Senior FPGA/ASIC Modem Engineer Verified today

About Logos Space

Logos Space is building a Low Earth Orbit (LEO) satellite system for enterprise and government connectivity. The system delivers high-performance, resilient broadband to fixed, seaborne, and airborne terminals worldwide with agreed-upon performance standards baked in from the start.

The Role

The Baseband Modem hardware team is building a high-performance digital modem payload for the Logos LEO satellite system that supports high-throughput, secure, reliable and resilient communications using Software Defined Radio (SDR) technology.

As a Senior FPGA Modem Engineer, you will design, implement, verify and release FPGA-based modem solutions for end-to-end wireless satellite communications links. You will work closely with the modem systems team on realization of waveform designs using fixed-point FPGA digital hardware and DSP blocks.

Responsibilities

• Own one or more FPGA-based modem chains through all development phases, from micro-architecture through to lab deployment.
• Define the micro-architecture of high-rate FPGA modem blocks and surrounding digital infrastructure. Implement designs using SystemVerilog or Verilog.
• Develop block-level and end-to-end self-checking hardware verification environments using golden reference models provided by the modem systems team.
• Develop FPGA synthesis and place and route build scripts including timing and placement constraints. Analyze results and implement design changes required to close timing and meet system-level FPGA power and resource requirements.
• Define and implement clean hardware/software interfaces, including registers, configuration, telemetry, fault and status signaling, and test hooks.
• Conduct code and design reviews and participate in multi-functional reviews.
• Collaborate with systems architects, HW engineering design teams and FW/SW design teams for lab bring-up of boards combining FPGA, firmware, RF, and Networking functions.
• Mentor junior engineers and provide technical leadership on FPGA best practices.

Basic Qualifications

• Bachelor's degree in Electrical Engineering, Computer Engineering, Computer Science, or a related STEM field.
• Minimum 10+ years experience in design, development and implementation of wireless baseband modems using FPGA devices. Equivalent experience in ASIC modem design will also receive consideration.
• Proficiency in one or more HDL programming languages such as VHDL, Verilog, or SystemVerilog.
• Experience writing verification frameworks using SystemVerilog/UVM, Cocotb or transactional-level modeling.
• Thorough knowledge of modern FPGA architecture including experience with advanced floorplanning, clock-domain crossing (CDC) analysis, false-path isolation, and timing closure techniques. Experience with AMD UltraScale+ and Versal FPGA families is highly preferred.
• Deep understanding of Digital Front End (DFE) architectures, including digital up/down conversion (DUC/DDC), interpolation/decimation filters, and interfacing with high-speed ADCs and DACs.
• Experience with industry-standard bus interfaces such as AXI and AXI-streaming and high-speed interfaces such as DDR4/5, 10/40/100 Gb Ethernet and SERDES interfaces like JESD-204B/C, Aurora and Interlaken.
• Experience with FPGA toolchains and workflows such as AMD Vivado, including simulation, synthesis, place-and-route, timing analysis and closure as well as power analysis.
• Experience debugging FPGA or digital hardware in the lab using oscilloscopes, logic analyzers, spectrum analyzers, time-interval measurement tools, or similar instrumentation.
• Experience working with embedded software design, especially in complex debugging of FPGA on-target SW/HW interaction.
• Familiarity with Linux-based development environments, Git, and automated testing.
• Strong written and verbal communication and interpersonal skills. Ability to prioritize work, complete multiple tasks and work under deadlines with minimal supervision.

Preferred Qualifications

• Experience implementing both the MAC and PHY layers of a wireless modem such as 5G OFDMA or Single-Carrier DVB-S2(X) through the entire product life cycle for an FPGA or ASIC target.
• Experience with space, defense, or other reliability-critical electronics, including radiation-tolerant design, Triple Modular Redundancy (TMR), and single-event upset (SEU) mitigation techniques.
• Experience with embedded firmware or low-level software for device control, board bring-up, telemetry, and calibration workflows.
• Experience with board-level digital or mixed-signal hardware design, schematic review, clock-tree or oscillator circuitry and hardware bring-up.
• Experience writing tests and automation scripts using C, C++ or Python.
• Experience designing HW accelerators tightly coupled with the embedded processor subsystems present in most modern FPGA devices.
• Experience with the architecture, toolchains and programming of SIMD vector DSP engines for wireless modem applications.