Mansur is available for hire
Hire MansurMansur Segmen
Verified Expert in Engineering
Full-stack Developer
Istanbul, Turkey
Toptal member since May 3, 2021
Bio
Mansur is a full-stack product engineer and technical lead with over 7 years of experience shipping software across mobile, web, and cloud. He has led small teams, owned product roadmaps end-to-end, and taken SaaS products from zero to production. Mansur primarily works with Flutter and Firebase, and has back-end experience across multiple stacks.
Portfolio
Individual Health Systems AS
Flutter, Firebase, Firebase Hosting, Firebase Analytics, Cloud Firestore...
bobdo.com GmbH
Flutter, Firebase, Material UI, Push Notifications, Functions, PHP, PHP 7...
FNBTech, Inc
Flutter, Java, React Native, Figma, Android, iOS, Mobile App Development...
Experience
- Dart - 7 years
- JavaScript - 7 years
- Node.js - 7 years
- Firebase - 7 years
- Flutter - 7 years
- Android - 4 years
- Java - 3 years
- Kotlin - 3 years
Preferred Environment
MacOS, Slack, Jira, Android Studio, Visual Studio Code (VS Code)
The most amazing...
...thing I've worked on is an online game with over 20 million registered users.
Work Experience
Lead Developer
2023 - PRESENT
Individual Health Systems AS
- Led a team of 3 developers and oversaw all technical decisions for a pharmacy SaaS platform combining eCommerce, warehouse management, and pharmacy operations for pharmacies in Norway.
- Architected the platform as a modular monorepo with isolated packages for authentication, payments, warehouse management, and RBAC, enabling the team to develop and test features independently.
- Built end-to-end order processing and Stripe payment/subscription infrastructure integrated with Firebase Cloud Functions, handling purchases, invoicing, and recurring billing.
- Implemented a points-based loyalty rewards system with configurable strategies for milestones like first delivery and long-term retention, driving over 300 active subscriptions through a partner campaign (Eurobonus).
Technologies: Flutter, Firebase, Firebase Hosting, Firebase Analytics, Cloud Firestore, Google Cloud, Google Cloud Storage, Warehouse Management System (WMS), Order Management, Subscriptions, Stripe, Agora, Algolia, TypeScript, SaaS, Shorebird, PostNord, SendGrid, GitHub Actions, Magento, Magento API, GraphQL, Gemini API, Large Language Models (LLMs), Full-stack
Flutter Developer
2022 - 2025
bobdo.com GmbH
- Owned and continuously shipped a multi-platform consultant management and sales enablement system (Flutter and Firebase) used daily by over 2,000 consultants for commission tracking, provisions, and sales operations.
- Built a commission and reward engine with configurable bonus calculations, rank eligibility logic, and result simulations for a network sales organization.
- Developed sales analytics dashboards and leaderboards with performance tracking, giving management visibility into team output and individual consultant metrics.
Technologies: Flutter, Firebase, Material UI, Push Notifications, Functions, PHP, PHP 7, WordPress, WordPress API, REST, APNs, Firebase Cloud Messaging (FCM), HTML, TypeScript, Mobile Applications, Mobile Development, Databases, Cross-platform, JavaScript, TypeScript 3, Clean Code, REST APIs, Agora, Shorebird, Algolia, Firebase Analytics, Full-stack
Flutter Developer
2022 - 2024
FNBTech, Inc
- Migrated the flagship product from React Native to Flutter, reducing maintenance overhead and accelerating feature delivery.
- Led development of three core products within a SaaS ecosystem.
- Implemented real-time cloud synchronization over WebSockets with offline-first local storage, achieving zero data loss across low-connectivity warehouse environments.
Technologies: Flutter, Java, React Native, Figma, Android, iOS, Mobile App Development, Material Design, Pixel Perfect, REST, Cookies, SaaS, Mobile Applications, Mobile Development, Databases, Cross-platform, Clean Code, REST APIs, WebSockets, Full-stack
Mobile Developer
2021 - 2022
UpliftNow, Inc.
- Refactored the whole app to sound null-safety and migrated to the flutter_bloc package.
