About the Role
We are seeking a Senior Signal Integrity Engineer to develop, validate, and optimize high-speed signaling solutions across blade- and rack-level architectures for advanced compute platforms. This role sits at the intersection of silicon, package, interconnect, board, and system design, with a strong emphasis on hands-on measurement, simulation correlation, and cross-functional technical communication.
Key Responsibilities
- End-to-end signal integrity analysis for blade- and rack-level system architectures.
- Analyze and optimize high-speed and low-speed I/O interfaces, including PCIe Gen4/5/6, Ethernet, DDR, SerDes, SPI, I2C, etc. and related interconnects.
- Perform time-domain and frequency-domain simulations using tools such as Ansys HFSS, Keysight ADS, Cadence Sigrity, CST, SPICE, or similar.
- Support hands-on lab validation using VNA, TDR, BERT, and high-speed oscilloscopes.
- Correlate simulation results with lab measurements to identify margin gaps, debug issues, and improve design methodology.
- Collaborate with silicon, package, board, connector, cable, and system design teams to optimize I/O channel performance.
- Work with interconnect vendors and ODMs to guide board layout, stack-ups, routing rules, and system design decisions.
- Review schematics, layouts, simulation results, and validation data for blade, backplane, and rack-level hardware.
- Prepare and communicate clear validation reports, measurement summaries, debug findings, and technical recommendations to internal teams, vendors, and senior technical stakeholders.
Required Qualifications
- Bachelor’s or Master’s degree in Electrical Engineering, Computer Engineering, or a related field.
- Strong experience in signal integrity for high-speed digital systems.
- Hands-on measurement expertise using VNAs, TDRs, BERTs, and high-speed oscilloscopes.
- Experience measuring and analyzing S-parameters, impedance profiles, eye diagrams, jitter, timing margins, insertion loss, return loss, and crosstalk.
- Knowledge of high-speed interfaces such as PCIe Gen4/5/6, Ethernet, DDR, SerDes, and related I/O technologies.
- Experience with SI/PI simulation tools such as HFSS, ADS, Sigrity, CST, SPICE, or equivalent.
- Ability to correlate lab measurements with simulations and use data to guide design decisions.
- Strong communication skills, including the ability to produce clear validation reports, present technical findings, and work effectively across multi-functional engineering teams.
Preferred Qualifications
- Experience in hyperscale, data center, cloud infrastructure, or advanced compute hardware environments.
- Experience with blade, backplane, board-to-board, cable, or rack-level interconnect architectures.
- Knowledge of thermal and mechanical considerations that impact SI/PI performance.
- Experience with calibration, de-embedding, fixture design, lab automation, or measurement methodology development.
- Experience using Python, MATLAB, or similar scripting languages for simulation automation, measurement automation, and data analysis.
Tools / Technologies
Measurement: VNA, TDR, BERT, high-speed oscilloscopes
Simulation: Ansys HFSS, Keysight ADS, Cadence Sigrity, CST, SPICE
Interfaces: PCIe Gen4/5/6, Ethernet, DDR, SerDes, SPI, high-speed interconnects
Analysis: S-parameters, eye diagrams, jitter, timing margins, impedance control, crosstalk, insertion loss, return loss, de-embedding, measurement-to-simulation correlation
Why Join Us
This is an opportunity to work on complex, high-performance compute platforms while partnering with experienced technical leaders, ODMs, and interconnect vendors. You will play a key role in defining, measuring, validating, and optimizing next-generation system-level I/O performance.
USA Benefits
In addition to a competitive salary, Graphcore offers flexible working and a comprehensive benefits package designed to support your health, wellbeing and financial future. Our benefits include medical, dental and vision coverage, Flexible Spending Accounts (FSAs), Health Savings Accounts (HSAs), disability and life insurance, a 401(k) retirement plan, commuter benefits, wellness services and an Employee Assistance Programme (EAP). 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.
Skills Required
- Bachelor's or Master's degree in Electrical Engineering, Computer Engineering, or related field
- Strong experience in signal integrity for high-speed digital systems
- Hands-on measurement expertise using VNAs, TDRs, BERTs, and high-speed oscilloscopes
- Experience measuring and analyzing S-parameters, impedance profiles, eye diagrams, jitter, timing margins, insertion loss, return loss, and crosstalk
- Knowledge of high-speed interfaces such as PCIe Gen4/5/6, Ethernet, DDR, SerDes
- Experience with SI/PI simulation tools such as HFSS, ADS, Sigrity, CST, SPICE
- Ability to correlate lab measurements with simulations to guide design decisions
- Strong communication skills and ability to produce clear validation reports and present technical findings
- Experience in hyperscale, data center, cloud infrastructure, or advanced compute hardware environments
- Experience with blade, backplane, board-to-board, cable, or rack-level interconnect architectures
- Knowledge of thermal and mechanical considerations that impact SI/PI performance
- Experience with calibration, de-embedding, fixture design, lab automation, or measurement methodology development
- Experience using Python, MATLAB, or similar scripting languages for simulation and measurement automation and data analysis
What the Team is Saying
Graphcore Compensation & Benefits Highlights
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Healthcare Strength — Health coverage includes medical and dental insurance, with US plans through Cigna and Kaiser, HDHP options with employer‑funded HSA contributions, a health cash plan, EAP access, and dedicated mental‑health support. These provisions extend to family options in some regions, reinforcing broad medical and wellbeing support.
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Retirement Support — Retirement programs include a UK pension match up to 5% and a US 401(k) with a 100% company match up to 6% (with a true‑up). This pairing signals strong, predictable long‑term savings support across key locations.
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Leave & Time Off Breadth — Time‑off policies feature “unlimited” holiday in the UK and flexible, generous PTO with paid US holidays. Paid family leave for birthing parents and bonding further broadens time‑away support.
Graphcore Insights
What We Do
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.
Why Work With Us
Our team is at the forefront of the machine intelligence revolution, enabling innovators from all industries to build AI-native products to expand human potential. What we do at Graphcore really makes a difference.
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Graphcore Offices
Hybrid Workspace
Employees engage in a combination of remote and on-site work.
At Graphcore, we value wellbeing and flexibility to support a healthy work/life balance. Our hybrid approach encourages office-based colleagues to work onsite three days a week, with trusted flexibility built on trust and transparency for everyone.
