, WPGraphQL, Contentful, Sanity) • Cloud infrastructure and deployments (AWS, S3, etc.) • GitHub-based CI/CD pipelines, automated testing, builds, and deployments What I can help you with: • Building SaaS products from MVP to production • Building custom websites, business websites, and landing pages • Developing e-commerce websites and integrating payment and third-party services • Designing scalable and maintainable system architectures • Implementing authentication, billing, and multi-tenant user management • Developing new features and improving existing products • Integrate AI into your product: from chat assistants and RAG systems to AI-powered workflows. • Optimizing performance and refactoring complex codebases • Taking ownership of the entire development process - from idea to launch I work directly with founders and collaborate seamlessly with product and engineering teams to build scalable SaaS products with clean architecture and fast execution. If you're looking for a full-stack engineer who thinks beyond code and cares about the long-term success of your product, let's talk. --- *Keywords:* 🔸 Full Stack Developer - Next.js Developer - NestJS Developer - TypeScript Developer - Node.js Developer - React Developer - JavaScript Developer - Frontend Developer - Backend Developer 🔸 API Development - REST API - GraphQL API - Microservices - Backend Architecture - Server-Side Development 🔸 PostgreSQL Developer - Database Developer - Supabase Developer - Firebase Developer - Database Design - SQL - Prisma - TypeORM 🔸 MongoDB Developer - MongoDB Development - NoSQL Database - MongoDB Atlas - Mongoose - Database Design - Database Architecture 🔸 AI Developer - AI Integration - LLM Integration - Claude API - ChatGPT Integration - OpenAI Developer - Gemini Integration - Machine Learning Developer 🔸 Chatbot Developer - Chatbot Development - AI Chatbot - Conversational AI - Customer Service Bot - Chat Application 🔸 Cloud Developer - AWS Developer - Serverless Developer - Lambda Developer - Cloud Architecture - DevOps Engineer - CI/CD 🔸 SaaS Developer - SaaS Development - Web Application Developer - Stripe Integration - Mollie Integration - LemonSqueezy Integration - Payment Gateway - Subscription Platform 🔸 Real-Time Developer - WebSocket Developer - Socket io - Live Chat - Real-Time Application - Event-Driven Architecture 🔸 MVP Development - Product Development - Tech Lead - Engineering Manager

Need a web application, automation system, or reliable data-scraping solution? I build production-ready software that helps businesses automate workflows, collect and process data, integrate APIs, and turn ideas into scalable web applications. My core expertise is Python, Django, web scraping, automation, API development, and modern React/Next.js frontends. What I can build for you • Web Scraping & Data Extraction — Scrapy, Playwright, Selenium, BeautifulSoup, Puppeteer • Business Automation — automate repetitive workflows, data processing, reporting, and browser-based tasks • Full-Stack Web Applications — Django/DRF or FastAPI backends with React/Next.js frontends • API Development & Integration — REST APIs, third-party services, payment systems, authentication, and external platforms • AI Integrations — integrate LLMs and AI APIs into existing or new applications • SaaS & Internal Business Tools — dashboards, admin systems, portals, and workflow-management applications • Backend Development — Python, Django, FastAPI, Flask, Node.js • Databases & Deployment — PostgreSQL, MySQL, MongoDB, Docker, Nginx, AWS Why clients work with me ✓ 100% Job Success on Upwork ✓ Top Rated freelancer ✓ Experience building complete systems, not just isolated features ✓ Clean, maintainable and scalable code ✓ Clear communication and reliable delivery I can work on an existing codebase, build a system from scratch, or automate a process that's currently consuming too much of your team's time. Send me a message with what you're trying to build or automate, and I'll help you determine the best technical approach.

✅ Top-Rated Experts ✅ 99%+ Clients Recommendations ✅ Fast, High-quality, and Clean Code ✅ 10+ Long Term Assignments ✅ 30+ Projects ✅ Successful Startup Projects ($300k MRR) ✅ Exclusive Tools for Startups I am leading my development team with 10+ years of development experience. For us, it is crucial to helping entrepreneurs having a proper IT development process. With our top-notch development methodologies, ready-to-use tools, and a wide range of tech-stack, we guarantee 100% project completion in time. Qualifications: ✅ Full-stack web development ✅ Full-stack mobile application development ✅ backend development (web services for games, mobile applications) ✅ SOLID Principles ✅ DDD, TDD, OOP ✅ Lean Development ✅ Agile Software Development Methodologies Technologies: - MEAN, LAMP - Laravel / Lumen (PHP) - Codeigniter (PHP) - NodeJS, ExpressJS, NestJS - Angular, React, Vue, HTML5, CSS3, AngularJS - Ionic, React Native - Firebase - PhaserJS Database: - MySQL - MongoDB Server Architecture: - AWS, Lamda, DynamoDB, EC2, S3 - Google cloud platforms, GKE, GCS - Kubernetes/Helm, Docker CI/CD: - CircleCI

