Hello.
I'm looking for a remote job in embedded systems or anything that is related to electronics. I live in Brazil, but I have all the hardware a laboratory requires (and if anything the work requires is missing, I'm willing to buy it), so I'm able to work completely remote with hardware and firmware.

I summarized how I am used to work, my approach to the problems, and my career in electronic engineering/embedded systems developer, in a text.

Note: I'm not expensive because of the conversion between currencies.

Electronics Engineer
Embedded Systems Developer
R&D Specialist

Professional Profile
Multi-domain electronics and embedded systems engineer with 4+ years of professional experience in firmware development, electronics design, signal acquisition and analysis, instrumentation, and product validation. Particularly experienced in moving between abstraction levels—from signal-processing algorithms and mathematical models to STM32 peripheral configuration, FreeRTOS task scheduling, hardware debugging, and system-level validation.

Professional background combines hands-on product development for field-deployable environmental and occupational health instruments with systematic troubleshooting, root-cause analysis, and experimental validation. Approaches technical problems through a bottom-up, causal perspective: rather than accepting formulas, procedures, or system behavior at face value, seeks to understand how each element originates, why each transformation is valid, and how theoretical assumptions translate into real-world behavior.

Core Technical Competencies
Embedded Systems & Firmware
Development of embedded firmware for STM32 and ESP32 using C/C++ · FreeRTOS (tasks, mutexes, semaphores) · STM32 HAL and hardware abstraction · Modular driver architecture · Static-memory-oriented design and avoidance of dynamic allocation · DMA · ADC/DAC · PWM · watchdog timers · timer interrupts · RTC integration · I²C and SPI communication, including custom drivers · Bluetooth on ESP32 · Bootloader and firmware update mechanisms · LVGL-based user interfaces

Electronics & PCB Design
Analog and digital circuit design · Sensor selection and signal conditioning · Passive and active filtering · Buck, boost, and buck-boost DC-DC converter design and control · Battery management and fuel-gauge implementation, including state-of-charge estimation and Impedance Track · Multi-device I²C topologies, including dual-bus architectures and nested pull-up networks · PCB validation and hardware debugging · Layout considerations for noise-sensitive analog circuits

Data Acquisition & Signal Processing
Python-based data acquisition, analysis, and algorithm validation · Digital filter design and implementation testing (FIR/IIR) · Polynomial regression (1D and 2D) · Oscilloscope-based signal characterization · CSV and WAV data processing · Experimental characterization of embedded and electronic systems

Systems Engineering & Validation
Test-plan development and execution · Equipment characterization and calibration procedures · Validation of measurement and instrumentation systems · Workplace safety standards and instrumentation, including noise dosimetry · Systematic troubleshooting based on hypothesis → measurement → root-cause isolation · Design of experiments involving parameter variation and edge-case analysis · Technical documentation, test records, and traceability

Learning Style & Problem-Solving Approach
Bottom-Up Causal Reasoning
When encountering a formula, standard, algorithm, or technical procedure, tends to trace the reasoning back to its underlying assumptions and first principles. Rather than stopping at knowing that a relationship works, investigates where each term comes from, why substitutions are valid, and under which conditions the resulting model remains applicable. This approach supports rapid learning in unfamiliar technical domains and helps identify non-obvious failure modes.

Systematic Diagnostic Workflow
Technical problems are approached through a structured sequence:

Concrete problem → experimental observation → hypothesis formation → numerical or measurement-based testing → logical verification → practical solution

This process is strongly measurement-driven. Oscilloscopes, multimeters, data logging, parameter sweeps, simulations, and controlled comparisons between working and failing systems are used to distinguish assumptions from measurable evidence.

Cross-Layer Technical Fluency
Comfortable transitioning between hardware, firmware, and software abstraction levels. Experience ranges from analyzing magnetic B-H behavior and analog circuits to configuring STM32 peripherals, implementing embedded software, debugging communication buses, processing experimental data, and validating complete instruments.

This cross-layer perspective is particularly valuable in R&D and validation environments, where system behavior often emerges from interactions between hardware, firmware, algorithms, and measurement processes.

Professional Experience
Electronics Engineer & Embedded Systems Developer
4+ years of professional experience

Developed embedded firmware, electronics, and test procedures for field-deployable instruments used in environmental and occupational health applications.

