I am a Senior Full-Stack Developer with a proven track record delivering scalable SaaS platforms and AI-driven solutions. I specialize in Python, Django, FastAPI, and REST/GraphQL APIs, with strong experience across .NET, Java, and cloud-native architectures that scale to millions of users. I love collaborating with international clients, designing robust back-ends, building modular front-ends, and optimizing data flows. I have led CI/CD pipelines, automated testing, and AI/LLM integrations, including building RAG chatbots and AI assistants that serve thousands of weekly users, while continually expanding into cloud DevOps and AI-powered workflows.…

MarkoLukic96

I am a Senior Full-Stack Developer with a proven track record delivering scalable SaaS platforms and AI-driven solutions. I specialize in Python, Django, FastAPI, and REST/GraphQL APIs, with strong experience across .NET, Java, and cloud-native architectures that scale to millions of users. I love collaborating with international clients, designing robust back-ends, building modular front-ends, and optimizing data flows. I have led CI/CD pipelines, automated testing, and AI/LLM integrations, including building RAG chatbots and AI assistants that serve thousands of weekly users, while continually expanding into cloud DevOps and AI-powered workflows.…

Available to hire

I am a Senior Full-Stack Developer with a proven track record delivering scalable SaaS platforms and AI-driven solutions. I specialize in Python, Django, FastAPI, and REST/GraphQL APIs, with strong experience across .NET, Java, and cloud-native architectures that scale to millions of users.

I love collaborating with international clients, designing robust back-ends, building modular front-ends, and optimizing data flows. I have led CI/CD pipelines, automated testing, and AI/LLM integrations, including building RAG chatbots and AI assistants that serve thousands of weekly users, while continually expanding into cloud DevOps and AI-powered workflows.

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Skills

Experience Level

Java
Expert
Python
Expert
SQL
Expert
Spring
Expert
Django
Expert
Express
Expert
React JS
Expert
PostgreSQL
Expert
Node.js
Expert
MongoDB
Expert
Docker
Expert
GitHub
Expert
MySQL
Expert
AWS
Expert
Redis
Expert
JavaScript
Expert
GraphQL
Expert
Kubernetes
Expert
Azure
Expert
TypeScript
Expert
Jira
Expert
React Native
Expert
ETL
Expert
Selenium
Expert
.NET
Expert
Tailwind
Intermediate
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Language

