Jakub is available for hire
Hire JakubJakub Neukirch
Verified Expert in Engineering
Mobile Developer
Świętochłowice, Poland
Toptal member since December 14, 2021
Bio
Jakub is a skilled mobile developer with 7+ years of experience in Flutter and Android, specializing in Android development and clean architecture to improve extendability. He integrates multiple technologies into his projects, including REST APIs, Firebase, and Bluetooth scanners. Jakub is known for creating future-driven solutions—developing basic and complex applications, programming libraries, and custom Android widgets—and has helped many small businesses build mobile apps.
Portfolio
Craig Fransen
Flutter, Dart, Mobile Development, Camera API, React, Redux, Firebase
NOCAP Inc
Android, Kotlin, Mobile Applications, Jetpack Compose, Dependency Injection...
Puul
Mobile Development, Technical Leadership, React Native, Software Architecture...
Experience
- Java - 5 years
- Android - 5 years
- Android SDK - 5 years
- Technical Leadership - 4 years
- Flutter - 3 years
- Kotlin - 3 years
- Dart - 3 years
- Firebase - 2 years
Availability
Full-time
Preferred Environment
MacOS, Slack, Discord, Android Studio
The most amazing...
...project I've worked on is a pharmacy inventory app with multiple 2D code scanning devices that used Zebra Scanner Smartphone for scanning drugs.
Work Experience
Flutter Developer (via Toptal)
2023 - PRESENT
Craig Fransen
- Implemented a camera component for the Flutter app. The camera was in-app and had a fully customizable UI.
- Handled all possible error cases of camera components to inform users about the required steps properly.
- Decided, based on requirements, on a proper technical approach for the task.
- Created a React web app based on the Flutter mobile application.
Technologies: Flutter, Dart, Mobile Development, Camera API, React, Redux, Firebase
Android Engineer
2024 - 2025
NOCAP Inc
- Implemented features for video editing functionality, including style customization, timeline manipulation, overlay rendering, and manipulation.
- Implemented features assuring safe roll-out with the use of feature gates for apps with over 1 million downloads.
- Cooperated with designers and other team members to implement features according to requirements.
Technologies: Android, Kotlin, Mobile Applications, Jetpack Compose, Dependency Injection, OpenGL, Protobuf
Lead Mobile Developer
2023 - 2023
Puul
- Led a team of developers and testers, ensuring the successful delivery of a working solution within the specified deadline.
- Collected detailed requirements and formulated optimal technical solutions tailored to those requirements.
- Offered constructive feedback to team members and intervened in challenging situations to ensure project continuity and team cohesion.
- Developed a Flutter application, integrating native platform code for enhanced Google Maps functionality and background location tracking.
- Assisted business team members to streamline their tasks and collaborated proactively to craft business-viable solutions.
Technologies: Mobile Development, Technical Leadership, React Native, Software Architecture, Responsive, Google Maps, Social Media APIs, iOS, Android, Rideshare Services, Flutter, NestJS, Node.js, TypeScript, Google Cloud Platform (GCP), Back-end, Firebase, Firebase Cloud Messaging (FCM), Firebase Authentication
Android Mobile Developer
2023 - 2023
Hype Labs Inc.
- Developed Native Android application with the use of Jetpack Compose.
- Designed a sustainable project structure that allows for easy project maintenance and future project development.
- Advised on the architectural design of the SDK developed alongside the mobile application.
- Integrated Web 3 wallet creation. Implemented private key storage with Android encrypted storage, secured by fingerprint.
Technologies: Mobile Development, Kotlin, Swift, Mobile Security, DevOps, Blockchain, Android, Software Design, Startups, Firebase Cloud Messaging (FCM), Jetpack Compose
Tech Lead
2022 - 2022
SKYGO Marketing
- Managed a developers' team and coordinated the development work between platforms providing requirements for their communication schema.
- Designed the architecture and developed an application for motorcycle rental. The reusability of components decreased development time, and we completed the scope two months before the deadline. That allowed us to deliver more for the client.
- Published the application on Google Play Store and managed the publishing process. Continuous delivery allowed smooth testing by QA and users.
- Took part in the discovery phase of the Toptal project. Based on the client's requirements, I decided on the proper tech stack for further development and mitigated potential risks.
