Available to hire
Hi, I’m Petar Scepanovic. I’m a Senior Full Stack Developer based in Belgrade, Serbia, with a track record of engineering and deploying scalable, high-performance web applications using React, TypeScript, and Node.js. I excel at optimizing system architecture to drive business outcomes, demonstrated by reducing post-deployment bugs by 40% and eliminating 80% of redundant API calls. I also bring a rare blend of deep technical expertise and leadership, backed by a Master’s in HR that helps me navigate team dynamics and stakeholder communication with an agile mindset.
In my current and previous roles, I accelerated feature development, shortened onboarding time for new engineers, and improved stability through strategic testing and architecture choices. I’m always eager to collaborate with cross-functional teams to deliver reliable software and delightful user experiences.
Skills
Language
English
Fluent
Serbian
Fluent
Work Experience
Full Stack Developer at Zühlke
February 1, 2024 - June 8, 2024Led full-stack web application development, owning front-end architecture, component design, and implementation to ensure scalability and maintainability, including Next.js server-side development. Improved application performance and user experience significantly. Collaborated closely with back-end developers to deliver complex features aligned with stringent codebase standards, including C# related tasks to streamline integration processes. Contributed actively to architectural and feature design discussions to enhance system efficiency and adaptability. Conducted thorough code reviews and resolved critical bugs, reducing technical debt and improving overall code quality.
Frontend Developer at BlueGrid
May 1, 2021 - September 30, 2023Built highly responsive Single Page Applications (SPAs) using React, matching design specifications and enhancing user engagement. Implemented advanced React architectures that measurably improved application performance and usability. Collaborated with UX designers to translate wireframes and mockups into seamless user experiences, increasing user satisfaction. Performed rigorous bug fixes and comprehensive code reviews, maintaining a high-quality codebase and minimizing post-release issues.
Frontend Developer at OMP
October 1, 2020 - March 31, 2021Contributed to the frontend team’s efforts to reshape user experience, impacting user interaction and satisfaction positively. Developed and implemented new features using modern web development practices in React (React Hooks and TypeScript), enhancing application functionality and responsiveness.
Full Stack Developer at Zühlke
February 1, 2024 - PresentLed full stack web app development, owning front-end architecture, component design, and implementation for scalability and maintainability, including Next.js server-side development. Collaborated with back-end developers to deliver features aligned with codebase standards, including working on C# related tasks. Contributed to architectural and feature design discussions, ensuring optimal implementation. Conducted thorough code reviews and resolved bugs, reducing technical debt.
Frontend Developer at BlueGrid
September 30, 2023 - July 24, 2025Built responsive single page applications using React to match design specifications. Implemented React architectures improving performance and usability. Collaborated with UX designers to enhance user experience. Performed bug fixes and conducted code reviews to maintain high-quality codebase.
Frontend Developer at OMP
March 31, 2021 - July 24, 2025Contributed to frontend team efforts to reshape user experience. Developed features using modern web development practices including React hooks and TypeScript.
Full Stack Developer at Zühlke
February 1, 2024 - PresentCombated recurring production instability by authoring and scaling an end-to-end testing strategy using Playwright, directly reducing critical post-deployment bugs by 40% and enhancing product stability. Drove team-wide adoption of a new component-based architecture, accelerating feature velocity by 20% and improving team scalability by reducing onboarding time. Established new code quality standards by overhauling the code review process with standardized checklists and ESLint, reducing merge conflicts by 30%, and mentoring the team on best practices. Engineered critical backend microservices in C# to resolve cross-team data consistency issues, ensuring seamless API integration that supported the successful launch of three new product features.
Frontend Developer at BlueGrid
September 30, 2023 - August 5, 2025Architected and led a complete state management refactor from Redux to React Query, eliminating 80% of redundant API calls and cutting perceived latency by 40% on data-intensive dashboards. Partnered with UX/UI teams to lead frontend development for three responsive Single-Page Applications serving over 20,000 monthly active users, contributing to a 15% improvement in user task completion rates.
Frontend Developer at OMP
March 31, 2021 - August 5, 2025Contributed to a major refactoring initiative on a core enterprise product by implementing key features with React Hooks and TypeScript to improve performance, code reusability, and maintainability.
Full Stack Developer at Zühlke
February 1, 2024 - PresentAccelerated feature development velocity by 20% and reduced new engineer onboarding time by 30% by pioneering the adoption of a new component-based architecture using React and Next.js. Reduced critical post-deployment bugs by 40% through architecting and scaling a new end-to-end testing strategy with Playwright, directly enhancing product stability and user trust. Decreased code review cycle time by 15% and cut merge conflicts by 30% by overhauling the code review process, leveraging HR principles to implement standardized checklists that improved team collaboration. Enabled the successful launch of 3 new product features by engineering a new backend service architecture that resolved cross-team data consistency issues and ensured seamless API integration.
Frontend Developer at BlueGrid
September 30, 2023 - September 3, 2025Eliminated 80% of redundant API calls and cut perceived user latency by 40% across data-intensive dashboards by orchestrating a complete state management refactor from Redux to React Query. Improved user task completion rates by 15% for a platform serving over 20,000 monthly active users by leading frontend development for 3 responsive Single-Page Applications in collaboration with UX/UI designers.
Frontend Developer at OMP
March 31, 2021 - September 3, 2025Reduced component rendering time by 25% and significantly improved code maintainability by executing a targeted refactoring of a core enterprise product, migrating legacy components to React Hooks and TypeScript.
