Wafer Level Test Engineer/Lead

Job description

About the role We are seeking an experienced Wafer-Level Test (WLT) Engineer/Lead based in Taiwan (Hsinchu area preferred). You will own wafer-level (CP / wafer sort) test for Lyte's custom mixed-signal CMOS silicon, the chips at the heart of our products. You will develop, validate, and maintain ATE wafer-level test programs with Lyte's test house partners, and transfer released programs to OSAT partners for volume production. What you'll do Own wafer-level (CP / wafer sort) test at Lyte's Taiwan test house partners, managing test program development, engineering lots, and production wafer sort. Develop ATE wafer-level test programs for mixed-signal CMOS on Advantest V93000 or Teradyne platforms. This covers test program architecture, test flows, pin/levels/timing set-ups, binning, and limits tables. Work daily with Lyte's chip design team at our US headquarters to translate design into test plans, test specifications, and test coverage matrices. Implement and debug BIST, scan/DFT, analog and mixed-signal parametric tests, and OTP/eFuse trimming routines. Validate test programs before first silicon using offline/virtual tester environments and pattern conversion (WGL/STIL/VCD) from design simulation. Bring up new silicon on the tester, covering first-silicon debug, characterization, and correlation between bench, ATE, and simulation results. Maintain released programs across their lifecycle, with full regression and sign-off. This covers change requests, limit updates, bug fixes, test-time reduction, and yield improvements. Transfer released test programs to OSAT partners for volume production. This includes tester-to-tester and site-to-site correlation, GR&R, golden-wafer checks, and production release readiness. Deploy and maintain test programs at partner sites, including production issue triage, excursion response, and root cause and corrective action (8D / 5-Why). Work with partners on probe card specification and qualification, prober set-up, contact/overdrive optimization, and tester hardware debug. Analyze wafer test data (STDF, wafer maps, bin Paretos, Cp/Cpk) to monitor yield, detect excursions, and drive yield and test-time improvements. Extend Lyte's capability into advanced wafer-level test as programs mature, including optical wafer-level test, working with partners on test methods, hardware, and correlation. Own test documentation and version control so every build is traceable and reproducible across partner sites. Report regularly on test development, yield, and production readiness to engineering and operations leadership. Travel to test house and OSAT facilities in Taiwan and across Asia as needed to resolve issues and support production ramps. Required Qualifications Bachelor's degree in Electrical Engineering, Electronics, Computer Engineering, Physics, or a related field. 5+ years of hands-on ATE test program development for mixed-signal CMOS ICs, including direct wafer-level (CP / wafer sort) experience. Hands-on experience with Advantest V93000 (SmarTest) and/or Teradyne (UltraFLEX, J750, or similar) platforms. Working knowledge of BIST/DFT test methods and OTP/eFuse trimming at wafer level. Experience validating test programs pre-silicon in collaboration with chip design teams. Proven experience maintaining production test programs and supporting OSATs or test houses, including program transfer and correlation. Programming in C/C++ and/or Java (SmarTest) or VB/VBT (IG-XL). Python or Perl scripting is a plus. Solid data analysis skills: STDF, wafer maps, yield Paretos, Cp/Cpk, and GR&R. Disciplined documentation, version control (e.g., Git/SVN), and change-management practices. Strong written and spoken English to work with HQ engineers across time zones, plus Mandarin fluency to work with local partners. Ownership mindset and strong teamwork. You are comfortable working independently at partner sites and willing to travel regularly within Taiwan and occasionally across Asia. Preferred Qualifications Master's degree in Electrical Engineering or a related field. Experience as a test lead, owning test strategy and coordinating multiple test house and OSAT partners. Familiarity with probe card design and qualification, load boards, and prober set-up and cleaning recipes. Prior experience at, or working closely with, a Taiwan test house or OSAT. Experience with test-time reduction, multi-site test development, and adaptive test / outlier screening (e.g., Part Average Testing). Experience with yield-management and analysis tools (e.g., JMP, Spotfire, or similar). Experience testing analog/mixed-signal blocks such as ADCs/DACs, PLLs, LDOs, bandgaps, and high-speed interfaces. Knowledge of automotive quality standards such as AEC-Q100. Experience with known-good-die (KGD) screening and advanced-packaging wafer-level test. Experience with, or strong interest in, optical and silicon photonics wafer-level test. Familiarity with lidar, FMCW, photonics, or robotics sensor technologies. Benefits (subject to location and local regulations) Competitive salary and equity Flexible vacation and time-off policy Collaborative, fast-paced, and inclusive work environment Opportunity to work on cutting-edge technologies with a highly cross-functional team About Lyte Lyte builds perception systems for Physical AI operating in complex environments. The company combines custom silicon, integrated sensors, and software into a unified platform for robotics, mobility, and next-generation automation. Lyte is headquartered in Sunnyvale, California, with a global presence. For more information, visit If you’re excited about building impactful technology in a dynamic, hands-on environment, we’d love to hear from you!