Technologies: Architecture, Android, Leadership, APIs, Integration, Mobile, Java, Kotlin, Flutter, Software Architecture, Technical Leadership, Requirements Analysis, Android Jetpack, Jira, Model View ViewModel (MVVM), Android Studio, Authentication, Push Notifications, HTTP, JSON Web Tokens (JWT), Full-stack, Software Design, Startups, Back-end, Firebase Cloud Messaging (FCM), Firebase Authentication, Jetpack Compose
Android Engineer
2022 - 2022
ParaSwap
- Built an Android native application from scratch with clean architecture and an MVVM approach together with another team member.
- Integrated the app with the Web3 library. The app allows sending and receiving cryptocurrencies and swapping cryptocurrencies using a company's smart contract.
- Implemented biometric security with the use of Android native security features.
Technologies: Android, Blockchain, Cryptocurrency, Cryptocurrency Wallets, Mobile App Development, Firebase, Clean Architecture, REST, REST APIs, Unit Testing, Mobile Applications, Software Architecture, Android Jetpack, Jira, Model View ViewModel (MVVM), Android Studio, Authentication, Encryption, Push Notifications, HTTP, JSON Web Tokens (JWT), Startups, Firebase Cloud Messaging (FCM), Jetpack Compose
Android Developer
2022 - 2022
Allegro
- Oversaw the maintenance of a big corporate eCommerce application.
- Developed new features in the existing legacy codebase.
- Refactored the legacy codebase in a production-ready application.
Technologies: Android, Sentry, Jira, Architecture, Mobile, Mobile Development, APIs, Mobile Apps, Native Mobile Apps, Mobile App Development, REST, REST APIs, Unit Testing, Mobile Applications, Model View ViewModel (MVVM), Android Studio, Authentication, HTTP, JSON Web Tokens (JWT), RxJava
Lead Mobile Developer
2018 - 2021
Infotower
- Led a team of three mobile developers, managing tasks and overseeing work.
- Integrated an Android native app with Bluetooth devices and built-in hardware modules such as 2D scanners from Zebra and MioCare. Such functionality increased the productivity of pharmacy and hospital workers while doing inventory.
- Assisted in developing a Kiosk-like app that required keeping an app open for a long time without closing it.
- Provided various app versions at different development stages for testers with Firebase App Distribution. Gained an in-depth perspective on production app distribution in stores.
- Developed various libraries, focusing on efficiency with developers as end users.
- Built an application for travel agencies in Flutter.
- Developed a Flutter application with BLE communication which gathered real-time data from a spirometry device. The app allowed patients to easily take a spirometry exam and share it with their doctor from home.
Technologies: Android, Flutter, Kotlin, Dart, Architecture, Mobile, Cross-platform, Mobile Development, Google Maps API, APIs, Mobile Apps, Native Mobile Apps, Bluetooth, Bluetooth Low Energy (LE), Mobile App Development, Clean Architecture, REST, REST APIs, CI/CD Pipelines, Unit Testing, Mobile Applications, Near-field Communication (NFC), Smart Watches, Android Watch, Camera API, Software Architecture, Technical Leadership, Requirements Analysis, Android Camera App, Embedded Hardware, Android Jetpack, Leadership, Jira, Model View ViewModel (MVVM), Android Studio, Authentication, Encryption, Push Notifications, HTTP, JSON Web Tokens (JWT), SDKs, RxJava 2, RxJava, WebSockets, Software Design, GraphQL, Jetpack Compose
Android Developer
2016 - 2018
Freelance
- Developed a shooting range app with image transformation options.
- Built responsive custom widgets on Android with the usage of native Android tools.
- Collaborated with a remote and asynchronous team during app development.
Technologies: Android, Kotlin, Java, Mobile, Mobile Development, Google Maps API, APIs, Mobile Apps, Native Mobile Apps, Mobile App Development, Clean Architecture, REST, REST APIs, CI/CD Pipelines, Unit Testing, Mobile Applications, Amazon Web Services (AWS), Android Camera App, Android Studio, Authentication, HTTP, JSON Web Tokens (JWT), RxJava 2, RxJava, Google Maps
Experience
Progress Tracker App
https://gitlab.com/JakubNeukirch/progress-tracker/An open-source Android native application for progress tracking published on the F-Droid store. It implements Material Design 2.0, Android Room database, MVVM, and other good Android native app development practices.
