Radio Frequency Design Engineer

DOODLE LABS (SG) PTE. LTD.; Singapore; On-site; SGD 80,000 - 110,000; Full time

Job summary

A leading technology company in Singapore is seeking an experienced RF Engineer to design and develop innovative RF circuits. This role involves hands-on testing, collaboration across multiple teams, and the use of advanced simulation tools. Candidates should possess a degree in Electrical Engineering and have over 5 years of experience in RF circuit design and validation, including testing with lab instruments. Join a growing firm that specializes in high-performance private wireless systems.

Qualifications

• 5+ years in RF circuit design and validation.
• Hands-on experience with RF power amplifier development.
• Skilled in testing with lab instruments.

Responsibilities

• Lead RF module development including topology selection.
• Use simulation tools for circuit analysis.
• Work closely with PCB layout engineers.

Skills

RF circuit design

Simulation tools (ADS, AWR)

Hands-on testing

Collaboration

Education

Degree in Electrical Engineering

Tools

ADS

AWR

VNAs

Spectrum analyzers

Job description

About Doodle Labs

Doodle Labs is the global leader in high-performance private wireless systems. We build cutting-edge mesh networks for robotics, drones, and the Industrial Internet of Things. Doodle Labs has experienced rapid growth over the past five years as our radio systems have been adopted by Fortune 500 companies (e.g. Airbus, General Electric) and industry-leading innovators (e.g. Boston Dynamics, FLIR).

Your Opportunity

Doodle Labs develops market-leading broadband mesh radios. Products include handheld mesh hotspots (Wearable Smart Radio) and tiny embedded multi-band radios for robots (Helix). Your opportunity is to build novel RF products while implementing Doodle Labs’ patented RF techniques. You will design, simulate, validate, and optimize power amplifier circuits operating between 0.2 and 7 GHz, with output power up to 50W. This role will be hands‑on with testing, debugging, load‑pull analysis, and documentation, and will require deep collaboration with system and hardware teams to deliver high‑performance modules for advanced wireless systems.

Job Description

1. Design and Develop RF Circuits

• Lead RF module development including topology selection, schematic capture, and PCB layout.
• Design for efficiency, gain, and linearity across a broad frequency spectrum.
• Apply advanced impedance matching, stability analysis, and EM simulation techniques.

2. Simulation and Validation

• Use simulation tools such as ADS, AWR, and optionally HFSS or CST for circuit and electromagnetic analysis.
• Perform load‑pull measurements, S‑parameter analysis, and linearity testing.
• Validate designs in the lab using VNAs, spectrum analyzers, signal generators, and power meters.

3. Collaborate Across Teams

• Work closely with PCB layout engineers to ensure best practices in high‑frequency design.
• Coordinate with system architects and digital/RF engineers to meet product specifications.
• Support product engineering with documentation, design reviews, and lessons learned.

4. Deliver Key Milestones

• First 30 Days: Familiarize with existing PA architectures, tools, and lab setup. Begin schematic‑level design of new PA circuit.
• First 60 Days: Complete first‑pass design, initiate simulations, and guide initial PCB layout.
• First 90 Days: Validate the prototype in lab conditions; perform debugging, tuning, and generate a detailed test and evaluation report.

Job Requirements

• Degree in Electrical Engineering, RF Engineering, or a related field.
• 5+ years in RF circuit design and validation.
• Hands‑on experience with RF power amplifier development, including load‑pull, impedance matching, and performance tuning.
• Proficient in RF simulation tools (ADS, AWR) and experienced with EM solvers (HFSS or CST a plus).
• Skilled in testing with lab instruments such as VNAs, spectrum analyzers, and RF signal generators.
• Proven ability to work with layout, digital, and product engineering teams.
• Committed to robust documentation and iterative improvement.