Jan Kronenberg-Software-Architect & Full-Stack Developer
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Experience
Software Architect: Training Platform for IT Career Changers
appvanced
- Mobile: Kotlin Multiplatform (KMP), Kotlin, Swift, SwiftUI, Jetpack Compose, Ktor, Room, Koin
- Backend: Spring Boot, GCP Cloud Run, GCP Load Balancer, GCP Eventarc
- Planned and developed a cloud backend architecture with Google Cloud Platform
- Developed a cross-platform architecture with Kotlin Multiplatform (KMP)
- Tech lead for comprehensive large project including webshop, two apps and omnichannel backend
Software-Architect & Full-Stack Developer
ARS Digital GmbH
- Mobile: Kotlin Multiplatform (KMP), Kotlin, Swift, SwiftUI, Ktor, Room, Koin
- Backend: Spring Boot, AWS API Gateway, AWS Lambda, AWS S3, AWS EventBridge
- Developed a serverless omnichannel backend architecture with AWS (API-first & cloud-native)
- Developed a native app architecture for iPadOS
- Developed a cross-platform app architecture with Kotlin Multiplatform
- Onboarded, advised and mentored multiple software developers
- Provided IT personnel consulting including candidate evaluation and conducting interviews
- Integrated various external systems (CMS, PIM, CRM, e-commerce, ERP)
Full-Stack Developer: Further development of the Flutter app “Low Carb Recipe of the Day”
OnVersum GmbH
- Mobile: Flutter, Dart
- Backend: Firebase Authentication, Firestore, Firebase Cloud Functions
- Developed a cloud backend architecture with Google Cloud Platform
- Extended functionality including backend communication
Mobile Developer: iOS & Android App for a German Healthcare Association
Explicatis GmbH
- Technologies: Swift, SwiftUI, Kotlin, Jetpack Compose, Ktor, Alamofire, Koin, Swinject
- Developed a native iOS and Android app with Swift, SwiftUI, Kotlin and Jetpack Compose for managing contact data, appointments etc. for recipients and their contacts of a German healthcare association
- Onboarded and mentored junior software developers
- Integrated a cloud backend based on Microsoft Azure
Mobile Developer: IoT App for Controlling a Smart Baby Cradle
Explicatis GmbH
- Technologies: Kotlin Multiplatform (KMP), Kotlin, Swift, SwiftUI, Jetpack Compose, Ktor, Realm, Koin, Bluetooth LE, Websocket
- Developed a cross-platform app for iOS and Android with Kotlin Multiplatform Mobile to control a smart baby cradle via Bluetooth and cloud connection over Websocket
- Onboarded and mentored junior software developers
- Integrated a cloud backend based on Microsoft Azure
- Awarded the German Innovation Award
Mobile Developer: Meditation App for Crisis Management
Explicatis GmbH
- Technologies: Kotlin Multiplatform (KMP), Kotlin, Swift, SwiftUI
- Developed a cross-platform iOS and Android app with Kotlin Multiplatform to help cope with crises using guided meditation
Full-Stack Developer: Progressive Web App for Exchanging Digital Business Cards
Anonymous Client
- Web: Angular, TypeScript, NodeJS
- Backend: AWS, TypeScript, NodeJS, AWS API Gateway, AWS Lambda, AWS DynamoDB
- Developed a progressive web app (PWA) with Angular for exchanging and managing digital business cards via QR codes
- Implemented a serverless cloud solution with AWS
Data Engineer: Business Intelligence Project
Natsu Foods GmbH & Co. KG
- Implemented a business intelligence project for a major German fresh produce company to calculate sales forecasts based on historical sales data, holidays and other factors to determine accurate delivery quantities
- Implemented ETL pipelines
Industry experience
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Experienced in Information Technology, Food and Beverage, Education, and Healthcare.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, and Business Intelligence.
Summary
As a software architect and full-stack developer with a focus on Kotlin Multiplatform (KMP), I’d be happy to support you in planning and developing mobile apps for iOS and Android as well as cloud microservices with Spring Boot.
By leveraging KMP, a connected ecosystem can be created.
With custom-built KMP SDKs, data models and business logic can be shared across multiple frontend projects, and additionally with a Spring Boot backend. This significantly reduces development and maintenance effort and enables a connected, consistent ecosystem.
I’m passionate about innovative applications that deliver real value.
You’ll feel that passion in every meeting and in the results I deliver.
Over a decade of full-stack development expertise.
Skills
- Development Of Mobile Apps For Ios & Android
- Languages & Frameworks: Swift, Swiftui, Kotlin, Jetpack Compose
- Libraries: Ktor, Room, Koin, Koog (Ai Agents)
- Focus: Kotlin Multiplatform (Kmp)
- Development Of Cloud Microservices With Spring Boot
- Languages: Kotlin, Java
- Cloud Services: Amazon Web Services (Aws): Api Gateway, Lambda, S3, Eventbridge
- Cloud Services: Google Cloud Platform (Gcp): Cloud Run, Cloud Load Balancing, Cloud Storage, Eventarc, Vertex Ai
- Cloud Services: Firebase: Authentication, Firestore, Analytics, Crashlytics, Cloud Functions
- Libraries: Spring Boot Web, Koog (Ai Agents)
- Development Of Kotlin Multiplatform (Kmp) Sdks For Connected Ecosystems
Languages
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Experience
Global experience
Expertise
Profile
Frequently asked questions
Have questions? Find more information here.
Jan is based in Neuss, Germany and prefers 100% remote projects.
Jan speaks the following languages: German (Native), English (Advanced).
Jan has at least 7 years of experience. During this time, Jan has worked in at least 8 different roles and for 6 different companies. The average length of individual experience is 1 year and 10 months. Note that Jan may not have shared all experience and actually has more experience.
Based on recent experience, Jan would be well-suited for roles such as: Software Architect: Training Platform for IT Career Changers, Software-Architect & Full-Stack Developer, Full-Stack Developer: Further development of the Flutter app “Low Carb Recipe of the Day”.
Jan's most recent position is Software Architect: Training Platform for IT Career Changers at appvanced.
In recent years, Jan has worked for appvanced, ARS Digital GmbH, OnVersum GmbH, Explicatis GmbH, and Natsu Foods GmbH & Co. KG.
Jan is most experienced in industries like Information Technology, Food and Beverage, and Education. Jan also has some experience in Healthcare.
Jan is most experienced in business areas like Information Technology, Product Development, and Business Intelligence.
Jan has recently worked in industries like Information Technology, Food and Beverage, and Education.
Jan has recently worked in business areas like Information Technology, Product Development, and Business Intelligence.
The availability of Jan needs to be confirmed.
Daily rate distribution
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Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 28 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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