RF Engineer – Power Amplifier Design

Doodle Labs LLC; Singapore; On-site; SGD 80,000 - 120,000; Full time

Job summary

Doodle Labs LLC is seeking an RF Engineer with a focus on Power Amplifier Design to lead development of efficient RF modules. The role involves designing, simulating, and optimizing circuits for advanced wireless systems. Responsibilities include collaboration across teams and rigorous testing. Candidates should have a degree in Engineering and over 5 years of RF PA circuit design experience. Join us to shape future communication systems at the intersection of tech and defense.

Benefits

Career Growth

Innovation Environment

High-Impact Role

Qualifications

• 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.

Responsibilities

• Lead PA 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.
• Use simulation tools for circuit and electromagnetic analysis.
• Perform load-pull measurements and validate designs in the lab.

Skills

RF power amplifier development

Load-pull

Impedance matching

Performance tuning

RF simulation tools (ADS, AWR)

EM solvers (HFSS, CST)

Lab testing instruments

Collaboration with engineering teams

Education

Degree in Electrical Engineering

Degree in RF Engineering

Tools

ADS

AWR

HFSS

CST

VNAs

Spectrum analyzers

RF signal generators

Job description

RF Engineer – Power Amplifier Design
Location: On site
Company: Doodle Labs – Robotics and Defense Technology

About Doodle Labs
Doodle Labs is a fast-growing technology company at the forefront of robotics and defense innovation. We build mission-critical communication systems that enable autonomous systems to operate in challenging environments. Our solutions are deployed worldwide in defense, industrial, and commercial applications, providing robust connectivity in demanding conditions.
We are seeking a Radio Frequency (RF) Engineer with a focus on Power Amplifier (PA) Design to lead the development of high-efficiency, high-linearity RF PA modules from concept through to production.

About the Job
The RF Engineer – PA Design 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.

What You’ll Do
1. Design and Develop PA Circuits

• Lead PA 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.

Who You Are

• PA Design Expert: Hands-on experience with RF power amplifier development, including load-pull, impedance matching, and performance tuning.
• Tool Savvy: Proficient in RF simulation tools (ADS, AWR) and experienced with EM solvers (HFSS or CST a plus).
• Lab-Ready Engineer: Skilled in testing with lab instruments such as VNAs, spectrum analyzers, and RF signal generators.
• Cross-Functional Collaborator: Proven ability to work with layout, digital, and product engineering teams.
• Detail-Oriented Designer: Committed to robust documentation and iterative improvement.

Why Join Us?

• High-Impact Role: Help define the next generation of high-performance wireless systems.
• Innovation Environment: Solve advanced RF engineering challenges in a collaborative setting.
• Career Growth: Work at the intersection of RF design, systems engineering, and product development.
• Mission-Critical Tech: Build solutions that matter for defense, robotics, and industrial autonomy.

Required Qualifications

• Education: Degree in Electrical Engineering, RF Engineering, or a related field.
• Experience: 5+ years in RF PA circuit design and validation.

Are you ready to amplify your impact? Join Doodle Labs and shape the performance of tomorrow’s wireless communication systems.