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ZG - Savska Opatovina, HRV

Battery Performance Engineer


About us

We are a technology powerhouse that designs, engineers, and manufactures the world's most advanced products, from hypercars to grid storage solutions. Bytes to bolts, Rimac is where everything happens.


At Rimac Technology, we are on a mission to accelerate the pace of decarbonization across various industries through our cutting-edge electrification solutions. By launching Rimac Energy and introducing next-generation stationary Energy Storage Systems (ESS). we are at the front line of this effort with the aim of facilitating the transition towards a more sustainable planet.


Join Rimac Energy and work with a global team that is passionate for solving complex problems, pushing boundaries, and challenging the status quo. You can make a real impact to our business and push your career to the next level; together we can change the way we power the planet for good.


At Rimac Energy we are currently seeking an experienced  battery performance engineer to join our team. In this role, you will play a crucial part in achieving our objective to create tangible social and environmental impact. As a battery performance engineer, you will work closely with a team of multi-disciplinary experts to design and develop battery systems with greater performance, optimized lifetime, and enhanced safety. 




  • Cell Definition – Work with internal teams, and cell suppliers to choose the ideal cell for each program, ensuring the right balance of performance attributes, cost and risk are provided.    
  • Develop and execute battery safety and performance test plans, including design of experiments, test equipment selection and setup, and data acquisition.
  • Greater Performance Extraction – Utilise models and experimentation to maximise the available energy, power, and charge capability without compromising safety and/or reliability. Assist with degradation assessments and work to optimise lifetime
  • Performance Prediction - Utilise models and experimentation to provide key inputs about cell performance, heat generation and degradation to other team members.
  • Safety – Work with internal teams to ensure that key safety metrics are satisfied.
  • Validation & Verification - Work with internal teams to ensure appropriate levels of validation and verification and conducted to demonstrate that the system level requirements can be met
  • Develop and maintain test equipment, including design, procurement, and calibration.
  • Develop advanced battery cell/module/pack model and control algorithms to improve and estimate battery performance   
  • Represent the company as a technical expert for ongoing project delivery and engage with stakeholders at all levels of the organization. 




  • An engineering qualification (Bachelor’s or master’s degree in a STEM subject or equivalent) and relevant industry/academic experience. 
  • Knowledge on battery technologies
  • Strong experience with battery safety and performance testing equipment and data acquisition systems.
  • Proficiency in data analysis tools, such as Matlab, Python
  • Experience in developing electrochemical and/or thermal models for batteries.
  • Strong communication skills and ability to work collaboratively with cross-functional teams.
  • Knowledge of battery safety standards and regulations. 


What we are like and what we offer


  • Working on exciting projects in a high-performance environment pushing the limits, moving science forward while working with the global automotive manufacturers on developing the latest automotive technology.
  • Stock options – as a Rimac employee, you will have the opportunity to participate in our company's success through stock options. By becoming an owner of Rimac options (shares), you can actively contribute to the growth and value of the company. Let's embark on this journey together and enjoy the benefits of shared success at Rimac.
  • Flexible working hours – align with your manager and work on your own schedule.
  • Educational budget and internal education programs – at Rimac, we believe in the importance of continuous learning. We provide a range of educational programs and opportunities to support your growth, and we actively encourage you to expand your knowledge and skills. Embrace the chance to learn more and never stop your pursuit of knowledge at Rimac.
  • Transportation support we provide support by covering the costs of local public transportation. Rest assured, we've got you covered when it comes to commuting, ensuring your ease and convenience as a valued member of our team.
  • Health-related benefits – taking care of your physical wellbeing is of great importance and all our team members have additional and supplementary health insurance coverage, with an additional budget for yearly general physical examinations and multiple discounts in various privately held clinics.
  • Multisport card – being a Rimac employee and a valued team member makes you eligible for Multisport membership with discounted prices for enjoying various sport activities or fitness programs in sporting venues all over Croatia.
  • Psychological counseling – physical and mental wellbeing are our priorities when thinking about our most valuable asset – people. Prioritizing mental health for overall well-being covered by the company is one of the most important steps in having a productive and satisfied community.
  • Family-oriented perks – we pride ourselves in being a family friendly environment and raising the new generation of STEM oriented brainiacs, so small gestures of love for your loved ones with kindergarten support and various kids’ activities are what we’re all about.  
  • Pet-friendly workplace – we are always on the lookout for new Pawject Managers! You’ll be able to bring your pet to work, receive a pet necklace and have a professional photoshoot of your pet for its ID card (and lots of discounts for pet shops and clinics).
  • Relaxation zones, fresh fruits, and healthy snacks – recharge your batteries with daily fresh fruits and vegetables delivered to your workplace from Croatia’s family-owned business.
  • Shopping, travel, and entertainment discounts – as a growing company, we try to negotiate the best conditions and all for your own convenience. Each year we grow our network of partners so you can experience new things and save money.
  • Possibility of remote work – even though we love teamwork and try to be more connected to further strengthen our bond between departments and team members, we do want you to feel as comfortable as possible. So, if you want to work in your PJ’s while staying connected, be free do to so when it suits you the most.