Jan is available for hire
Hire JanJan Wisniewski
Verified Expert in Engineering
Expert Mobile Developer
Rzeszow, Poland
Toptal member since February 6, 2025
Bio
Jan is a seasoned software engineer with 18 years of experience in the software industry. He has seven years of professional experience as a full-stack developer and 11 years in mobile development. Jan has a proven track record in leading development teams and delivering high-quality applications across various industries.
Portfolio
Inkitt Inc
React Native, Expo, TypeScript, React, NestJS, Node.js, Next.js, Tailwind CSS...
Toptal
iOS, Swift, SwiftUI, GraphQL, App Design, SQL, Responsive UI...
Santander Bank Polska
Swift, UIKit, SwiftUI, Combine, App Design, Responsive UI...
Experience
- Xcode - 16 years
- iOS - 14 years
- UIKit - 10 years
- Swift - 6 years
- Combine - 4 years
- SwiftUI - 4 years
- React Native - 4 years
- React - 4 years
Work Experience
Full-stack Mobile Engineer
2026 - 2026
Inkitt Inc
- Architected and developed flexible paywall systems.
- Tracked and fixed bugs in all of the projects, mobile, web, and back end.
- Developed new UI and UI updates for the client's main applications.
Technologies: React Native, Expo, TypeScript, React, NestJS, Node.js, Next.js, Tailwind CSS, App Design, HTML5, Stripe, SQL, Claude, Jest, Responsive UI, Application State Management, Large Language Models (LLMs), AI Integration, LLM Integration, Speech-to-Text (STT), iPhone, Bug Fixes, Claude Code, Data Extraction, Manual QA, Planning, Software Testing, IT Audits, Flutter, iPad, Agentic Coding, Supabase, Prisma, Cursor AI, Debugging, Performance, Third-party APIs, Auditing, CRM, Core Web Vitals, SEO Tools, Search Engine Optimization (SEO), eCommerce, Analytics, Advertising Technology (Adtech), Native Mobile Apps, Algorithms, Payment Processing, Google Play Store, Front-end Development, System Architecture, Authentication, Email Authentication, User Authentication, iOS Authentication, ChatGPT, Codex, AI Tools, LLDB, AI Development, Videos, Replit, Cloud Storage, Web Development, Google Play API, System Design, Go, Mobile Architecture, Linear, REST, GoLand, Platform Engineering, Claude API, ChatGPT API, AI Workflow, AI Consulting, Dependency Injection, Observability, Testing, Modularization, Macros
Swift/SwiftUI Developer
2025 - 2025
Toptal
- Developed a large language model (LLM) agent integration into core app functionalities.
- Built new functionalities, speeding user workflows by up to 90%.
- Migrated UIKit/RxSwift codebase to SwiftUI and Combine.
Technologies: iOS, Swift, SwiftUI, GraphQL, App Design, SQL, Responsive UI, Application State Management, Large Language Models (LLMs), AI Integration, LLM Integration, Speech-to-Text (STT), Text-to-Speech (TTS), Core ML, iPhone, Bug Fixes, Claude Code, Data Extraction, Manual QA, Planning, Software Testing, IT Audits, Product Ownership, iPad, Agentic Coding, Cursor AI, Debugging, Performance, Third-party APIs, Auditing, CRM, Audits, Analytics, Native Mobile Apps, Algorithms, Payment Processing, Google Play Store, Authentication, Email Authentication, User Authentication, iOS Authentication, ChatGPT, AI Tools, LLDB, AI Development, Replit, Calendars, System Design, Mobile Architecture, XCTest, Claude API, ChatGPT API, AI Workflow, AI Consulting, Dependency Injection, Observability, Testing, Modularization, Macros, Charting
Senior Software Engineer
2023 - 2024
Santander Bank Polska
- Extended critical features in the application core with impact across multiple countries.
- Updated UI with new versions of core reusable components.
- Developed new account transfer flows resulting in 20% faster overall process.
