Materials Engineer Jobs in Bristol.
All active Materials Engineer roles based in Bristol.
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Fractile is building silicon, systems and software which will redefine the frontier of AI: running the world’s most advanced models at radically higher speed and lower cost. We have an exceptional team across hardware and software capable of bringing about this change, and we are growing fast to meet demand and deliver our product at scale.
We’re looking for an engineer to develop and deliver production-ready manufacturing test solutions for an advanced AI accelerator chip. This role is a hands-on individual contributor position focused on ATE test program development, silicon bring-up, debug, and optimization across digital logic, memory, and high-speed interfaces. Work under the direction of the Semiconductor Test Engineering Lead and collaborate closely with design, DFT, product engineering, and external test partners.
Key Responsibilities
- Develop and maintain ATE test programs for an AI accelerator chip targeting high-volume manufacturing.
- Implement manufacturing test content for advanced CMOS designs including high-speed logic, SRAM, DRAM, and high speed IO blocks.
- Develop and debug structural and functional test content such as scan/ATPG, LBIST, MBIST, JTAG, and HSIO tests.
- Bring up first silicon on ATE, including pattern debug, tester correlation, shmooing, and corner analysis.
- Support testing of high-speed interfaces such as PCIe Gen6 and multi-GHz LPDDR, including at-speed tests and margining features.
- Execute silicon characterization and failure analysis to identify yield limiters and defect mechanisms.
- Optimize test coverage, test time, and cost while maintaining manufacturing robustness.
- Work with DFT and design teams to improve testability and close coverage gaps.
- Collaborate with OSATs and external partners on test program execution and debug under guidance from the test lead.
- Support advanced packaging test flows, including die-to-die interconnect testing and package-level thermal considerations.
- Contribute to documentation of test programs, debug procedures, and manufacturing release materials.
- Support qualification, reliability testing, and high-volume manufacturing ramp.
Required Qualifications
- 5+ years of hands-on semiconductor test engineering experience.
- Strong experience developing ATE test programs (Advantest 93K, Teradyne, or equivalent).
- Solid understanding of DFT methodologies (scan, ATPG, MBIST, LBIST) and memory test techniques.
- Experience debugging silicon issues at the tester and correlating failures to design or process causes.
- Familiarity with advanced CMOS nodes and production test challenges.
- Ability to work effectively in a cross-functional engineering environment.
Preferred Qualifications
- Experience testing AI accelerators, GPUs, networking ASICs, or other high-performance compute ICs.
- Experience with PCIe Gen5/Gen6, LPDDR4/5/6, or other high-speed interfaces.
- Exposure to advanced packaging, chiplets, or multi-die test flows.
- Experience improving yield, reducing test time, or optimizing cost in high-volume manufacturing.
How we work
- Ownership and execution: you will have full agency to drive your work forward
- Rapid iteration: we all work directly with top leadership to move from idea to hardware on ambitious timelines
- Full-stack engagement: hardware, software, silicon, and modelling teams all work closely together to create a product with generational impact
- Optimistic and pragmatic: we possess the will to win, and to do the hard work to get us there
- Team player mentality: the mission is bigger than any of us, and we have the curiosity and technical focus to see the best idea shipped, no matter who’s it is
About us
- Founded in 2022, team of 70+ which is expanding rapidly
- Modern, open offices in London and Bristol
- Collaborative, problem-solving culture built on deep curiosity, entrepreneurial initiative and technical fluency
Export control and security clearance
Certain roles may involve working on technologies subject to export restrictions. Applicants may be required to undergo additional eligibility checks to ensure compliance with applicable law.
Ready to apply?
Apply to Fractile
Fractile is building silicon, systems and software which will redefine the frontier of AI: running the world’s most advanced models at radically higher speed and lower cost. We have an exceptional team across hardware and software capable of bringing about this change, and we are growing fast to meet demand and deliver our product at scale.
We are seeking a Thermal Engineer with deep experience in data centre or high-density system design, someone who can guide and shape the development of advanced cooling architectures. You might be a mechanical engineer who has specialised in thermal design, or a thermal systems expert with strong modelling and integration experience. Either way, you’ll be comfortable leading design direction and working hands-on with suppliers, prototypes, and test rigs. We are open to a contractor or permanent hires, we are most interested in finding someone who can add real expertise when it’s needed, help define the right path, and guide the build of a robust, production-ready cooling solution.
The Role
You will lead the design of an advanced cooling system for a high-density AI accelerator system destined for data centre deployment. This includes developing the full cooling architecture — from Direct-to-Chip (D2C) liquid cooling through to rack-level thermal management and hybrid liquid-air solutions for host chassis. You’ll collaborate closely with mechanical engineers (internal and external), chip and board designers, and 3rd-party suppliers to define requirements, review designs, and ensure that every aspect of the system — from the cold plate up — meets performance, reliability, and manufacturability goals. We expect you to bring a mix of technical authority, practical design sense, and strong supplier management skills. You may also lead or advise on the development of a thermal test platform to validate solutions in real-world conditions.
