Georg Ledermann - Full-Stack-Developer - Ruby on Rails

Recommended expert

Jülich, Germany

Experience

Jan 2021 - Present

5 years 1 month

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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

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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

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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

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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

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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

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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 1 month

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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

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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

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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 1 month

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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