- Identified performance problems using profiling tools and fixed them, resulting in a 25% increase in frames per second, achieving a stable 120 FPS.
- Fixed long-running Firebase performance issues that caused very long loading times.
- Maintained and improved the existing GitHub Actions CI/CD pipeline.
- Implemented a WYSIWYG editor for the specific needs of the client.
Technologies: Flutter, Swift, Kotlin, Mobile, Firebase, GitHub Actions, Mobile Applications, Mobile Development, Cross-platform, Push Notifications, Local Notifications, Clean Code, REST APIs, Full-stack
Full-stack Flutter Developer
2021 - 2021
Synodic
- Developed the podcast creation part of the app that supports recording with multiple people using WebRTC and audio manipulation using FFmpeg.
- Worked closely with the client to understand the business needs.
- Analyzed root causes of bugs, troubleshot issues, and offered better solutions.
Technologies: Flutter, Push Notifications, Local Notifications, GraphQL, Jupyter Notebook, AWS AppSync, WebRTC, FFmpeg, AWS Lambda, NoSQL, Mobile App Development, Figma, Mobile, App Store, GitLab, Minimum Viable Product (MVP), Mobile Applications, Mobile Development, Databases, APIs, Prototyping, REST APIs, Clean Code, AWS Amplify, Amazon Web Services (AWS), Full-stack
Flutter Developer
2021 - 2021
Codeway Studios
- Developed a mindfulness app from scratch that sends daily affirmations to the users.
- Implemented some of the app's key features and got involved in the decision-making.
- Developed an analytics package in Dart for my company that works on any platform, halving the development and maintenance time.
Technologies: Dart, Flutter, Java, Kotlin, Vue, Node.js, Firebase, Firebase Web SDK, NoSQL, Mobile App Development, Figma, Mobile, GitHub, JavaScript, TypeScript, Git, JSON, HTML, CSS, Dashboards, Web Dashboards, Admin Panels, Cross-platform, Mobile Development, Clean Code, REST APIs, Full-stack
Full-stack Flutter Developer
2020 - 2020
Glonera (Freelance)
- Developed an app from scratch that suggests cosmetic products to users based on their traits and preferences.
- Planned, developed, and deployed the app while adding new functionality to the WordPress website.
- Implemented a headless CMS solution with WordPress to provide an easier transition if the client decides to migrate the front end of the website to Flutter.
Technologies: Flutter, WordPress, PHP, MySQL, JSON Web Tokens (JWT), REST, Firebase, Firebase Web SDK, SQL, Mobile App Development, Mobile Development, Mobile Applications, Databases, Minimum Viable Product (MVP), Cross-platform, Git, Apps, REST APIs, Full-stack
Full-stack Android Developer
2019 - 2020
Sociable Inc.
- Developed an app that lets users have video calls and match with random people.
- Built a better architecture to solve slow development and difficult maintenance issues.
- Developed and maintained games and their back-end services.
Technologies: Android Studio, Android, Model View ViewModel (MVVM), Node.js, LibGDX, Kotlin, Java, Architecture, MongoDB, Mobile App Development, Zeplin, WebSockets, Mobile Development, Back-end, Game Back-end, Apps, Git, Crashlytics, Firebase, Full-stack
Software Developer
2018 - 2019
Oyun Studyosu
- Developed an admin panel that handles game support, user management, and in-game events.
- Refactored and modified old code to be used in the new game.
- Fixed bugs and added features to the game's back end.
Technologies: Java, Spring, AngularJS, Web Development, HTML, CSS, Git, JSON, Unity, Admin Panels, Dashboards, Web Dashboards, Front-end, Front-end Development, Back-end, Game Back-end, Apps, Full-stack
Experience
Craftable Labor (iOS)
https://apps.apple.com/us/app/craftable-labor/id1642784459A Flutter-based app that helps its Labor module subscribers accurately view employee information, per-outlet and per-shift schedules, and insight into labor opportunities. As the only developer on the mobile side, I architected and built the app from scratch.
This is the iOS version, which is available on the App Store.
This is the iOS version, which is available on the App Store.