Technologies: Swift, UIKit, SwiftUI, Combine, App Design, Responsive UI, Application State Management, Speech-to-Text (STT), Text-to-Speech (TTS), iPhone, Bug Fixes, Manual QA, Planning, Software Testing, IT Audits, Product Ownership, Debugging, Performance, Third-party APIs, Auditing, CRM, Audits, Analytics, Native Mobile Apps, Algorithms, Payment Processing, Google Play Store, Authentication, Email Authentication, User Authentication, iOS Authentication, Mobile Device Management (MDM), iOS Mobile Device Management (MDM), LLDB, Lending, Calendars, System Design, Mobile Architecture, REST, XCTest, Dependency Injection, Observability, Testing, Modularization, Macros, Charting
Senior Software Engineer
2021 - 2023
Asseco Data Systems
- Delivered two public transport telematics apps for metropolitan areas with a target user base of seven million users.
- Developed full lifecycle, iOS front-end systems and provided platform expertise.
- Helped with the design of the main features within the iOS app.
Technologies: Swift, SwiftUI, Combine, React, React Native, JavaScript, TypeScript, iOS, MacOS, Xcode, User Interface (UI), User Experience (UX), Prototyping, iOS SDK, Android, Architecture, Mobile Development, Decentralized Systems, Networking, Kotlin, Software Development, JSON, REST APIs, APIs, Apple Watch, Mobile Apps, Core Data, Core Bluetooth, Near-field Communication (NFC), Front-end, Agile Software Development, CI/CD Pipelines, Data Structures, Mobile App Development, Database Architecture, Cloud, Firebase, Online Payments, Consumer-facing Products, App Store, Bluetooth, OAuth, Mobile, Apps, Coding, Software, iOS Native Libraries, IoT Security, Bluetooth Low Energy (LE), App Store Acceptance Process, RESTFul APIs, API Integration, SMS, GraphQL, Security, Expo, Real-time Data, Real-time Systems, Figma, Microservices, Data Visualization, Model View ViewModel (MVVM), Async/Await, Asynchronous Programming, GitHub, Subscriptions, Growth, VPN, GitLab CI/CD, Redux, Mapbox, Tailwind CSS, Concurrency, Asynchronous Data Streams, Git, Push Notifications, Optimization, Apple Human Interface, UX Design, Design Systems, Design Thinking, Internet of Things (IoT), Core NFC, Fastlane, Passwordless Authentication, Code Review, WebView, WidgetKit, Quality Assurance (QA), Communication, Bluetooth Low Energy (BLE), Google APIs, Biometrics, Fintech, GraphQL API, Automated Testing, Model View Presenter (MVP), App Development, SDKs, Location Services, Maps, Payment APIs, Clean Architecture, AI-assisted Development, Code Refactoring, Performance Optimization, System Integration, Apple HealthKit, WatchOS, Core Motion, Tracking, Code Auditing, Progressive Web Applications (PWAs), HIPAA Compliance, General Data Protection Regulation (GDPR), HIPAA, Software Development Toolkits (SDK), iOS App Development, Scalability, IT Security, Geolocation, Cross-platform, Real-time Tracking, Artificial Intelligence (AI), Cross-platform App Development, App Design, SQL, Android Development, Responsive UI, Application State Management, Speech-to-Text (STT), Text-to-Speech (TTS), Core ML, iPhone, Bug Fixes, Data Extraction, Manual QA, Planning, Software Testing, IT Audits, Product Ownership, Logistics, Debugging, Performance, Third-party APIs, CRM, eCommerce, Analytics, Native Mobile Apps, Algorithms, Geofencing, Payment Processing, Google Maps API, Google Play Store, System Architecture, Authentication, Email Authentication, User Authentication, iOS Authentication, Mobile Device Management (MDM), iOS Mobile Device Management (MDM), LLDB, Healthtech, Calendars, Google Play API, Firebase Cloud Messaging (FCM), Service-oriented Architecture (SOA), System Design, Mobile Architecture, REST, XCTest, Modeling, Platform Engineering, Data Engineering, Dependency Injection, Observability, Testing, Modularization, Charting
Team Lead and Senior Software Developer
2021 - 2021
Bank Millennium
- Led a team to deliver the Junior app, a version of the bank's main user app.
