Senior R&D Thermal Engineer

Job Description Job Description Senior R&D Thermal Engineer Are you interested in joining a mission-driven, disruptive technology company at the ground floor? Accelsius is revolutionizing data center cooling through advanced direct-to-chip, two-phase cooling technology — solving one of the most pressing thermal and environmental challenges in the rapidly expanding digital infrastructure market. We are seeking a highly motivated and hands-on Senior R&D Thermal Engineer to support the development of next-generation two-phase cooling solutions. This role is ideal for a technically rigorous, innovative engineer who thrives in a fast-paced R&D environment and is excited to translate advanced thermo-fluid science into real-world hardware solutions. This position reports directly to the Principal Engineer and works cross-functionally with engineering, product, and leadership teams to advance Accelsius’ core cooling technologies. While we anticipate this role may be well-suited for an early-career Ph.D. graduate (0–3 years of industry experience), candidates with varying levels of experience will be considered. Role Responsibilities: Design, model, prototype, and test advanced two-phase cooling systems for data center applications Conduct experimental testing and performance validation of thermal-fluid systems Develop analytical and numerical models to support product design and optimization Contribute to invention disclosures and support patent application development Author technical papers, draft research proposals, and present findings at conferences and industry forums Collaborate cross-functionally to transition R&D concepts into scalable product solutions Document experimental results and maintain rigorous engineering records Qualifications for this role include: Ph.D. in Mechanical Engineering, Chemical Engineering, or a related heat transfer/thermo-fluid discipline 0–3 years of relevant industry or postdoctoral experience (additional experience considered) Strong foundation in thermo-fluid sciences, including both modeling and experimental work Hands-on experience building and testing hardware related to two-phase heat transfer systems, such as: Boiling and condensation systems Thermosyphons Heat pipes or vapor chambers Demonstrated ability to translate theory into practical hardware solutions Strong written and verbal communication skills Preferred: Postdoctoral research experience Experience working in startup or fast-paced R&D environments Familiarity with data center thermal management applications Accelsius offers a competitive salary with equity, a full range of benefits including medical and dental, 401K, and unlimited PTO. The position is based in Austin, Texas. This position includes the responsibilities outlined above and may also encompass additional duties as assigned to meet business and compliance needs. Accelsius does not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity or expression, national origin, age, disability, veteran status, marital status, or based on an individual's status in any group or class protected by applicable federal, state or local law. Accelsius encourages applications from minorities, women, the disabled, protected veterans and all other qualified applicants.