Top 3% Freelancer who built enterprise multi-tenant RAG systems with custom LLM deployments, reduced LLM workflow costs by 70%, and delivered a 2M product data quality pipeline for a Fortune 500 biotech company, reducing manual efforts by 85%. Architected and deployed production systems across finance, biotech, energy, telecommunications, and healthcare. 5+ years taking end-to-end ownership on all projects, from greenfield architecture to secure & scalable production deployment, leading engineers and maintaining systems long-term. I specialize in production-ready AI solutions with measurable ROI. From 90% accuracy voice classification to billion-scale data engineering. Core Expertise: • AI Agents / Agentic Workflows (LangGraph, Tool Calling, Function Calling, Agent Memory Patterns, Agent Patterns, Multi-Agent Orchestration, Building MCP, Plugins, Skills, Hooks, Deterministic Enforcement, ReAct Pattern, AI Assistants, Research, Planning, Writing) • LLM Systems (Claude API, OpenAI API Integration, vLLM, LoRA/QLoRA Fine-Tuning, PEFT, RLHF, DPO, LLaMA, Mistral, Prompt Engineering, Deterministic Workflows, LLM Evaluation, Cost Optimization, Deploying Chatbots, Deploying LLMs, Claude Code, Codex) • RAG (Hybrid Retrieval, Vector Databases, Evaluation Harness, Tiered Access, Custom Document Parsing, PDF/Clinical Data Extraction, Ragas, Multi-Tenancy) • NLP (Transformers, spaCy, Named Entity Recognition, Text Classification, Taxonomy Design, Rule-Based Extraction, Sentiment Analysis, Topic Modeling, Summarization, Information Extraction) • Generative AI (Structured Outputs, Pydantic Validation, Guardrails, Hallucination Prevention, AI Chatbot Development, AI Integration) • ETL & ML Pipelines • Time Series Applications at scale. - I personally prefer native APIs for building Agentic / LLM workflows. Domain Expertise: • Energy & Utilities (demand forecasting, carbon emissions, time series, pricing optimization) • Financial Services (compliance-ready RAG, churn prediction) • Life Sciences (biotech product classification, scientific NER, clinical data extraction, safety) • Telecommunications (voice classification, Whisper, ASR, diarization) Projects - Open source contributor (Langchain vLLM integration fix) - Enterprise RAG Engine with multi-tenancy, project-level isolation, custom vLLM deployments, agent live on the WhatsApp channel - customer support. - Finance-Specific RAG System with compliance features and RAG benchmarking - Enterprise Knowledge Base Chatbots Integrating (RAG daily sync on Notion, Slack, Website, Documents, evals, Live on Zendesk Customer Support Agent, Internal AI Agents on Slack(Deep Research, Q-A, Reporting), Blogpost creation with tone and fact checks.) - Production agentic workflows with state management, semantic processing, and monorepo CI/CD - SEO keyword clustering system processing 10k+ keywords under 10s using OpenAI embeddings + HDBSCAN - Enterprise Misspelling Detection Pipeline for 2M biotech products using FAISS similarity matching and 740k scientific corpus validation (Thermo Fisher) - Real-time Voice Classification System (90% accuracy, active learning pipeline) - Call Recommendation System with statistical engine for optimal calling times - Energy Market Forecast System for Budapest electricity prices - 500+ Class Text Classification with Fine-Tuned BERT - Extending a Lexicon using GloVe Word Embeddings - Databricks PySpark Data Pipeline for Aggregating Billion Scale Data - Time Series Analysis and Models on Energy Consumption Data from different locations in Belgium and Germany - API Integrations & Calculations on Electricity Business Objectives - Imbalanced Binary Classification on Anonymized Data (Oversampling + CatBoost & hGBM) - Data Processing Pipeline for 70m of Electricity Sensor Data for a Research Project Tech Stack: • Programming Languages: Python, SQL • Machine Learning & Deep Learning: TensorFlow, Keras, PyTorch, Scikit-Learn • NLP: LangChain, NLTK, Gensim, FAISS, Pinecone, pgvector • Time-Series: Prophet, TSMixer, ARIMA, SARIMAX, LSTM • MLOps & Data Engineering: Terraform, Linux, Apache Spark, Airflow, Docker, Flask, Streamlit, Gradio, MLflow, W&B, Optuna, CI/CD Pipelines, n8n workflows, Ragas • Cloud: Google (BigQuery, Cloud Functions, Cloud Run, Dataflow, Vertex AI, Firestore, Cloud Storage, Composer) • AWS (Lambda, SageMaker, S3, EC2, ECR, DynamoDB, Glue, CloudWatch) • Azure (Databricks-PySpark) • Database: PostgreSQL, Pinecone, Chroma • Data Manipulation & Statistics: Pandas, NumPy, OpenCV, Regex, SciPy, Statsmodels • Data Visualization: Matplotlib, Plotly • Web Scraping: BeautifulSoup, Requests • Building Custom NER Models & Linking, Question Answering, Text Similarity & Word Embeddings, Part-of-Speech Tagging & Dependency Parsing, Text Generation, Lexical Semantics & N-grams, Clustering • Logistic Regression, SVM, Decision Trees, Random Forest, Gradient Boosting Machines (XGBoost, LightGBM, hGBM), k-NN, CNN, RNN, K-Means, DBSCAN, HDBSCAN, OPTICS