Hello! I'm a frontend developer with 6+ years of experience building modern, scalable applications using React, TypeScript, and Web3. I'm skilled in reusable components, performance optimization, accessibility, and design system architecture.

Nikola Tošić

Hello! I'm a frontend developer with 6+ years of experience building modern, scalable applications using React, TypeScript, and Web3. I'm skilled in reusable components, performance optimization, accessibility, and design system architecture.

Available to hire

Hello! I’m a frontend developer with 6+ years of experience building modern, scalable applications using React, TypeScript, and Web3.

I’m skilled in reusable components, performance optimization, accessibility, and design system architecture.

See more

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
See more

Language

Serbian
Fluent
English
Fluent

Work Experience

Front End Engineer at Createq
August 1, 2019 - Present
Led migration of a large-scale Cold Fusion platform to modular React + TypeScript architecture using Vite, improving performance and maintainability. Built scalable, accessible UIs with MUI, Tailwind CSS, and Storybook; implemented WCAG-compliant interfaces and reusable components across 15+ screens. Implemented complex form flows with react-hook-form, custom validation, i18n, and API integration via Axios; handled business logic for warranty and policy features. Delivered SEO-optimized, high-performance pages in Next.js/React with Hybris and Vue.js integrated into Adobe Experience Manager (AEM); improved responsiveness and page speed across multiple e-commerce platforms. Mentored 10+ junior developers; conducted code reviews; enforced best practices in unit testing (Jest, React Testing Library), ESLint, Prettier, and modular code architecture. Collaborated cross-functionally with designers, QA, and backend engineers across 3+ international markets using Jira, Git, and Confluence.
Frontend Developer Intern at Createq
July 31, 2019 - September 8, 2025
Contributed to UI architecture for 10+ responsive screens; implemented layout and authentication flows used by 30+ internal users. Developed dynamic frontend interfaces using HTML, CSS, JavaScript, and AJAX to support real-time interactions. Participated in 8+ sprint planning sessions and design reviews.
Front End Developer at ZENCHAIN
March 31, 2019 - September 8, 2025
Built 2 decentralized apps using React and integrated Ethereum smart contracts; contributed to modular Web3 component library and wallet connection flows; enhanced modularity and code maintainability across dApps. Developed real-time blockchain interfaces with fallback collateral logic, user alerts, and on-chain event tracking.
Frontend Developer at Flow Ninja
March 31, 2024 - September 8, 2025
Developed core tax calculation logic tailored for US-based freelancers; implemented support for 4 IRS filing statuses with guided input and auto-validation.
Frontend Developer at Reload Mode
June 30, 2024 - September 8, 2025
Built a custom map plugin to visualize 50+ pilgrimage destinations; implemented pin filtering logic for faster and more relevant location selection; applied dynamic route coloring across 20+ paths, improving navigation clarity by ~30%.
Frontend Developer at Four Winds
November 30, 2024 - September 8, 2025
Built 10+ pixel-perfect front-end pages with React and TypeScript; integrated 3+ crypto wallets across Ethereum and Solana ecosystems using Rainbow Kit, Wagmi, and Wallet Adapter; enabled seamless multi-chain support; implemented wallet connection logic and chain-specific hooks.
Front-End Engineer at Createq
August 1, 2019 - Present
Led the migration of a large-scale Cold Fusion platform to a modular React + TypeScript architecture using Vite, improving performance and maintainability. Developed scalable, accessible UIs with MUI, Tailwind CSS, and Storybook, implementing WCAG-compliant interfaces and reusable components across 15+ screens. Implemented complex form flows with React Hook Form, custom validation, i18n, and API integration via Axios, handling business logic for warranty and policy features. Delivered SEO-optimized, high-performance pages in Next.js and React within Hybrid, and Vue.js integrated into Adobe Experience Manager (AEM), improving responsiveness and page speed across multiple e-commerce platforms. Mentored 10+ junior developers, conducted code reviews, and enforced best practices in unit testing (Jest, React Testing Library), ESLint, and Prettier. Collaborated cross-functionally with designers, QA, and back-end engineers across 3+ international markets using Jira, Git, and Confluence.
Frontend Developer Intern at Createq
July 1, 2019 - September 8, 2025
Contributed to UI architecture for 10+ responsive screens, implementing layout and authentication used by 30+ internal users. Developed dynamic frontend interfaces using HTML, CSS, JavaScript, and AJAX to support real-time interactions. Participated in 8+ sprint planning sessions and design reviews, ensuring alignment between frontend delivery and evolving project requirements.
