By Lance Harvie
Specialist embedded and firmware engineering recruiter since 1998
Founder of RunTime Recruitment
Eight seconds. That is what you get.
I am not being cruel when I say that. I am being accurate.
In those eight seconds I am asking one question: can I see this engineer clearly enough to know where they fit? If the answer is no, I move on. Not because I do not care. Because the next CV in the pile might answer that question in three seconds, and I have fifty more to get through before I call anyone.
Here is what kills you in those first eight seconds. Not your qualifications. Not your years of experience. The words you chose to describe your work.
"Responsible for firmware development." "Worked on embedded systems." A wall of fifty tool names with no indication of which ones you can actually build something with. A summary that could belong to a project manager, a test engineer, or a web developer. I close it. Not because you are not good. Often because you are good and your CV is hiding the evidence.
I have been doing this since 1998. Embedded systems, firmware, FPGA, robotics, DSP, hardware-adjacent roles across Australia, the USA, and markets in between. I have read more firmware CVs than I can count. The same mistakes appear decade after decade, from junior engineers and from engineers with twenty years of experience who should know better.
If you are a mid-career firmware engineer and you keep applying into silence, you are probably asking the wrong question. You ask, "Is the market bad?" Sometimes it is. You ask, "Am I too expensive?" Sometimes you are. But most of the time, before any of that matters, your CV has failed the first screen. It has failed before the person reading it has enough information to judge you properly.
This guide is not a motivational document. It is a working document. I am going to show you what gets filtered, what gets ignored, what gets misunderstood by non-technical readers, and what makes a firmware CV look senior instead of busy.
The first damage is usually done by weak verbs. Firmware engineers use phrases that sound harmless to them but signal low ownership to the reader. They also damage keyword matching because applicant tracking systems do not infer seniority from vague participation. An ATS is not impressed that you were "responsible for" something. It matches terms, titles, recency, and sometimes weighted skills. A human then scans for proof.
The five phrases I see over and over are:
- "Responsible for"
- "Worked on"
- "Assisted with"
- "Involved in"
- "Familiar with"
These phrases are not automatically fatal, but they usually appear where evidence should be.
"Responsible for" tells me you had a duty. It does not tell me you delivered anything. In firmware, responsibility can mean you owned the bootloader architecture, or it can mean you attended meetings while someone else wrote the code.
Weak:
Responsible for firmware development on STM32 microcontrollers.
Strong:
Designed and implemented bare-metal C firmware for STM32F4 motor-control units, including ADC sampling, PWM generation, fault-state handling, and UART diagnostics used in production test.
The strong version gives me silicon, language, domain, peripherals, product behaviour, and where the code was used. It also gives the ATS real terms: STM32F4, bare-metal C, ADC, PWM, UART, production test.
Weak:
Responsible for debugging embedded software issues.
Strong:
Root-caused intermittent I2C bus lockups on a battery-powered sensor node by correlating logic analyser traces with firmware state transitions, then added recovery handling that reduced field resets.
That line tells me you can debug at the firmware-hardware boundary. That is worth far more than "debugging embedded software issues".
"Worked on" is the phrase of partial involvement. It tells me nothing about ownership. I see it on CVs from engineers who built major subsystems and from engineers who changed a few configuration values. It flattens both into the same weak signal.
Weak:
Worked on BLE firmware for an IoT product.
Strong:
Implemented BLE GATT services, connection-parameter tuning, and low-power advertising behaviour for an nRF52840 environmental sensor, reducing average current draw during idle operation.
Now I know the chipset, the wireless stack area, the power concern, and the product type.
Weak:
Worked on RTOS tasks and drivers.
Strong:
Built FreeRTOS task architecture for data acquisition, comms, and watchdog supervision on a Cortex-M7 controller, including priority tuning and queue design to prevent sensor-frame loss under peak CAN traffic.
That tells me you understand scheduling, timing, data flow, and failure modes. It signals engineering judgment, not participation.
"Assisted with" can be honest when you were junior. A mid-career firmware engineer using it too often looks like a passenger. If you truly assisted, say exactly what you contributed. If you owned a part, say so.
Weak:
Assisted with development of bootloader.
Strong:
Added firmware update validation to an existing bootloader, including CRC checks, image version enforcement, and rollback handling for failed field updates over CAN.
