James Cullimore - Freelance Mobile Developer for Android

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Niedereschach, Germany

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Experience

Jul 2024 - Apr 2025

10 months

Freelance Android Developer

Normalis

Working on Telecommunication Apps on Android under NDA for the Military
Participation in the development of backend services (Spring, Java)
Android Development, Kotlin, Compose, REST, JSON, State-Machines, Android Studio, IP Communication, Cybersecurity, Agile

Jun 2024 - Sep 2024

4 months

Technical Interviewer

MVPMatch

Performing technical interviews with candidates for senior Android & iOS positions

Dec 2023 - Jun 2024

7 months

Senior Android Developer

Lexware

Responsibility for the development of Android apps (Kotlin/Java) in an agile environment
Participation in the development of iOS apps (Swift) in an agile environment
Conduction of code reviews and optimization on existing source code
Writing technical documentation and usage of a ticket system (Confluence & Jira)
Defining & implementing automated UI & Unit tests
Android Development, Kotlin, Jetpack Navigation, Dagger/Hilt, MOSHI, Retrofit, CI/CD, Git, Coroutines, RX Java, Webview, MVVM, Jira, Confluence, CircleCI, Espresso UI Tests, TDD, REST, Compose, Android Studio, JSON, Cybersecurity, Swift

Sep 2023 - Present

3 years 1 month

Freelance Mobile Developer

LTE Consulting

Development of several iOS apps (Swift) and Android apps (Kotlin)
Project consultation
Android Development, Kotlin, Jetpack Navigation, Room, Dagger, Retrofit, CI/CD, Git, Firebase, Coroutines, RX Java, Webview, MVVM, Jira, Confluence, Espresso UI Tests, TDD, Android Studio, REST, JSON, Cybersecurity, iOS, Swift, UIKit, SwiftUI

Sep 2023 - Present

3 years 1 month

Independent Writer

gitconnected

Committed contributor to the gitconnected platform, specializing in writing engaging and informative articles

Aug 2023 - Present

3 years 2 months

Android Instructor

droidcon

Design and develop comprehensive Android development curricula tailored to different skill levels, ensuring a structured learning path for students

Sep 2022 - Present

4 years 1 month

Freelance Android Developer

J&C Bachmann

Responsibility for the development of Android apps (Kotlin/Java) in an agile environment
Participation in the development of backend & web services (Node, Vue, Javascript, Typescript)
Conduction of code reviews and optimization on existing source code
Writing technical documentation and usage of a ticket system (Confluence & Jira)
Defining & implementing automated UI & Unit tests
Android Development, Kotlin, Java, Jetpack Navigation, Room, KOIN, Retrofit, CI/CD, Git, Firebase, Coroutines, RX Java, Webview, MVVM, Modulation, Code Reviews, Pair Programming, TeamCity, Arc, Android Studio, REST, JSON, Cybersecurity, Vue, Node, Typescript, Javascript

Jun 2022 - Apr 2023

11 months

Freelance Android Developer

Lexware

Responsibility for the development of Android apps (Kotlin/Java) in an agile environment
Conduction of code reviews and optimization on existing source code
Writing technical documentation and usage of a ticket system (Confluence & Jira)
Defining & implementing automated UI & Unit tests
Android Development, Kotlin, Jetpack Navigation, Dagger/Hilt, MOSHI, Retrofit, CI/CD, Git, Coroutines, RX Java, Webview, MVVM, Jira, Confluence, CircleCI, Espresso UI Tests, TDD, Compose, Android Studio, REST, JSON

Dec 2021 - Dec 2022

1 year 1 month

Mobile Software Engineer

FarmerJoe GmbH

Responsibility for the development of Android, iOS & React Native apps in an agile environment
New development of React Native, iOS & Android apps (Kotlin) in an agile team
Conduction of code reviews and optimization on existing source code
Writing technical documentation and usage of a ticket system (Confluence & Jira)
Defining & implementing automated UI & Unit tests
Participation of technical interviews of new employees
Android Development, Kotlin, CI/CD, Git, Webview, CircleCI, TDD, Google Maps SDK, iOS, React, React Native

Nov 2021 - Jan 2022

3 months

Freelance Fullstack/Lowcode Developer

Die Biberei

Development and documentation of Proof-of-Concept software ideas
AWS

Oct 2021 - Present

5 years

Freelance Mobile Developer

Benefits.me

Technical consulting & training of new Android & iOS developers
Participation in the development of iOS apps (Swift) and Android apps (Kotlin)
Review of tickets in the SCRUM team
Participation in the conception of testing
Code reviews
Android development, Kotlin, Jetpack Navigation, Room, Dagger, Retrofit, CI/CD, Git, Firebase, Coroutines, RX Java, Webview, MVVM, Jira, Confluence, Espresso UI Tests, TDD, Android Studio, REST, JSON, Cybersecurity, iOS, SwiftUI, UIKit

Sep 2019 - Nov 2021

2 years 3 months

Schiltach, Germany

Mobile Application Developer

Hansgrohe SE

Responsibility for the development of iOS & Android apps in an agile environment
New development of iOS apps (Swift) and Android apps (Kotlin, Java) in an agile team
Conducting code reviews and optimizing existing source code
Writing technical documentation and using a ticket system (Confluence & Jira)
Management of external development teams
Defining & implementing automated UI & Unit tests
Android development, Kotlin, Jetpack Navigation, Dagger/Hilt, MOSHI, Retrofit, CI/CD, Git, Coroutines, RX Java, Webview, MVVM, Jira, Confluence, CircleCI, Espresso UI Tests, IoT, Backend, TDD, Weather API, Android Studio, REST, JSON

