Matthias Zarzecki - Senior iOS & Flutter Developer

Q: Where is Matthias based?

Matthias is based in Berlin, Germany and can operate in on-site , hybrid , and remote work models.

Q: What languages does Matthias speak?

Matthias speaks the following languages: German (Native), English (Native), Spanish (Elementary), French (Elementary), Italian (Elementary), Dutch (Elementary), Polish (Elementary) .

Q: How many years of experience does Matthias have?

Matthias has at least 9 years of experience. During this time, Matthias has worked in at least 9 different roles and for 16 different companies . The average length of individual experience is 1 year and 7 months . Note that Matthias may not have shared all experience and actually has more experience.

Q: What is Matthias's latest experience?

Matthias's most recent position is Senior Flutter Developer at Materna .

Q: What companies has Matthias worked for in recent years?

In recent years, Matthias has worked for Materna , VDQ Business Solutions , Immunifriend , Allianz Versicherungen , and Calima Safety .

Q: Which industries is Matthias most experienced in?

Matthias is most experienced in industries like Information Technology , Food and Beverage , and Professional Services . Matthias also has some experience in Automotive , Telecommunication , and Insurance .

Q: Which business areas is Matthias most experienced in?

Matthias is most experienced in business areas like Information Technology , Product Development , and Quality Assurance . Matthias also has some experience in Research and Development .

Q: Which industries has Matthias worked in recently?

Matthias has recently worked in industries like Information Technology , Automotive , and Telecommunication .

Q: Which business areas has Matthias worked in recently?

Matthias has recently worked in business areas like Information Technology and Product Development .

Recommended expert

Berlin, Germany

Check rate

Experience

Mar 2026 - Present

5 months

Düsseldorf, Germany

Hybrid

Senior Flutter Developer

Materna

Developed a Flutter app for eID ID card logins
Focus: Flutter, iOS, eID, AusweisAppSDK, Mason, Keycloak, Agentic Coding, Arc42, Jenkins

Aug 2025 - Nov 2025

4 months

Giessen, Germany

Remote

Lead Flutter Developer

VDQ Business Solutions

Developed an app for construction site safety
Focus: iOS, Flutter, Dart, Riverpod, Bloc, Copilot, Agentic Coding, Claude

Jul 2025 - Present

1 year 1 month

Remote

Flutter Consultant

Immunifriend

Consulted and mentored for a group video call app
Focus: iOS, Flutter, Dart, Riverpod, Bloc, Jitsi, Agentic Coding

Dec 2024 - Aug 2025

9 months

Munich, Germany

Hybrid

Senior iOS Developer

Allianz Versicherungen

Developed the Allianz health app
Focus: iOS, Jenkins, A11Y, SonarQube, Fastlane, Quick, Nimble, ViewInspector, XCUI

Sep 2024 - Mar 2025

7 months

Berlin, Germany

Hybrid

Lead Apple Watch & iOS Developer

Calima Safety

Developed an Apple Watch app for workplace safety
Focus: iOS, WatchOS, WatchKit, Falling Down API, Sentry, Bluetooth, IoT

Sep 2024 - Dec 2024

4 months

Essen, Germany

Hybrid

Senior iOS Developer

Bitmarck

Developed the Bitmarck whitelabel app for 30 health insurance companies
Focus: iOS, Jenkins, AppCenter, Firebase, A11Y, NFC, CryptoKit, ProtoBuf, SonarQube

Sep 2024 - Oct 2024

2 months

Düsseldorf, Germany

Remote

Lead Apple Vision Pro Developer

ShapedAgency

Developed an augmented reality app for the Apple Vision Pro
Focus: iOS, visionOS, RealityKit

Jul 2024 - Sep 2024

3 months

Potsdam, Germany

On-site

Senior Flutter Developer

MicroMovieMedia GmbH

Developed the QR code scanner
Developed an audio streaming solution
Focus: Flutter, Dart, GoRouter, QR code scanning

Apr 2024 - May 2024

2 months

London, United Kingdom

Remote

Lead Apple Vision Pro Developer

Unit9

Native iOS lead for several Unity developers on a virtual reality app for the Apple Vision Pro
Focus: visionOS, Apple Vision Pro, RealityKit

Sep 2023 - Apr 2024

8 months

Stuttgart, Germany

Hybrid

Senior iOS Developer

STIHL

Developed the Stihl Connected Bluetooth app
Focus: CoreBluetooth, IoT, Combine, UIKit, MS App Center, Github Actions, Azure DevOps, SwiftUI, SonarQube

Jul 2023 - Sep 2023

3 months

Senior iOS Developer

KptnCook

Worked on an update to database technology
Worked on the transition from UIKit to SwiftUI
Was featured in the Apple App Store
Focus: UIKit & SwiftUI architecture transition, widgets, Realm

May 2022 - Feb 2023

10 months

Senior iOS Developer

Chrono24

Developed the Chrono24 app
Worked on the Augmented Reality watch scanner
Focus: DIKit, datasource & repository architecture, UIKit & SwiftUI architecture transition, modularization, async/await, Apple Watch, HealthKit

Jun 2021 - Aug 2022

1 year 3 months

Senior iOS Developer

OneCode (aka Red Android)

Developed an internal fleet management app for Telekom
Increased the number of unit tests significantly
Developed the Bosch Flow electric bike app
Integrated Apple Health into the Bosch Flow electric bike app
Developed the Apple Watch integration
Developed MapBox features
Worked in a SAFe structure with 11 other Scrum teams
Built the CICD infrastructure for iOS and Android from scratch for the Unu Motors eMoped app
Focus: SwiftUI, Combine, Fastlane, Bitrise, MapBox, Apple HealthKit, Apple WatchKit, Visual Studio App Center, Lottie animations, XCUI