This version keeps the scope honest. You did not claim you designed the whole bootloader. You stated the contribution in terms a firmware manager understands.
Weak:
Assisted with hardware bring-up.
Strong:
Supported first-board bring-up by validating SPI flash, I2C sensor, GPIO interrupt, and power-rail behaviour using oscilloscope and logic analyser measurements, then corrected firmware init sequencing.
That shows the boundary between hardware and firmware. It also tells me you were useful when the board was not behaving.
"Involved in" is worse than "worked on" because it often hides uncertainty. Were you writing code, reviewing code, creating tests, fixing defects, or sitting in planning sessions?
Weak:
Involved in development of safety-critical firmware.
Strong:
Developed diagnostic and fault-handling firmware for IEC 60730-class appliance control software, including self-test routines, watchdog handling, and documented failure-state behaviour.
That is specific. It gives a compliance context without pretending the reader knows what you did.
Weak:
Involved in testing embedded systems.
Strong:
Created Python-based HIL test scripts to exercise UART command handling, GPIO fault injection, and reset recovery on production firmware before release.
That line helps both the ATS and the hiring manager. It has Python, HIL, UART, GPIO, fault injection, reset recovery, production firmware.
"Familiar with" is a dangerous phrase in the skills section. It sounds honest, but it has no weight. It tells me you may have touched something once. If the job requires that thing deeply, you look weak. If it does not, you look unfocused.
Weak:
Familiar with CAN, SPI, I2C, UART, BLE, Wi-Fi, USB, Ethernet, Zigbee, Modbus, Linux, RTOS, Python, MATLAB, Jenkins, Docker.
Strong:
Deep: C firmware on Cortex-M, STM32, FreeRTOS, SPI/I2C/UART drivers, ADC sampling, PWM control, production debugging.
Practical: CAN, Modbus RTU, BLE GATT, Python test automation, Git, logic analyser and oscilloscope debugging.
Exposure: Embedded Linux user-space diagnostics, Jenkins CI, Docker-based test environments.
Now I can see depth, usable experience, and exposure separately. An ATS still sees the terms. A human sees maturity.
The rule is simple. Replace duty words with delivery words. Replace vague activity with product context, technical constraint, and outcome. You do not need to inflate anything. You need to make the evidence visible.
Most firmware CVs are written as if the first reader is another firmware engineer who has twenty minutes and a schematic in front of them. That is rarely true. The first human reader is often HR, talent acquisition, an operations leader, or a hiring manager who knows the product problem but not the register-level detail. If your CV only speaks to a technical peer, it may never reach one.
This does not mean you dumb it down. I have no patience for firmware CVs that turn real engineering into empty business language. "Delivered innovative embedded solutions" means nothing. The job is to layer the information so a non-technical reader can understand relevance quickly, while the technical reader still sees enough depth to trust you.
Use a three-layer structure in each recent role.
Layer one: product context.
Start each role with one line that explains the product and environment.
Weak:
Embedded Firmware Engineer, ABC Technologies
Better:
Embedded Firmware Engineer, ABC Technologies
Firmware for battery-powered industrial sensor nodes using STM32 and sub-GHz wireless, deployed in mining and remote asset-monitoring environments.
The non-technical reader now understands the type of product. The technical reader sees power constraints, STM32, wireless, and harsh field context.
Layer two: technical ownership.
Use bullets that show what you owned. Avoid long lists of every peripheral touched. Select the areas that map to the target roles.
Example:
Owned low-power firmware design for STM32L4 sensor platform, including sleep-state transitions, wake-on-interrupt behaviour, ADC sampling windows, and radio transmit scheduling.
That line works for both audiences. HR understands low power and ownership. A firmware manager sees the real work.
Layer three: proof.
Proof can be a product outcome, release status, reliability improvement, manufacturing improvement, certification support, field failure reduction, timing improvement, or debugging result. Not every firmware role has clean metrics. That is fine. But you should still show consequence.
Example:
Reduced intermittent field dropouts by adding brownout logging, watchdog reset classification, and startup diagnostics that separated firmware faults from supply instability.
The non-technical reader sees fewer field dropouts. The technical reader sees brownout, watchdog, reset classification, startup diagnostics.
You can also write dual-audience bullets. Start plain, then add technical detail.
