Advanced Thermal Modelling Engineer

Graphcore

ABOUT GRAPHCORE At Graphcore, we’re building the future of AI compute. We’re a team of semiconductor, software and AI experts, with deep experience in creating the complete AI compute stack - from silicon and software to infrastructure at datacenter scale. As part of the SoftBank Group, backed by significant long-term investment, we are delivering key technology into the fast-growing SoftBank AI ecosystem.To meet the vast and exciting AI opportunity, Graphcore is expanding its teams around the world. We are bringing together the brightest minds to solve the toughest problems, in a place where everyone has the opportunity to make an impact on the company, our products and the future of artificial intelligence. JOB SUMMARY We are seeking a Senior Semiconductor Reliability Engineer to lead reliability strategy and execution across advanced silicon nodes and advanced packaging technologies, spanning both pre-silicon and post-silicon phases. This role is responsible for ensuring robust product reliability from technology selection and design enablement through silicon bring-up, qualification, and high-volume manufacturing. The successful candidate will work at the intersection of device physics, circuit design, packaging, and manufacturing, providing technical leadership on reliability risk assessment, modeling, qualification, and failure analysis for complex, high-performance devices. THE ROLE As a Senior Reliability Engineer, you will lead reliability strategy and qualification activities for advanced AI silicon and package technologies. You’ll work across pre-silicon analysis, post-silicon qualification, and failure analysis, partnering closely with silicon, packaging, manufacturing, and quality teams. This role combines deep technical expertise with cross-functional leadership and offers the opportunity to influence reliability methodology for cutting-edge AI hardware platforms. ---------------------------------------------------------------------------------------------------------------------------------- RESPONSIBILITIES AND DUTIES * Define reliability requirements for advanced silicon nodes and package platforms * Perform pre-silicon reliability risk assessments across silicon, interconnect, and package technologies * Evaluate reliability mechanisms including EM, TDDB, BTI, HCI, BEOL, and silicon-package interaction * Support design reviews, guard-banding, and reliability sign-off activities * Develop and execute qualification plans aligned with JEDEC and customer requirements * Lead HTOL, thermal cycling, thermal shock, and reflow qualification testing * Drive correlation between pre-silicon modelling and post-silicon qualification results * Lead root-cause analysis of silicon and package-related failures * Utilize X-ray and CSAM analysis to diagnose package defects including delamination, voiding, and cracking * Work with foundries, OSATs, and reliability labs to resolve reliability and manufacturing issues * Author qualification reports, risk assessments, and reliability documentation * Mentor engineers and contribute to reliability best practices and methodologies ---------------------------------------------------------------------------------------------------------------------------------- CANDIDATE PROFILE ESSENTIAL * Bachelor’s or Master’s degree in Electrical Engineering, Materials Science, Physics, Mechanical Engineering, or related field * 8+ years of semiconductor reliability engineering experience * Strong understanding of silicon reliability mechanisms including EM, TDDB, BTI, and HCI * Experience with BEOL, interconnect, and advanced package reliability * Hands-on experience with HTOL, thermal cycling, thermal shock, and reflow testing * Experience using X-ray and CSAM for package failure analysis * Familiarity with JEDEC reliability standards * Strong analytical, communication, and cross-functional collaboration skills DESIRABLE * Experience with leading-edge nodes, AI accelerators, or high-performance SoCs * Knowledge of HBM, chiplets, TSVs, micro-bumps, and 2.5D/3D integration * Experience with wafer-level reliability or system-level stress testing * Experience working with foundries and OSAT partners * Technical leadership or mentoring experience ---------------------------------------------------------------------------------------------------------------------------------- BENEFITS In addition to a competitive salary, Graphcore offers flexible working, a generous annual leave policy, private medical insurance and health cash plan, a dental plan, pension (matched up to 5%), life assurance and income protection. We have a generous parental leave policy and an employee assistance programme (which includes health, mental wellbeing, and bereavement support). We offer a range of healthy food and snacks at our central Bristol office and have our own barista bar! We welcome people of different backgrounds and experiences; we’re committed to building an inclusive work environment that makes Graphcore a great home for everyone. We offer an equal opportunity process and understand that there are visible and invisible differences in all of us. We can provide a flexible approach to interview and encourage you to chat to us if you require any reasonable adjustments. We are able to provide visa sponsorship or support for visa applications

