Milan is available for hire
Hire MilanMilan Popovic
Verified Expert in Engineering
Software Developer
Belgrade, Serbia
Toptal member since August 20, 2026
Bio
Milan has spent 9 years building mobile solutions across telecommunications, banking, and streaming industries. His toolkit centers on React Native, Next.js, and Node.js. While at NCR Voyix, Milan onboarded 8 engineers and led a team transition that resulted in more productive sprints than with the previous vendor.
Portfolio
Proximus
React Native, TypeScript, GitHub Actions, Claude Code, GitHub Copilot...
BezimeniIT
React Native, React, Next.js, Payload CMS, Node.js, Solution Architecture...
An Online Freelance Agency
React Native, React, TypeScript, Next.js, NestJS, Remix, Payload CMS, Node.js...
Experience
- Mobile Development - 9 years
- Software Development - 9 years
- React - 8 years
- React Native - 8 years
- Web Development - 7 years
- TypeScript - 6 years
- Next.js - 3 years
- Payload CMS - 2 years
Preferred Environment
Jira, Confluence, Figma, GitHub
The most amazing...
...thing I've architected is a streaming platform, enabling modular layouts and leading a team of 7 developers to deliver a scalable solution for industry clients.
Work Experience
React Native Developer
2026 - PRESENT
Proximus
- Worked on the migration from Medix to a React Native app.
- Implemented a modular page with onboarding authorization and widgets.
- Integrated New Best Offer, New Best Action, and Content Hub integration to show articles.
Technologies: React Native, TypeScript, GitHub Actions, Claude Code, GitHub Copilot, React Native Testing Library, Jest, Redux, React Redux, Cross-platform App Development, iOS, Agentic Coding, AI-assisted Development, Clean Code, Product Ownership, Mobile App Security, Authentication, iOS Authentication, Videos, Role-based Access Control (RBAC), Row-level Security (RLS), OAuth
Technical Consultant & Solution Architect
2025 - PRESENT
BezimeniIT
- Clarified client ideas, created user journeys, scoped work, technical roadmap, and defined the most important features.
- Defined architecture of full applications with architectural diagram, database diagram, and technical documentation for integration.
- Launched a streaming platform in 3 months and reached 15,000 active users in the 1st month of deployment without any critical issues or out-of-service problems. Great performance for the whole world.
Technologies: React Native, React, Next.js, Payload CMS, Node.js, Solution Architecture, Stripe, Stripe API, Google Analytics, Google Analytics 4 (GA4), Accessibility, Software Architecture, System Architecture, Cross-platform App Development, Claude, Android, iOS, Product Management, Communication, Server-side Rendering (SSR), Agentic Coding, CTO, Architecture, Team Leadership & Supervision, Technical Leadership, Startups, AI-assisted Development, Clean Code, CMS, Leadership, Systems Design, Product Ownership, Mobile App Security, Minimum Viable Product (MVP), Authentication, iOS Authentication, SQLite, Email Authentication, ChatGPT, Codex, AI Development, Videos, Role-based Access Control (RBAC), Row-level Security (RLS), OAuth
Web & Mobile Developer & Solution Architect
2017 - PRESENT
An Online Freelance Agency
- Worked on CoinATMRadar: showed all crypto ATMs on the map, handled map integration, and big data optimization for the map. (React Native).
- Developed KULT: made a Web3 solution for crowdfunding agencies to help young people achieve goals and receive tokens. (NestJS – Node.js and React).
- Built The Pump, a workout program app with explanation videos and program sheets. Implemented CI via GitHub with Over The Air update and classic releases. (React Native).
- Created the Pump Admin panel, a business logic for handling all client needs. (Remix – React and Node.js).
- Implemented the Concours Club, a resort app with HID services for Bluetooth door management of the racing truck garage, dining reservations, and events management. (React Native).
- Architected Streaming Platform. Created the architecture and database model for a subscription-based streaming platform with integration of 3rd-party marketing agencies. Led 7 developers in building the client app (NextJS) and CMS app (PayloadCMS).
- Built a rafting reservation system by myself from scratch for a rafting camp—client reservations with payment confirmation and partner reservations without client confirmations.
- Developed the rafting reservation admin dashboard with tracking of free rooms and easy changing of them. Included cost, earnings, and profit calculations.
- Created the rafting reservation operation portal for workers to know how many meals and activities they need to prepare and where to put people.
- Integrated a rafting reservation bar integration for tracking what is happening in the bar and with clients who just come over without reservations. Developed an email upload and review mechanism to automatically get reviews and media from clients.