Example:
Improved production test reliability by automating firmware-side serial diagnostics for Flash, RTC, ADC, and GPIO checks.
The first half is understandable. The second half proves it is firmware work.
Do not bury the important terms in dense paragraphs. Firmware CVs need scannable lines because the reader is making fast decisions. Use bullets. Keep each bullet to one idea. Put the most relevant technical nouns early.
Bad:
As part of a multidisciplinary team, I contributed to several software and hardware initiatives across the product lifecycle, including enhancements to communication functionality, debugging activities, and testing improvements.
Good:
Implemented RS-485 Modbus firmware changes for industrial controller release, then created Python test scripts to validate command handling across firmware revisions.
The good version is shorter and stronger. It tells me the interface, protocol, product type, release context, and test method.
For non-technical readers, explain acronyms only when they affect comprehension. You do not need to define SPI for a firmware manager, but you may need to anchor the importance of it.
Example:
Built SPI driver and error-recovery handling for external flash used to store calibration records and fault logs.
That is better than:
Built SPI driver.
It is also better than:
Built Serial Peripheral Interface driver.
The first version explains why the driver mattered.
When you list projects, write the first sentence for relevance and the second for depth.
Example:
Product: wireless environmental monitoring node for battery-powered field deployment.
Firmware work: implemented nRF52 BLE services, sensor sampling scheduler, power-state transitions, and DFU validation.
That format prevents the CV from becoming a register dump. It also prevents it from becoming a fluffy product brochure.
The hiring manager wants to answer four questions quickly:
- Has this person worked on products like ours?
- Have they owned firmware, or just touched it?
- Can they handle constraints like power, timing, safety, reliability, manufacturability, or field support?
- Can I put this CV in front of an engineering lead without looking careless?
Write to answer those questions on page one.
"Developed firmware for STM32 microcontroller" tells nobody anything. I see that line constantly. It is not enough for a mid-career engineer. It gives me a platform and a vague activity. It does not tell me whether you wrote a blinking LED demo, built a product, debugged a timing fault, designed an architecture, or maintained somebody else's code under pressure.
Seniority in firmware is not about having the longest list of chips. It is about the quality of decisions under constraints. What did you own? What tradeoffs did you make? What failed? What did you measure? What did you ship? What did the hardware force you to understand?
A task list says what you did. An impact statement says what changed because you did it.
Task list:
Developed firmware for STM32 microcontroller. Implemented drivers. Tested product. Fixed bugs.
Impact statement:
Owned STM32F7 firmware for an industrial pressure-monitoring controller, including ADC acquisition, SPI flash logging, RS-485 Modbus communication, watchdog recovery, and release debugging for units deployed in high-noise electrical environments.
The second version still does not need a dramatic metric. It signals seniority because it shows scope, product, interfaces, fault handling, release context, and environmental constraint.
Weak:
Developed low-power firmware for wearable device.
Strong:
Reworked nRF52832 firmware power states for a wearable health sensor by tuning BLE advertising intervals, sensor sampling cadence, and wake-source handling, extending operating life while preserving data capture requirements.
Why it works:
It names the chipset, the power mechanisms, the product type, and the tradeoff. It does not just say "low power". It shows how low power was achieved.
Weak:
Worked on motor control firmware.
Strong:
Implemented STM32G4 motor-control firmware for BLDC actuator platform, including PWM timing, ADC current sampling, overcurrent fault handling, and calibration routines used during end-of-line production test.
Why it works:
Motor control is not one skill. It is timing, measurement, fault behaviour, hardware dependency, and production reality. The strong version gives me enough to see you have been close to the actual system.
Weak:
Developed embedded Linux software and firmware.
Strong:
Built user-space diagnostics and MCU communication layer for an embedded Linux gateway, using UART and CAN messaging to collect fault logs, update controller configuration, and support field-service troubleshooting.
Why it works:
It separates embedded Linux from MCU firmware instead of blending them into a vague claim. It tells me what the Linux side did, how it communicated, and why it mattered.
Here is the framework I use when rewriting project bullets:
Product + platform + ownership + constraint + proof.
Example:
Product: industrial data logger
Platform: STM32H7, FreeRTOS
Ownership: acquisition firmware and storage pipeline
Constraint: sustained sampling without frame loss
Proof: validated under peak sensor throughput
Final bullet:
Owned STM32H7 FreeRTOS acquisition firmware for industrial data logger, designing the sensor-to-storage pipeline to sustain peak sampling without frame loss during validation.