Vertical Aerospace

Our Mission At Vertical Aerospace, we are pioneering the way for electric aviation. The Valo, our eVTOL (electric, vertical, take-off and landing), 'zero emissions' aircraft will set a new safety standard for how we will navigate the sky. We won't realise our mission following the same legacy processes and traditions our predecessors followed, instead, we want to 'redefine' aerospace best practices. We are growing quickly from a prototype business to a scaling SME, and the next few years will be critical to our success and delivering on our ambitious goals. Valo is targeting airliner-level safety certification in 2029 ahead of entering service with our airline and operator customers. WHAT TO EXPECT As an Senior Cell Engineer, you'll play a key role in qualifying commercial lithium-ion cells for use in our next-generation electric aircraft. Working closely with engineers, technicians, suppliers and research partners, you'll generate the evidence needed to support safe, high-performance battery systems. WHAT YOU'LL DO * Developing qualification methods for commercial lithium-ion cells, covering electrochemistry, electrical testing and data analysis. * Designing test plans, communicating test requirements to engineers and technicians, and analysing and reporting results. * Developing and optimising data analysis tools for electrical, safety and materials test data, including statistical analysis. * Working with industrial and academic partners to plan and deliver cell testing and analysis activities. * Generating and managing cell requirements and supporting associated verification and validation activities through testing, modelling and analysis. * Supporting system-level requirement verification across the battery programme. * Supporting the management of cell suppliers and contributing to our cell sourcing strategy. * Contributing across the wider electrochemistry team, supporting performance, lifetime, safety, quality and future cell technology evaluation. WHAT YOU'LL BRING ESSENTIAL * Degree, MSc or PhD (or equivalent experience) in Electrochemistry, Chemical Engineering, Materials Science or a related discipline. * Strong understanding of lithium-ion cell electrochemistry, cell performance, degradation mechanisms and design trade-offs. * 1-2 years' experience working with commercial lithium-ion cells. * Experience designing and analysing lithium-ion electrical test programmes, including Design of Experiments (DoE). * Strong experience analysing lithium-ion cell data. * Good understanding of how lithium-ion cells integrate into larger battery systems. * Ability to work independently while collaborating effectively across multidisciplinary engineering teams. * Comfortable working in a fast-paced, evolving environment with changing priorities. * Strong analytical and problem-solving skills with a proactive, hands-on approach. DESIRABLE * Experience with requirements management or systems engineering (e.g. FMEA, FTA). * Familiarity with equivalent circuit models (ECM), thermal equivalent circuit models (TECM) or empirical lifetime modelling. * Experience qualifying lithium-ion cells for industrial applications such as electric vehicles or aerospace. * Experience handling large datasets and developing data analysis pipelines. * Hands-on experience with electrical cell testing, materials characterisation or cell forensic analysis. * Experience working with large-scale cell suppliers. * Aerospace industry experience. What can you expect from us? We're on a mission. Where others see limits, we see opportunity, and we work at pace. Working at Vertical isn't your average role but for those seeking a challenge, a flexible, supportive organisation and an incredible team; working here is an opportunity to do the best work of your career. Our approach promotes ingenuity and courage, while our environment builds success through diligence in safety and being open in the way we work. The only way we're going to assure the next chapter of aviation history is by working as a team, relentlessly, towards our goal.  Our benefits Our people matter - we're not going anywhere without them. Which is why our company benefits go beyond the essentials. * 26 days holiday, plus bank holiday * 5 extra days per year to buy (or sell) * 5 extra days holiday when you get married or enter a civil partnership * Additional 4% of your salary to spend on extra benefits * Award-winning digital health and wellbeing service (Help@Hand) * Company performance based bonus - rewarding company and individual performance * Company Share Scheme - open to every Vertical employee * Company Pension Scheme - 5% and we match it * Breakfast on us, every day We may just be the hardest job you've ever had, but we're confident it will be the most rewarding. Join the team today and help us shape the future of Advanced Air Mobility. Disclaimer Statement We encourage you to apply even if you may not have all the experience listed in the advert. We recognise that talent comes in various forms and we are committed to providing opportunities that create an environment of growth, diversity, and inclusion for everyone. As part of our desire to review and make our processes fair, we may ask you questions related to these aspects during the application process. For more information on how we will use your data, see our Legal section.