Key Responsibilities
- Lead the design and specification of an advanced cooling solution for dense AI hardware systems
- Work closely with 3rd-party suppliers to define thermal and mechanical requirements and review proposed solutions
- Contribute to mechanical system design — specifying chassis interfaces, manifold routing, fittings, and integration details
- Model and simulate thermal performance at cold plate, chassis, and rack levels
- Develop and/or oversee a test platform to validate cooling concepts and final implementation
- Support the design of Direct-to-Chip (D2C) liquid cooling systems, Cold Plates, CDUs, and Hybrid Liquid-Air chassis
- Drive design reviews, evaluate trade-offs, and ensure solutions are manufacturable and reliable
- Liaise with system, hardware, and data centre teams to ensure the cooling architecture integrates seamlessly into overall system design
Skills & Experience
Essential
- Bachelor's Degree in Mechanical Engineering
- At least 7 years of experience in developing hardware products with thermal design liquid cooling systems for high-performance computing, data centres, or equivalent high-density hardware
- Expertise with D2C liquid cooling, cold plate design, and CDU/rack-level systems
- Hands-on experience with thermal modelling and simulation tools
- Experience taking designs through prototyping, test, and production
- Strong collaboration skills — comfortable working across disciplines and with suppliers
- Familiarity with thermal-fluid analysis, materials selection, and system reliability principles
Desirable
- Experience with AI accelerator or HPC hardware
- Background in mechanical engineering — able to support mechanical chassis design and integration
- Experience working directly with data centre operators or hyperscale infrastructure teams
- Awareness of liquid handling and serviceability considerations in deployed environments
- UK-based, or able to work UK hours with occasional on-site collaboration
How we work
- Ownership and execution: you will have full agency to drive your work forward
- Rapid iteration: we all work directly with top leadership to move from idea to hardware on ambitious timelines
- Full-stack engagement: hardware, software, silicon, and modelling teams all work closely together to create a product with generational impact
- Optimistic and pragmatic: we possess the will to win, and to do the hard work to get us there
- Team player mentality: the mission is bigger than any of us, and we have the curiosity and technical focus to see the best idea shipped, no matter who’s it is
About us
- Founded in 2022, team of 70+ which is expanding rapidly
- Modern, open offices in London and Bristol
- Collaborative, problem-solving culture built on deep curiosity, entrepreneurial initiative and technical fluency
Export control and security clearance
Certain roles may involve working on technologies subject to export restrictions. Applicants may be required to undergo additional eligibility checks to ensure compliance with applicable law.
Ready to apply?
Apply to Fractile
Senior Semiconductor Reliability Engineer – Advanced Silicon & Packaging
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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.
Applicants for this position must hold the right to work in the UK. Unfortunately at this time, we are unable to provide visa sponsorship or support for visa applications
Ready to apply?
Apply to Graphcore
Signal Integrity Engineer
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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
As a hardware signal integrity engineer you will develop, extract and simulate PCB structures to ensure that the high speed SERDES (112Gbps) and DDR interfaces perform correctly within the system budget.
You will work closely with the PCB and package substrate CAD engineers to design component signal launches from BGA components and connectors, layer transition via structures, and cable interconnect. You will define the low-loss materials to be used for future designs and work closely with Graphcore’s system architecture team and suppliers to ensure the best possible performance is achieved. You will be an expert user of high-speed PCB simulation tools and be familiar with industry best practice in high-speed digital system design.
The Team
Graphcore’s Hardware Engineering Team creates both products for sale in volume production and hardware test & validation systems based on Graphcore’s IPU processor.
These systems allow Graphcore’s customers to develop leading-edge machine-leaning solutions for training and inference.
Responsibilities and Duties
Signal and Power Integrity specialist for the development of production systems and test boards for Graphcore’s family of processors.
Includes:
- Development of printed circuit board structures for high frequency (112Gbps, 16Gbps) SERDES interfaces, DDR interfaces
- PCB stackup definition
- System, PCB and substrate level simulation and analysis of signal and power integrity
- Graphcore Integrated Circuit device interface requirements definition, tool & vendor relationships
- PCB design requirement and constraint definition, PCB layout supervision
- Prototype bring-up, evaluation, validation & system test
Candidate Profile
- 5+ years’ experience in high-speed digital circuit development, with a deep understanding of signal and power supply integrity
- Knowledge of high-speed circuit design requirements to ensure signal integrity and robust rejection of interference and crosstalk is essential
- Experience of high frequency (tens of GHz) SERDES design and validation
- Experience with ANSYS SIWave, HFSS, and/or Mentor Hyperlynx Signal and Power Integrity tools
- High speed processor system design with experience in interfaces such as SERDES, PCI, DDR, Ethernet, etc.
- Design of BGA & connector pad launches, via structures and transmission lines for GHz signals.
- This position will require extensive practical work in the lab, bringing up, debugging and validating designs
- Expertise in the use of vector network analysers, high speed digital oscilloscopes, signal generators
- A rigorous approach is required to make sure designs will work correctly the first time
- Independent working and the taking of responsibility, with excellent cooperative and communications skills to work in a small team environment
- Experience working in a small team, which requires a wide range of skills, an eagerness to participate in all parts of the development cycle from concept to testing in the lab and supporting manufacture and customers.
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.
Ready to apply?
Apply to Graphcore