Key responsibilities included:

• Firmware development in C for STM32 and C++ for ESP32, using FreeRTOS, HAL-based abstractions, and modular driver architectures.
• Integration of DMA-driven ADC/DAC systems, timer-based PWM motor control, I²C multi-device architectures, Bluetooth communication, RTC functionality, and battery fuel-gauge systems.
• Implementation of motor-control strategies ranging from open-loop speed matching to closed-loop control based on flow-rate error feedback.
• Development and integration of analog signal-conditioning circuits, including passive and active filtering.
• Integration and control of DC-DC converters through I²C interfaces.
• Implementation of low-power operating modes for battery-powered products.
• Sensor selection, signal conditioning, and hardware-software integration.
• Python-based data analysis and validation of algorithms, including polynomial regression and digital filtering.
• Extensive debugging and validation using serial logging, ST-Link/SWD, oscilloscopes, controlled parameter sweeps, and comparative analysis of working and failing hardware.
• Design and execution of robustness tests and experimental validation procedures.
• Technical communication with international suppliers and development partners.

Products developed and supported: environmental sampling pumps with flow-rate compensation, human vibration meters, digital noise dosimeters with octave-band filtering, bioaerosol impactors, thermal data-logging globes, and calibration flow standards.

R&D Project — Biomedical Sensor Networks
1+ year of R&D experience

Contributed to an IoT-based rehabilitation monitoring system developed through an academic consortium.

Activities included sensor and network architecture planning, wireless communication testing and calibration, prototype deployment in hospital environments, physiotherapy data processing, and development of visualization tools for biofeedback.

Technical Internship — Electronics Product Evaluation
3 months of internship experience

Evaluated the performance of electronic appliances and consumer products through comparative benchmarking and component-level analysis. Conducted measurements, investigated differences between products, and prepared technical test reports.

Education & Professional Training
B.Eng. in Electronics Engineering

Technical Tools & Platforms
Microcontroller Development: PlatformIO (Arduino framework), STM32CubeIDE, STM32CubeMX
Programming: C, C++, Python
Version Control: Git
PCB & Schematic Design: KiCad, Altium Designer, Proteus
Circuit Simulation: LTspice, Multisim, Proteus
Signal Analysis & Data Processing: MATLAB, Python (pandas, NumPy, SciPy), oscilloscopes
UI Development: LVGL
Office & General Tools: Microsoft Word, Excel, PowerPoint, basic Linux

Key Professional Characteristics
Analytical reasoning and systematic troubleshooting · Self-directed learning and rapid adaptation to unfamiliar technical domains · Strong attention to detail · Root-cause investigation and persistence in closing incomplete logic chains · Hardware-software integration · Cross-disciplinary system design · Experimental and evidence-based problem solving

A particular strength is the ability to transform ambiguous technical problems into testable hypotheses, measurable experiments, and reproducible conclusions, connecting theoretical reasoning with practical engineering decisions.

Languages
Portuguese: Native
English: Fluent — technical communication, documentation, and international collaboration

 

I think it will be better if you approach prospective companies through email.

 

I don't think employers scour forum posts on Internet forums looking for talent. Have you signed up with places like LinkedIn, Indeed, and other job search websites?

 

I don't think employers scour forum posts on Internet forums looking for talent. Have you signed up with places like LinkedIn, Indeed, and other job search websites?

No, but AAC has very good SEO and they do use Google, especially if they are looking for a freelancer. So this might be pretty rational.

 

I don't think employers scour forum posts on Internet forums looking for talent. Have you signed up with places like LinkedIn, Indeed, and other job search websites?

Yes, I'm trying everything.

 

If a company hasn't met you in person and/or already knows you, it is going to be significantly more difficult for workers in the AI-era and North Korea fake employee era.

 

If a company hasn't met you in person and/or already knows you, it is going to be significantly more difficult for workers in the AI-era and North Korea fake employee era.

I don't know if I get exactly why you said that. Can you explain?

 

I don't know if I get exactly why you said that. Can you explain?

Why not consider working in Portugal (or even emigrating there) ? you'll then have the whole of Europe on your doorstep. My nephew is Portuguese and now earns a good living in Norway doing web software. The tech sector is the biggest source of jobs for Brazilian ex-pats.

https://www.jobbatical.com/blog/hire-brazilian-workers-portugal-guide

 

https://en.wikipedia.org/wiki/North_Korean_remote_worker_scheme

 

Why not consider working in Portugal (or even emigrating there) ? you'll then have the whole of Europe on your doorstep. My nephew is Portuguese and now earns a good living in Norway doing web software. The tech sector is the biggest source of jobs for Brazilian ex-pats.

https://www.jobbatical.com/blog/hire-brazilian-workers-portugal-guide

I've considered. My english is not that perfect, I just need training on the speaking part, you know, it's muscles. I never been outside my country by some margin. But what is hard is that it's another culture, other people, far away from my family... It's not easy. A friend of mine will emigrate to Houston, and her dad also will some day for her to take care of him when he's old.
If I get to earn in dollar here, Brazil is maybe better to live than starting a life abroad. The minimum wage here is about 1500 reais now, imagine just 3000 dollars/month. That's roughly 15k reais. I can live well and working remote, as I have my own home lab with everything I needed in the past 16 years. And also I'm willing to buy anything that is needed for the job.