- Delivered a version of the app for young clients below the age of 13, with over 100,000 downloads in the first few weeks.
- Provided technical leadership and expertise to junior team members.
Technologies: Swift, UIKit, User Interface (UI), User Experience (UX), iOS SDK, Architecture, Leadership, Mobile Development, Decentralized Systems, Networking, Software Development, JSON, REST APIs, APIs, Apple Watch, Mobile Apps, Core Data, Near-field Communication (NFC), Front-end, Agile Software Development, CI/CD Pipelines, Data Structures, Mobile App Development, Technical Leadership, Database Architecture, Cloud, Firebase, MacOS, Online Payments, Consumer-facing Products, App Store, OAuth, Mobile, Apps, Coding, Software, iOS Native Libraries, RESTFul APIs, API Integration, SMS, GraphQL, Security, Figma, Model View ViewModel (MVVM), Asynchronous Programming, GitHub, A/B Testing, Subscriptions, VPN, Exchanges, Concurrency, Asynchronous Data Streams, Git, Push Notifications, Apple Human Interface, Passwordless Authentication, Code Review, WebView, Quality Assurance (QA), Communication, Google APIs, Biometrics, Fintech, Automated Testing, Model View Presenter (MVP), App Development, SDKs, Payment APIs, Clean Architecture, Code Refactoring, Performance Optimization, System Integration, Code Auditing, General Data Protection Regulation (GDPR), Software Development Toolkits (SDK), iOS App Development, Scalability, IT Security, Cross-platform App Development, Responsive UI, Application State Management, Speech-to-Text (STT), Text-to-Speech (TTS), iPhone, Bug Fixes, Manual QA, Planning, Software Testing, IT Audits, Product Ownership, Debugging, Performance, Third-party APIs, Audits, Analytics, Native Mobile Apps, Algorithms, Payment Processing, Google Play Store, System Architecture, Authentication, Email Authentication, User Authentication, iOS Authentication, Mobile Device Management (MDM), iOS Mobile Device Management (MDM), LLDB, Lending, Calendars, Service-oriented Architecture (SOA), System Design, Mobile Architecture, REST, XCTest, Modeling, Dependency Injection, Observability, Testing, Modularization
Lead Senior Developer
2019 - 2020
Comarch
- Managed full mobile stack development of the Spring Boot and WildFly back end and the iOS front end.
- Developed major raw data collection and analysis modules with a presentation of readable statistics.
- Wrote services that provided data collected from devices for a comprehensive presentation in the user feed.
- Supported and extended the functionality of apps for semiconductor producers using Bluetooth for connection and control.
Technologies: Swift, Objective-C, UIKit, Java, Spring Boot, React, React Native, JavaScript, TypeScript, Xcode, iOS, WildFly, Prototyping, User Interface (UI), User Experience (UX), iOS SDK, Android, Architecture, Leadership, Mobile Development, Decentralized Systems, Networking, Kotlin, Full-stack, Software Development, JSON, REST APIs, APIs, Amazon Web Services (AWS), Apple Watch, Mobile Apps, Core Data, Core Bluetooth, UI Design, Front-end, Agile Software Development, CI/CD Pipelines, Data Structures, Mobile App Development, Technical Leadership, Web Architecture, Database