Diagnostics (DIAG) Engineer – Wireline

At Jabil (NYSE: JBL), we are proud to be a trusted partner for the world's top brands, offering comprehensive engineering, supply chain, and manufacturing solutions. With 60 years of experience across industries and a vast network of over 100 sites worldwide, Jabil combines global reach with local expertise to deliver both scalable and customized solutions. Our commitment extends beyond business success as we strive to build sustainable processes that minimize environmental impact and foster vibrant and diverse communities around the globe. About the Role We are seeking a Diagnostics (DIAG) Engineer to develop and maintain hardware diagnostic firmware and tools for our wireline switch platforms. In this role, you will design, implement, and execute hardware-level tests covering switch ASICs, CPU complex, memory, storage, PCIe, optical modules, and board peripherals — supporting bring-up, validation, manufacturing, and field debug across the full product lifecycle. You will work closely with hardware, BMC, BIOS, SONiC, and validation teams, and your diagnostic suite will be the primary tool used to qualify hardware from EVT through mass production and RMA. Key Responsibilities Design, develop, and maintain diagnostic firmware/utilities for wireline switch platforms (e.g., Tomahawk 5 / Teralynx-class systems), including ONIE-launched DIAG environments. Develop hardware test coverage across: switch ASIC, CPU, DDR, SPI/eMMC/SSD, PCIe, USB, I2C/PMBus devices, CPLD/FPGA, fan/thermal/power subsystems, optical modules (SFP/QSFP/OSFP and CPO), and front-panel ports. Implement port-level diagnostic tests — link bring-up, PRBS, BER, eye margin, loopback (MAC/PCS/PMA), traffic generation, and signal integrity validation. Develop and execute manufacturing test flows (ATE / FATP / system-level test) and work with operations to integrate DIAG into factory provisioning. Support hardware bring-up: be the first responder on board-level issues, isolate failures across silicon / board / firmware boundaries. Build automation around DIAG — scripting, log parsing, pass/fail criteria, and reporting infrastructure. Collaborate with BMC, BIOS, and SONiC teams on shared hardware abstraction, sensor access, and recovery paths. Participate in root-cause analysis of field returns and customer-reported hardware issues. Required Qualifications Hands-on experience developing hardware diagnostics, BIST, or low-level validation tools on server, switch, or embedded platforms. Strong C/C++ programming with solid debugging skills (gdb, JTAG, logic analyzer, scope). Solid understanding of Linux user-space and kernel-space development; comfortable working in ONIE / busybox / minimal Linux environments. Working knowledge of low-level hardware interfaces: I2C, PMBus, SPI, UART, JTAG, GPIO, MDIO, PCIe. Familiarity with switch hardware concepts: switch ASIC architecture, SerDes, MAC/PCS/PHY layers, optical module management (CMIS / SFF-8636), and front-panel port subsystems. Ability to read schematics, board layouts, and component datasheets; comfortable working with hardware engineers in the lab. Experience supporting at least one full hardware product cycle (EVT → DVT → PVT → MP). Bachelor's or Master's degree in Electronics, Electrical Engineering, Computer Engineering, or a related field. BE AWARE OF FRAUD: When applying for a job at Jabil you will be contacted via correspondence through our official job portal with a e-mail address; direct phone call from a member of the Jabil team; or direct e-mail with a e-mail address. Jabil does not request payments for interviews or at any other point during the hiring process. Jabil will not ask for your personal identifying information such as a social security number, birth certificate, financial institution, driver’s license number or passport information over the phone or via e-mail. If you believe you are a victim of identity theft, contact your local police department. Any scam job listings should be reported to whatever website it was posted in. Jabil, including its subsidiaries, is an equal opportunity employer and considers qualified applicants for employment without regard to race, color, religion, national origin, sex, sexual orientation, gender identity, age, disability, genetic information, veteran status, or any other characteristic protected by law. Accessibility Accommodation If you are a qualified individual with a disability, you have the right to request a reasonable accommodation if you are unable or limited in your ability to use or access site as a result of your disability. You can request a reasonable accommodation by sending an e-mail to with the nature of your request and contact information. Please do not direct any other general employment related questions to this e-mail. Please note that only those inquiries concerning a request for reasonable accommodation will be responded to. #whereyoubelong