Electronic Engineer (Embedded Systems) @ Bihar Batteries
San Sebastian (Basque Country, Spain) | Hybrid (Remote/In-Person)
Start Date: May/June 2026
Full-time | Permanent
⏱️ 5-7 years of experience | Competitive Salary + Phantom Shares
About Us
You've seen many job posts, we know. This one might look like the others, but what we’re building, and the role you could play in it, is something we are very excited about.
We are Bihar Batteries, a new-generation battery startup based in San Sebastian. We are building sodium-ion storage systems, a critical technology that gives people, businesses, and communities control over their energy .
Unlike lithium-ion, our sodium-ion technology is made with locally abundant raw materials like salt. This means no critical supply chains, and a hopeful path towards energy independence in Europe.
This technology is at the heart of our product: a modular battery system that can power everything from off-grid mountain refuges to industrial companies and regions.
Here are some highlights of what we’ve achieved so far:
We have developed a working sodium battery prototype and our proprietary sodium cells .
We have partnered with leading industrial companies and research centers to scale up, such as CIC energiGUNE and Battera.
We are backed by renowned European investors and have received significant public support to support our operations.
We believe batteries should not only be reliable, but also well-designed, easy to use, and attractive. This is why we are building a team that can turn these pieces into a product that people will be proud to use.
What We’re Looking For
We are looking for an Electronic Engineer to lead the control electronics of our battery system. This involves integrating components of commercially available Battery Management Systems and Energy Management Systems into our product, as well as developing new electronic components for our system.
We are looking for a curious and proactive ‘builder’ that is motivated with the challenge of joining an early stage company like Bihar, and that enjoys working in small, agile teams.
We want you to feel that Bihar’s product is your product, and to be part of the company’s growth from a small group of individuals to an organization with international ambition.
What we Need
Degree in Electronic Engineering, preferably with a Master’s in Embedded Systems .
Deep understanding of Battery Management Systems (BMS) and Energy Management Systems (EMS), with an ability to assess, test, integrate and modify them, including uC programming (C/C++).
Communication protocols expertise (ie. CAN Bus, Modbus, RS485, I2C, SPI, UART), and wireless WiFi/Bluetooth systems.
Knowledge on Python/RTOS, and AI programming tools.
Ability to develop PCBs from scratch, including designing, prototyping, testing, and iterating (KiCad, schemes, Gerbers, BOM).
Understand the functioning of power electronic battery components (DC/DC, DC/AC, AC/DC) and being able to integrate and work with them.
Ability to work fluently in Spanish and English .
Based in San Sebastian or willingness to spend significant time in the city (hybrid position).
️ What You’ll Be Working On
Integrating commercial BMS and EMS components into Bihar’s modular sodium-ion stationary storage system.
Designing, prototyping, and coordinating the development of new control electronic components, especially for BMS and EMS’s .
Developing the necessary firmware/software for BMS and EMS components.
Integrating control electronic components with power electronic components with a sense of product.
Assisting in product development and certification processes, such as Electromagnetic Compatibility (EMC) .
Interacting with R&D, product design and manufacturing teams to scale electronics, as well as clients.
Managing relationships with suppliers and product manufacturers.
Assisting with product management and certification .
Hiring and mentoring new teammates as we grow.
What We Offer
Hybrid work flexibility, with the chance to combine remote focus time and in-person prototyping in our San Sebastian workspace.
A competitive salary adapted to your experience, plus phantom shares.
Brand new equipment both to design as well as to prototype (you choose).
️ A career plan tailored to your experience and ambition.
Training & education budget (courses, books, travel to events).
Referral bonus for bringing in great people to the team.
✈️ An annual company offsite with the team to enjoy, talk and discuss company strategy.
Why Join Us?
Purpose
Work on cutting-edge sodium-ion battery technology at a time when the world needs alternatives to lithium. Shape products that will power communities, companies, and outdoor environments, while strengthening European energy sovereignty.
Ownership
Since you will be joining a compact, highly-collaborative team, your work will determine our product, culture, and company direction. Enjoy early employee benefits like stock options, and help shape the future of Bihar.
Team
Build together with a team that has worked with international industry leaders like BYD, Bosch, Cegasa, MIT, or Norman Foster. Learn from leading European research and manufacturing partners.
Location
Live and work in San Sebastian, one of Europe’s most beautiful and innovative cities. Beaches, surfing, and hiking at your doorstep. World-class gastronomy, cultural events, and a thriving innovation ecosystem in the Basque Country, surrounded by research and industry.
How to Apply
Share your background and a short note on why you’re excited to join in the following link.
You will hear back from us soon with the following step of the process, and hopefully with an interview to get to know you better!
We welcome you to apply even if you don’t meet 100% of the criteria. At Bihar, we believe skills can be learned, and we strongly value people willing to grow inside the company.