Architecture, Cloud Infrastructure, Cloud, MongoDB, Firebase, TestFlight, MacOS, Online Payments, RxSwift, Consumer-facing Products, In-app Purchase (IAP), App Store, WebSockets, AVFoundation, Bluetooth, Back-end, OAuth, Identity & Access Management (IAM), Mobile, Apps, Coding, Software, Embedded C++, C++, 3D CAD, iOS Native Libraries, Embedded Systems, IoT Security, Embedded C, Bluetooth Low Energy (LE), App Store Acceptance Process, RESTFul APIs, App Store Optimization (ASO), Full-stack Development, Software Architecture, Early-stage Startups, Messaging, Minimum Viable Product (MVP), API Integration, SMS, DevOps, Security, Node.js, NestJS, Real-time Data, Real-time Systems, Wearable Technology, Wearables, CSS, HTML, Figma, Streaming, Microservices, Docker, Kubernetes, Data Visualization, Model View ViewModel (MVVM), Asynchronous Programming, GitHub, Subscriptions, Growth, VPN, Heroku, Redux, Canvas, SVG, Concurrency, Data Modeling, Asynchronous Data Streams, Audio Processing, Git, Push Notifications, Optimization, Apple Human Interface, UX Design, Design Systems, Design Thinking, Realm, Internet of Things (IoT), Firmware, Charts, Core NFC, Passwordless Authentication, Health, Code Review, Quality Assurance (QA), Communication, BLE Audio, Bluetooth Low Energy (BLE), Biometrics, Automated Testing, Model View Presenter (MVP), App Development, Speech Recognition, Voice Recognition, SDKs, Location Services, Maps, Payment APIs, Clean Architecture, Code Refactoring, Performance Optimization, System Integration, WatchOS, Core Motion, Tracking, Mobile UI Design, Wireless Protocols, Bitbucket, Code Auditing, Progressive Web Applications (PWAs), HIPAA Compliance, HIPAA, Software Development Toolkits (SDK), iOS App Development, Hardware, Scalability, IT Security, Geolocation, Cross-platform, Real-time Tracking, Cross-platform App Development, HTML5, SQL, Android Development, Next.js, Responsive UI, Application State Management, Text-to-Speech (TTS), Core ML, iPhone, Bug Fixes, Data Extraction, Manual QA, Planning, Software Testing, IT Audits, Product Ownership, Debugging, MongoDB Atlas, Performance, Third-party APIs, Auditing, CRM, eCommerce, Analytics, Native Mobile Apps, Algorithms, Geofencing, Payment Processing, Pub/Sub, Google Maps API, Google Play Store, Message Queues, Front-end Development, Healthcare Software, System Architecture, SMART on FHIR, Authentication, Email Authentication, SQLite, User Authentication, iOS Authentication, Cloudflare, LLDB, Videos, Cloud Storage, Web Development, Calendars, Google Play API, Firebase Cloud Messaging (FCM), System Design, Mobile Architecture, AVPlayer, REST, XCTest, AirPlay, Modeling, AI Modeling, Supply Chain, Platform Engineering, Data Engineering, Dependency Injection, Observability, Testing, Modularization, Charting
Senior Engineer
2015 - 2018
Mobica
- Developed apps for major telecommunication companies with multimillion daily usage.
- Built apps in various industries, including semiconductors, media streaming, and aviation.
- Mentored junior developers and conducted technical interviews.
- Developed apps for the biggest semiconductor producers using Bluetooth for connection and control.