That is one sentence. It carries weight.
Avoid pretending every bullet needs a number. Bad metrics are worse than no metrics. "Improved performance by 50%" with no context looks made up. If you have credible metrics, use them. If you do not, use concrete proof: released product, production test, field deployment, certification support, reduced resets, diagnosed bus lockups, handled watchdog recovery, passed thermal validation, supported bring-up, prevented data loss.
Strong firmware bullets often include one or more of these:
- The exact MCU, SoC, RTOS, or hardware class
- The peripheral, protocol, or subsystem
- The operating constraint: timing, power, memory, safety, noise, manufacturability, field service
- The ownership boundary
- The release or production context
- The debugging method: logic analyser, oscilloscope, JTAG, SWD, trace, HIL, logs
- The outcome or reason it mattered
If your project descriptions read like job duties, rewrite them. A recruiter cannot sell duties. A hiring manager cannot compare duties. An engineering lead cannot infer judgment from duties.
The skills section is where many embedded engineers damage their own credibility. They write a wall of every tool, protocol, chip, IDE, language, operating system, and lab instrument they have ever touched. It looks like this:
C, C++, Python, Java, MATLAB, LabVIEW, STM32, PIC, AVR, ESP32, nRF52, Renesas, TI, FreeRTOS, Zephyr, Linux, Yocto, SPI, I2C, UART, CAN, USB, Ethernet, BLE, Wi-Fi, Zigbee, Modbus, MQTT, JTAG, SWD, Git, SVN, Jira, Jenkins, Docker, Oscilloscope, Logic Analyzer, Altium, KiCad, RS-485, TCP/IP, ADC, PWM, DAC.
That tells me almost nothing. Worse, it may filter you out because the reader cannot see depth. If a role needs deep FreeRTOS and STM32 experience, but your CV presents FreeRTOS and STM32 as two items buried between Java and Zigbee, you have hidden the match. If the ATS weights keywords, the terms may appear, but the human still has to decide whether they are real.
The skills section should not be a museum. It should be an index of usable strength.
Separate skills by depth and relevance. I prefer a structure like this:
Core firmware: Embedded C, C++ for firmware, Cortex-M, STM32, nRF52, bare metal, FreeRTOS, interrupt-driven design, low-power firmware, bootloaders, watchdog and fault handling.
Interfaces and protocols: SPI, I2C, UART, RS-485, CAN, BLE GATT, Modbus RTU, ADC, PWM.
Debug and validation: SWD/JTAG, oscilloscope, logic analyser, HIL testing, Python test automation, production test diagnostics.
Tools: Git, GCC/ARM toolchains, STM32CubeIDE, Segger, Jira, Jenkins.
This is already stronger because the reader sees categories. But you can go further for a targeted CV.
For a low-power IoT firmware role:
Firmware depth: Embedded C on Cortex-M, nRF52, STM32L4, bare metal and FreeRTOS, sleep-state design, wake-source handling, sensor scheduling, watchdog recovery.
Wireless and interfaces: BLE GATT, advertising and connection-parameter tuning, UART, SPI flash, I2C sensors, ADC battery measurement.
Validation: current profiling, logic analyser debugging, Python-based serial test tools, field fault-log analysis.
For an industrial controls role:
Firmware depth: Embedded C/C++, STM32F4/F7/G4, FreeRTOS, motor-control support, ADC sampling, PWM timing, fault-state handling, bootloader validation.
Industrial comms: CAN, RS-485, Modbus RTU, UART diagnostics, Ethernet diagnostics.
Debug and release: oscilloscope and logic analyser debugging, SWD/JTAG, HIL testing, production test support, field issue root cause.
For an embedded Linux gateway role:
Embedded Linux: C/C++ user-space services, device communication layers, systemd, shell scripting, Yocto exposure, fault logging and diagnostics.
MCU and comms: UART, CAN, SPI, STM32 controller interfaces, bootloader/update coordination.
Validation: Python automation, serial diagnostics, hardware-in-loop testing, field-service support.
Notice what I did not do. I did not try to impress everyone. I showed the depth that fits the target.
