Patrick Bartels - Senior Ruby on Rails Backend Developer

Recommended expert

Hamburg, Germany

Check rate

Experience

Aug 2024 - Apr 2025

9 months

Berlin, Germany

Senior Backend Developer

stocubo GmbH

Further development of the online shop
Tech stack: Ruby on Rails, JavaScript, Postgres, AWS, Git, Continuous Deployment, Kubernetes, SLIM

Jan 2023 - Present

3 years 8 months

Hamburg, Germany

Senior Backend Developer

vonfoorn GmbH

Backend development
System and software architecture
Prototyping
Project and team leadership

Sep 2022 - Jul 2024

1 year 11 months

Hamburg, Germany

Senior Backend Developer

Penseo GmbH

Further development of a portal for employee benefits
Tech stack: Ruby on Rails, JavaScript, VueJS, Vuex, Firebase, Postgres, AWS, Git, Jest, Cypress, Continuous Deployment

Apr 2022 - Sep 2022

6 months

Berlin, Germany

Senior Backend Developer

ucm.agency

Backend development of new features for the ucm app
Tech stack: Ruby on Rails, React Native, Continuous Deployment, AWS, Git

Oct 2021 - Mar 2022

6 months

Wiesbaden, Germany

Senior Fullstack Developer

odacer finanzsoftware GmbH

Development of new features for papierkram.de
Tech stack: Ruby on Rails, HAML, SASS, Docker, Git

Sep 2020 - Mar 2021

7 months

Heidelberg, Germany

Senior Backend-Developer

Getsafe Digital GmbH

Backend development of new features for the Getsafe app
Integration of price comparison portals from the UK market
IT environment: Ruby on Rails, HAML, SASS, Docker, Git, Continuous Deployment, Event Sourcing, Domain Driven, Redis

Oct 2019 - Apr 2020

7 months

Essen, Germany

Senior Backend-Developer

Innogy SE

Backend development of new features for the Getsafe app
Integration of price comparison portals from the UK market
IT environment: Ruby on Rails, HAML, SASS, Docker, Git, Continuous Deployment, Redis

Apr 2019 - Apr 2020

1 year 1 month

Düsseldorf, Germany

Lead Backend-Developer

Mintano UG

Backend development of new features for the Onebooth app
Further development of the web portal
IT environment: Ruby on Rails, HAML, SCSS, Git, Continuous Deployment, React Native, Redis

Sep 2016 - Apr 2017

8 months

Hamburg, Germany

Senior Backend-Developer

Wacku UG

Development of a social network based on Event Sourcing
IT environment: Ruby on Rails, HAML, Git, Continuous Deployment, AWS, Redis, Event Sourcing, Elasticsearch, Docker

Jun 2016 - Oct 2022

6 years 5 months

Cologne, Germany

Senior Backend-Developer

1 FC Köln GmbH & Co KGaA

Development of the backend for fc-spruchmaschine.de
IT environment: Ruby on Rails, HAML, SASS, Git, Continuous Deployment, Heroku, Redis

Oct 2015 - Dec 2022

7 years 3 months

Cologne, Germany

CTO and Fullstack Developer

heysite GmbH

Concept and development of the heysite.io website
Tech stack: Ruby on Rails, HAML, SASS, Git, Heroku, Redis, Elasticsearch, Docker, JavaScript

Jul 2015 - Oct 2019

4 years 4 months

Cologne, Germany

Fullstack Developer

Köln-Düsseldorfer Deutsche Rheinschiffahrt AG

Further development of a ticket shop we built ourselves
Tech stack: Ruby on Rails, HAML, SASS, Git, Heroku, Redis, JavaScript

May 2013 - Apr 2015

2 years

Munich, Germany

Backend Developer

BMW AG

Development of a sales platform for the newly introduced i models
Tech stack: Ruby on Rails, Git, AWS, Redis, Continuous Deployment

Jan 2013 - Jan 2013

1 month

Juba, SS

Fullstack Developer

IRC and UNHCR

Development of a platform to record refugees and connect to UN servers
Tech stack: Ruby on Rails, Git, Redis, HAML, SASS

Jan 2012 - Nov 2015

3 years 11 months

Mae Sot, Thailand

Backend Developer

Karen Human Rights Group

Concept and development of a platform to record and analyze reports
Tech stack: Ruby on Rails, Git, HAML, SCSS

Industry Experience

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

Experienced in Information Technology, Sport, Tourism, Government and Administration, Automotive, and Insurance.

Information Technology

Sport

Tourism

Government and Administration

Automotive

Insurance

Business Area Experience

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

Experienced in Information Technology, Product Development, and Project Management.

Information Technology

Product Development

Project Management

Skills

Backend Development
System And Software Architecture
Prototyping
Project And Team Leadership
Industry Expertise: E-Commerce, Platforms, Automotive, Insurance, Finance, Digitalization
Programming Languages: Ruby, Python, Java, Javascript/Es6, Go, Elixir
Databases: Postgresql, Mysql/Cloudsql, Firebase, Mongodb
Frameworks: Ruby On Rails, Vue, Angular, React, React Native, Django

Languages

German

Native

English

Advanced

Education

Oct 2007 - Sep 2010

HAW Hamburg

B.Sc. in Applied Computer Science · Applied Computer Science · Hamburg, Germany

Statistics

Experience

Total positions 15

Experience in Information Technology 11 y

Avg length 2 y 2 m

Longest experience 7 y 2 m

Global Experience

Countries worked in 3 (Germany, SS, Thailand)

Primary country Germany

Expertise

Recent roles Senior Backend Developer, Senior Fullstack Developer, Senior Backend-Developer

Main industries Information Technology, Sport, Tourism

Main business areas Information Technology, Product Development, Project Management

Qualifications

Highest degree Bachelor

Profile

Created

November 2023

Last Update

September 2025

Need a freelancer? Find your match in seconds.

Try FRATCH GPT

Frequently asked questions

Have questions? Find more information here.

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

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

Patrick has at least 15 years of experience. During this time, Patrick has worked in at least 7 different roles and for 15 different companies. The average length of individual experience is 1 year. Note that Patrick may not have shared all experience and actually has more experience.

Based on recent experience, Patrick would be well-suited for roles such as: Senior Backend Developer, Senior Fullstack Developer, Senior Backend-Developer.

Patrick's most recent position is Senior Backend Developer at stocubo GmbH.

In recent years, Patrick has worked for stocubo GmbH, vonfoorn GmbH, Penseo GmbH, ucm.agency, and odacer finanzsoftware GmbH.

Patrick is most experienced in industries like Information Technology, Sport, and Tourism. Patrick also has some experience in Government and Administration, Automotive, and Insurance.

Patrick is most experienced in business areas like Information Technology, Product Development, and Project Management.

Patrick has recently worked in industries like Information Technology, Sport, and Retail.

Patrick has recently worked in business areas like Information Technology, Product Development, and Project Management.

Patrick holds a Bachelor in Applied Computer Science from HAW Hamburg.

Patrick is immediately available full-time for suitable projects.

Daily Rate Distribution

0 1 2 3 4

<€720 €720-800 €800-880 €960-1040 €1040-1120 €1120+

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

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

Average rates for similar positions

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

1000

750

500

250

Daily rate avg. 919 €

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

1000

750

500

250

Median rate 896 €

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.

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