Technologies: Swift, Objective-C, UIKit, Java, Spring Boot, React, React Native, JavaScript, TypeScript, Prototyping, User Interface (UI), User Experience (UX), iOS SDK, Android, Architecture, Leadership, Mobile Development, Decentralized Systems, Networking, Kotlin, Full-stack, Software Development, JSON, REST APIs, Python, APIs, Amazon Web Services (AWS), Apple Watch, Mobile Apps, Core Data, Core Bluetooth, UI Design, Front-end, Agile Software Development, CI/CD Pipelines, Data Structures, Mobile App Development, Technical Leadership, Web Architecture, Database Architecture, Cloud Infrastructure, Cloud, MongoDB, Firebase, TestFlight, MacOS, Online Payments, RxSwift, Consumer-facing Products, In-app Purchase (IAP), App Store, WebSockets, AVFoundation, AppKit, Bluetooth, Back-end, OAuth, Identity & Access Management (IAM), PostgreSQL, Mobile, Apps, Coding, Software, Embedded C++, C++, 3D CAD, iOS Native Libraries, Embedded Systems, IoT Security, Embedded C, Bluetooth Low Energy (LE), App Store Acceptance Process, RESTFul APIs, App Store Optimization (ASO), Full-stack Development, Software Architecture, Early-stage Startups, Messaging, Minimum Viable Product (MVP), API Integration, SMS, DevOps, Security, Node.js, Real-time Data, Real-time Systems, Wearable Technology, Wearables, CSS, HTML, Social Networks, Streaming, Microservices, Docker, Kubernetes, Data Visualization, Model View ViewModel (MVVM), Asynchronous Programming, GitHub, A/B Testing, Subscriptions, Growth, VPN, MySQL, Heroku, Exchanges, WebRTC, Over-the-top Content (OTT), VoIP, Concurrency, Data Modeling, Asynchronous Data Streams, Audio Processing, Audio Streaming, Real-time Audio Processing, Git, Push Notifications, Optimization, Apple Human Interface, UX Design, Design Systems, Design Thinking, Realm, Internet of Things (IoT), Charts, Health, Code Review, Quality Assurance (QA), Communication, BLE Audio, Bluetooth Low Energy (BLE), Fintech, Automated Testing, Model View Presenter (MVP), Offline-first Development, App Development, ARKit, TrueDepth Camera, SDKs, Location Services, Maps, Payment APIs, Clean Architecture, Code Refactoring, Performance Optimization, Core Motion, Tracking, Mobile UI Design, Wireless Protocols, Aviation, Bitbucket, Code Auditing, Software Development Toolkits (SDK), iOS App Development, Video Streaming, IT Security, Geolocation, Real-time Tracking, SQL, Android Development, Responsive UI, Application State Management, Speech-to-Text (STT), Text-to-Speech (TTS), iPhone, Bug Fixes, Data Extraction, Manual QA, Planning, Software Testing, IT Audits, iPad, Shipping, Debugging, MongoDB Atlas, Performance, Third-party APIs, Auditing, CMS, CRM, Audits, Twilio API, eCommerce, Analytics, Advertising Technology (Adtech), .NET, C#, C#.NET, Azure, Native Mobile Apps, Algorithms, Geofencing, Payment Processing, Pub/Sub, Google Maps API, Google Play Store, Message Queues, Front-end Development, Ruby on Rails (RoR), Healthcare Software, System Architecture, Authentication, Email Authentication, SQLite, User Authentication, iOS Authentication, LLDB, Videos, Cloud Storage, Web Development, Lending, Healthtech, Calendars, Google Calendar API, Google Play API, Firebase Cloud Messaging (FCM), System Design, Mobile Architecture, AVPlayer, HTTP Live Streaming (HLS), REST, XCTest, AirPlay, Modeling, Supply Chain, Platform Engineering, Data Engineering, Dependency Injection, Observability, Testing, Modularization
Lead iOS Developer
2013 - 2014
Norbelle LLC
- Developed and helped with the design of the main product's iOS app.
- Managed the entire development lifecycle of the iOS app, from specification to App Store release.
- Designed the architecture, published it on iTunesConnect, and provided technical expertise.
