Senior Signal Integrity Engineer
Graphcore is a Bristol-based AI chipmaker (IPU accelerators), a SoftBank subsidiary and a Molten Ventures portfolio company.
Maintainer signals as of 8/20/2026
About Graphcore
Graphcore (graphcore.ai) is a British semiconductor company building Intelligence Processing Units (IPUs) for AI workloads. Founded in Bristol in 2016, it was acquired by SoftBank in 2024. It is a portfolio company of Molten Ventures.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
About the Role
You will develop, validate, and optimise high-speed signalling across blade- and rack-level architectures. You will analyse interfaces, run simulations, perform laboratory measurements, correlate simulations with results, debug margin issues, review hardware designs, guide vendors and ODMs, and communicate validation findings and recommendations.
Requirements
- 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 analysing S-parameters, impedance profiles, eye diagrams, jitter, timing margins, insertion loss, return loss, and crosstalk
- Knowledge of PCIe Gen4/5/6, Ethernet, DDR, SerDes, and related interfaces
- Experience with HFSS, ADS, Sigrity, CST, SPICE, or equivalent simulation tools
- Ability to correlate laboratory measurements with simulations
- Strong technical communication skills
Responsibilities
- Analyse signal integrity for blade- and rack-level architectures
- Analyse and optimise high-speed and low-speed I/O interfaces
- Perform time-domain and frequency-domain simulations
- Validate designs using VNAs, TDRs, BERTs, and high-speed oscilloscopes
- Correlate simulations with laboratory measurements
- Identify margin gaps and debug issues
- Review schematics, layouts, simulations, and validation data
- Guide board layout, stack-ups, routing rules, and system design decisions
- Prepare validation reports and technical recommendations
Benefits
- Flexible working
- Medical coverage
- Dental coverage
- Vision coverage
- Flexible Spending Accounts
- Health Savings Accounts
- Disability insurance
- Life insurance
- 401(k) retirement plan
- Commuter benefits
- Wellness services
- Employee Assistance Programme