Ersin Keser-Founder & Lead Architect
Check rate
Experience
Founder & Lead Architect
ORBYNT / 7Style
- Full automation of the software development process: ticket analysis → AI coding agents → pull request → automated code review → deployment
- Multi-tenant architecture with 82 database models and real-time WebSocket monitoring
- Integration of 40+ AI tools with Claude & GPT
- Tech stack: React, TypeScript, Express.js, PostgreSQL, Redis, BullMQ
- Platform in productive use with paying customers
Lead Fullstack Developer & AI Architect
BrowoAI
- Development of AI-based business process automation
- Microservices architecture with Node.js and Python
- Frontend with React and Next.js
AI Developer & Project Lead
GrandLMS / GRADL
- Development of an AI-powered learning management system
- OpenAI fine-tuning, LangChain, and embeddings
- Tech stack: React, Next.js
React Native & React Web Developer
MediaMarktSaturn
- Development of a mobile app and web app for MediaMarktSaturn employees
Fullstack Developer
Meierhoffer AG
- Development of a hospital patient data management system (PDMS)
- Tech stack: Vue.js, PHP, Symfony, MSSQL
Frontend Developer
Otto GmbH
- Development of the Shop Rule Creator
- Implementation of unit tests, end-to-end tests, and mock servers
Senior Frontend Developer
Westnetz / EON
- Development of custom hooks and GraphQL integrations
- Frontend performance optimization
UI Developer
DPDHL / Deutsche Post
- Development of the PostStation DHL UI
- API integration and testing
Fullstack Developer
Appucations GmbH
- Development of an Ionic + React mobile app
- Backend with PHP/Laravel
Senior Frontend Developer
Neofonie / Huk-Coburg
- Development of web components with Stencil for huk24.de
React Native Developer
TomTom Telematics / PROAPP
- Development of Android and iOS mobile apps with Redux-Saga
Frontend & ReactJS Developer
Juwelo GmbH
- Migration from Flash/AdobeAir to ReactJS
Fullstack Developer
Envion.org
- Development of a crypto ICO platform with Express.js, Redis, React.js, and Redux
Frontend Developer
RCC / Mercedes-Benz
- Performance optimization in the car configurator
Managing Director & Lead Developer
7Style (own products)
- Development and management of the following products:
- ORBYNT (AI platform)
- Lai learning app (AI language learning app)
- TicketChecker
- Drive2Chat
Senior Web Developer
Bayer Business Services
- Development of frontend and backend
- Implementation of TeamSite and various APIs
Web Developer
Bayer AG
- Development and maintenance of websites such as lefax.de, bayerpharma.de, and adalat.com
Web Developer
Esanum GmbH
- Development of a European doctors' platform
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Pharmaceutical, Retail, Chemical, Education, and Healthcare.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Project Management, and Quality Assurance.
Summary
Experienced fullstack developer with 28+ years of hands-on software development experience. Specialized in React/TypeScript frontends, Node.js/PHP backends, and AI integration. Enterprise experience at Bayer AG, Mercedes-Benz, Otto, Deutsche Post DHL, and MediaMarktSaturn.
Skills
- Frontend: React, Next.Js, Typescript, Vue.Js, React Native, Angular, Tailwind Css, Stencil
- Backend: Node.Js, Express.Js, Php, Laravel, Symfony, Python, Graphql, Rest
- Ai/Ml: Openai (Gpt, Fine-Tuning), Claude/Anthropic, Langchain, Embeddings, Llm Integration
- Databases: Postgresql, Mysql, Mssql, Redis
- Devops: Docker, Nginx, Github Actions, Ci/Cd
Languages
Education
Cloppenburg
High school diploma · Cloppenburg, Germany
Certifications & licenses
Certificate in accounting knowledge HGB, IFRS, US GAAP
Statistics
Experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Ersin is based in Schönefeld, Germany.
Ersin speaks the following languages: Turkish (Native), German (Advanced), English (Advanced).
Ersin has at least 18 years of experience. During this time, Ersin has worked in at least 13 different roles and for 18 different companies. The average length of individual experience is 1 year. Note that Ersin may not have shared all experience and actually has more experience.
Based on recent experience, Ersin would be well-suited for roles such as: Founder & Lead Architect, Lead Fullstack Developer & AI Architect, AI Developer & Project Lead.
Ersin's most recent position is Founder & Lead Architect at ORBYNT / 7Style.
In recent years, Ersin has worked for ORBYNT / 7Style, BrowoAI, GrandLMS / GRADL, MediaMarktSaturn, and Meierhoffer AG.
Ersin is most experienced in industries like Information Technology, Pharmaceutical, and Chemical. Ersin also has some experience in Retail, Education, and Energy.
Ersin is most experienced in business areas like Information Technology, Product Development, and Project Management. Ersin also has some experience in Quality Assurance.
Ersin has recently worked in industries like Information Technology, Education, and Retail.
Ersin has recently worked in business areas like Information Technology, Product Development, and Project Management.
Ersin attended Cloppenburg.
Ersin has 1 certificate: Certificate in accounting knowledge HGB, IFRS, US GAAP.
Ersin is immediately available full-time for suitable projects.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 25 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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