About this opportunity
Ericsson is opening a state-of-the-art R&D center in Yokohama to deliver Japan-driven radio products that shape networks worldwide. We are looking for a Senior Thermal Designer to join one of the best Thermal Design teams in the world, developing cutting-edge radio products for 5G and future 6G networks.
In this role, you will deliver competitive thermal solutions under high-volume production and short time-to-market constraints, directly impacting product size, weight, and lifetime. You will collaborate closely with a global community of 30+ talented designers across Sweden, China, and Canada, as well as local vendors and cross-functional engineering teams. If you are eager to learn, grow, and collaborate across disciplines, are you in?
You will
- Collaborate and work with other thermal designers globally, contributing to a creative and supportive team culture
- Conduct Computational Fluid Dynamics (CFD) simulations to support creative development of complex electronic assemblies using state-of-the-art tools
- Validate simulation results through lab testing and prototype evaluations to ensure thermal performance
- Generate clear technical reports, summarizing simulation outcomes, test results, and recommendations, and present numerical and experimental findings to stakeholders across R&D, system, and product management.
- Support troubleshooting and customer cases when thermal issues arise, participating in task forces, RCAs, and design improvements
- Work closely with system, RF, PA, mechanics, materials, power, production, and other functions to secure end-to-end optimized thermal solutions for Ericsson radio products
- Help drive continuous improvement in tools, methods, and processes for thermal simulation and verification, leveraging global best practices and common processes
- Take responsibility for your own development, actively sharing lessons learned and contributing to the global thermal roadmap and technology evolution
You will bring
- M.Sc. or Ph.D. in fluid dynamics, thermal engineering, aerospace, or a closely related field
- 5-10 years of experience in simulations & measurements
- Good scripting skills (e.g. C, MATLAB, Python) to automate workflows, post-processing, and data analysis; experience with AI/ML libraries is a plus
- Good understanding of heat and mass transfer and fluid dynamics principles, and how they apply to electronic cooling from component to product level
- Strong skills in building CFD models with appropriate simplifications that still represent reality, using tools such as FloTherm, Celsius EC, Fluent or equivalent
- General knowledge and interest in the ICT industry is a plus
- Enjoyment of working in cross-functional, international and multi-site teams
- Curiosity and an internal drive to take on new challenges
- Confidence to take fact-based, timely, and courageous decisions without letting prestige get in the way
- Enjoyment of knowledge sharing and contributing to a strong global thermal community, aligning technology strategies and solutions across different sites
- Ability to communicate in spoken and written English; Japanese language skills are an advantage
Why join Ericsson?At Ericsson, you'll have an outstanding opportunity. The chance to use your skills and imagination to push the boundaries of what's possible. To build solutions never seen before to some of the world's toughest problems. You'll be challenged, but you won't be alone. You'll be joining a team of diverse innovators, all driven to go beyond the status quo to craft what comes next.
What happens once you apply? Click Here to find all you need to know about what our typical hiring process looks like.Encouraging a diverse and inclusive organization is core to our values at Ericsson, that's why we champion it in everything we do. We truly believe that by collaborating with people with different experiences we drive innovation, which is essential for our future growth. We encourage people from all backgrounds to apply and realize their full potential as part of our Ericsson team. Ericsson is proud to be an Equal Opportunity Employer. learn more.
Primary country and city: Japan (JP) || Yokohama
Req ID: 785996
Skills Required
- M.Sc. or Ph.D. in fluid dynamics, thermal engineering, aerospace, or a closely related field
- 5-10 years of experience in simulations and measurements
- Good scripting skills (C, MATLAB, Python) for automation, post-processing, and data analysis
- Experience with AI/ML libraries
- Strong understanding of heat and mass transfer and fluid dynamics for electronic cooling
- Experience building CFD models with appropriate simplifications using FloTherm, Celsius EC, Fluent, or equivalent
- Ability to validate simulation results through lab testing and prototype evaluations
- Ability to communicate in spoken and written English
- Japanese language skills
- Experience working in cross-functional, international, multi-site teams
- General knowledge and interest in the ICT industry
What the Team is Saying
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Ericsson Compensation & Benefits Highlights
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Healthcare Strength — Comprehensive medical, dental, vision, and mental‑health options are positioned as core benefits with multiple plan choices in key markets. Official materials explicitly emphasize healthcare breadth as part of “Life at Ericsson.”
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Retirement Support — 401(k) with employer matching in the U.S., pensions in some regions, and broad access to an ESPP indicate strong long‑term financial support. Company filings and AGM materials describe share programs and post‑employment benefits as ongoing pillars of the package.
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Leave & Time Off Breadth — Paid time off, sick leave, holidays, and paid volunteer time are highlighted alongside generous parental leave in various locations. Time‑off entitlements are presented as a strong component of the total rewards offering.
Ericsson Insights
What We Do
Ericsson builds the digital connectivity the world relies on. Our technology underpins the mobile networks, platforms, and systems that billions of people, businesses, and societies depend on every day. We are a global leader in communications technology, delivering mobile network infrastructure, cloud software, and wireless connectivity solutions for service providers and enterprises worldwide. Our networks support connectivity across 180+ countries, helping power everyday communication as well as critical digital services at global scale. Connectivity has evolved far beyond consumer mobile use. Today, nearly 80% of the world’s population accesses the internet via mobile networks, and Ericsson is helping shape what comes next. We are advancing 5G and 5G Advanced, developing network APIs that open connectivity to the global developer ecosystem, and applying automation and AI to make networks more intelligent, efficient, and resilient. Ericsson was the first company to launch live 5G networks on five continents, and our 5G platform is now commercially live in 150+ networks across 60+ countries. We also support more than 36,000 enterprise customers, enabling secure, high-performance connectivity for industries such as manufacturing, aviation, logistics, utilities, and public safety, where reliability and performance are mission critical. Innovation is central to how we work. Ericsson has approximately 28,000 employees in research and development, backed by one of the strongest intellectual property portfolios in the industry with 60,000+ granted patents. Our engineers, researchers, and technologists work across 100+ global R&D sites, helping define how networks evolve and how digital infrastructure is built for the long term. As the world moves toward a mobile-first, AI-powered, and cloud-driven future, connectivity becomes the foundation for digital transformation across every industry. Ericsson is building that foundation, shaping the future of digital connectivity through technology that operates at global scale and supports real-world impact, today and for what comes next.
Why Work With Us
Ericsson is a place for people who want to work on technology that powers everyday life. You’ll contribute to large-scale systems used every day, tackle complex challenges in live environments, and keep developing your skills and career in your own vision.
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