Functional Safety Engineering:
Fast, Pragmatic Compliance (SIL3 & PLd)
Compliant Design, Delivered on Time
We build it. You sell it.
Functional safety should shape your embedded system before it becomes an audit problem.
HALready turns safety requirements into real engineering decisions across hardware architecture, embedded software, custom electronics, and Verification & Validation.
Whether your system targets SIL3, PLd, or another required safety level, we build the safety requirements into the architecture from the start. That means identifying risks early, choosing the right protection mechanisms, and creating the technical evidence needed for functional safety compliance.
And speed does not mean cutting corners.
Our pragmatic approach focuses engineering effort where it reduces risk and moves the product forward. Fewer late redesigns. Less technical chaos. A clearer path toward validation, certification, and production.
We build it. You sell it.
Not sure what your system needs to reach compliance?
Book a Free 60-Minute Product Sparring Session to discuss your safety requirements, architecture, risks, and practical path forward.
Smart Code. Smarter Devices.
What is Functional Safety in Embedded Systems?
A standard embedded system is designed to perform its intended function.
A safety-critical embedded system must also respond safely when something goes wrong.
Functional safety focuses on identifying faults that could create unacceptable risk and designing automatic protection functions to control that risk. If a sensor fails, software crashes, communication is lost, or hardware develops a fault, the system must detect the problem and move toward a defined safe state where required.
The objective is not to eliminate every possible risk. It is to reduce risk to an acceptable level and understand the residual risk that remains after safety measures are applied.
That changes how the entire embedded system is engineered.
Safety requirements can influence hardware architecture, software structure, diagnostics, redundancy, monitoring, and failure handling from the beginning.
Because in functional safety, the question is not only:
“Will the system work?”
It is also:
“Will it fail safely?”
Navigating International Safety Standards
Functional safety standards overlap, but they are not interchangeable.
The right framework depends on your industry, product, and safety-related control system.
Standard | Common Application | Safety Classification |
IEC 61508 | Electrical, electronic, and programmable safety-related systems | SIL 1 to SIL 4 |
ISO 26262 | Road vehicles and e-mobility | ASIL A to ASIL D |
EN ISO 13849 | Safety-related parts of machinery control systems | PL a to PL e |
IEC 62061 | Safety-related control systems for machinery | SIL-based |
IEC 61508: The Umbrella Standard for Industrial Systems
IEC 61508 provides a foundational functional safety framework for electrical, electronic, and programmable electronic safety-related systems.
It uses Safety Integrity Levels (SIL) to define the required risk reduction for a safety function.
The standard defines the state of the art in functional safety and provides the framework for engineering a safe system. For engineering teams, that goes far beyond documentation. The required safety integrity influences hardware architecture, diagnostic coverage, redundancy, software development, verification, and the evidence needed for functional safety assessment.
ISO 26262:
Automotive & E-Mobility
ISO 26262 applies functional safety principles to electrical and electronic systems in road vehicles.
A Hazard Analysis and Risk Assessment (HARA) helps establish safety goals and determine the required Automotive Safety Integrity Level (ASIL), from ASIL A through ASIL D.
That classification then influences system, hardware, and software development. For higher-risk functions, safety requirements can affect architecture, diagnostics, fault handling, independence, verification, and development processes.
For companies entering the automotive supply chain, these requirements need to shape engineering decisions early rather than becoming a compliance exercise before launch.
Kernel & Device Driver Development
Machinery and robotics introduce different functional safety requirements.
EN ISO 13849 evaluates safety-related parts of control systems using Performance Levels (PL) from PL a to PL e. Achieving the required PL can depend on factors such as architecture, diagnostic coverage, and component reliability, including MTTFd.
IEC 62061 provides another route for functional safety of machinery control systems and uses a SIL-based approach.
Which standard applies depends on the machine, safety function, control architecture, and applicable regulatory framework.
For products entering European markets, these engineering decisions also need to align with the applicable European Union machinery safety requirements and conformity assessment route.
