I am a Senior Fullstack Engineer with 10+ years of experience building scalable, production-grade web applications and backend systems. I have core experience across backend, frontend, and relational databases, with a strong focus on performance, reliability, and maintainability. I specialize in designing robust APIs, optimizing data-intensive applications, and integrating complex systems. I am comfortable across the full stack with emphasis on backend performance, data modeling, and system reliability. I am a strong advocate of clean code and engineering best practices, with hands-on experience in code reviews, testing, and mentoring developers. Recently I have focused on modern SaaS development and applying AI tools to improve development efficiency.

Boris Ružić

I am a Senior Fullstack Engineer with 10+ years of experience building scalable, production-grade web applications and backend systems. I have core experience across backend, frontend, and relational databases, with a strong focus on performance, reliability, and maintainability. I specialize in designing robust APIs, optimizing data-intensive applications, and integrating complex systems. I am comfortable across the full stack with emphasis on backend performance, data modeling, and system reliability. I am a strong advocate of clean code and engineering best practices, with hands-on experience in code reviews, testing, and mentoring developers. Recently I have focused on modern SaaS development and applying AI tools to improve development efficiency.

Available to hire

I am a Senior Fullstack Engineer with 10+ years of experience building scalable, production-grade web applications and backend systems. I have core experience across backend, frontend, and relational databases, with a strong focus on performance, reliability, and maintainability. I specialize in designing robust APIs, optimizing data-intensive applications, and integrating complex systems.

I am comfortable across the full stack with emphasis on backend performance, data modeling, and system reliability. I am a strong advocate of clean code and engineering best practices, with hands-on experience in code reviews, testing, and mentoring developers. Recently I have focused on modern SaaS development and applying AI tools to improve development efficiency.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate

Language

Serbian
Fluent
German
Advanced
English
Fluent

Work Experience

External Full Stack Developer at Molecular Health
July 1, 2017 - August 1, 2020
Analyzed current database model, improved SQL views, functions and procedures inside SAP HANA and PostgreSQL. Implemented services (XS OData, REST APIs). Developed back-end functionalities in Node.js and XSJS. Enhanced front-end with React JS and SAPUI5. Implemented unit and integration tests (Enzyme, Jest, Mocha). Created project documentation.
Full Stack Developer at Contrimo GmbH
March 1, 2016 - October 1, 2025
Extracted requirements and translated them into functional/technical specifications. Developed and maintained web applications, contributed to code reviews and testing within an agile team. Designed and optimized database schemas for improved data storage. Implemented SAP Cloud apps and APIs (RESTful, OData) and integrated them with frontend components. Led a small team, participated in planning and cross-team collaboration.
External Full Stack Developer at Sybit GmbH
September 1, 2021 - February 1, 2022
Worked on React/TypeScript/CSS tech stack; implemented SAP UI5, XS OData/REST APIs; built backend with Node.js/XSJS; wrote unit and integration tests (Enzyme, Jest, Mocha); created project documentation.
Web Developer at Implementek
November 1, 2012 - May 1, 2013
Web application development, project documentation, client support. Implemented YouTube, Google Analytics, Facebook APIs integrations; worked with SQL, XML, PostgreSQL, SAP CAP and SAP HANA; built responsive web designs using AWS, NestJs, Redux, Bootstrap; worked with WordPress, osCommerce, Joomla CMS.

Education

Master Degree in Information Systems at Faculty of Organizational Sciences, Belgrade
October 1, 2008 - August 1, 2012
Graduate Engineer of Organizational Sciences at Faculty of Organizational Sciences, Belgrade
October 1, 2012 - April 1, 2014

Qualifications

Claude Code in Action – Anthropic
January 1, 2026 - April 23, 2026

Industry Experience

Software & Internet, Professional Services, Computers & Electronics