You should remove skills that you cannot defend in an interview. If you wrote one Python script five years ago, do not put Python beside C as if they are equal. If you once opened a Zephyr sample project, do not list Zephyr as a core RTOS skill. If you touched USB only through a vendor example, label it as exposure or leave it out.
The biggest mistake is mixing levels. A senior firmware engineer might have deep C, strong FreeRTOS, practical Python automation, exposure to Zephyr, and light familiarity with Docker. If all of those appear in one comma-separated line, the reader has to guess. Most readers guess conservatively.
Use three levels:
- Deep: skills you can design with, debug, explain, and defend.
- Practical: skills you have used in real work but may not own architecturally.
- Exposure: skills you have touched and can discuss honestly, but should not be sold as core strengths.
This structure is not weakness. It is credibility. Hiring managers trust engineers who can distinguish depth from exposure. Firmware work punishes false confidence. Your CV should not pretend otherwise.
The summary is usually the first section I read properly and the first section most firmware engineers waste. Some leave it blank. Some write three generic lines that could apply to a web developer, test engineer, systems analyst, or project manager.
Weak:
Experienced and motivated engineer with strong problem-solving skills and a passion for technology. Able to work independently or as part of a team. Seeking a challenging role where I can contribute to innovative products.
I have seen versions of that sentence for decades. It does nothing. It gives me no domain, no level, no product context, no technical strength, and no reason to keep reading.
A strong firmware summary has to accomplish three things in two or three sentences:
- Tell me what kind of firmware engineer you are.
- Tell me the environments and constraints you understand.
- Tell me why your background matches the roles you want.
Strong:
Mid-career embedded firmware engineer with deep C experience on Cortex-M platforms, especially STM32 and nRF52 products. I build and debug firmware close to the hardware, including low-power sensor platforms, BLE communication, peripheral drivers, watchdog recovery, and production diagnostics. My strongest work is in products where firmware reliability, power behaviour, and field debugging matter.
That summary works because it is specific. It narrows the field. It tells me where to place you.
Another strong example:
Embedded firmware engineer with experience across industrial control products using STM32, FreeRTOS, CAN, RS-485, ADC acquisition, PWM timing, and fault-state handling. I have supported board bring-up, release debugging, production test, and field issue root cause, so I write firmware with the hardware, manufacturing process, and service environment in mind.
That is not poetic. It is useful. It gives the reader a fast map of the CV.
The profile should sit at the top, under your name and contact details. It should not be ten lines. It should not start with personality. It should not claim "excellent communication skills" unless the rest of the CV proves it through cross-functional work, documentation, customer support, certification, or manufacturing interface.
Do not write:
Results-driven firmware professional with extensive experience across the full software development lifecycle.
Write:
Firmware engineer with 9 years in medical and industrial embedded products, focused on C firmware for Cortex-M devices, RTOS task design, peripheral drivers, bootloader validation, and hardware bring-up through production release.
That one sentence carries more hiring value than an entire paragraph of generic career language.
Your summary is not your life story. It is the lens through which the rest of the CV should be read. If the role is low-power wireless firmware, your summary should point at low power, wireless, MCUs, and product constraints. If the role is industrial control firmware, point at real-time behaviour, comms, fault handling, test, and harsh environments. If the role is embedded Linux with MCU integration, make that boundary clear.
The best summaries make me think, "I know where this person fits." The worst make me think, "I still have to read everything and guess."
Do this today. Do not start by changing fonts. Do not start by downloading a template. Firmware CVs fail because the evidence is hidden, not because the margins are wrong.
- Print or open the first page of your CV and give yourself eight seconds.
Look only at the top half of page one. Can I see your current title, product domain, core firmware strengths, and relevant platforms without hunting? If not, fix that before touching anything else.
- Rewrite the summary into two or three firmware-specific sentences.
Use this pattern:
I am a [level/type] firmware engineer with experience in [platforms/products]. I work strongest in [constraints/subsystems]. My background fits roles involving [target work].
Example:
I am a mid-career embedded firmware engineer with experience in STM32 and nRF52 products across industrial sensing and low-power connected devices. I work strongest in C firmware close to hardware, including peripheral drivers, BLE, sleep-state behaviour, watchdog recovery, and production diagnostics. My background fits roles where reliability, power, and field debugging matter.
- Replace weak verbs in your recent roles.