English
Fluent
Serbian
Fluent

Work Experience

Senior Full Stack Developer at BairesDev
February 1, 2022 - Present
Collaborated directly with international clients on 4 projects, gaining early exposure to client communication, requirements gathering, and feedback cycles. Designed modular React.js front-ends reducing UI bug rates by 30%. Built scalable Node.js/Express.js APIs with PostgreSQL and MongoDB handling 200k+ daily requests and supporting multi-region traffic. Integrated AI/LLMs enabling intelligent assistants used by 10k+ weekly customers. Developed a RAG chatbot with Azure Cognitive Search indexing 10k+ documents for 95% multi-turn conversation accuracy. Built Python ETL pipelines processing 100k+ daily content entries from social media, reducing enrichment times by 40%. Configured Datadog monitoring reducing downtime by 20%. Optimized Redis Pub/Sub for zero message loss. Implemented automated test coverage with Cypress and Jest. Mentored and partnered with product managers and leadership to analyze 25+ features improving engagement by 20%. Hosted internal AI workshops with 50 engineering
Full Stack Developer at HTEC Group
January 31, 2022 - September 4, 2025
Delivered real-time analytics dashboards built with React and Node.js, improving decision-making speed by 35%. Built GraphQL APIs over MongoDB and PostgreSQL, cutting query response times by 25%. Migrated backend services from Node.js/Express.js to Django/Python, reducing latency by 20% while supporting 10k+ requests per minute. Designed cloud pipelines on AWS processing 1TB, reducing costs by 15%. Automated testing with Jest and Cypress adding 100+ tests. Collaborated with internal teams improving onboarding and consistency. Improved team CI/CD pipelines with GitHub Actions, reducing deployment failures by 30%. Presented MERN stack best practices internally and mentored 20 engineers. Supported client demos for 10 accounts.
Junior Full Stack Developer at Quantox Technology
January 31, 2020 - September 4, 2025
Began career as a MERN stack developer contributing to 10 projects for international fintech, e-commerce, and media clients. Designed and built REST and GraphQL APIs with Express.js serving 5k+ daily users, improving data flow speed and system performance by 75% through Redis caching and optimized queries. Delivered multilingual e-commerce platforms with MongoDB backends supporting 50k+ monthly transactions across Europe and Asia. Integrated into MERN applications raising partner adoption success rates by 60%. Built responsive React.js frontends improving cross-team productivity by 20%. Developed and maintained unit tests with Jest reaching 85% code coverage. Participated in sprints with 95% completion rate and consistently delivered features on time. Supported hackathons as a mentor helping 30 participants build their first web applications. Learned CI/CD pipelines, Docker containerization, and Git workflows laying the foundation for DevOps practices. Assisted senior engineers deployi
Senior Full-Stack Developer at BairesDev
February 1, 2022 - Present
Collaborated with international clients on 4 projects, gaining early exposure to client communication, requirements gathering, and feedback cycles. Designed modular Jinja2 front-end with improved UI reliability, built REST and GraphQL APIs using Django and FastAPI, migrated backends to PostgreSQL and SQLite, and integrated Odoo with third-party systems via XML and e-commerce platforms. Implemented AI/LLM-powered assistants with Azure Cognitive Search indexing 10k+ documents, delivering 95% multi-turn conversions. Built cloud-native pipelines and emphasized CI/CD, monitoring, and performance improvements.
Junior Full-Stack Developer at Quantox Technology
January 31, 2022 - September 14, 2025
Began career as a MERN stack developer contributing to SaaS projects for international clients across fintech, e-commerce, and media sectors. Designed and built REST and GraphQL APIs with Express.js, served daily users, and improved data flow speeds by approximately 75%. Delivered multilingual e-commerce platforms with a MongoDB backend, supporting monthly transactions across Europe and Asia. Migrated back-ends to FastAPI and Django REST Framework APIs with PostgreSQL, integrating third-party SDKs into MERN apps. Built AWS-based cloud pipelines and implemented automated tests to accelerate delivery.

Education

Bachelor's Degree in Computer Science at University of Belgrade
October 2, 2014 - July 11, 2018
Bachelor (Osnovne akademske studije) at International School of Belgrade
September 7, 2011 - October 8, 2014
Bachelor's Degree in Computer Science at University of Belgrade
January 11, 2030 - October 1, 2014

Qualifications

PCAP Certified Associate in Python Programming
January 11, 2030 - September 2, 2025
PCAP Certified Associate in Python Programming
January 11, 2030 - September 14, 2025

Industry Experience

Software & Internet, Financial Services, Media & Entertainment, Retail, Professional Services, Education
    paper LLM Integration, Scalable APIs, and Real-Time Dashboards

    We are building a next-generation SaaS platform enhanced with AI/LLM capabilities and are looking for an experienced full-stack developer to join our team. The goal is to combine robust cloud-native architecture with intelligent AI solutions that deliver real business impact.

    You will contribute to developing intelligent assistants and chatbots, automating workflows with OpenAI, Azure OpenAI, Claude, and Cohere, and building real-time SaaS features such as dashboards, analytics, and collaboration tools. The platform will run on AWS/GCP/Azure with Kubernetes, Docker, CI/CD pipelines, and advanced monitoring to ensure scalability and reliability.

    Our core stack includes Python (FastAPI, Django, Flask), PostgreSQL, Redis, and Celery on the backend, with React/Next.js, TypeScript, and TailwindCSS on the frontend. We are looking for developers who have experience with SaaS architecture, AI/LLM integrations, and cloud-native deployments, and who can deliver production-ready, test-covered features.

    This is an opportunity to work on cutting-edge AI-powered applications used by thousands of users worldwide. If you are passionate about bridging software engineering and AI innovation, we’d love to collaborate with you.