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Jovan S. — Senior AI/LLM Engineer from Serbia

Jovan S.

Senior AI/LLM Engineer

Serbia 6+ years
Open to offersNew to Platform
Languages
English
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About

Jovan S. is an accomplished Senior AI/LLM Engineer and Full-Stack Developer with over nine years of experience in creating AI-powered solutions and comprehensive full-stack platforms. His work includes scaling an AI platform to over 300,000 monthly users and deploying large language model (LLM) driven features that boosted user engagement by 40%. With expertise in AI/LLM engineering (including LangChain, LlamaIndex, RAG pipelines), he has also demonstrated a strong proficiency in full-stack TypeScript using React, Next.js, Node.js, and PostgreSQL. Jovan led significant projects like launching features that streamline candidate matching by 60% and handling extensive data processing volumes. His tenure includes pivotal roles at companies such as 6figr.com, S&B Smart Contract Development LLC, Harrison.ai, Blockchain.com, and Amazon, contributing to fields like blockchain, medical imaging, and financial services. He holds a Master of Science in Data Science from Singidunum University, Serbia.

Experience

  • Head of Engineering, AI Platform

    6figr.com · 2024 — Present
    Scaled an AI platform to 300K+ monthly active users and launched three LLM-powered features—automated candidate scoring, intelligent matching, and predictive analytics—which enhanced user engagement. Designed automation and retrieval workflows that significantly reduced screening time and saved analyst hours. Architected services utilizing Node.js and TypeScript on PostgreSQL and Redis, managing large data volumes with low latency. Engineered Python data ingestion pipelines for processing records from various sources and led a distributed remote engineering team.

  • Full-Stack Engineer

    S&B Smart Contract Development LLC · 2023 — 2023
    Delivered a blockchain marketplace that facilitated transactions for a wide range of digital assets. Developed a generative asset creation pipeline in Python that produced numerous tokenized outputs. Deployed serverless architectures using FastAPI and AWS Lambda, effectively handling a high volume of daily API requests. Rebuilt CI/CD pipelines to enhance deployment frequency and decrease the release cycle duration.

  • Senior Machine Learning Engineer

    Harrison.ai · 2020 — 2023
    Released a diagnostic machine learning system for cancer detection, achieving high recall with a substantial volume of medical images. Improved model accuracy through ensemble methods and transfer learning, utilizing modern neural network frameworks. Created tools for search and triage that greatly reduced the clinician review workload and increased patient throughput. Productionized Python inference services in a containerized environment on AWS ECS to manage daily predictions.

  • Staff Software Engineer

    Blockchain.com · 2019 — 2020
    Enhanced platform security for millions of users through isolation techniques and role-based access controls. Took measures to eliminate vulnerabilities through strategies such as sandboxing, encryption at rest, and network segmentation. Worked on improving the reliability and uptime of essential financial transaction processing services across a global infrastructure.

  • Software Development Engineer

    Amazon · 2017 — 2019
    Developed internal tooling that consolidated various approval workflows and was adopted by over 500 employees. Achieved improvements in operational efficiency by automating manual processes with Python and AWS Step Functions. Reduced approval cycle time significantly through workflow redesign and the implementation of automated validations.