Joseph Haas - Frontend Developer (Freelance)

Q: Where is Joseph based?

Joseph is based in Nicosia, Cyprus and can operate in on-site , hybrid , and remote work models.

Q: What languages does Joseph speak?

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

Q: How many years of experience does Joseph have?

Joseph has at least 8 years of experience. During this time, Joseph has worked in at least 7 different roles and for 7 different companies . The average length of individual experience is 1 year and 1 month . Note that Joseph may not have shared all experience and actually has more experience.

Q: What is Joseph's latest experience?

Joseph's most recent position is Frontend Developer (Freelance) at diesdas digital GmbH .

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

In recent years, Joseph has worked for diesdas digital GmbH , Agentur Brandung GmbH , MCM Technology GmbH , Deutsche Post IT Services GmbH , and myhaircutter.de .

Q: Which industries is Joseph most experienced in?

Joseph is most experienced in industries like Information Technology , Retail , and Advertising . Joseph also has some experience in Transportation and Cosmetics .

Q: Which business areas is Joseph most experienced in?

Joseph is most experienced in business areas like Information Technology and Product Development .

Q: Which industries has Joseph worked in recently?

Joseph has recently worked in industries like Information Technology , Retail , and Transportation .

Q: Which business areas has Joseph worked in recently?

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

Recommended expert

Nicosia, Cyprus

Experience

Jul 2025 - Sep 2025

3 months

Berlin, Germany

Frontend Developer (Freelance)

diesdas digital GmbH

Developed Next.js applications with PayloadCMS & TypeScript
Built headless modules in Next.js for PayloadCMS
JavaScript
TypeScript
HTML5
CSS3
Node.js
Next.js
React
git
REST APIs
CSS Modules
Clean Code
Payload

Oct 2024 - Jun 2025

9 months

Cologne, Germany

Frontend Developer (Freelance)

Agentur Brandung GmbH

Enhanced a Next.js-based eCommerce application focusing on the checkout and account pages
Built headless Contentful modules in Next.js using GraphQL
Worked on an AI chatbot solution & an events page with complex theming requirements based on Next.js & TailwindCSS
Integrated the app with external APIs (Personio, Emarsys, etc.)
JavaScript
TypeScript
HTML5
CSS3
Node.js
Next.js
React
git
REST APIs
TailwindCSS
Clean Code
Contentful
GraphQL

Aug 2022 - Aug 2024

2 years 1 month

Fürstenwalde, Germany

Lead Software Developer (Freelance)

MCM Technology GmbH

Developed a React frontend, Express backend & multiple microservices in TypeScript
Set up, deployed & maintained the software on client servers using Ubuntu & Docker
Displayed measurement data in the frontend using d3 & recharts
Built MongoDB aggregation pipelines to process and transform measurement data
Architected & implemented complex requirements
Took on the role of lead developer and coordinated other developers
JavaScript
TypeScript
HTML5
CSS3
Node.js
React
React-Query
git
gitlab pipelines
docker
MongoDB
Ubuntu Server
Styled-Components
MUI
REST APIs
Express
MQTT
TailwindCSS
react-hook-form
Clean Code

Aug 2022 - Feb 2023

7 months

Bonn, Germany

Software Developer - Frontend (Freelance)

Deutsche Post IT Services GmbH

Actively participated in the agile development process (Scrum) within a multidisciplinary and international team
Developed new & existing React components with TypeScript
Achieved 80% test coverage with Jest and Playwright, significantly improving code stability and maintainability
Efficiently identified and fixed critical bugs
Improved app performance through targeted optimizations and refactoring, resulting in faster and more responsive user experience
Debugged and verified data in SQL databases
JavaScript
TypeScript
HTML5
CSS3
Node.js
React
Redux
react-hook-form
JIRA
git
azure
swagger
playwright
Jest
TDD
REST APIs
Code Reviews
Clean Code
SQL

Sep 2021 - Feb 2022

6 months

Cologne, Germany

Fullstack Developer (Freelance)

myhaircutter.de

Designed the architecture for 3 different frontends and a backend with REST API, including data flows
Set up CI/CD pipelines and development environment with Github Actions, Docker, Kubernetes, Ubuntu Server
Built the frontends using technologies like React, Next.js, TailwindCSS, React Query, Redux, and TypeScript
Test Driven Development with Jest and Cypress
Developed complex forms
Integrated internal and external APIs (e.g., Stripe)
Used serverless technologies like cloud functions
Developed a Node.js server with features like cronjobs, authentication, and email
Deployed, set up & integrated MongoDB as the database
JavaScript
TypeScript
HTML5
CSS3
Node.js
React
Redux
React-Query
JIRA
git
Github Actions
Next.js
MongoDB
Serverless Cloud Functions
Ubuntu Server
Styled-Components
Cypress
Jest
TDD
REST APIs
Express
Code Reviews
Clean Code