HALready engineers the hardware and software with the target safety framework in view from the start, helping teams prepare the technical evidence required for assessment by organizations such as TÜV SÜD or relevant DAkkS-accredited conformity assessment bodies.
The HALready Approach:
Agile Functional Safety
Functional safety does not have to turn development into a slow-moving compliance project.
HALready brings safety engineering into the hardware and software architecture early. Instead of designing the product first and trying to prove compliance later, we translate safety requirements into engineering decisions while the system is being built.
That means working at implementation level: component selection, custom PCB architecture, diagnostics, embedded software, RTOS or Embedded Linux architecture, fault handling, and Verification & Validation.
The goal is simple: create the required safety evidence without adding unnecessary engineering complexity.
Hardware Architecture & Metrics: MTTFd, SFF and FIT
Safety requirements eventually become numbers.
Depending on the applicable standard, engineers may need to evaluate metrics such as MTTFd (Mean Time to Dangerous Failure), SFF (Safe Failure Fraction), and FIT (Failures In Time).
These metrics influence real hardware decisions.
Component reliability, diagnostic coverage, redundancy, monitoring, power architecture, communication paths, and the design of custom PCBs can all affect whether a safety function achieves its required integrity or performance level.
This is also where the distinction between random hardware failures and systematic failures matters. Hardware can fail because of physical causes over its lifetime. Systematic failures can originate from specification, design, software, or development-process errors.
Functional safety engineering must address both.
Software Partitioning & SOUP
Software creates a different safety challenge.
Safety-related functions may share processors, memory, operating systems, libraries, or communication resources with non-safety functions. The architecture must prevent a failure in one area from compromising a critical safety function.
Depending on the system, this can require Memory Partitioning, controlled interfaces, deterministic RTOS behavior, defensive programming, diagnostics, and appropriate coding practices such as MISRA C/C++.
Existing COTS components and SOUP (Software of Unknown Provenance) also need careful evaluation. If software was not originally developed according to the project’s required safety process, its use, isolation, failure behavior, and supporting evidence must be considered within the safety architecture.
HALready connects these compliance requirements directly to the embedded implementation instead of treating functional safety as a separate documentation exercise.
Have safety requirements but no clear architecture yet?
Discuss your hardware, software, and functional safety requirements with an expert in a Free 60-Minute Product Sparring Session.
Functional safety cannot be added just before an audit.
The safety lifecycle connects risk analysis, system architecture, implementation, and testing from the beginning. HALready follows this structured approach while keeping engineering decisions close to the people building the product.
The result is a traceable path from the first identified hazard to the evidence needed for functional safety assessment
Item Definition & HARA
Safety engineering starts by defining exactly what the system does, where its boundaries are, and how it interacts with users, hardware, and its environment.
For automotive systems, a Hazard Analysis and Risk Assessment (HARA) identifies hazardous events and helps derive safety goals and the required ASIL.
Those safety goals then influence the technical architecture.Instead of treating HARA as paperwork, HALready uses the results to guide real hardware and software decisions early, when changing the architecture is still practical.
Boot Time Optimization & System Profiling
Slow boot times affect more than engineering benchmarks.
They affect user experience, HMI and GUI readiness, power consumption, product perception, and performance on power-critical edge devices.
HALready profiles the full boot chain to identify and remove the bottlenecks that matter most.
This can include bootloader optimization with U-Boot, kernel startup analysis, driver initialization review, root filesystem cleanup, service profiling, application startup sequencing, power consumption review, and real-time performance analysis.
In one project, HALready created a custom Linux system that booted in under 2 seconds. With the right configuration, deep low-level optimization, and hardware constraints that support it, even boot times close to 1 second can be possible.
That is the advantage of custom Embedded Linux. The system can be shaped around the product’s exact requirements, whether the priority is startup speed, power consumption, security, footprint, or long-term maintainability.
Faster boot starts with measurement, not guesswork.
We identify where time is being lost, whether in the bootloader, kernel, drivers, root filesystem, services, or application layer. Then we focus on changes that create visible product impact.