Technologies: Objective-C, UIKit, Prototyping, iOS SDK, Android, Architecture, Leadership, Mobile Development, Decentralized Systems, Networking, Full-stack, Software Development, REST APIs, APIs, Amazon Web Services (AWS), Mobile Apps, Core Data, Core Bluetooth, UI Design, Front-end, Agile Software Development, Data Structures, Mobile App Development, Technical Leadership, Database Architecture, Cloud, Online Payments, Consumer-facing Products, StoreKit, In-app Purchase (IAP), App Store, WebSockets, AVFoundation, AppKit, Bluetooth, Back-end, Identity & Access Management (IAM), Mobile, Apps, Coding, Software, iOS Native Libraries, IoT Security, App Store Acceptance Process, RESTFul APIs, App Store Optimization (ASO), Full-stack Development, Software Architecture, Early-stage Startups, Messaging, Minimum Viable Product (MVP), API Integration, DevOps, Security, Real-time Data, Real-time Systems, Wearable Technology, Wearables, Social Networks, Streaming, Microservices, Model View ViewModel (MVVM), Asynchronous Programming, GitHub, Growth, VPN, Heroku, VoIP, Concurrency, Data Modeling, Asynchronous Data Streams, Audio Processing, Audio Streaming, Real-time Audio Processing, Git, Push Notifications, Optimization, Apple Human Interface, UX Design, Design Systems, Design Thinking, Internet of Things (IoT), Firmware, Code Review, Quality Assurance (QA), Communication, Bluetooth Low Energy (BLE), Automated Testing, App Development, SDKs, Location Services, Maps, Clean Architecture, Code Refactoring, Performance Optimization, Core Motion, Tracking, Mobile UI Design, Wireless Protocols, Code Auditing, iOS App Development, Hardware, Video Streaming, Geolocation, Real-time Tracking, Responsive UI, Application State Management, iPhone, Bug Fixes, Data Extraction, Manual QA, Planning, Software Testing, IT Audits, Product Ownership, Debugging, Performance, Third-party APIs, Audits, Analytics, Native Mobile Apps, Algorithms, Geofencing, Payment Processing, Pub/Sub, Google Maps API, Google Play Store, Message Queues, Front-end Development, Ruby on Rails (RoR), System Architecture, Authentication, Email Authentication, SQLite, User Authentication, iOS Authentication, Cloud Storage, Firebase Cloud Messaging (FCM), System Design, Mobile Architecture, REST, XCTest, Modeling, Platform Engineering, Data Engineering, Dependency Injection, Observability, Testing, Modularization
Team Lead
2011 - 2013
Applico
- Designed the architecture and developed mobile apps for various industries.
- Provided technical leadership and expertise to designers, managers, and junior team members.
- Leveraged multi-platform technologies, from a Java back end to an iOS and Android front end.
Technologies: iOS, UIKit, Objective-C, Java, Spring Boot, Openfire, Xcode, Prototyping, iOS SDK, Android, Architecture, Leadership, Mobile Development, Decentralized Systems, Networking, Full-stack, Software Development, REST APIs, APIs, Mobile Apps, Core Data, Core Bluetooth, Front-end, Agile Software Development, Data Structures, Mobile App Development, Technical Leadership, Database Architecture, Cloud, Online Payments, Consumer-facing Products, StoreKit, App Store, WebSockets, AVFoundation, Back-end, Identity & Access Management (IAM), PostgreSQL, Mobile, Apps, Coding, Software, 3D CAD, iOS Native Libraries, IoT Security, App Store Acceptance Process, RESTFul APIs, App Store Optimization (ASO), Software Architecture, Early-stage Startups, Messaging, Minimum Viable Product (MVP), API Integration, Security, Real-time Data, Real-time Systems, Wearable Technology, Wearables, HTML, Social Networks, Streaming, Microservices, Model View ViewModel (MVVM), Asynchronous Programming, GitHub, Growth, VPN, Heroku, WebRTC, Over-the-top Content (OTT), Concurrency, Data Modeling, Asynchronous Data Streams, Audio Processing, Audio Streaming, Real-time Audio Processing, Git, Push Notifications, Optimization, Apple Human Interface, UX Design, Design Systems, Design Thinking, Firmware, Health, Code Review, Communication, Automated Testing, Offline-first Development, App Development, Facial Tracking, SDKs, Location Services, Maps, Clean Architecture, Code Refactoring, Performance Optimization, Core Motion, Tracking, Mobile UI Design, UI Design, Wireless Protocols, Code Auditing, iOS App Development, Hardware, Video Streaming, Geolocation, Real-time Tracking, Artificial Intelligence (AI), Android Development, Responsive UI, Application State Management, iPhone, Bug Fixes, Data Extraction, Manual QA, Planning, Software Testing, IT Audits, iPad, Shipping, Debugging, Performance, Third-party APIs, Auditing, Audits, Twilio API, Analytics, Advertising Technology (Adtech), Native Mobile Apps, Algorithms, Geofencing, Payment Processing, Google Maps API, Google Play Store, Message Queues, Ruby on Rails (RoR), Healthcare Software, System Architecture, SMART on FHIR, Authentication, Email Authentication, User Authentication, iOS Authentication, Videos, Cloud Storage, Healthtech, Calendars, Firebase Cloud Messaging (FCM), System Design, Mobile Architecture, AVPlayer, HTTP Live Streaming (HLS), REST, XCTest, Modeling, Supply Chain, Platform Engineering, Data Engineering, Dependency Injection, Observability, Testing, Modularization
Project History
Bank Millennium App
https://apps.apple.com/us/app/bank-millennium/id412646128This is a customer-facing app that provides all the functionalities that the bank offers. My team implemented the main functionality, a full app version for children under 13. It was written in Swift and UIKit.
