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Zeljko I.

@zeljkoi6

4.9
8

5.1

5.1

90%

Top Talented AI | Automation | Software Engineer

$30 USD / Hour

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Flag of

Serbia (4:43 AM)

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Joined on August 6, 2024

$30 USD / Hour

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Innovative and results-oriented Senior AI & Software Engineer with over 7 years of experience in designing, developing, and deploying robust AI-driven applications and full-stack software systems. Highly proficient in machine learning, deep learning, and generative AI, with hands-on expertise in LLMs (OpenAI, GPT, LLaMA), LangChain, RAG (Retrieval-Augmented Generation), TTS/STT, voice cloning, OCR, image/video processing, and natural language processing (NLP). Deep experience in building intelligent systems including chatbots, voice bots, content moderation tools, recommendation engines, and reverse image search pipelines using Python, TensorFlow, PyTorch, scikit-learn, Transformers, spaCy, and Hugging Face. Skilled in building multi-modal applications combining text, audio, and visual inputs. Full-stack expertise across modern web and mobile frameworks: React.js, Vue.js, Node.js, TypeScript, Redux, Flask, Django, FastAPI, Express, Angular, React Native, and Android/iOS native tooling. Capable of developing responsive UI/UX using Bootstrap, Tailwind CSS, and Material UI. Strong command of RESTful APIs, WebSockets, GraphQL, and real-time communication systems. Experienced with cloud infrastructure and DevOps: AWS (EC2, S3, Lambda, SageMaker), Azure, Google Cloud, Firebase, Supabase, Docker, Linux, Nginx, Git, CI/CD pipelines, and deployment of scalable ML services in production. Proficient in data engineering and automation workflows using Pandas, NumPy, BeautifulSoup, OpenCV, Make (Integromat), n8n, and Google Sheets/Excel integrations. Adept at vector search and semantic search technologies using Pinecone, Weaviate, Qdrant, and FAISS. Strong background in databases including PostgreSQL, MySQL, MongoDB, Redis, and Graph databases (Neo4j). Experience in content crawling, parsing, and indexing for use in retrieval systems and knowledge graphs. Comfortable working in agile, cross-functional teams and managing end-to-end project lifecycles—from architecture design and model training to testing, optimization, and deployment. Passionate about delivering AI that adds real value, writing clean, maintainable code, and continuously exploring the latest in Generative AI, LLMs, and multi-agent systems.

Verifications

On time

98%

On budget

98%

Accept rate

42%

Portfolio

Portfolio

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4.9 · 8 Reviews
Reviews
G

Forklift YOLOv8 Dataset Creation • $200 NZD

The programmer deliver a satisfying project

Gert V.

@gertva

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Flag of

Auckland, New Zealand

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2 months ago

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E

Automatización de formulario + Make (o similar) + OpenAI + email para diagnóstico financiero personalizado • $440 USD

Zeljko delivered the project on time, actually one day before, and 100% accurate. Also he will provide ongoing support as part of his great job. Successfully protect. Thanks.

Enrique O.

@enriqueo2

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Flag of

Miami, United States

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3 months ago

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T

Migrate Existing Websites to Astra Template (archived) • £50 GBP

We were misaligned on the project.

Ben B.

@tradepixels

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Flag of

London, United Kingdom

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4 months ago

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Python PDF Extractor for Structured Testing Data • $652 USD

great python ai developer. awesome work!

Vladimir D.

@vladiaz

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Flag of

Caracas, Mexico

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4 months ago

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J

Professional Medical Billing WordPress Site • €155 EUR

Zeljko did an amazing job on my website! He delivered exactly what I needed — clean, professional, and easy to manage. Communication was smooth, and he made revisions quickly. I’m very happy with the final result and would definitely work with him again. Highly recommended!

Former Client (inactive)

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Experience

Senior Web Developer

Jan, 2024 - May, 2024

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4 months

eMenaverse

Jan, 2024 - May, 2024

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4 months

Led the development of web applications for various projects, ensuring high performance and usability. Collaborate with cross-functional teams to design and implement new features based on client requirements. Conduct code reviews and provide technical guidance to junior developers. Optimize website performance and implement security best practices.

Flag of

Dubai, United Arab Emirates

Jan, 2024 - May, 2024

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4 months

Full Stack Developer

Oct, 2021 - Nov, 2023

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2 years, 1 month

Qualysoft

Oct, 2021 - Nov, 2023

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2 years, 1 month

Architected a scalable backend usingNode.js, Express, and MongoDB, achieving 99.9% availability. Led Jira integration for project management, improving collaboration efficiency by 20%. Developed an AI-driven recommendation engine in Python and TensorFlow, boosting user engagement by 20%.

Flag of

Vienna, Austria

Oct, 2021 - Nov, 2023

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2 years, 1 month

Software Engineer

Dec, 2020 - Feb, 2021

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2 months

Rivian

Dec, 2020 - Feb, 2021

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2 months

Spearheaded the end-to-end development and optimization of device firmware, resulting in a 15% improvement in system performance and a 20% reduction in boottime. Applied advanced reverse engineering techniques to analyze and improve existing systems, leading to a 30% reduction in software vulnerabilities and enhancing overall system security.

Flag of

Belgrade, Serbia

Dec, 2020 - Feb, 2021

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2 months

Education

UNIVERSITY OF NOVI SAD

2009 - 2013

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4 years

Bachelor's of Degree in Computer Sciences

Flag of

Serbia

2009 - 2013

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4 years

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