A faster boot chain improves perceived performance, reduces wasted power, supports stronger validation results, and helps the device feel ready when the user needs it.
FMEA, FMEDA & FTA: Proving What Happens When Things Fail
Once the architecture takes shape, engineers need to understand how failures can occur and what their consequences could be.
Together, these analyses help expose weak points, evaluate risk reduction measures, and determine whether additional diagnostics, redundancy, monitoring, or architectural changes are required.
Verification, Validation & Audit Support
The V-Model lifecycle connects each level of requirements and design with corresponding verification and validation activities.
HALready keeps that traceability in view throughout development, from safety requirements and architecture to embedded implementation and testing.
Depending on the project, this can include reviews, analysis, software and hardware testing, fault-injection testing, and the technical documentation required to demonstrate that safety requirements have been addressed.
Bi-weekly status reporting keeps safety milestones, open risks, verification progress, and required decisions visible throughout development.
When the system reaches independent assessment, the objective is not to start collecting evidence for the first time. The engineering evidence has been built alongside the product.
That creates a more controlled path toward assessment by organizations such as TÜV and reduces the risk of discovering fundamental architecture problems late in development.
PROVEN IN THE MOST DEMANDING GERMAN INDUSTRIES
Why German Engineering Standards Matter for Global Compliance
Functional safety is not only an engineering concern. A failed assessment can mean hardware redesigns, additional testing, delayed market entry, and higher development costs.
HALready GmbH brings the expectations of the German and DACH engineering ecosystem into embedded product development from the start.
Germany’s automotive, machinery, and industrial sectors operate within demanding safety and conformity frameworks. Products may need to demonstrate compliance with applicable European Union requirements and undergo assessment by independent organizations such as TÜV Rheinland or other relevant DAkkS-accredited bodies.
That makes traceability, technical documentation, Verification & Validation, and safety evidence part of the engineering process, not something assembled shortly before assessment.
For international companies targeting European or global markets, this approach can reduce one of the biggest functional safety risks: discovering too late that the product architecture cannot support the evidence required for compliance.
HALready combines these expectations with pragmatic engineering and direct access to technical experts.
The objective is not bureaucracy for its own sake.
It is to build a product whose hardware, software, and safety evidence are ready for serious scrutiny, wherever the product is ultimately sold.
FREQUENTLY ASKED
Questions, answered
How long does SIL certification take?
There is no fixed timeline. It depends on the system complexity, required SIL, applicable standard, product maturity, documentation, testing, and certification body.
Starting functional safety engineering early can reduce delays caused by late architecture changes or missing evidence.
What is the difference between SIL and ASIL?
SIL (Safety Integrity Level) is used in standards such as IEC 61508 and IEC 62061.
ASIL (Automotive Safety Integrity Level) is specific to ISO 26262 for road vehicles.
Both classify safety requirements, but their assessment methods and development requirements are defined by different standards.
Can functional safety be retrofitted to an existing product?
Sometimes, but it can be difficult.
If the original hardware and software architecture was not designed for functional safety, achieving the required level may require significant changes to diagnostics, redundancy, software architecture, components, or documentation.
An early architecture assessment can determine what can be reused and what needs redesign.
Can HALready support both hardware and software functional safety?
HALready works across embedded software and electronics, allowing safety requirements to be considered across custom PCBs, firmware and RTOS or bare metal coding, system architecture, and Verification & Validation.
How fast can engineers start?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
When should functional safety engineering begin?
As early as possible.
Hazards and safety requirements can affect fundamental hardware and software architecture decisions. Addressing them early is usually more practical than redesigning a finished product for compliance.
Not sure what your product requires?
Book a Free 60-Minute Product Sparring Session to discuss your architecture, applicable safety requirements, and practical next ste
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.
Is HALready the right fit for your company?
HALready is ideal for companies without in-house embedded system expertise or with development bottlenecks. We help you move fast without sacrificing quality.