We provide full-custom optoelectronic IC design for all 3 applications (computing, sensing and communication) and photonic (quantum) systems. Our capabilities include silicon-based single-SPAD and SPAD-array receivers with advanced gating and quenching circuits; ultra-sensitive linear receivers based on PIN diodes and APDs for Discrete-Variable QKD (DV-QKD) and low-noise, broadband balanced detectors with transimpedance amplifiers (TIAs) for Continuous-Variable QKD (CV-QKD). We also offer expertise in multi-channel thermal-control ICs for photonic phase shifters and ring resonators, enabling precise control of complex photonic quantum systems. In addition, we can monolithically integrate QRNG functionality on a commercial CMOS platform.