NumberPicker Widget Library
GoodPicker is a highly extensible NumberPicker. It supports text and images by default, but items can include anything drawn on Android canvas.
I decided to recreate outdated, existing Android widgets from scratch that don't support basic customization and make them able to respond to the challenge. The library is at an early stage but showing promising results.
I decided to recreate outdated, existing Android widgets from scratch that don't support basic customization and make them able to respond to the challenge. The library is at an early stage but showing promising results.
Manufacture – Code Generation Plugin
I built a plugin that defines code templates for app development with proper architecture. This tool generates multiple defined files based on existing templates, improving efficiency without drawbacks. For now, the plugin is kept private.
DrinkBar – Clean Architecture Android Native App
https://github.com/Stonks-tech/DrinkBarA small demo app with clean architecture to showcase the use of Android Native SDK. For now, considering the primary purpose is to showcase codebase with full test coverage, the app displays a list of cocktails and shows cocktail details with instructions and ingredients. Thanks to clean architecture, I have successfully migrated the app from XML to Compose UI without significant interference in unrelated parts of the app.
LearnReader – Vocabulary Collecting App
https://join.learnreaderapp.com/An Android native project for vocabulary collection. Users can collect phrases that are automatically translated into Android. It can be used to collect vocabulary for language learning.
Tech stack: Kotlin, MVVM, XML Views, Room, Clean Architecture
Tech stack: Kotlin, MVVM, XML Views, Room, Clean Architecture
Apple TV Demo
https://github.com/Stonks-tech/AppleTVDemoWhile this is a compact demo, it effectively showcases the essentials of Apple TV app development with SwiftUI and provides a proof of concept for video playback functionality. Please note that as this is a streamlined project, it may not encompass all best practices, such as clean architecture or multi-module set up. However, it stands as a robust example for those looking to understand the basics of Apple TV applications with playback of video hosted online.
Android TV Demo
https://github.com/Stonks-tech/AndroidTVDemoWhile this is a compact demo, it effectively showcases the essentials of Android TV app development with Jetpack Compose and provides a proof of concept for video playback functionality. Please note, as this is a streamlined project, it may not encompass all best practices, such as clean architecture or multi-module setup. However, it stands as a robust example for those looking to understand the basics of Android TV applications.
Education
2017 - 2020
Bachelor's Degree in Software Engineering
University of Economics - Katowice, Poland
Skills
Libraries/APIs
REST APIs, RxJava 2, RxJava, Google Maps API, Camera API, Google Maps, Node.js, React, Google Sheets API, Social Media APIs, OpenGL, Protobuf
Tools
Android Studio, Android Jetpack, Firebase Cloud Messaging (FCM), Firebase Authentication, Slack, Sentry, Jira
Languages
Kotlin, Java, Dart, Swift, TypeScript, GraphQL
Frameworks
Android SDK, Flutter, SwiftUI, JSON Web Tokens (JWT), React Native, NestJS, Redux, Ktor
Paradigms
Cross-platform, Mobile Development, REST, Unit Testing, Clean Architecture, Low-code Development, Requirements Analysis, Model View ViewModel (MVVM), DevOps, Responsive, Dependency Injection
Platforms
Android, Firebase, Mobile, iOS, Bluetooth Low Energy (LE), Android Watch, FlutterFlow, MacOS, Blockchain, Google Cloud Platform (GCP), Amazon Web Services (AWS), Android TV, Apple TV
Storage
Compose.io
Other
Native Mobile Apps, Mobile Apps, APIs, Mobile App Development, Mobile Applications, Technical Leadership, SDKs, Jetpack Compose, Architecture, Bluetooth, CI/CD Pipelines, No-code Development, Near-field Communication (NFC), Smart Watches, Software Architecture, Android Camera App, Embedded Hardware, Authentication, Push Notifications, HTTP, WebSockets, Full-stack, Startups, Axios, Discord, Back-end, Cryptocurrency, Cryptocurrency Wallets, IntelliJ SDK, Plugins, Leadership, Integration, Encryption, Room, Mobile Security, Software Design, Rideshare Services
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