Cearch
Cearch is a GPS-based location technology that helps you find people and places from your phone. The app provides an arrow that points to the person or object of interest, which is useful, especially outside of an established road or path grid.
CareMate
https://apps.apple.com/us/app/comarch-caremate/id1450787539CareMate is a mobile application that constitutes a part of a comprehensive care service offered by Comarch. The application, combined with an integrated Comarch WristBand monitoring device (available as a wristband or key ring), constitutes a modern remote care service dedicated to elderly and chronically ill people who need constant monitoring and support in care.
Transport GZM
https://apps.apple.com/pl/app/transport-gzm/id1658522203Transport GZM is a free mobile application that helps you travel across 56 municipalities of Upper Silesia and the Dąbrowa Basin. The application allows you to plan and pay for your journey.
The application was created by the Upper Silesian-Zagłębie Metropolis, one of Poland's largest organizers of public transport.
The application was created by the Upper Silesian-Zagłębie Metropolis, one of Poland's largest organizers of public transport.
System FALA
https://apps.apple.com/ph/app/system-fala/id1625883975The System FALA application is one of the tools of the FALA System, enabling convenient and quick purchase of SKM and POLREGIO train tickets in the entire Pomeranian Voivodeship (includes tickets from the Pomeranian Tariff) and tickets for public transport in the Tri-City.
Education
2020 - 2023
Bachelor's Degree in Computer Science
Polish-Japanese Academy of Information Technology - Warsaw, Poland
2004 - 2006
Master's Degree in Computer Science
Warsaw University of Technology - Warsaw, Poland
Skills
Libraries/APIs
React, REST APIs, iOS Native Libraries, RxSwift, Node.js, WebRTC, GraphQL API, Stripe, Google Maps API, Claude API, Google APIs, Twilio API, Google Calendar API, Google Play API
Tools
Xcode, TestFlight, Expo, GitHub, Git, WebView, Apple HealthKit, Bitbucket, Claude, Claude Code, ChatGPT, Codex, LLDB, Figma, VPN, GitLab CI/CD, Canvas, Fastlane, Prisma, MongoDB Atlas, Firebase Cloud Messaging (FCM), AVPlayer, WildFly, RabbitMQ, SMART on FHIR, GoLand
Languages
Swift, TypeScript, JavaScript, Objective-C, GraphQL, CSS, Java, Kotlin, Python, Embedded C++, C++, Embedded C, HTML, HTML5, SQL, Go, C#, C#.NET
Frameworks
UIKit, SwiftUI, Combine, React Native, iOS SDK, Core Data, Core Bluetooth, WidgetKit, Core Motion, Next.js, XCTest, Spring Boot, StoreKit, AppKit, NestJS, Redux, Tailwind CSS, ARKit, Jest, Core ML, Flutter, .NET, Ruby on Rails (RoR)
Paradigms
Mobile Development, Agile Software Development, App Store Optimization (ASO), Real-time Systems, Microservices, Model View ViewModel (MVVM), Asynchronous Programming, App Development, Clean Architecture, Mobile UI Design, Software Testing, REST, Dependency Injection, Testing, Modularization, UI Design, Web Architecture, DevOps, UX Design, Design Thinking, Automated Testing, Model View Presenter (MVP), Offline-first Development, Code Refactoring, HIPAA Compliance, Cross-platform, Search Engine Optimization (SEO), Service-oriented Architecture (SOA)
Platforms
