Earth science LiDAR instruments require high sensitivity receivers that meet strict size, weight, power (SWaP), radiation tolerance, and reliability constraints. Under NASA's Earth Science Technology Office Advanced Component Technology program (ESTO ACT-22), SenseICs developed DARSoC and STARQ as complementary application specific integrated circuits (ASICs) designed to improve performance, reduce LiDAR receiver SWaP, and provide a component path toward qualification for the space environment. DARSoC is an eight channel radiation hardened by design (RHBD) direct time of flight LiDAR system on a chip compatible with linear mode and Geiger mode avalanche photodiodes. It integrates programmable analog front ends, time to digital converters, configurable range of interest selection, histogramming, and data output compatible with common high speed serial interface standards. STARQ, the Single-Photon Triggered Active Rapid Quenching Integrated Circuit, is a compact, high voltage interface ASIC for single photon avalanche diodes (SPADs). STARQ provides avalanche sensing, active quenching, programmable holdoff and reset, gated operation, SPI or I2C control, and a multi-standard configurable digital output. STARQ supports SPAD detectors operating with up to 45 V excess bias and a linear photon count rate exceeding 100 Mcps. Together, DARSoC and STARQ lay the foundation for a future space flight qualified LiDAR receiver with enhanced performance and reduced SWaP for future spaceborne LiDAR instruments.