 

I've considered. My english is not that perfect, I just need training on the speaking part, you know, it's muscles. I never been outside my country by some margin. But what is hard is that it's another culture, other people, far away from my family... It's not easy. A friend of mine will emigrate to Houston, and her dad also will some day for her to take care of him when he's old.
If I get to earn in dollar here, Brazil is maybe better to live than starting a life abroad. The minimum wage here is about 1500 reais now, imagine just 3000 dollars/month. That's roughly 15k reais. I can live well and working remote, as I have my own home lab with everything I needed in the past 16 years. And also I'm willing to buy anything that is needed for the job.

Why is English important if you went to live in Portugal? You already speak Portuguese! As for culture they share religious and culinary styles.

Perhaps take a vacation there, see the "homeland" you might love it. Brazil has a very high violent crime level too, if you have kids then I imagine Portugal would be much better for them.

Unfortunately if you really truly desperately want to do work you enjoy and earn and save good money, people sometimes have to travel, but if its absolutely not an option you are willing to consider then fine.

I left my home town when I was 22, hated it but I had no options if I wanted a real job. I then moved country when I was 40.

At least think about it.

 

Why is English important if you went to live in Portugal? You already speak Portuguese! As for culture they share religious and culinary styles.

Perhaps take a vacation there, see the "homeland" you might love it. Brazil has a very high violent crime level too, if you have kids then I imagine Portugal would be much better for them.

Unfortunately if you really truly desperately want to do work you enjoy and earn and save good money, people sometimes have to travel, but if its absolutely not an option you are willing to consider then fine.

I left my home town when I was 22, hated it but I had no options if I wanted a real job. I then moved country when I was 40.

At least think about it.

I thought about it, for real.
I heard Portugal is not being that good to emigrate to. I think that if I would go, it would be someplace better.
I left my home town when I was 26 for a real job too, now I'm 31, no kids and don't want to have them. I live 80 km away.
Travels to Europe are expensive here, I don't have that money now...

 

I thought about it, for real.
I heard Portugal is not being that good to emigrate to. I think that if I would go, it would be someplace better.
I left my home town when I was 26 for a real job too, now I'm 31, no kids and don't want to have them. I live 80 km away.
Travels to Europe are expensive here, I don't have that money now...

Well that's your decision man, but how hard is it for a Brazilian to objectively assess Portugal? As I said Brazil has very very high crime rate, homicides, shootings, stabbings, lynchings, cartels, mutilations, police corruption, the prison system is a horror movie. Portugal is one of the safest countries in Europe.

So I have no idea what "not that good to emigrate too" means, from a Brazilian, especially as Brazil is a former Portuguese colony, frankly I cant believe we're having this conversation, good luck man, you'll need it.

https://www.osac.gov/Content/Report/7ce0bb41-df62-4e92-b4b0-1d02a39be392

 

My english is not that perfect.

Your OP states that you are fluent in English, do you know what "fluent" means? Also I read your resume but didn't see any details about any company you have worked for or the dates you worked there.

 

Well that's your decision man, but how hard is it for a Brazilian to objectively assess Portugal? As I said Brazil has very very high crime rate, homicides, shootings, stabbings, lynchings, cartels, mutilations, police corruption, the prison system is a horror movie. Portugal is one of the safest countries in Europe.

So I have no idea what "not that good to emigrate too" means, from a Brazilian, especially as Brazil is a former Portuguese colony, frankly I cant believe we're having this conversation, good luck man, you'll need it.

https://www.osac.gov/Content/Report/7ce0bb41-df62-4e92-b4b0-1d02a39be392

Brazil is not homogenous in all these things you pointed. Porto Alegre is most violent city near me, but I don't go there, and it's 40 km away. I never have been robbed, nor I saw it happening. I've been living in a 250k inhab. city for just 4.5 years, so maybe that's why.
I said "not that good to emigrate to" because I heard people saying it was not having that much job opportunities, full of imigrants, having more problems as a country... I just heard it, so who knows.
Also, it's hard to be distant from family, some people find it easy, I don't.

 

Your OP states that you are fluent in English, do you know what "fluent" means? Also I read your resume but didn't see any details about any company you have worked for or the dates you worked there.

Fluent is below perfect. Being non-native will have the effect of not being perfect, unless you live abroad for a long time.
My resume is public here, so I compacted it in a way to be invisible where I worked. Who is interested will contact me and I'll give my CV.