iOS, Android, MacOS, Firebase, Mobile, Bluetooth Low Energy (LE), WatchOS, Amazon Web Services (AWS), Apple Watch, Docker, Kubernetes, Heroku, Mapbox, Azure, Replit
Storage
JSON, Database Architecture, MongoDB, PostgreSQL, MySQL, Realm, SQLite
Other
Software Development, Computer Science, Prototyping, User Interface (UI), User Experience (UX), Architecture, Leadership, Decentralized Systems, Networking, Full-stack, APIs, Mobile Apps, Front-end, Data Structures, Mobile App Development, Technical Leadership, Online Payments, Consumer-facing Products, WebSockets, Bluetooth, Back-end, Apps, Coding, Robotics, Software, App Store Acceptance Process, RESTFul APIs, Full-stack Development, Software Architecture, Early-stage Startups, Messaging, Minimum Viable Product (MVP), API Integration, SMS, Security, Real-time Data, Wearable Technology, Wearables, Social Networks, Streaming, Data Visualization, Async/Await, Concurrency, Push Notifications, Internet of Things (IoT), Code Review, Quality Assurance (QA), Communication, Location Services, Maps, Tracking, Code Auditing, Software Development Toolkits (SDK), iOS App Development, Geolocation, Real-time Tracking, Cross-platform App Development, App Design, Responsive UI, Application State Management, AI Integration, LLM Integration, Speech-to-Text (STT), Text-to-Speech (TTS), iPhone, Bug Fixes, Data Extraction, Manual QA, Planning, IT Audits, Product Ownership, iPad, Agentic Coding, Cursor AI, Debugging, Performance, Third-party APIs, Audits, eCommerce, Analytics, Native Mobile Apps, Algorithms, Geofencing, Payment Processing, Front-end Development, Authentication, Email Authentication, User Authentication, iOS Authentication, AI Tools, AI Development, Videos, Linear, Observability, Near-field Communication (NFC), CI/CD Pipelines, Cloud Infrastructure, Cloud, In-app Purchase (IAP), App Store, OAuth, Identity & Access Management (IAM), Embedded Systems, IoT Security, A/B Testing, Subscriptions, Growth, Exchanges, Over-the-top Content (OTT), VoIP, Data Modeling, Asynchronous Data Streams, Optimization, Apple Human Interface, Design Systems, Firmware, Charts, Core NFC, Passwordless Authentication, Health, Bluetooth Low Energy (BLE), Biometrics, Fintech, Facial Tracking, Speech Recognition, SDKs, Payment APIs, AI-assisted Development, Performance Optimization, System Integration, Wireless Protocols, Aviation, Signal Processing, Progressive Web Applications (PWAs), General Data Protection Regulation (GDPR), HIPAA, Hardware, Video Streaming, Scalability, IT Security, Artificial Intelligence (AI), Android Development, Large Language Models (LLMs), Supabase, Logistics, Shipping, Auditing, CMS, CRM, Core Web Vitals, SEO Tools, Advertising Technology (Adtech), Pub/Sub, Google Play Store, Message Queues, Healthcare Software, System Architecture, Cloudflare, Mobile Device Management (MDM), iOS Mobile Device Management (MDM), Cloud Storage, Web Development, Lending, Healthtech, Calendars, System Design, Mobile Architecture, HTTP Live Streaming (HLS), AirPlay, Modeling, AI Modeling, Supply Chain, Platform Engineering, Data Engineering, ChatGPT API, AI Workflow, AI Consulting, Macros, Charting, Openfire, AVFoundation, 3D CAD, SVG, Audio Processing, Audio Streaming, Real-time Audio Processing, BLE Audio, TrueDepth Camera, Voice Recognition
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