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Nikola Bjelic
Nikola Bjelic

Senior Full Stack Developer | AI Integration Engineer

Actively looking · Member since 21 Oct 2026
Message
Location
Belgrade, Serbia
Desired salary
Unspecified
Work preference
Remote Only
Experience level
Senior

About

Professional summary

I am a Senior Full Stack Developer and AI Integration Engineer with more than 10 years of experience building scalable web applications, SaaS platforms, and production-ready software solutions.

I work across the full development lifecycle, using React, TypeScript, JavaScript, Next.js, Node.js, Express.js, PHP, Laravel, and Python to create maintainable frontend and backend applications.

I have extensive experience designing REST APIs, integrating third-party services, and working with MongoDB, PostgreSQL, MySQL, SQL, and Elasticsearch. I focus on database performance, application reliability, and scalable software architecture.

I use AI-assisted development tools to improve coding, debugging, testing, and technical problem-solving. My AI experience includes OpenAI APIs, LangChain, RAG systems, AI agents, vector databases, prompt engineering, workflow automation, and AI integrations.

I have collaborated with distributed engineering teams, product managers, designers, and international clients. I contribute to technical planning, code reviews, troubleshooting, and the delivery of efficient production solutions.

I also have experience with AWS infrastructure, including Lambda, RDS, S3, and SQS, and enjoy building solutions that combine modern web engineering with AI-powered business workflows.

Skills

36 capabilities
AngularAPI IntegrationCross Functional CollaborationCSS3Data VisualizationDatabase DesignDebuggingElasticsearchHTML5JavaScriptLaravelMongoDBMySQLNext.jsPerformance OptimizationPHPPostgreSQLPrompt EngineeringPythonRAGReactReact NativeReduxREST APIsRxJSSaaS DevelopmentSQLTeam LeadershipTechnical PlanningTestingThird Party IntegrationsTypeScriptVector DatabasesVue.JsWeb Application DevelopmentWorkflow Automation

Tech stack & tools

Working toolkit

Data Stores

MongoDBMySQLPostgreSQL

Design

Storybook

Languages & Frameworks

AngularBootstrapLaravelReact

Libraries

Redux

Monitoring

ElasticsearchRxJS

Experience

Career history

Senior Full Stack Developer / AI Integration Engineer Digital Core Systems

Develop and maintain production full-stack applications using React, TypeScript, Node.js, and Next.js. Build REST APIs, database integrations, and third-party service connections while designing scalable, maintainable application architectures.

Integrate AI capabilities into applications and business workflows, using AI-assisted tools for coding, debugging, testing, and technical problem-solving. Automate development and business processes and collaborate with distributed engineering teams to deliver production-ready solutions.

Senior Full Stack Developer Mainstream

Designed and developed scalable web applications and SaaS platforms. Built frontend applications with React, TypeScript, and Next.js, and developed backend services and REST APIs using Node.js.

Designed and optimized MongoDB, PostgreSQL, and SQL databases. Participated in system architecture, code reviews, and technical planning; integrated third-party services; resolved production issues; and collaborated with product managers, designers, and engineering teams.

Full Stack Developer Capaciteam

Developed full-stack web applications using modern JavaScript technologies. Built responsive frontend applications and backend REST APIs using React, Node.js, MongoDB, and PostgreSQL.

Integrated third-party APIs and external services while improving application performance, reliability, and maintainability. Worked with international clients and distributed development teams.

Junior Software Engineer Quantox Technology

Developed and maintained web applications and business software using JavaScript, HTML, CSS, SQL, and backend technologies. Implemented new features, fixed defects, and improved existing functionality.

Participated in testing, debugging, and code maintenance. Collaborated with developers and project teams on client projects.

Education

Learning history

University of Belgrade

Computer Science & Engineering, Computer Science & Engineering

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