Senior Full Stack Developer at Zühlke
February 1, 2024 - PresentAccelerated feature development velocity by 20% and reduced onboarding time by 30% by pioneering a component-based architecture using React and Next.js. Reduced critical post-deployment bugs by 40% through architecting and scaling a new end-to-end testing strategy with Playwright, boosting product stability and user trust. Decreased code review cycle time by 15% and cut merge conflicts by 30% by overhauling the code review process and implementing standardized checklists for better team collaboration. Enabled the successful launch of 3 new product features by engineering a backend service architecture that resolved cross-team data consistency issues and ensured seamless API integration.
Frontend Developer at BlueGrid
September 1, 2023 - September 29, 2025Eliminated 80% of redundant API calls and cut perceived latency by 40% across data-intensive dashboards by orchestrating a complete state management refactor from Redux to React Query. Improved user task completion rates by 15% for a platform serving 20,000+ monthly active users by leading frontend development for 3 responsive Single-Page Applications in collaboration with UX/UI designers.
Frontend Developer at OMP
March 1, 2021 - September 29, 2025Reduced component rendering time by 25% and significantly improved code maintainability by refactoring a core enterprise product, migrating legacy components to React Hooks and TypeScript.
Full Stack Developer at Zühlke
February 1, 2024 - PresentAccelerated feature development velocity by 20% and cut new engineer onboarding time by 30% by pioneering the adoption of a component-based architecture using React and Next.js.
Frontend Developer at BlueGrid
September 1, 2023 - October 2, 2025Eliminated 80% of redundant API calls and cut perceived latency by 40% across data-intensive dashboards by orchestrating a complete state management refactor from Redux to React Query.
Frontend Developer at OMP
March 1, 2021 - October 2, 2025Reduced component rendering time by 25% and significantly improved code maintainability by migrating legacy components to React Hooks and TypeScript for a core enterprise product.
Full Stack Developer at Zühlke
February 1, 2024 - PresentAccelerated feature development velocity by 20% and cut new engineer onboarding time by 30% by pioneering the adoption of a new component-based architecture using React and Next.js. Reduced critical post-deployment bugs by 40% by architecting and scaling a new end-to-end testing strategy with Playwright, directly enhancing product stability and user trust.
Front End Developer at BlueGrid
September 1, 2023 - October 2, 2025Eliminated 80% of redundant API calls and cut perceived latency by 40% across data-intensive dashboards by orchestrating a complete state management refactor from Redux to React Query. Improved user task completion rate by 15% for a platform serving 20,000+ monthly active users by leading front-end development for 3 responsive single-page applications in collaboration with UX/UI designers.
Front End Developer at OMP
March 1, 2021 - October 2, 2025Reduced component rendering time by 25% and significantly improved code maintainability by executing a targeted refactoring of a core enterprise product, migrating legacy components to React Hooks and TypeScript.
Education
Master’s at University of Belgrade
January 1, 2007 - December 31, 2008Bachelor’s at European University
January 1, 2003 - December 31, 2007Master’s at University of Belgrade
January 1, 2007 - December 31, 2008Bachelor’s at European University
January 1, 2003 - December 31, 2007Full Stack Web Development & Computer Science at Lambda School
January 11, 2030 - August 5, 2025Web Development, IT Bootcamp at Belgrade, Serbia
January 11, 2030 - August 5, 2025M.S., Human Resources Management at University of Belgrade, Serbia
January 11, 2030 - August 5, 2025B.S., International Management at European University, Belgrade, Serbia
January 11, 2030 - August 5, 2025Full Stack Web Development & Computer Science at Lambda School
January 11, 2030 - September 3, 2025Web Development at IT Bootcamp, Belgrade, Serbia
January 11, 2030 - September 3, 2025M.S., Human Resources Management at University of Belgrade, Serbia
January 11, 2030 - September 3, 2025B.S., International Management at European University, Belgrade, Serbia
January 11, 2030 - September 3, 2025Full Stack Web Development & Computer Science at Lambda School
January 11, 2030 - September 29, 2025Web Development, IT Bootcamp at Belgrade, Serbia
January 11, 2030 - September 29, 2025M.S., Human Resources Management at University of Belgrade
January 11, 2030 - September 29, 2025B.S., International Management at European University
January 11, 2030 - September 29, 2025Full Stack Web Development & Computer Science at Lambda School
January 11, 2030 - October 2, 2025Web Development at Belgrade IT Bootcamp
January 11, 2030 - October 2, 2025M.S., Human Resources Management at University of Belgrade
January 11, 2030 - October 2, 2025B.S., International Management at European University Belgrade
January 11, 2030 - October 2, 2025Master of Science in Human Resources Management at University of Belgrade, Serbia
January 11, 2030 - October 2, 2025Bachelor of Science in International Management at European University, Belgrade, Serbia
January 11, 2030 - October 2, 2025Full Stack Web Development & Computer Science at Lambda School (Remote)
January 11, 2030 - October 2, 2025Qualifications
Certificate in Advanced English (CAE)
January 11, 2030 - July 7, 2025Certificate in Advanced English (CAE), Cambridge University
January 11, 2030 - July 24, 2025EU Passport (Croatia)
January 11, 2030 - August 5, 2025Serbian Citizenship
January 11, 2030 - August 5, 2025Industry Experience
Software & Internet, Professional Services, Education
Skills
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