Flash Layer Firmware Engineer (m/f/d)
Swissbit AG6 months ago
Remote, GermanySenior
Responsibilities
- Implement and maintain NAND flash interface firmware for ONFI 4.x/5.x and JEDEC Toggle mode, including timing calibration and multi-die/multi-plane operation.
- Lead the introduction of new flash vendors and generations from preliminary datasheet analysis through production qualification, including FPGA-based prototyping.
- Characterize flash-device behavior across threshold-voltage distributions, read/program/erase disturbances, retention, cell-to-cell interference, program/erase cycles, and temperature ranges.
- Develop and optimize flash-layer calibration and read-retry strategies and provide raw BER and soft-information data to the ECC subsystem.
- Document vendor-specific device behavior and errata for the broader engineering team.
- Debug flash-level issues using logic analyzers and protocol capture and support JESD47/218 reliability qualification and DVT/PVT validation.
Requirements
- Bachelor’s or master’s degree in computer science, engineering, or a related field, or an equivalent qualification.
- Strong experience developing embedded C firmware at the hardware-interface level.
- Strong knowledge of NAND flash architecture and cell physics, including floating-gate and charge-trap technologies.
- Experience with ONFI or Toggle-mode protocols at the register and timing level.
- Hands-on experience commissioning or characterizing at least one real flash technology generation, such as SLC, pSLC, MLC, TLC, or QLC.
- Understanding of NAND reliability mechanisms, including disturbances, retention, threshold-voltage shifts, and cell-to-cell interference.
- Python scripting experience for test automation and characterization-data analysis.
- Experience with Micron, Samsung, Kioxia, SK Hynix, or WDC flash devices is an advantage.
- Good English communication skills; German is advantageous.
- Collaborative working style and openness to teamwork.
Benefits
- Flexible working hours and room for personal planning.
- Opportunities for professional development.
- Well-equipped engineering infrastructure with state-of-the-art EDA tools.
- Corporate benefits including Hansefit, Jobrad, and Pluxee.
- The role is primarily associated with the new Dresden location, with proximity to the development and production site in Berlin.