Sep 2016 - Present

10 years 1 month

Freelance Android Developer

James Cullimore - Software Engineering

Development of countless Android, iOS and React apps
Web and API development
Development in nearly all branches using countless possible technology combinations
Project, architecture and security consultation
Work on open source projects

Sep 2016 - Jul 2019

2 years 11 months

Konstanz, Germany

Software Engineering Trainee

Eurofins Genomics

Full-stack software and application development for creating a modular LIMS (Laboratory Information Management System) and developer tools for automating/simplifying processes in an international agile team (Java, Spring, Spring Boot, Angular, Maven, Elasticsearch, MySQL, MongoDB, HTML, Javascript, CSS, NGINX, NGINX-Clojure, BIRT)
Performing diagnostics & bug fixes in development & productive systems
Changing, extending & implementing legacy systems
User guides & technical documentation with Markdown, Javadoc & Microsoft Office
Code quality assurance via E2E tests, JUnit tests & JaCoCo
Evaluation, initial setup & integration of modern/new technologies such as Elasticsearch & NGINX-Clojure
Apprenticeship with regular visits to Zeppelin Vocational School in Konstanz for technical education

Aug 2011 - Aug 2016

5 years 1 month

Germany

Diverse work experiences

Various

Feb 2005 - Aug 2011

6 years 7 months

Diverse work experiences

Various

Industry experience

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

Experienced in Information Technology, Education, Biotechnology, Manufacturing, Aerospace and Defense, and Telecommunication.

Information Technology

Education

Biotechnology

Manufacturing

Aerospace and Defense

Telecommunication

Business area experience

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

Experienced in Information Technology, Product Development, Quality Assurance, Project Management, Marketing, and Human Resources.

Information Technology

Product Development

Quality Assurance

Project Management

Marketing

Human Resources

Skills

Languages

Kotlin
Java
Html
Javascript
Typescript
Css
Sql
Json
Markdown
Bash / Cmd / Batch
Swift
Php

Frameworks

Android Sdk
Espresso
Uikit
Swiftui
React
React Native
Vue
Node.Js
Spring
Angular
Jquery
Selenium
Swing

Databases

Elasticsearch
Room
Mysql
Postgres
Firebase Storage
Mongodb
Mariadb
Hsqldb

Operating Systems

Android
Ios
Linux
Windows
Macos

Tools

Maven
Gradle
Git
Ides
Junit
Microsoft Office
Github
I18n / A11y
Bitrise
Bitbucket
Confluence
Jira
Sonar
Docker
Vmware
Aws
Firebase

Concepts / Other

Agile / Scrum
Communication
Training
Documentation
Ui/Ux Design
Testing
Tdd
Oop
Security

Languages

English

Native

German

Advanced

Education

Sep 2016 - Jul 2019

Zeppelin-Gewerbeschule Konstanz

Apprenticeship · IT Specialist in Application Development · Konstanz, Germany

Sep 2006 - Jun 2008

St. Peter's College Secondary School

Leaving Certificate

Sep 2003 - Jun 2006

St. Peter's College Secondary School

Junior Certificate

Certifications & licenses

Driving license Class B

Statistics

Experience

Total positions 16

Experience in Information Technology 10 y

Avg length 3 y

Longest experience 10 y

Global experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles Freelance Android Developer, Technical Interviewer, Senior Android Developer

Main industries Information Technology, Education, Biotechnology

Main business areas Information Technology, Product Development, Quality Assurance

Qualifications

Certifications earned 1

Profile

Member since

July 2025

Last update

July 2026

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Frequently asked questions

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James is based in Niedereschach, Germany.

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

James has at least 22 years of experience. During this time, James has worked in at least 11 different roles and for 14 different companies. The average length of individual experience is 1 year and 4 months. Note that James may not have shared all experience and actually has more experience.

Based on recent experience, James would be well-suited for roles such as: Freelance Android Developer, Technical Interviewer, Senior Android Developer.

James's most recent position is Freelance Android Developer at Normalis.

In recent years, James has worked for Normalis, MVPMatch, Lexware, LTE Consulting, and gitconnected.

James is most experienced in industries like Information Technology, Education, and Biotechnology. James also has some experience in Manufacturing, Agriculture, and Aerospace and Defense.

James is most experienced in business areas like Information Technology, Product Development, and Quality Assurance. James also has some experience in Project Management, Marketing, and Human Resources.

James has recently worked in industries like Information Technology, Education, and Manufacturing.

James has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.

James attended Zeppelin-Gewerbeschule Konstanz for IT Specialist in Application Development.

James has 1 certificate: Driving license Class B.

The availability of James needs to be confirmed.

Daily rate distribution

0 2 4 6 8

<€640 €640-800 €800-960 €1280+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Average rates for similar positions

Rates are based on recent contracts and do not include FRATCH margin.

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Daily rate avg. 745 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

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Median rate 740 €

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 6 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.