Senior High Speed Electronics Engineer

ZipRecruiter; London; On-site; GBP 135,000 - 165,000; Full time

Job summary

A leading company in AI technology is seeking a Senior High-Speed Electronics Engineer in London. You will play a critical role in designing, validating, and optimizing the electrical subsystems for their Optical Tensor Processing Units. This position offers a competitive salary and stock options in a fast-paced environment focused on innovation.

Benefits

Stock options

Comprehensive healthcare insurance

25 days PTO plus bank holidays

Private access to in-house 3D printer

Qualifications

• 7+ years of experience in high-speed digital electronics design.
• Experience with PCIe, DDR4/5, and SERDES interfaces.
• Strong understanding and hands-on experience with silicon bring-up and validation.

Responsibilities

• Design and develop high-speed electronic circuits.
• Conduct silicon validation and automated hardware testing.
• Collaborate with multidisciplinary teams for system integration.

Skills

High-speed digital electronics design

Signal integrity (SI)

Power integrity (PI)

Automated test environments

PCB design and layout

Embedded system architectures

Problem-solving

Education

Bachelor's degree in Electrical Engineering

Master's or PhD in related field

Job description

Job Description

Company Overview

Flux Computing designs and manufactures optical processors to train and run inference on large AI models. Join us in London to be part of a highly motivated and skilled team that thrives on delivering impact and innovation at speed.

The role

We are seeking an experienced and driven Senior High Speed Electronics Engineer to play a key role in the development, validation, and optimisation of the high-speed electrical subsystems that power Flux’s Optical Tensor Processing Units (OTPUs). This position requires deep expertise in high-speed digital and analog design, signal integrity, and system-level validation. You will be instrumental in ensuring performance, reliability, and scalability from prototype to production, including the validation of silicon devices and development of automated test infrastructure. Collaborating with multidisciplinary teams, you will help bridge the gap between silicon, board-level hardware, and full system integration.

Responsibilities

• Design and develop high-speed electronic circuits including SERDES interfaces, clocking networks, and memory interconnects (e.g., PCIe, DDR4/5, Ethernet).
• Conduct comprehensive silicon validation, including bring-up of custom ASICs and validation of electrical interfaces under real-world conditions.
• Develop and deploy automated hardware test setups for board-level and silicon validation, integrating scripting and measurement tools (e.g., Python, LabVIEW, or similar).
• Lead signal integrity and power integrity analysis, including simulation and measurement (e.g., eye diagrams, S-parameters, crosstalk analysis).
• Collaborate with IC design and layout teams to define I/O requirements, package constraints, and test strategies during chip development.
• Create high-speed PCB designs and review layouts for impedance control, routing constraints, and noise mitigation.
• Work closely with FPGA and embedded software teams to support interface validation and debugging at the system level.
• Drive root cause analysis for signal failures, timing errors, and system-level integration issues using advanced lab instrumentation (oscilloscopes, logic analysers, BERTs, VNAs).
• Contribute to test plan development, validation coverage analysis, and reporting for product verification and manufacturing readiness.
• Document technical designs, validation results, and bring-up procedures for internal stakeholders and product teams.

Skills & Experience

• 7+ years of experience in high-speed digital electronics design, including interfaces such as PCIe, DDR4/5, Ethernet, and SERDES.
• Strong understanding of signal integrity (SI) and power integrity (PI) principles, including simulation and analysis using tools like HyperLynx, ADS, or Sigrity.
• Proven experience with silicon bring-up and validation, including hands-on work with custom ASICs, FPGAs, or SoCs.
• Proficiency in developing automated test environments for hardware validation using scripting (e.g., Python, MATLAB) and lab tools integration.
• Experience with PCB design and layout for high-speed digital systems, including impedance control, differential pair routing, and minimising crosstalk.
• Deep understanding of embedded system architectures.
• Extensive experience in synchronising complex hardware components and optimising real-time system performance.
• Strong problem-solving skills and the ability to debug hardware-software interactions effectively.
• Bachelor’s degree in Electrical Engineering, Electronics Engineering, or a related field; Master’s or PhD .
• Ability to thrive in a fast-paced, dynamic environment and collaborate effectively with multidisciplinary teams.

Compensation & Benefits

• Competitive salary ranging from £135,000-£165,000, depending on experience.
• Stock options in a rapidly growing AI company.
• Based in our new 5,000 sq. ft. office in the AI hub of Kings Cross, London.
• To foster collaboration in our high-growth environment, we require all employees to work from our London HQ and live within a 45-minute commute. We offer an extra £24,000/year incentive for those living within 20 minutes.
• Comprehensive healthcare insurance.
• 25 days PTO policy plus bank holidays.
• Private access to our in-house 3D printer.

If you are passionate about pushing the boundaries of what's possible in AI and thrive in a high-energy, fast-paced environment, we want to hear from you. Apply now to join Flux and be a key player in shaping the future of computing.