Jan Kronenberg - Software-Architect & Full-Stack Developer

Q: Where is Jan based?

Jan is based in Neuss, Germany and prefers 100% remote projects.

Q: What languages does Jan speak?

Jan speaks the following languages: German (Native), English (Advanced) .

Q: How many years of experience does Jan have?

Jan has at least 6 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 9 months . Note that Jan may not have shared all experience and actually has more experience.

Q: What is Jan's latest experience?

Jan's most recent position is Software Architect: Training Platform for IT Career Changers at appvanced .

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

In recent years, Jan has worked for appvanced , ARS Digital GmbH , OnVersum GmbH , Explicatis GmbH , and Natsu Foods GmbH & Co. KG .

Q: Which industries is Jan most experienced in?

Jan is most experienced in industries like Information Technology (IT) , Food and Beverage , and Education . Jan also has some experience in Healthcare .

Q: Which business areas is Jan most experienced in?

Jan is most experienced in business areas like Information Technology (IT) , Product Development , and Business Intelligence .

Q: Which industries has Jan worked in recently?

Jan has recently worked in industries like Information Technology (IT) , Food and Beverage , and Education .

Q: Which business areas has Jan worked in recently?

Jan has recently worked in business areas like Information Technology (IT) , Product Development , and Business Intelligence .

Recommended expert

Neuss, Germany

Experience

Jul 2024 - Feb 2025

8 months

Neuss, Germany

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

Sep 2023 - Present

2 years 6 months

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)

Jul 2023 - Jan 2024

7 months

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

Nov 2022 - May 2023

7 months

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

Jun 2022 - Feb 2023

9 months

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

May 2022 - Jun 2022

2 months

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

May 2020 - Sep 2020

5 months

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

Nov 2019 - Apr 2022

2 years 6 months

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

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (3.5 years), Food and Beverage (3 years), Education (0.5 years), and Healthcare (0.5 years).

Information Technology

Food and Beverage

Education

Healthcare

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (4 years), Product Development (4 years), and Business Intelligence (2.5 years).

Information Technology

Product Development

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

German

Native

English

Advanced

Profile

Created

February 2026

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Jan based?

Jan is based in Neuss, Germany and prefers 100% remote projects.

What languages does Jan speak?

Jan speaks the following languages: German (Native), English (Advanced).

How many years of experience does Jan have?

Jan has at least 6 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 9 months. Note that Jan may not have shared all experience and actually has more experience.

What roles would Jan be best suited for?

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”.

What is Jan's latest experience?

Jan's most recent position is Software Architect: Training Platform for IT Career Changers at appvanced.

What companies has Jan worked for in recent years?

In recent years, Jan has worked for appvanced, ARS Digital GmbH, OnVersum GmbH, Explicatis GmbH, and Natsu Foods GmbH & Co. KG.

Which industries is Jan most experienced in?

Jan is most experienced in industries like Information Technology (IT), Food and Beverage, and Education. Jan also has some experience in Healthcare.