Search your CV for "responsible for", "worked on", "assisted with", "involved in", and "familiar with". For each one, ask what you actually did. Replace the phrase with a delivery verb: designed, implemented, debugged, owned, built, validated, root-caused, released, automated, integrated, reduced, supported.
Before:
Worked on CAN communication.
After:
Implemented CAN message handling and fault recovery for STM32-based controller communicating with battery management modules.
- Add product context under each recent company.
One line is enough. Tell the reader what the product was and what environment mattered.
Example:
Firmware for rugged industrial controllers used in mining equipment, built around STM32 MCUs, FreeRTOS, CAN, ADC acquisition, and RS-485 diagnostics.
Without that line, your bullets float. With it, the reader can place the work.
- Convert task bullets into ownership bullets.
Use this formula:
Platform + subsystem + constraint + proof.
Before:
Developed drivers for sensors.
After:
Developed I2C and SPI sensor drivers for STM32L4 data logger, including startup validation, timeout handling, and fault logging used during field diagnostics.
Before:
Tested firmware.
After:
Built Python HIL tests to validate UART command handling, GPIO fault injection, watchdog reset recovery, and firmware update behaviour before release.
- Rebuild the skills section into depth categories.
Stop listing everything in one line. Use Deep, Practical, and Exposure, or use domain categories such as Core Firmware, Interfaces, Debug and Validation, Tools. Make sure the first category matches the roles you are applying for.
Weak:
C, C++, Python, STM32, FreeRTOS, Linux, BLE, CAN, SPI, I2C, UART, Jenkins, Docker, MATLAB, Git.
Strong:
Deep: Embedded C, Cortex-M, STM32, FreeRTOS, SPI/I2C/UART drivers, ADC acquisition, watchdog and fault handling.
Practical: BLE GATT, CAN, RS-485, Python test automation, HIL testing, production diagnostics.
Exposure: Embedded Linux diagnostics, Jenkins, Docker test environments.
- Remove claims you cannot defend.
If you list USB, expect questions about descriptors, endpoints, classes, and debugging. If you list FreeRTOS, expect questions about task priority, queues, mutexes, ISR interaction, and stack issues. If you list bootloaders, expect questions about image validation, memory layout, rollback, and update failure modes. If you cannot answer at working depth, move it down or remove it.
- Put your strongest firmware evidence in the most recent roles.
Do not make the reader wait until page three to discover you have shipped production firmware. Your most relevant work should appear in the current or most recent role bullets, even if an older job has the most interesting project. If an older project is highly relevant, add a short "Selected Earlier Project" section rather than burying it.
- Read the CV as a recruiter would sell it.
I need to be able to say this in one breath to a hiring manager:
This engineer has 8 years in STM32 and FreeRTOS firmware for industrial controllers, strong C, CAN, ADC, PWM, production test, and field debugging experience.
If I cannot say that after reading page one, your CV is not ready.
- Cut anything that weakens the match.
Old student projects, generic soft skills, unrelated short courses, every IDE you have opened, and tool lists from ten years ago can dilute the signal. Keep what helps the target reader decide.
This process is not glamorous. It works because it forces your CV to do the one job it has: make your evidence visible fast enough that the reader keeps going.
There is a deeper body of work I am developing around how the best firmware engineers think about hardware abstraction, portability, and long-term product maintainability. I have watched this field for nearly three decades, and the strongest engineers do not just write code that runs on a board; they make decisions that survive new silicon, field failures, manufacturing pressure, and the next engineer who has to inherit the product.
- Chapter 1: Replace weak phrases like "responsible for", "worked on", and "assisted with" with firmware-specific delivery evidence that shows ownership, platform, subsystem, and outcome.
- Chapter 2: Layer each role so non-technical readers understand product relevance while technical readers still see silicon, protocols, constraints, and debugging depth.
- Chapter 3: Rewrite project work from task lists into impact statements using product, platform, ownership, constraint, and proof.
- Chapter 4: Stop using a wall of tools; structure skills by depth and relevance so STM32, FreeRTOS, C, CAN, BLE, HIL, or debugging experience is not buried.
- Chapter 5: Use the summary to tell me exactly what kind of firmware engineer you are, where you fit, and which embedded constraints you understand.
- Chapter 6: Apply the eight-second review, weak-verb replacement, product context, ownership bullets, skills restructuring, and defensibility check before sending another application.