Semidynamcis is seeking a Senior LPDDR5X Controller/PHY First-Silicon Bring-Up Engineer to support reconstruction, implementation and physical qualification of the LPDDR5X Controller/PHY initialization and training flow, taking controlled verification collateral through to deterministic first-silicon execution and failure diagnosis. Required experience
* Demonstrable DDR/LPDDR post-silicon bring-up experience; LPDDR5/LPDDR5X experience is strongly preferred.
* Strong understanding of memory-controller and PHY initialization, DRAM mode registers, timing configuration and frequency operating points.
* Hands-on experience with PHY initialization firmware, mailbox/status flows, calibration and training procedures.
* Experience diagnosing training failures and separating controller, PHY, DRAM, clock, reset and board-level causes.
* Low-level C/C++ firmware development and direct MMIO/register access.
* Ability to translate ordered verification sequences into deterministic executable firmware with readback, polling and bounded timeout handling.
* Understanding of memory read/write sanity testing and the transition from training PASS to a usable memory configuration.
* Practical laboratory experience during physical first-silicon memory bring-up. Strongly preferred
* Direct experience with Cadence DDR/LPDDR Controller and PHY IP.
* Experience with Cadence PHY firmware/training flows or comparable commercial DDR PHY solutions.
* LPDDR5X frequency switching, training checkpoints and known-good configuration capture.
* Experience with first CPU-visible bandwidth measurements and controlled memory-performance evidence.
* Experience correlating verification traces, register databases and physical-silicon results. Expected responsibilities
* Review existing DDR verification collateral and identify the authoritative initialization/training sequence.
* Help convert the sequence into maintainable low-level C/C++ code rather than a blind register replay.
* Define register access widths, masks, polling conditions and hardware-derived timeouts from authoritative specifications.
* Integrate PHY firmware loading and controlled training/status flows.
* Support first-silicon initialization, training, basic read/write and failure isolation.
* Capture a controlled known-good configuration and reproducible evidence.
* Support the transition to the first controlled CPU-visible read/write/copy bandwidth measurement Why Semidynamics?
* Work for one of Europe’s most promising deep-tech semiconductor scale-ups.
* Accelerated development path.
* 4 days per week in the Barcelona office (city center), 1 day WFH.
* 1 week of work from everywhere in the world.
* Competitive package.
* A collaborative, technical, and growth-oriented environment that values direct ownership and clear thinking.