Graphcore

ABOUT THE JOB Help bring the next generation of AI hardware from design into high volume manufacturing. You'll lead the industrialisation of advanced thermal cooling solutions for AI compute processors and accelerator systems. Your work will ensure designs can be built reliably, validated efficiently, and scaled for production. You'll shape manufacturing processes for cold plates, thermal interface materials, and mechanical assemblies. You'll work closely with design teams, manufacturing partners, and specialist suppliers to solve complex engineering challenges. This role offers broad technical ownership and the opportunity to influence products from development through to manufacturing deployment across a global supply chain. THE TEAM AND CULTURE You'll join the Manufacturing Technology team within Manufacturing Operations. The team works across Bristol, Cambridge, India, Taiwan, and the US to develop robust manufacturing processes for advanced hardware. Day to day, you'll work closely with engineering, operations, quality teams, and manufacturing partners. Decisions are driven by technical evidence, testing, and continuous improvement. You'll take ownership of manufacturing readiness, solve issues during build cycles, and help improve quality, yield, and production capability. WHAT WE'RE LOOKING FOR ESSENTIAL:  * Strong experience in thermal, mechanical and/or manufacturing engineering  * Experience bringing complex electromechanical products from development into high-volume production.  * Strong understanding of thermal management technologies for high-power electronics, including:  * Liquid cooling systems, cold plates and vapour chambers  * Heat sinks and heat spreaders  * Thermal interface materials (TIMs)  * Mechanical retention and mounting systems  * Solid understanding of thermal management principles (heat transfer, cooling solutions, TIMs, etc.)  * Experience with DFM (Design for Manufacture), manufacturing processes, assembly, and tolerancing  * Master’s degree in Mechanical Engineering, Thermal Engineering, Manufacturing or a related discipline  DESIRABLE:  * Experience with thermal and/or mechanical simulation tools (CFD / FEA)  * Knowledge of PCB design and manufacturing technology  * Knowledge of qualification and reliability testing of mechanical and thermal assemblies  BENEFITS * Unlimited annual leave * Up to 5% matched pension * Phantom equity – share in Graphcore's success * True flexibility in how and where you work * Office spaces designed for collaboration * Free food and an on-site barista * Health cash plan * Income protection * Life assurance * Along with other benefits you can choose from (private medical insurance, dental plan etc) We welcome people from all backgrounds and experiences and are committed to building an inclusive environment where everyone can do their best work. We're an equal opportunity employer and recognise that everyone brings different strengths and perspectives. If you need any adjustments during the interview process, just let us know. We're happy to support you. JOIN THE TEAM AT GRAPHCORE Graphcore is building the compute platform for the next generation of artificial intelligence. From advanced silicon to intelligent software, our technology is designed to unlock breakthroughs in AI and bring its benefits to every industry. As part of the SoftBank Group, we're backed by one of the world's most ambitious technology investors, working alongside companies shaping the future of AI. Together, we share a bold goal: to help enable artificial superintelligence and ensure it delivers meaningful impact at a global scale. At Graphcore, you'll work with people who are pushing the boundaries of what's possible. Our teams bring together AI researchers, chip designers, software engineers and systems experts from a wide range of backgrounds. It's an environment where we take on big challenges with curiosity and focus, move quickly and decisively, take real ownership of our work, and speak up to challenge ideas, stepping up to support each other and lead through action. If you want to help bring advanced AI hardware into production at scale, we'd love to hear from you. Apply now to join Graphcore.