Fullstack Engineer (m/w/d)

Become a Fullstack Engineer with sonnen in Cairo, Egypt, and contribute to the development of innovative energy solutions. Engage in the entire development process, maintain Ruby on Rails services, and implement user-friendly frontends. Enjoy a collaborative Agile environment and the opportunity to work on cutting-edge technology. Join sonnen as a Fullstack Engineer in Cairo, Egypt, and play a vital role in driving the energy transition. Participate in the full development process, maintain Ruby on Rails services, and create user-friendly frontends with modern technologies. Collaborate in an Agile environment, utilizing CI/CD processes and contributing to innovative energy solutions. Enjoy the chance to work with a passionate team dedicated to shaping a sustainable future.

sonnen Cairo, Egypt On-site Full Time UTC+02:00

sonnen

Company Overview

Name

Sonnen GmbH, a subsidiary of Shell

Headquarters

Wildpoldsried, Bavaria, Germany

Founded

2010

Size

Over 700 employees worldwide (as of 2020) (source: wikipedia.org). Revenue data is not publicly available as the company is private.

What They Do

Sonnen GmbH is a leading company in the field of intelligent lithium iron phosphate (LiFePO4) home storage systems that are safe and sustainable. The products are designed to store excess energy from photovoltaic systems and promote energy independence for users. Key products include the modular sonnenBatterie, available in various sizes, as well as solutions like sonnenCommunity, which allows users to share renewable energy (source: sonnengroup.com). Sonnen has evolved from a battery manufacturer to an energy provider and operates one of the largest virtual power plants in the world, based on home storage systems.

Projects & Track Record

Notable projects by Sonnen include the sonnenCommunity, which connected over 50,000 households by 2020, enabling them to share renewable energy in a decentralized manner. By 2020, over 90,000 sonnenBatterien had been installed worldwide, allowing households to act as "small power plants" (source: sonnengroup.com). The production facilities in San Jose, California, and Atlanta, Georgia, support the U.S. markets and research and development. Sonnen has also partnered with companies like ES Solar and Haas Home Technologies to offer integrated solar battery solutions.

Recent Developments

In the past two years, there have been no major announcements or acquisitions; however, the acquisition by Shell in 2019 was confirmed in July 2023 (source: kfw.de). Sonnen continues to have over 90,000 installations and offers a standard 10-year warranty on its products. The ten-year anniversary celebration in 2020 highlighted the company's achievements, including connecting over 50,000 households and reaching a workforce of 700.

Working There

Sonnen offers a variety of roles in engineering, manufacturing, sales, and energy supply. The workforce has grown from 200 to over 700, indicating increasing demand in technical and expansion-oriented departments (source: wikipedia.org). The company culture fosters innovation and a decentralized team that operates in the rural environment of Bavaria while also acting globally. The headquarters is located in Wildpoldsried, where the core production of 1,000 units per month takes place.

Contact

Website · Careers · LinkedIn

Last updated on 2025-12-26 | Report an issue

Job Description

At sonnen, we're driven by a clear goal: creating a future powered by clean, affordable energy for everyone. That's why we make our customers independent - not only from fossil fuels, but also from rising electricity costs.

The key to this independence is our intelligent, all-in-one energy system. It combines solar panels, battery storage, energy tariffs, and wallboxes - all developed and manufactured in Germany.

As the first and only provider in Germany, we also connect thousands of home batteries into one shared network: the sonnenVPP, our industry-leading virtual power plant.

In short: every day, we're working to shape the energy future. And we'd be thrilled to have you join us!

What you will do to help drive the energy transition

Participate in the entire development process, including refinements, code reviews, tests, deployment and monitoring on production.
Maintain and extend our Ruby on Rails based services.
Implement user friendly frontends using modern technologies including Hotwire.
Build and maintain GraphQL interfaces and RESTful endpoints (JSON:API).
Convert acceptance criteria into test cases written in RSpec framework.
Write new and update existing documentation entries.
Contribute to the implementation of micro-services.
Push and follow up on builds and deploys, using CI/CD pipeline tools.
Collaborate with a development team on the planning and implementation of tasks, troubleshoot of issues, and refactoring.
Interpretate log messages and mitigate errors coming from our monitoring tools.
Collaborate closely with cross-functional teams in an Agile development environment, familiar with a Software Delivery Lifecycle following Scrum practices.

What you will need on that journey

2+ years of full-stack experience with Ruby on Rails, RSpec and GraphQL
Proficiency with CI/CD processes (GitLab/GitHub), backend infrastructure (AWS) and monitoring tools (Datadog).
You are keen on following architectural paradigms & object-oriented patterns.
You are open-minded to follow instructions from other senior developers.
You are outspoken and see feedback exchange as a normal part of your everyday work.
You comfortably express your ideas and arguments in good spoken and written English.