Senior Optical Application Engineer

Credo Semiconductor, Inc.; 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 Semiconductor, Inc. is hiring a High Speed Transceiver Application Engineer in San Jose to validate high-speed modules (400G, 800G, 1.6T).

You’ll work across hardware, firmware, and manufacturing teams, building automation for testing and debugging system-level performance under varied conditions. The role requires advanced education in electrical/communications physics with hands-on transceiver experience and a passion for high-speed signaling.

Qualifications

• Master’s or higher degree in Electrical Engineering, Communications Engineering, Physics, or related field.
• Hands-on experience with high-speed transceivers (QSFP-DD, OSFP, AEC) and lab instruments like oscilloscope, BERT, VNA.
• Strong problem-solving skills and ability to work independently or in a team.

Responsibilities

• Characterization of high-speed optical components (TIA/EML/SiPho) and tuning laser/modulator settings.
• Validate stress tests and ensure link budgets for 400G/800G/1.6T links.
• Develop test automation scripts using Python or similar languages.
• Conduct environmental and reliability stress testing.
• Analyze results and drive root-cause resolution with cross-functional teams.
• Support optical module bring-up and firmware validation.
• Contribute to DSP bring-up and write low-level signal processing code.

Skills

High-speed signaling

SerDes architecture

DSP bring-up/tuning

Python scripting

Team collaboration

Education

Master’s or higher in EE/Communications/Physics

Tools

Oscilloscope

BERT

VNA

Job description

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].