Craftable Labor (Android)
https://play.google.com/store/apps/details?id=com.craftable.employee&hl=en&gl=USA Flutter-based app that helps its Labor module subscribers accurately view employee information, per-outlet and per-shift schedules, and insight into labor opportunities. As the only developer on the mobile side, I architected and built the app from scratch.
This is the Android version, which is available on Google Play.
This is the Android version, which is available on Google Play.
Craftable Inventory (iOS)
https://apps.apple.com/tr/app/craftable-inventory/id1633413960A Flutter-based cross-platform app implemented using the BLoC pattern with inventory management features, such as creating and managing audits. It also has features like barcode scanning with a device camera, real-time communication with WebSockets, and local storage to achieve zero data loss.
This is the iOS version, which is available on the App Store.
This is the iOS version, which is available on the App Store.
Craftable Inventory (Android)
https://play.google.com/store/apps/details?id=com.craftable.mobileinventoryA Flutter-based cross-platform app implemented using the BLoC pattern with inventory management features, such as creating and managing audits. It also has features like barcode scanning with a device camera, real-time communication with WebSockets, and local storage to achieve zero data loss.
This is the Android version, which is available on Google Play.
This is the Android version, which is available on Google Play.
Tell Me
A Flutter-based app that tells daily affirmations to users. I acted as a full-stack developer, and along with implementing the Flutter front end of the app, I implemented a web panel with Vue.js and Node.js stack to help manage content. I worked with the Firebase database and storage as the back end.
Glonera
A Flutter-based app that suggests cosmetic products to users based on their preferences by asking questions. I transformed the WordPress website into a cross-platform app while adding new features, such as a better product search algorithm, social login, and performance.
Hola Random Chat
https://holaapp.coA video chat app that randomly matches people and lets them play games and text each other. It has over 1,000,000 downloads on Google Play Store. I worked as a full-stack developer building a quiz game in native Android, a backgammon game with LibGDX and their back ends. I implemented in-app texting and user profiles along with many screens.
Synodic
An audio social network for creating and sharing audio content. Users can record solo or with their friends, edit, add background tracks, and share them. I worked on the audio recording functionalities and managed the development and release of the app while working closely with the client to understand the business needs.
Education
2017 - 2021
Coursework Toward a Bachelor's Degree in Computer Engineering
Bogazici University - Istanbul, Turkey
Skills
Libraries/APIs
Node.js, Firebase Web SDK, WebRTC, FFmpeg, Vue, WordPress API, REST APIs, AWS Amplify, Stripe
Tools
Android Studio, Figma, Git, GitHub, GitLab, Firebase Cloud Messaging (FCM), Slack, Jira, Zeplin, AWS AppSync, Crashlytics, Agora, Firebase Analytics, SendGrid
Languages
Dart, Kotlin, HTML, CSS, JavaScript, SQL, Java, TypeScript, GraphQL, PHP, Swift, PHP 7, TypeScript 3
Frameworks
Flutter, JSON Web Tokens (JWT), Material UI, LibGDX, Spring, AngularJS, React Native, Unity
Paradigms
Model View ViewModel (MVVM), REST, Cross-platform, Mobile Development, Clean Code
Platforms
Firebase, Visual Studio Code (VS Code), Android, iOS, Mobile, MacOS, AWS Lambda, WordPress, Jupyter Notebook, Amazon Web Services (AWS), Algolia, Magento, Magento API
Storage
NoSQL, JSON, MySQL, MongoDB, Databases, Cloud Firestore, Google Cloud, Google Cloud Storage
Other
Architecture, Push Notifications, Local Notifications, Mobile App Development, Front-end, Apps, Material Design, Pixel Perfect, Application State Management, Mobile Applications, APIs, Minimum Viable Product (MVP), Full-stack, WebSockets, App Store, Google Play Store, GitHub Actions, SaaS, Video Streaming, Web Development, Amazon Neptune, Functions, APNs, Cookies, Admin Panels, Dashboards, Web Dashboards, Front-end Development, Back-end, Game Back-end, Prototyping, Firebase Hosting, Warehouse Management System (WMS), Order Management, Subscriptions, Shorebird, PostNord, Gemini API, Large Language Models (LLMs)
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