63d ago
Job description
We're not just looking for someone who can write lines of code; we're seeking an individual who can think beyond code and question the "why" and "how" behind our software engineering processes while understanding the importance of our connection to our customers. As a Firmware Engineer (m/f/d) at STABL Energy, you will drive innovation, solve complex challenges, and contribute to the success of our groundbreaking projects.
Your mission
- Design, implement, and test firmware for our cutting-edge power electronics products.
- Continue to implement new ways of assuring firmware quality.
- Collaborate with cross-functional teams to define project requirements and objectives, with a keen focus on meeting and exceeding customer expectations.
- Evaluate and optimize existing firmware code to enhance performance, reliability, and efficiency.
- Mentor and guide junior engineers, fostering a culture of continuous learning and improvement.
- Promote best practices in software engineering, emphasizing the importance of a holistic approach beyond just coding and its direct impact on customer satisfaction.
Your profile
- 4+ years of experience in firmware development for power electronics or other embedded systems.
- Comprehensive skills in the C programming language, in particular for embedded devices.
- Expertise on guiding firmware projects to professional standards.
- Strong problem-solving skills and the ability to think critically about software design and architecture.
- Proven ability to design and maintain robust firmware development ecosystems, including build infrastructure, modular frameworks, testing pipelines, and scalable release processes.
- Excellent English communication skills, with the ability to collaborate effectively with cross-functional teams and translate customer needs into technical solutions.
- You have interest and experience with a few of the following:
- Real-time operating systems (RTOS).
- Communication protocols such as SPI, UART, and CAN.
- Microcontroller architectures.
- Continuous integration (CI).
- Testing strategies.
- Product releases and versioning.
- Build systems (e.g.make,CMake).
Why STABL Energy?
STABL Energy is one of the most innovative start-ups in the energy transition, ees Award winner 2022, pv magazine award winner 2025 and named a global Top100 Energy Start-up. We are funded by renowned and experienced Tech VCs from Germany, Denmark and Switzerland.
What you'll love about working with us:
- Agile, open & innovation-driven culture with flat hierarchies, quick decision-making processes and real ownership
- Company pension scheme to support you plan for the future
- Flexible working hours, a hybrid work model, and the option to work remotely from abroad
- Digital meal vouchers with Circula Lunch - enjoy tasty lunches on us!
- Monthly benefit in kind to spend at your favourite stores
- Corporate benefits portal with exclusive employee discounts
- Regular team-building activities and team events
- Company EGYM Wellpass membership to train with no limits at numerous fitness clubs across Germany
Ready to innovate, impact, and inspire? Apply Now!
We'd love to hear from you to help us build the energy system of the future! Even if you don't meet 100% of the requirements, we encourage you to apply anyway. Our motto is 'Hire for attitude, train for skills', so we value potential and lifelong learning just as much as experience.
Pay & benefits
Retirement plan
Flexible hours
Meal allowance
Typical pay for similar roles
Estimate€42,000–78,000 annually
Mid level · Germany ·
81 similar jobs
The middle half of pay advertised on Rejobs for this group over the last 24 months. This employer has not stated a salary.
About this role
Posted
8 Oct 2026
Updated
8 Oct 2026
Job type
Full time
Workplace
Hybrid
Sectors
Working hours
UTC+01:00
Experience
4+ years in firmware development
Employerstabl.com
LinkedInSTABL Energy
About STABL Energy
Company Overview
Name
STABL Energy GmbH
HeadquartersMunich, Germany
Founded2019
SizeThe company employs approximately 90 people (source: stabl.com).
What They Do
STABL Energy develops modular power electronics technologies for stationary battery storage systems with the goal of making commercial and industrial storage solutions safer, more efficient, and better suited for second-life batteries from electric vehicles (source: stabl.com). The company relies on a patented modular multilevel inverter technology that replaces conventional central inverters and battery management systems, specifically optimized for stationary battery storage (source: stabl.com). This technology improves efficiency, enhances battery voltage safety, and expands usable capacity, reducing efficiency losses by up to 70% compared to conventional models (source: stabl.com). STABL Energy offers complete battery storage solutions for medium and large commercial applications, focusing on industrial customers, cities, municipalities, cooperatives, and agricultural businesses in the DACH region (source: stabl.com). The systems are suitable for both new and second-life batteries, enabling the reuse of retired EV batteries and thereby improving resource efficiency and battery lifespan (source: stabl.com).
Projects & Track Record
STABL Energy has already commissioned several battery storage systems used in both off-grid and grid-supporting applications (source: stabl.com). In 2023, initial pilot plants were successfully launched in Germany and Switzerland (source: infineon.com). A significant project is underway in Austria, where STABL delivered seven battery storage systems to Elektrowerk Schröder, an operator of hydropower plants in Styria. This project supplies around 2,400 households and represents STABL’s first international deployment (source: bayern-innovativ.de). Additionally, STABL collaborates with partners such as Infineon, which supplies their MOSFETs, and is part of the Infineon Partner Program (source: infineon.com). Previous collaborations include pilot projects with Deutsche Bahn and Kia, highlighting the broad applicability of the technology (source: unreasonablegroup.com).
Recent Developments
In August 2023, STABL Energy secured a €15 million funding round involving Nordic Alpha Partners, the European Innovation Council, UVC Partners, UnternehmerTUM VC Fund III, and the Smart Energy Innovation Fund from Energie 360°. These funds are intended to support the growth phase and market expansion of battery storage systems based on used EV batteries (source: tech.eu). In the same year, Infineon published a press release highlighting STABL’s second-life battery solution and confirming the commissioning of the first pilot plants in Germany and Switzerland (source: infineon.com). The 2024 financial reports showed equity of €7.8 million and a net loss of €4.7 million, while total investments from private and public investors are estimated to exceed €20 million (source: bayern-innovativ.de).
Working There
STABL Energy describes itself as a diverse team of more than 80 employees from 24 different nations, strongly focused on engineering, research, and development in power electronics and energy management (source: stabl.com). The company culture is rooted in its origins as a spin-off from several universities and emphasizes innovation and sustainable energy storage solutions (source: stabl.com). The workforce includes specialists in hardware development, power electronics, battery technology, research & development, as well as marketing and communications, reflecting the diverse demands of a growth-oriented technology company (source: linkedin.com). STABL promotes an open and international working environment based in Munich and offers career opportunities in a forward-looking renewable energy sector (source: stabl.com).
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