Ersin Keser - Founder & Lead Architect

Q: Where is Ersin based?

Ersin is based in Schönefeld, Germany .

Q: What languages does Ersin speak?

Ersin speaks the following languages: Turkish (Native), German (Advanced), English (Advanced) .

Q: How many years of experience does Ersin have?

Ersin has at least 17 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.

Q: What is Ersin's latest experience?

Ersin's most recent position is Founder & Lead Architect at ORBYNT / 7Style .

Q: What companies has Ersin worked for in recent years?

In recent years, Ersin has worked for ORBYNT / 7Style , BrowoAI , GrandLMS / GRADL , MediaMarktSaturn , and Meierhoffer AG .

Q: Which industries is Ersin most experienced in?

Ersin is most experienced in industries like Information Technology , Pharmaceutical , and Chemical . Ersin also has some experience in Retail , Education , and Energy .

Q: Which business areas is Ersin most experienced in?

Ersin is most experienced in business areas like Information Technology , Product Development , and Project Management . Ersin also has some experience in Quality Assurance .

Q: Which industries has Ersin worked in recently?

Ersin has recently worked in industries like Information Technology , Education , and Retail .

Q: Which business areas has Ersin worked in recently?

Ersin has recently worked in business areas like Information Technology , Product Development , and Project Management .

Recommended expert

Schönefeld, Germany

Check rate

Experience

Jan 2025 - Present

1 year 5 months

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 production with paying customers

Jan 2024 - Dec 2025

2 years

Lead Fullstack Developer & AI Architect

BrowoAI

Development of an AI-based business process automation
Microservices architecture with Node.js and Python
Frontend with React and Next.js

Jan 2024 - Dec 2025

2 years

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

Jan 2023 - Dec 2023

1 year

React Native & React Web Developer

MediaMarktSaturn

Development of a mobile app and web app for MediaMarktSaturn employees

Jan 2023 - Dec 2023

1 year

Fullstack Developer

Meierhoffer AG

Development of a hospital patient data management system (PDMS)
Tech-Stack: Vue.js, PHP, Symfony, MSSQL

Jan 2022 - Dec 2022

1 year

Frontend Developer

Otto GmbH

Development of the Shop Rule Creator
Implementation of unit tests, end-to-end tests, and mock servers

Jan 2021 - Dec 2022

2 years

Senior Frontend Developer

Westnetz / EON

Development of custom hooks and GraphQL integrations
Frontend performance optimization

Jan 2021 - Dec 2021

1 year

UI Developer

DPDHL / Deutsche Post

Development of the PostStation DHL UI
API integration and testing

Jan 2020 - Dec 2021

2 years

Fullstack Developer

Appucations GmbH

Development of an Ionic + React mobile app
Backend with PHP/Laravel

Jan 2019 - Dec 2019

1 year

Senior Frontend Developer

Neofonie / Huk-Coburg

Development of web components with Stencil for huk24.de

Jan 2019 - Dec 2019

1 year

React Native Developer

TomTom Telematics / PROAPP

Developed Android and iOS mobile apps with Redux-Saga

Jan 2018 - Dec 2018

1 year

Frontend & ReactJS Developer

Juwelo GmbH

Migrated Flash/Adobe Air to ReactJS

Jan 2017 - Dec 2018

2 years

Fullstack Developer

Envion.org

Developed a crypto ICO platform with Express.js, Redis, React.js, and Redux

Jan 2017 - Dec 2017

1 year

Frontend Developer

RCC / Mercedes-Benz

Optimized performance in the car configurator

Jan 2015 - Present

11 years 5 months

Managing Director & Lead Developer

7Style (own products)

Developed and led the following products:
ORBYNT (AI platform)
Lai LernApp (AI language learning app)
TicketChecker
Drive2Chat

Jan 2013 - Dec 2017

5 years

Senior Web Developer

Bayer Business Services

Development of frontend and backend
Implementation of TeamSite and various APIs

Jan 2009 - Dec 2011

3 years

Web Developer

Bayer AG

Development and maintenance of websites such as lefax.de, bayerpharma.de and adalat.com

Jan 2008 - Dec 2008

1 year

Web Developer

Esanum GmbH

Development of a European physician platform

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Pharmaceutical, Retail, Chemical, Education, and Healthcare.

Information Technology

Pharmaceutical

Retail

Chemical

Education

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.

Information Technology

Product Development

Project Management

Quality Assurance

Summary

Experienced fullstack developer with 28+ years of hands-on experience in software development. 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

Turkish

Native

German

Advanced

English

Advanced

Education

Oct 2000 - Jun 2003

Cloppenburg

High School Diploma · Cloppenburg, Germany

Certifications & licenses

Certificate in accounting principles: HGB, IFRS, US GAAP

Statistics

Experience

Total positions 18

Experience in Information Technology 11.5 y

Avg length 2 y 2 m

Longest experience 11 y 4 m

Expertise

Recent roles Founder & Lead Architect, Lead Fullstack Developer & AI Architect, AI Developer & Project Lead

Main industries Information Technology, Pharmaceutical, Retail

Main business areas Information Technology, Product Development, Project Management

Qualifications

Certifications earned 1

Profile

Created

March 2026

Last Update

March 2026

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Frequently asked questions

Have questions? Find more information here.

Where is Ersin based?

Ersin is based in Schönefeld, Germany.

What languages does Ersin speak?

Ersin speaks the following languages: Turkish (Native), German (Advanced), English (Advanced).

How many years of experience does Ersin have?

Ersin has at least 17 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.

What roles would Ersin be best suited for?

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.

What is Ersin's latest experience?

Ersin's most recent position is Founder & Lead Architect at ORBYNT / 7Style.

What companies has Ersin worked for in recent years?

In recent years, Ersin has worked for ORBYNT / 7Style, BrowoAI, GrandLMS / GRADL, MediaMarktSaturn, and Meierhoffer AG.

Which industries is Ersin most experienced in?

Ersin is most experienced in industries like Information Technology, Pharmaceutical, and Chemical. Ersin also has some experience in Retail, Education, and Energy.

Which business areas is Ersin most experienced in?

Ersin is most experienced in business areas like Information Technology, Product Development, and Project Management. Ersin also has some experience in Quality Assurance.

Which industries has Ersin worked in recently?

Ersin has recently worked in industries like Information Technology, Education, and Retail.

Which business areas has Ersin worked in recently?

Ersin has recently worked in business areas like Information Technology, Product Development, and Project Management.

What is Ersin's education?

Ersin attended Cloppenburg.

Does Ersin have any certificates?

Ersin has 1 certificate: Certificate in accounting principles: HGB, IFRS, US GAAP.

What is the availability of Ersin?

Ersin is immediately available for suitable projects.

What is the rate of Ersin?

Ersin's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.