Senior Optical Application Engineer

Credo; San Jose (CA); On-site; USD 100,000 - 170,000; Full time

Benefits offered by this job

Discretionary bonus

Equity

Medical benefits

Full benefits

Job summary

Credo in San Jose is hiring a High Speed Transceiver Application Engineer to validate 400G/800G/1.6T modules, perform electrical validation, automation development, and system-level debugging with hardware, firmware, and manufacturing teams.

The role emphasizes hands-on lab work, strong SerDes and signal integrity knowledge, and independent collaboration in a fast-paced environment, with opportunities for growth and impact.

Qualifications

• Master's or higher degree in Electrical Engineering, Communications Engineering, Physics, or a related field.
• Hands-on experience with high-speed transceivers such as QSFP-DD, OSFP, and AEC, and related lab instruments (e.g., oscilloscope, BERT, and VNA).
• Strong SerDes, signal integrity, and high-speed link knowledge; DSP familiarity for bring-up and tuning code.
• Ability to work independently or in a team across hardware, firmware, and manufacturing.
• Passion for high-speed signaling and system-level validation.

Responsibilities

• Characterize TIA/EML/SiPho optical components and tune laser/modulator settings.
• Validate stress receiver tests for 400G/800G/1.6T links and ensure link budgets.
• Build automation scripts for test execution, data collection, and analysis in Python.
• Analyze results, identify root causes, and drive cross-functional resolutions.
• Contribute to DSP bring-up and low-level signal processing code.

Skills

High-speed transceivers

SerDes & SI

DSP bring-up

Lab automation

Cross-functional teamwork

Education

M.S. or higher in Electrical Engineering, Communications Engineering, or Physics

Tools

Oscilloscope

BERT

VNA

Python

Job description

About the role

We are hiring High Speed Transceiver Application Engineer to join our team in San Jose. You will work in a fast-paced, cross-functional environment focused on validating high-speed modules such as 400G, 800G, and 1.6T. The role involves electrical validation, automation development, interoperability testing, and system-level debug. You will collaborate closely with hardware, firmware, and manufacturing teams to ensure robust performance across a variety of operating conditions. We welcome candidates with diverse backgrounds and experience levels who are passionate about high-speed systems and eager to contribute to cutting-edge development.

Base salary range

is $100,000 - $170,000. The base salary offer will depend on factors such as education, experience, training, skills, qualifications, and location. This position is also eligible for a discretionary bonus, equity and a full range of medical and other benefits.

Why Credo

• Purpose: We invest in what matters. From meaningful-future shaping projects to competitive compensation, we empower you to grow your career while making a lasting impact.
• People: Connection starts within. We collaborate, celebrate wins, and create an environment where everyone can do their best work.
• Possibilities: Our belief shapes what’s next. Our technology powers the most reliable and energy-efficient connections around the world – and our team powers new products and markets that come next.

Qualifications

• Master’s or higher degree in Electrical Engineering, Communications Engineering, Physics, or a related field.
• Hands-on experience with high-speed transceivers such as QSFP-DD, OSFP, and AEC, and related lab instruments (e.g., oscilloscope, BERT, and VNA).
• Solid understanding of SerDes architecture, signal integrity, and high-speed link behavior, with familiarity with DSP architecture and the ability to write bring-up and tuning code.
• Strong problem-solving skills and the ability to work independently or in a team, with good communication skills and the ability to collaborate across hardware, firmware, and manufacturing teams.
• Passion for high-speed signaling, system-level validation, and continuous learning.

Responsibilities

• Characterize TIA/EML/SiPho optical components, for example TIA gain and bandwidth, AC response, and bias current and thermal settings tuning for laser and modulator optimization.
• Validate stress receiver sensitivity tests for module performance against OMA-min requirements, ensuring compliance with link budget allocations for 400G/800G/1.6T optical links.
• Build automation scripts for test execution, data collection, and analysis using Python or other programming languages, and conduct environmental and reliability stress testing, including thermal cycling, voltage margining, and soak tests.
• Analyze test results, identify root causes, and drive resolution in collaboration with cross-functional teams; support optical module bring-up, firmware validation, and vendor qualification.
• Contribute to DSP bring-up and tuning, including writing low-level code for signal processing and link optimization.

About Credo

Credo’s mission is to transform connectivity at scale through fast, reliable, and energy-efficient system solutions. Our high-speed copper and optical interconnect products deliver industry-leading power and performance at up to 1.6T to meet the ever-expanding data infrastructure demands of AI.

Our product portfolio includes ZeroFlap (ZF) Active Electrical Cables (AECs) and ZF optical transceivers, OmniConnect memory solutions, and a suite of retimers and DSPs for optical and copper Ethernet and PCIe, all leveraging the PILOT diagnostic and analytics software platform. Credo innovations enable our customers to connect the systems that connect the world.

Credo is committed to creating an inclusive environment for all employees and welcome applicants from diverse backgrounds without regard to race, color, religion, gender, sex, gender identity, sexual orientation, pregnancy, marital status, national origin, ethnicity, genetic information, age, disability, veteran status, or any other legally protected basis. If you have a disability or special need that requires accommodation to navigate our website or complete the application process, email [e-mail].

Salary

140000 - 200000 USD (yearly)