Technologies: React Native, React, TypeScript, Next.js, NestJS, Remix, Payload CMS, Node.js, Express.js, Mobile Development, Web Development, Software Development, Solution Architecture, Full-stack Development, Full-stack, Mobile, PostgreSQL, Supabase, Vercel, Google Maps, Google Maps API, Tailwind CSS, SaaS, Accessibility, Back-end, Front-end, Software Architecture, System Architecture, Artificial Intelligence (AI), Claude API, ChatGPT API, AI Automation, Agentic AI, AI Agents, Redux, React Redux, Application State Management, REST APIs, RESTFul APIs, Zustand, Jest, Cross-platform App Development, Android, iOS, HTML5, Prototyping, AI Tools, Product Management, Workflow Automation, Large Language Models (LLMs), Vibe Coding, Integration, In-app Purchase (IAP), In-app Purchases, Subscriptions, Subscription Management, Front-end Development, React Native Testing Library, React Testing Library, Webpack, Stripe Connect API, TestFlight, AI Integration, Supabase Auth, Server-side Rendering (SSR), Playwright, Agentic Coding, Architecture, Team Leadership & Supervision, Technical Leadership, Startups, AI-assisted Development, Clean Code, CMS, Leadership, Systems Design, Product Ownership, Firebase Authentication, Mobile App Security, Pub/Sub, Authentication, iOS Authentication, SQLite, Email Authentication, ChatGPT, Codex, AI Development, Videos, Role-based Access Control (RBAC), Row-level Security (RLS), OAuth
React Native Developer
2025 - 2026
Screen Solutions
- Implemented Next.js with React Native Web on an already built mobile and TV app to make the same system work on all platforms.
- Launched the 1st version for the web with all functionalities that the mobile and old web app had.
- Implemented a modular layout system for app design on mobile and web apps.
- Implemented Claude Code skills to have strong knowledge of best practices with coding and project guidelines.
- Automated agents to pull Jira, Confluence, and Figma data about tickets so Claude Code can automatically start planning and working on them.
- Contributed to new OTT features and AI development skill improvements.
Technologies: React Native, Next.js, TypeScript, Claude Code, GitHub Copilot, Mobile Development, Accessibility, React Native Testing Library, Workflow Automation, Over-the-top Content (OTT), Video Players, Video Streaming, Analytics, Performance, Push Notifications, User Authentication, User Experience (UX), App Store Acceptance Process, Agentic Coding, Architecture, AI-assisted Development, Clean Code, Product Ownership, Mobile App Security, Authentication, iOS Authentication, Videos, Role-based Access Control (RBAC), Row-level Security (RLS), OAuth
Tech Lead & React Native Developer
2023 - 2025
Candescent
- Learned the whole system, successfully onboarded 8 people, and the team took the work from the outsource company that started this project in 6 months, with more productive sprints than before.
- Contributed to a full modular architecture, personalized and configured for each client differently.
- Learned the banking process for the USA. Worked on each module of the banking process.
- Built new banking modules from scratch. Developed native modules for 3rd-party integrations.
- Implemented bank functionality into the Vision OS app that worked in 3D space with Apple Vision Pro goggles.
Technologies: React Native, Nx, TypeScript, GitHub Actions, GitHub CLI, API Integration, APIs, Fintech, Accessibility, React Native Testing Library, Clean Architecture, Analytics, Integration, Push Notifications, Performance, Scalability, Security, User Authentication, Architecture, Finance, Team Leadership & Supervision, Technical Leadership, Clean Code, Leadership, Systems Design, Product Ownership, Mobile App Security, Authentication, iOS Authentication, Role-based Access Control (RBAC), Row-level Security (RLS), OAuth
React Native Developer
2020 - 2023
Xogito Group
- Refactored the distillery shop auction app to use new technology standards. Used React Native.
- Developed a school app integrating Okta, Google, and SMS services for 2-factor authentication. Addressed performance issues with data caching and images. Used React Native.
- Built BrainBump, a spaced repetition content memory app from scratch with 1 back-end developer; publicly available. Used React Native.
- Created an authentication flow in the native module of Android and iOS for security. Made map integration, presenting all ATM. Implemented the React Native Web version.
Technologies: React Native, Mobile Development, Mobile App Development, Firebase, Git, Architecture, Finance, Startups, Clean Code, Firebase Authentication, Mobile App Security, Authentication, iOS Authentication, Role-based Access Control (RBAC), Row-level Security (RLS), OAuth
Web & Mobile Lead Developer
2017 - 2020
Netcast
- Developed Android and iOS apps for watching IPTV with full integration of streaming services and optimized data synchronization. Integrated Realm, Watermelon, React-query, and MMKV storage. Optimized list rendering. Used React Native.
- Built a full infrastructure web portal for administration and customer management, including statistics. Used React.
- Developed a web portal for watching IPTV with full streaming service integration. Performed constant refactoring using Hooks and react-query. Used React.
- Created Android SetBox application for watching TV, including past shows viewing and schema display. Optimized big data handling for low-performance SetBox. Used Native Android.
- Developed a back-end microservice in Spring Boot for monitoring user actions on SetBoxes.
