Senior FPGA/ASIC Modem Engineer

Logos Space; San Diego (CA); On-site; USD 150,000 - 230,000; Full time

Job summary

Logos Space, a leading LEO satellite connectivity company, seeks a Senior FPGA Modem Engineer to design, verify, and release FPGA-based modem solutions for high-throughput satellite links. You will work with SDR-enabled waveform designs and fixed-point FPGA hardware, partnering with modem systems, HW, and FW teams.

The role emphasizes turning ambiguous requirements into practical hardware implementations, mentoring junior engineers, and driving timing closure on advanced FPGA platforms in a

Qualifications

• Bachelor’s degree in a STEM field required.
• 10+ years in wireless baseband modem design using FPGA or equivalent ASIC.
• HDL proficiency: SystemVerilog/Verilog/VHDL.
• Experience with verification frameworks (SystemVerilog/UVM, Cocotb, or similar).
• Deep FPGA architecture knowledge and timing closure techniques; AMD platforms preferred.
• Experience with DFE architectures and high-speed interfaces (DDR, JESD, Ethernet).
• Familiar with FPGA toolchains including simulation, synthesis and timing analysis.
• Experience debugging FPGA hardware in lab settings and SW/HW integration.
• Strong communication and teamwork in fast-paced environments.

Responsibilities

• Own FPGA-based modem chains through all development phases.
• Define micro-architecture of high-rate FPGA modem blocks and implement in SystemVerilog.
• Develop self-checking verification environments using golden references.
• Create synthesis/place-and-route scripts with timing constraints and power analysis.
• Define hardware/software interfaces, registers, telemetry and test hooks.
• Conduct design/code reviews and multi-functional reviews.
• Collaborate with hardware, firmware, and systems teams for lab bring-up.
• Mentor junior engineers and provide FP/HDL leadership.

Skills

HDL programming

SystemVerilog

Verilog

VHDL

UVM

FPGA engineering

DSP concepts

Lab debugging

Embedded SW interfacing

Strong communication

Education

Bachelor’s degree in Electrical Engineering, Computer Engineering, Computer Science, or a related STEM field

Tools

AMD Vivado

Synthesis/Place-and-Route tooling

Oscilloscopes

Logic analyzers

Job description

Logos Space is a Low Earth Orbit (LEO) satellite system purpose-built to serve the connectivity needs of the commercial enterprise users and government users. We will help fill an important gap in the market, providing resilient, high-performance satellite-based connectivity services to enterprise and government customers worldwide. Business customers have contracts with agreed-upon performance standards for their broadband, and Logos will build these capabilities into the system from the beginning. Speed and reliability are the foundation of the system. Logos is designed to extend cloud and data center network connectivity anywhere in the world to fixed, seaborne, and airborne terminals.

Logos is led by a team of highly experienced engineers with proven track records in the networking and satellite industries.

Position Summary

The Baseband Modem hardware team at Logos Space is building a high-performance digital modem payload for the Logos LEO satellite system that supports high-throughput, secure, reliable and resilient communications with an emphasis on waveform flexibility 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. This role is an exciting opportunity to help build a LEO satellite communications system from the ground up using cutting-edge FPGA technology.

We are looking for digital FPGA hardware engineers who can work well in a fast-paced environment, turn sometimes ambiguous requirements into practical hardware implementations, and collaborate closely with adjacent teams.

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.
• A minimum of 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 using these techniques 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.

Additional Information

Logos Space is an equal opportunity employer and values creativity, curiosity, and diverse perspectives. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, national origin, age, disability, veteran status, marital status, or any other status protected by applicable law. Employment offers are contingent on the candidate’s ability to access export-control information in accordance with U.S. law.