Jun 2020 - Sep 2020

4 months

Berlin, Germany

Hybrid

Virtual Reality & Unity Developer

Neomento & Charité Berlin

Developed the Neomento Virtual Therapy System. Focus: Unity, Virtual Reality, Vuforia, HTC Vive, C#

Jun 2019 - May 2021

2 years

Berlin, Germany

On-site

Senior iOS & Flutter Developer

Oetker Digital & All About Cake

Developed the Backen.de app
Developed the Juit app in Flutter, with Bluetooth functionality
Reduced deployment and build times by 90%, codebase size by 73%
Was featured in the Apple App Store
Developed the CICD system via Bitrise
Focus: Swift, SwiftUI, Combine, Fastlane, Bitrise, Firebase, Realm, Bluetooth, Flutter, IoT, A11Y

Apr 2017 - May 2019

2 years 2 months

Berlin, Germany

On-site

iOS & DevOps Developer

IBM iX

Developed several iOS apps with Swift, CoreML & MapBox
Developed the CI/CD system for dozens of apps with Jenkins, Fastlane & SonarQube
Developed a UI testing solution for multiple projects
Created an augmented reality app with Unity & Vuforia
Focus: Jenkins, Fastlane, MapBox, Vuforia, CoreML, SonarQube, Flutter, Dart, XCUI

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Food and Beverage, Professional Services, Insurance, Retail, and Automotive.

Information Technology

Food and Beverage

Professional Services

Insurance

Retail

Automotive

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, Quality Assurance, and Research and Development.

Information Technology

Product Development

Quality Assurance

Research and Development

Summary

12+ years of experience, 30+ projects developed, 6 VR/XR projects
Worked for: IBM, Dr. Oetker, Volkswagen, Telekom, Techniker Krankenkasse
Award-winning, Mobile CI/CD expert, Fastlane open source contributor
Active in the iOS developer community
Own iOS development YouTube channel (matthias_code)
Own successful apps in the store (Basketball Standings, Bluetooth Developer) with 40000+ downloads and top 2 App Store chart rankings
Fluent in German & English, basic knowledge of Spanish, French, Italian, Polish, Dutch

Skills

Development

Ios
Swift
Swiftui
Uikit
Xcui
Rest Apis
Fastlane
Shellscript
Flutter
Dart
Bitrise
Jenkins
Ar
Vr
Healthkit
Widgetkit
Watchos
Graphql
Arkit
The Composable Architecture (Tca)
Bluetooth
Iot
Avfoundation
Visionos
Apple Vision Pro
Realitykit
Firebase
Kotlin Multiplatform
A11y

Project Management

Leadership
Agile & Lean Methodology
Scrum
User Centric Design
Rapid Prototyping
Kanban
Architectural Planning
Public Speaking
Taking Responsibility For Own Work And That Of Team Members
Safe

Languages

German

Native

English

Native

Spanish

Elementary

French

Elementary

Italian

Elementary

...and 2 more

Education

Oct 2012 - Jun 2016

HTW Berlin

Bachelor of Science · Media Informatics · Berlin, Germany

Bachelor of Science (B.Sc.) in Media Informatics, specialized in iOS apps & virtual reality, with special recognition "Best IT Project of HTW Berlin 2015-2016"

Certifications & licenses

Professional Scrum Master I

Scrum.org

Statistics

Experience

Total positions 16

Experience in Information Technology 3.5 y

Avg length 8 m

Longest experience 2 y 1 m

Global Experience

Countries worked in 2 (Germany, United Kingdom)

Primary country Germany

Expertise

Recent roles Senior Flutter Developer, Lead Flutter Developer, Flutter Consultant

Main industries Information Technology, Food and Beverage, Professional Services

Main business areas Information Technology, Product Development, Quality Assurance

Qualifications

Highest degree Bachelor

Certifications earned 1

Profile

Created

May 2024

Last Update

July 2026

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Frequently asked questions

Have questions? Find more information here.

Matthias is based in Berlin, Germany and can operate in on-site, hybrid, and remote work models.

Matthias speaks the following languages: German (Native), English (Native), Spanish (Elementary), French (Elementary), Italian (Elementary), Dutch (Elementary), Polish (Elementary).

Matthias has at least 9 years of experience. During this time, Matthias has worked in at least 9 different roles and for 16 different companies. The average length of individual experience is 1 year and 7 months. Note that Matthias may not have shared all experience and actually has more experience.

Based on recent experience, Matthias would be well-suited for roles such as: Senior Flutter Developer, Lead Flutter Developer, Flutter Consultant.

Matthias's most recent position is Senior Flutter Developer at Materna.

In recent years, Matthias has worked for Materna, VDQ Business Solutions, Immunifriend, Allianz Versicherungen, and Calima Safety.

Matthias is most experienced in industries like Information Technology, Food and Beverage, and Professional Services. Matthias also has some experience in Automotive, Telecommunication, and Insurance.

Matthias is most experienced in business areas like Information Technology, Product Development, and Quality Assurance. Matthias also has some experience in Research and Development.

Matthias has recently worked in industries like Information Technology, Automotive, and Telecommunication.

Matthias has recently worked in business areas like Information Technology and Product Development.

Matthias holds a Bachelor in Media Informatics from HTW Berlin.

Matthias has 1 certificate: Professional Scrum Master I.

Matthias is immediately available full-time for suitable projects.

Matthias's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.

To hire Matthias, click the Meet button on the profile to request a meeting and discuss your project needs.