Aug 2019 - Aug 2021

2 years 1 month

Cologne, Germany

Software Engineer - Frontend (Permanent)

Toom Baumarkt GmbH

Architecture and development of efficient and reusable frontend systems using technologies like React, Redux and TypeScript
Played a key role in planning and implementing the migration to a Micro-Frontend architecture
Test-driven development using Jest and Cypress
Work on a JavaScript backend microservice responsible for server-side rendering of the shop
Close collaboration in an international and interdisciplinary team in an agile environment following Scrum
Creation, enhancement and maintenance of responsive User Interfaces
Ensuring product quality through regular Code Reviews and Pair Programming
Brainstorming and evaluating new technologies and tools for the Frontend area
Regular bug fixing & refactoring to keep the code quality high
JavaScript
TypeScript
Node.js
React
Redux
JIRA
git
gitlab CI/CD
Micro-Frontends
webpack
HTML5
CSS3
Styled-Components
SASS/SCSS
Cypress
Jest
TDD
REST APIs
Pair Programming
Code Reviews
Agile
Scrum
Clean Code
SQL

Feb 2018 - Jul 2019

1 year 6 months

Cologne, Germany

Frontend Developer (Permanent)

Agentur Brandung GmbH

JavaScript
Node.js
React
React Native
Redux
JIRA
git
HTML5
CSS3
Handlebars
jQuery
Vue
Firebase
Code Reviews
Agile
REST APIs
Clean Code

Sep 2016 - Feb 2018

1 year 6 months

Mettmann, Germany

Web Developer

ohaweb.design

JavaScript
HTML5
CSS3
WordPress
jQuery

Industry Experience

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

Experienced in Information Technology, Retail, Advertising, Transportation, and Cosmetics.

Information Technology

Retail

Advertising

Transportation

Cosmetics

Business Area Experience

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

Experienced in Information Technology and Product Development.

Information Technology

Product Development

Skills

React (7+ Years)
Javascript/es6 (9+ Years)
Typescript (6+ Years)
Html5 & Css3
Redux
Styled-components
React-query
Next.js
Graphql
Node.js
Express.js
Mongodb
Micro-frontends
Webpack
Cloud Functions
Serverless
Bug Fixing
Jest
Cypress
Playwright
Git
Frontend Architecture
Agile Working
Jira
Scrum
Kanban
Pair Programming
Code Reviews
Mentoring
Tdd (Test-driven-development)
Office Applications

Languages

German

Native

English

Native

Education

Oct 2014 - Jun 2016

Hochschule Trier

Computer Science (Digital Media) · Trier, Germany

Aug 2005 - Jun 2013

Heinrich-Heine-Gymnasium

High School Diploma (Abitur) · Mettmann, Germany

Statistics

Experience

Total positions 8

Experience in Information Technology 5 y

Avg length 1 y 1 m

Longest experience 2 y

Global Experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles Frontend Developer (Freelance), Lead Software Developer (Freelance), Software Developer - Frontend (Freelance)

Main industries Information Technology, Retail, Advertising

Main business areas Information Technology, Product Development

Qualifications

Profile

Created

August 2025

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Frequently asked questions

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

Where is Joseph based?

Joseph is based in Nicosia, Cyprus and can operate in on-site, hybrid, and remote work models.

What languages does Joseph speak?

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

How many years of experience does Joseph have?

Joseph has at least 8 years of experience. During this time, Joseph has worked in at least 7 different roles and for 7 different companies. The average length of individual experience is 1 year and 1 month. Note that Joseph may not have shared all experience and actually has more experience.

What roles would Joseph be best suited for?

Based on recent experience, Joseph would be well-suited for roles such as: Frontend Developer (Freelance), Lead Software Developer (Freelance), Software Developer - Frontend (Freelance).

What is Joseph's latest experience?

Joseph's most recent position is Frontend Developer (Freelance) at diesdas digital GmbH.

What companies has Joseph worked for in recent years?

In recent years, Joseph has worked for diesdas digital GmbH, Agentur Brandung GmbH, MCM Technology GmbH, Deutsche Post IT Services GmbH, and myhaircutter.de.

Which industries is Joseph most experienced in?

Joseph is most experienced in industries like Information Technology, Retail, and Advertising. Joseph also has some experience in Transportation and Cosmetics.

Which business areas is Joseph most experienced in?

Joseph is most experienced in business areas like Information Technology and Product Development.

Which industries has Joseph worked in recently?

Joseph has recently worked in industries like Information Technology, Retail, and Transportation.

Which business areas has Joseph worked in recently?

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

What is Joseph's education?

Joseph attended Hochschule Trier for Computer Science (Digital Media).

What is the availability of Joseph?

Joseph is immediately available full-time for suitable projects.

What is the rate of Joseph?

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