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I’m Aleksandar Kostadnovic, an AI/ML Software Developer and Data Engineer with 7+ years of experience delivering scalable full-stack applications, data pipelines, and enterprise AI solutions. I’m proficient in Python, R, SQL, FastAPI, React, PostgreSQL, and RShiny, and I enjoy turning complex business requirements into secure, high-performance systems. I’ve deployed LLM-powered solutions using GPT-4, LangChain, Retrieval-Augmented Generation, and vector databases for production environments. I design end-to-end architectures, optimize CI/CD and DevSecOps, and collaborate with cross-functional teams to deliver practical GenAI features for enterprise clients.…I’m Aleksandar Kostadnovic, an AI/ML Software Developer and Data Engineer with 7+ years of experience delivering scalable full-stack applications, data pipelines, and enterprise AI solutions. I’m proficient in Python, R, SQL, FastAPI, React, PostgreSQL, and RShiny, and I enjoy turning complex business requirements into secure, high-performance systems. I’ve deployed LLM-powered solutions using GPT-4, LangChain, Retrieval-Augmented Generation, and vector databases for production environments. I design end-to-end architectures, optimize CI/CD and DevSecOps, and collaborate with cross-functional teams to deliver practical GenAI features for enterprise clients.

Aleksandar Kostadnovic

AI Developer, AI Engineer, App Developer, +7

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I’m Aleksandar Kostadnovic, an AI/ML Software Developer and Data Engineer with 7+ years of experience delivering scalable full-stack applications, data pipelines, and enterprise AI solutions. I’m proficient in Python, R, SQL, FastAPI, React, PostgreSQL, and RShiny, and I enjoy turning complex business requirements into secure, high-performance systems. I’ve deployed LLM-powered solutions using GPT-4, LangChain, Retrieval-Augmented Generation, and vector databases for production environments. I design end-to-end architectures, optimize CI/CD and DevSecOps, and collaborate with cross-functional teams to deliver practical GenAI features for enterprise clients.…I’m Aleksandar Kostadnovic, an AI/ML Software Developer and Data Engineer with 7+ years of experience delivering scalable full-stack applications, data pipelines, and enterprise AI solutions. I’m proficient in Python, R, SQL, FastAPI, React, PostgreSQL, and RShiny, and I enjoy turning complex business requirements into secure, high-performance systems. I’ve deployed LLM-powered solutions using GPT-4, LangChain, Retrieval-Augmented Generation, and vector databases for production environments. I design end-to-end architectures, optimize CI/CD and DevSecOps, and collaborate with cross-functional teams to deliver practical GenAI features for enterprise clients.

Available to hire

I’m Aleksandar Kostadnovic, an AI/ML Software Developer and Data Engineer with 7+ years of experience delivering scalable full-stack applications, data pipelines, and enterprise AI solutions. I’m proficient in Python, R, SQL, FastAPI, React, PostgreSQL, and RShiny, and I enjoy turning complex business requirements into secure, high-performance systems.

I’ve deployed LLM-powered solutions using GPT-4, LangChain, Retrieval-Augmented Generation, and vector databases for production environments. I design end-to-end architectures, optimize CI/CD and DevSecOps, and collaborate with cross-functional teams to deliver practical GenAI features for enterprise clients.

Skills

Experience Level

Expert

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Expert

Intermediate

Language

English

Fluent

Work Experience

AI/ML Software Developer at InterImage

April 1, 2023 - February 1, 2026

Designed, built, and scaled data-intensive applications with Generative AI capabilities, delivering end-to-end solutions that integrated LLM technologies into production environments for enterprise clients. Full-stack development with Python (FastAPI) backend and React frontend, RESTful APIs, and optimized PostgreSQL schemas for large-scale data workflows. Implemented LLM-powered features using GPT-4 and LangChain, built RAG pipelines with FAISS, performed prompt engineering, and contributed to model optimization and deployment strategies. Contributed to scalable, distributed architectures and DevSecOps practices, supporting CI/CD pipelines and secure releases.

Data Engineer & AI Engineer (Junior) at Upwork

September 1, 2018 - March 1, 2023

Delivered data analytics and ML-driven insights for clients via Python (pandas, scikit-learn), SQL, and BI tools. E-commerce project: analyzed revenue trends, identified top product categories driving 60% of revenue, and uncovered a 15% decline in repeat purchases. Telecom project: built a churn prediction model with 85% accuracy and identified top churn drivers. Lead scoring project: developed a model achieving 82% accuracy to prioritize high-value prospects, improving sales team efficiency.