Senior Optical Application Engineer

Credo; San Jose (CA); On-site; USD 140,000 - 200,000; Full time

Benefits offered by this job

Discretionary bonus

Equity

Medical benefits

Job summary

Credo in San Jose, CA is seeking a High Speed Transceiver Application Engineer to validate high-speed modules (400G, 800G, 1.6T). You will work with hardware, firmware and manufacturing to ensure robust performance across operating conditions.

You will build automation, perform electrical validation, interoperability testing, and system-level debug, collaborating in a fast-paced, cross-functional environment with diverse backgrounds and experience levels.

Qualifications

• Master’s or higher in Electrical Engineering, Communications Engineering or Physics.
• Hands-on experience with high-speed transceivers and lab instruments (oscilloscope, BERT, VNA).
• Strong problem-solving and ability to work independently or in a team.
• Good communication and cross-functional collaboration skills.
• Passion for high-speed signaling and system-level validation.

Responsibilities

• Characterization of TIA/EML/SiPho components and tuning of lasers/modulators.
• Validate stress receiver sensitivity and ensure link budget for 400G/800G/1.6T links.
• Build automation scripts for test execution, data collection, and analysis (Python or similar).
• Perform environmental and reliability stress testing (thermal cycling, voltage margining).
• Analyze results, drive root-cause resolution with cross-functional teams.
• Support module bring-up, firmware validation, and vendor qualification.
• Contribute to DSP bring-up and tuning, including low-level signal processing.

Skills

Strong problem solving

Excellent communication

Team collaboration

Independent work

Passion for high-speed signaling

Education

Master’s degree in Electrical Engineering

Master’s degree in Communications Engineering

Master’s degree in Physics

Tools

Oscilloscope

BERT

VNA

DSP bring-up code

Python scripting

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.

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 rangeis $140,000 - $200,000. 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 related field.
• Hands‑on experience with high-speed transceivers such as QSFP‑DD, OSFP, AEC, and related lab instruments (e.g., oscilloscope, BERT and VNA).
• Strong problem‑solving skills and ability to work independently or in a team.
• Good communication skills and ability to collaborate across hardware, firmware, and manufacturing teams.
• Passion for high-speed signaling, system-level validation, and continuous learning.
• Solid understanding of SerDes architecture, signal integrity, and high-speed link behavior.
• Familiarity with DSP architecture and ability to write bring‑up and tuning code.

Responsibilities

• Characterization of TIA/EML/SiPho optical components. For example, TIA gain and bandwidth, ac response characterization; bias current and thermal settings tuning for lasers and modulators optimization.
• Validate stress receiver sensitivity test for module performance against OMA‑min requirements and ensure 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.
• 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)