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I'm Eren Şimşir, a developer specializing in API development, Node.js, Python, and machine learning libraries. I build scalable backend systems, databases, and data-driven applications, with experience across the MERN stack and cloud deployments. I enjoy turning complex business needs into robust technical solutions, collaborating with cross-functional teams to optimize workflows, and exploring AI, NLP, and data science to empower informed decision-making.…I'm Eren Şimşir, a developer specializing in API development, Node.js, Python, and machine learning libraries. I build scalable backend systems, databases, and data-driven applications, with experience across the MERN stack and cloud deployments. I enjoy turning complex business needs into robust technical solutions, collaborating with cross-functional teams to optimize workflows, and exploring AI, NLP, and data science to empower informed decision-making.

Eren Şimşir Sakarya

Data Scientist, Back-End Developer, AI Engineer, +2

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I'm Eren Şimşir, a developer specializing in API development, Node.js, Python, and machine learning libraries. I build scalable backend systems, databases, and data-driven applications, with experience across the MERN stack and cloud deployments. I enjoy turning complex business needs into robust technical solutions, collaborating with cross-functional teams to optimize workflows, and exploring AI, NLP, and data science to empower informed decision-making.…I'm Eren Şimşir, a developer specializing in API development, Node.js, Python, and machine learning libraries. I build scalable backend systems, databases, and data-driven applications, with experience across the MERN stack and cloud deployments. I enjoy turning complex business needs into robust technical solutions, collaborating with cross-functional teams to optimize workflows, and exploring AI, NLP, and data science to empower informed decision-making.

Available to hire

I’m Eren Şimşir, a developer specializing in API development, Node.js, Python, and machine learning libraries. I build scalable backend systems, databases, and data-driven applications, with experience across the MERN stack and cloud deployments.

I enjoy turning complex business needs into robust technical solutions, collaborating with cross-functional teams to optimize workflows, and exploring AI, NLP, and data science to empower informed decision-making.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Large Language Models

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Work Experience

Data Scientist at MTK Savunma Sanayi

January 1, 2025 - Present

Worked on data-driven defense projects leveraging Python, ML, and data analysis. Developed AI/ML models to support predictive analytics and decision systems. Conducted visualization and reporting for stakeholders to support defense operations.

Business Analyst at Bluesen se

January 1, 2025 - Present

Analyzed business requirements and transformed them into actionable technical solutions. Collaborated with engineering teams to optimize workflows using SQL, APIs, and dashboards. Supported data-driven decision-making processes with Excel. Collecting data from hospitals / international skin-care centers.

Back-end Developer at Retter.io

January 1, 2024 - Present

Built and maintained scalable back-end systems using Node.js with Retter’s framework. Developed APIs and optimized database structures with NoSQL and MongoDB. Contributed to cloud deployments on Cloud, GCP for SaaS applications.

AI Engineer / LLM Developer (Freelance / Contract) at Remote

January 1, 2022 - Present

Designed multi-turn conversational datasets to fine-tune LLMs with realistic user–assistant dialogues. Created JSON-structured function-calling frameworks with simulated tool usage (calendar, maps, email, automation). Developed pipelines to validate and refine training data for benchmarking and fine-tuning.