Technologies: React Native, Spring Boot, Android, React, TypeScript, Over-the-top Content (OTT), Analytics, Push Notifications, Performance, Scalability, User Authentication, Security, Video Players, Video Streaming, TV, Media, Streaming, Front-end Development, Server-side Rendering (SSR), Team Leadership & Supervision, Technical Leadership, Leadership, Mobile App Security, Authentication, iOS Authentication, SQLite, Videos, Row-level Security (RLS), OAuth
Consultant Software Developer
2016 - 2016
Avnet
- Developed software for an insurance company in the BCPL programming language.
- Wrote low-level programming code with unprotected memory access using an in-house database.
- Completed 1 month of training in the UK, where we learned how low-level memory and databases are made and how to implement and use them.
Technologies: Programming
Teaching Assistant
2015 - 2015
Studentska Organizacija VIŠER
- Taught practical work in C# .NET Form application to students as an assistant on the subject "Techniques of visual programming."
- Instructed students in XAML, C# .NET, and Windows Universal Application development.
- Guided students through the process of Windows Universal Application Development.
Technologies: C#, XAML
Experience
BrainBump
https://brainbumpapp.com/BrainBump helps people remember key ideas from their favorite content, be it a book, blog, podcast, talk, or even a class, using spaced repetition. I built this from scratch with 1 back-end developer. It is publicly available.
The Pump
https://arnoldspumpclub.com/pages/the-pump-club-appI contributed to a workout app from Arnold Schwarzenegger that includes workout plans, reps, and weight tracking. It also features subscriptions and payments, a work history, and video tutorials, with progress tracking and motivation to improve.
Pickx TV
https://www.proximus.be/en/id_catb_tv/self-employed-and-small-companies/other-products-and-options/tv-options/proximus-pickx.htmlI contributed to a streaming platform in Belgium for OTT TV. Users can watch their TV shows and movies on demand. It has player integration and localization protection, and a full schema of programs and new TV shows, and movies that users can enjoy.
The Concours Club
https://theconcoursclub.com/An app for a resort with a racing track and a garage for supercars. I worked on implementing HID services for Bluetooth door management at the racing truck garage, dining reservations, and event management.
Tech: React Native
Tech: React Native
Education
2012 - 2016
Bachelor's Degree in Computer Science
The School of Electrical and Computer Engineering of Applied Studies - Belgrade, Serbia
Skills
Libraries/APIs
React, React Native Testing Library, React Redux, REST APIs, React Hook Form, React Testing Library, Node.js, Claude API, React Native for Web, Google Maps, Google Maps API, Stripe, Stripe API, Stripe Connect API, Playwright
Tools
Jira, Confluence, GitHub, Claude Code, Claude, Git, TestFlight, Firebase Authentication, ChatGPT, Codex, Figma, Nx, GitHub Copilot, Expo, Google Analytics, Webpack, GitHub CLI
Languages
TypeScript, HTML, CSS, JavaScript, Java, HTML5, C#, XAML, Python, PHP, C, C++, SQL, GraphQL, Kotlin, Swift
Frameworks
React Native, Redux, Jest, Next.js, Remix, Payload CMS, NestJS, Tailwind CSS, .NET, Spring Boot, Bootstrap, Express.js
Paradigms
Mobile Development, Clean Code, Role-based Access Control (RBAC), Clean Architecture
Platforms
Android, Mobile, iOS, Firebase, Vercel
Storage
SQLite, PostgreSQL, Realm, MongoDB
Other
Software Development, Web Development, React Native Reanimated, React Native Navigation, API Integration, APIs, Accessibility, SaaS, Application State Management, RESTFul APIs, Zustand, Cross-platform App Development, Google Play Store, App Store, Prototyping, AI Tools, Product Management, Communication, Over-the-top Content (OTT), Analytics, Push Notifications, Performance, User Authentication, Video Players, Video Streaming, App Store Acceptance Process, Integration, Mobile App Development, Media, Streaming, Agentic Coding, Team Leadership & Supervision, Technical Leadership, Startups, AI-assisted Development, CMS, Leadership, Product Ownership, Mobile App Security, Minimum Viable Product (MVP), Authentication, iOS Authentication, Email Authentication, Videos, Row-level Security (RLS), OAuth, GitHub Actions, Mobile UX, Mobile UI, Solution Architecture, Full-stack Development, Full-stack, Supabase, Fintech, Google Analytics 4 (GA4), Front-end, Software Architecture, System Architecture, Artificial Intelligence (AI), ChatGPT API, AI Automation, Agentic AI, AI Agents, User Interface (UI), User Experience (UX), Workflow Automation, Large Language Models (LLMs), Vibe Coding, Scalability, Security, In-app Purchase (IAP), In-app Purchases, Subscriptions, Subscription Management, TV, Front-end Development, Supabase Auth, Offline Data Synchronization, Server-side Rendering (SSR), CTO, Architecture, Finance, Systems Design, Pub/Sub, AI Development, Bluetooth, Programming, Back-end, AI Integration
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