Electronic Engineer (Embedded Systems) @ Bihar BatteriesSan Sebastian (Basque Country, Spain) | Hybrid (Remote/In-Person)Start Date: May/June 2026Full-time | Permanent5-7 years of experience | Competitive Salary + Phantom SharesAbout UsYou'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 areBihar Batteries, a new-generation battery startup based in San Sebastian. We are buildingsodium-ion storage systems, a critical technology that gives people, businesses, and communities control over theirenergy .Unlike lithium-ion, our sodium-ion technology is made withlocally abundant raw materials like salt. This means no critical supply chains, and a hopeful path towardsenergy independence in Europe.This technology is at the heart of our product: amodular battery systemthat 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 aworking sodium battery prototypeandour proprietary sodium cells .We have partnered withleading industrial companies and research centersto scale up, such as CIC energiGUNE and Battera.We are backed by renowned Europeaninvestorsand have receivedsignificant public supportto support our operations.We believe batteries should not only be reliable, but alsowell-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 ForWe are looking for anElectronic Engineerto lead thecontrol electronicsof our battery system. This involves integrating components of commercially availableBattery Management Systems and Energy Management Systemsinto our product, as well asdeveloping new electronic componentsfor our system.We are looking for acurious 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 isyour product,and to be part of the company's growth from a small group of individuals to an organization with international ambition.What we NeedDegree inElectronic Engineering, preferably with a Master's inEmbedded Systems .Deep understanding ofBattery Management Systems (BMS)andEnergy Management Systems (EMS), with an ability to assess, test, integrate and modify them, includinguC 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 developPCBs from scratch, including designing, prototyping, testing, and iterating (KiCad, schemes, Gerbers, BOM).Understand the functioning ofpower electronic battery components(DC/DC, DC/AC, AC/DC) and being able to integrate and work with them.Ability to work fluently inSpanish and English .Based inSan Sebastianor willingness to spend significant time in the city (hybrid position).️What You'll Be Working OnIntegrating commercialBMS and EMScomponents into Bihar's modular sodium-ion stationary storage system.Designing, prototyping, and coordinatingthe development ofnew control electronic components, especially for BMS and EMS's .Developing the necessaryfirmware/softwarefor BMS and EMS components.Integratingcontrol electronic componentswithpower electronic componentswith a sense of product.Assisting inproduct developmentandcertification processes, such as Electromagnetic Compatibility (EMC) .Interacting withR&D,product designandmanufacturingteams to scale electronics, as well as clients.Managing relationships withsuppliersand product manufacturers.Assisting withproduct management and certification .Hiring and mentoring new teammates as we grow.What We OfferHybrid work flexibility, with the chance to combine remote focus time and in-person prototyping in our San Sebastian workspace.Acompetitive salaryadapted to your experience, plus phantom shares.Brand new equipmentboth to design as well as to prototype (you choose).️ Acareer plantailored to your experience and ambition.Training & education budget(courses, books, travel to events).Referral bonusfor bringing in great people to the team. Anannual company offsitewith the team to enjoy, talk and discuss company strategy.Why Join Us?PurposeWork 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.OwnershipSince 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.TeamBuild 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.LocationLive 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 ApplyShare your background and a short note on why you're excited to join in the followinglink.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.