Front-End Developer at ZenChain
March 1, 2019 - September 8, 2025
Built 2 decentralized apps using React and integrated Ethereum smart contracts, contributing to smart contract logic in Solidity. Implemented reusable Web3 components and wallet connection flows, enhancing modularity and code maintainability across dApps. Developed real-time blockchain interfaces with support for fallback collateral logic, user alerts, and on-chain event tracking.
Front End Engineer at Createq
August 1, 2019 - Present
Led migration of a large-scale Cold Fusion platform to a modular React + TypeScript architecture using Vite, improving performance and maintainability. Built scalable, accessible UIs with MUI, Tailwind CSS, and Storybook, implementing WCAG-compliant interfaces and reusable components across 15+ screens. Implemented complex form flows with react-hook-form, custom validation, i18n, and API integration via Axios, handling business logic for warranty and policy features. Delivered SEO-optimized, high-performance pages in Next.js, React within Hybris, and Vue.js integrated into Adobe Experience Manager (AEM), improving responsiveness and page speed across multiple e-commerce platforms. Mentored 10+ junior developers, conducted code reviews, and enforced best practices in unit testing (Jest, React Testing Library), ESLint, Prettier, and modular code architecture. Collaborated cross-functionally with designers, QA, and backend engineers across 3+ international markets using agile tools like J
Frontend Intern at Createq
July 1, 2019 - September 8, 2025
Contributed to UI architecture for 10+ responsive screens, used by 30+ internal users. Developed dynamic front-end interfaces using HTML, CSS, JavaScript, and AJAX to support real-time interactions. Participated in 8+ sprint planning sessions and design reviews.
Front End Developer at Zenchain
March 1, 2019 - September 8, 2025
Built 2 decentralized applications using React and integrated Ethereum smart contracts, contributing to smart contract logic in Solidity. Implemented reusable Web3 components and wallet connection flows, enhancing modularity and code maintainability across dApps. Developed real-time blockchain interfaces with support for fallback collateral logic, user alerts, and on-chain event tracking.
Front-End Engineer at Createq
August 1, 2019 - Present
Led the migration of a large-scale ColdFusion platform to a modular React + TypeScript architecture using Vite, improving performance and maintainability. Built scalable, accessible UIs with MUI, Tailwind CSS, and Storybook, implementing WCAG-compliant interfaces and reusable components across 15+ screens. Implemented complex form workflows with react-hook-form, i18n, and API integration via Axios, handling business logic for warranty and policy features. Delivered SEO-optimized, high-performance pages in Next.js and React within Hybris/AEM environments, enhancing responsiveness across multiple e-commerce platforms. Mentored 10+ junior developers, conducted code reviews, and enforced best practices in unit testing (Jest, React Testing Library), ESLint, and modular code architecture. Collaborated cross-functionally with designers, QA, and backend engineers across 3+ international markets using Jira, Git, and Confluence.
Frontend Developer Intern at Createq
July 31, 2019 - September 8, 2025
Contributed to UI architecture for 10+ responsive screens, implementing layout and authentication logic used by 30+ internal users. Developed dynamic frontend interfaces using HTML, CSS, JavaScript, and AJAX to support real-time interactions. Participated in 8+ sprint planning sessions and design reviews, ensuring alignment between frontend delivery and evolving project requirements.
Front End Developer at Zenchain
March 31, 2019 - September 8, 2025
Built 2 decentralized applications using React and integrated Ethereum smart contracts, contributing to smart contract logic in Solidity. Implemented reusable Web3 components and wallet connection flows (Wagmi, RainbowKit) to improve modularity and maintainability across dApps. Developed real-time blockchain interfaces with support for fall-back collateral logic, user alerts, and on-chain event tracking.

Education

Bachelor of Science in Computer Science at Faculty of Electronic Engineering, University of Niš
January 11, 2030 - January 1, 2020
Bachelor of Science in Computer Science at Faculty of Electronic Engineering, University of Niš
January 11, 2030 - January 1, 2020
Bachelor of Science in Computer Science at Faculty of Electronic Engineering, University of Niš
January 11, 2030 - January 1, 2020
Bachelor of Science in Computer Science at Faculty of Electronic Engineering, University of Niš
January 11, 2030 - January 1, 2020

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Media & Entertainment, Professional Services