Georg Ledermann - Full-Stack Ruby on Rails Developer

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Jülich, Germany

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Experience

Jan 2021 - Present

5 years 8 months

Solectrus

Dashboard application for visualizing power generation and consumption, as well as profitability calculations of a photovoltaic system.
The software is strictly modular and versatile, also usable on devices like Raspberry Pi or NAS systems, and offers connectivity to a wide range of PV installations.
A steadily growing community appreciates the intuitive interface and high reliability of the tool.
The source code is publicly available (open source), and development is funded through a sponsorship model.
Technologies: Ruby on Rails, InfluxDB, Docker, MQTT

Jan 2021 - Dec 2022

2 years

Survey Engine + Survey App

Development of an engine for creating dynamic surveys for market research with definition and validation via a JSON schema.
Programming of the extensive class hierarchy in TypeScript with a test suite and 100% coverage.
Development of a Progressive Web App with Ruby on Rails and Vue.js for completing surveys on various devices.
Technologies: TypeScript, JSON Schema, Jest, Vue.js

Jan 2018 - Dec 2024

7 years

AstroDNA

Implementation of a backend for astrological calculations based on precise specifications and secured by an extensive test suite.
Development of a custom shop frontend with payment handling and integration through a bespoke API.
Technologies: Ruby on Rails, Vue.js, Tailwind CSS, RESTful API, Stripe

Jan 2018 - Dec 2020

3 years

TowerApp

Development of a customer loyalty application where end customers can register via kiosks in stores.
Integration of a customer card with a QR code for viewing the customer account.
Implemented for an international food retailer on behalf of SayWay GmbH and deployed in many thousands of stores.
Technologies: Ruby on Rails, Vue.js, QR code, RESTful API

Jan 2017 - Dec 2018

2 years

Beraterbörse.com

Development of an open platform for choosing business consultants for different target groups like founders, interim management, or business succession.
Implemented and maintained on behalf of Creditreform Consulting Networks GmbH.
Technologies: Ruby on Rails, PostgreSQL, Bootstrap

Jan 2017 - Dec 2017

1 year

How fit is your company?

Development of a website for playful quick checks on business fitness across various categories.
Implemented on behalf of Creditreform Consulting Networks GmbH with ongoing support.
Technologies: Ruby on Rails, PostgreSQL, Bootstrap

Jan 2010 - Present

16 years 8 months

FINTURIO

Development of a web-based CRM/ERP solution for small businesses with a simple structure for communication and task management.
Offered as SaaS via completho Software GmbH.
Technologies: Ruby on Rails, MySQL, Elasticsearch, Bootstrap

Jan 2008 - Dec 2009

2 years

SalesKing

Co-founded and supported the company for two years.
Assisted in developing a web-based invoicing platform for freelancers and small agencies.
Offered as SaaS.
Technologies: Ruby on Rails, MySQL

Jan 2007 - Dec 2008

2 years

woobby

Developed a portal for aggregated user experiences and opinions in the form of rankings in the Web 2.0 era.
Implemented on behalf of a web agency.
Technologies: Ruby on Rails, MySQL

Jan 1999 - Present

27 years 8 months

MAKROS/Win

Developed Windows software for financial service providers to manage clients, insurance contracts, and commission accounting.
Licensed to insurance brokers and financial distributors with extensive reporting features.
Technologies: Delphi, Windows

Industry Experience

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

Experienced in Banking and Finance, Insurance, Information Technology, Energy, Food and Beverage, and Retail.

Banking and Finance

Insurance

Information Technology

Energy

Food and Beverage

Retail

Business Area Experience

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

Experienced in Information Technology, Accounting, Finance, Product Development, Business Intelligence, and Marketing.

Information Technology

Accounting

Finance

Product Development

Business Intelligence

Marketing

Languages

German

Native

English

Intermediate

Statistics

Experience

Total positions 10

Experience in Banking and Finance 27.5 y

Avg length 6 y 10 m

Longest experience 27 y 7 m

Expertise

Main industries Banking and Finance, Insurance, Information Technology

Main business areas Information Technology, Accounting, Finance

Profile

Created

September 2025

Last Update

September 2025

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Frequently asked questions

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

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

Georg has at least 28 years of experience. During this time, Georg has worked and for 10 different companies. The average length of individual experience is 3 years and 9 months. Note that Georg may not have shared all experience and actually has more experience.

In recent years, Georg has worked for Solectrus, Survey Engine + Survey App, AstroDNA, FINTURIO, and MAKROS/Win.

Georg is most experienced in industries like Banking and Finance, Insurance, and Information Technology. Georg also has some experience in Energy, Food and Beverage, and Retail.

Georg is most experienced in business areas like Information Technology, Accounting, and Finance. Georg also has some experience in Product Development, Business Intelligence, and Marketing.

Georg has recently worked in industries like Banking and Finance, Insurance, and Information Technology.

Georg has recently worked in business areas like Information Technology, Accounting, and Finance.

Georg is immediately available full-time for suitable projects.

Daily Rate Distribution

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<€560 €640-720 €720-800 €800-880 €880-960 €960+

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. 834 €

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 800 €

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.