Embedded Linux contractor

AddSecure; Theale; Remote; GBP 83,000 - 124,000; Full time

Job summary

AddSecure, a leading European secure IoT provider, seeks an Embedded Linux Software Developer contractor in Theale, UK. You will design, implement and maintain software for alarm communication, focusing on C and protocol handling across RS485/Ethernet, with some C++ to C rewrites and local UI/JSON configuration work.

The role emphasizes high quality, unit/system tests in Python, and collaboration with Nordic teams in an international development environment.

Qualifications

• 3+ years in software development for embedded Linux products.
• Strong C development experience in production embedded systems.
• Familiarity with protocol conversion and reading/understanding C++ code.
• Experience with Python for automated tests is a plus.

Responsibilities

• Design and develop new protocol handlers for alarm panels using C over RS485 or Ethernet.
• Add local web page UI elements and JSON configuration.
• Redesign and rewrite existing C++ software in C using small modular processes.
• Maintain code quality via unit tests and system tests in Python and code reviews.

Skills

Embedded Linux

C programming

Python

Git

Agile methodologies

JSON

Tools

Wireshark

MQTT

Job description

Are you an experienced Embedded Linux Software Developer who enjoys working close to the technology, solving complex challenges and building reliable solutions? At AddSecure, you'll have the opportunity to develop software that supports critical alarm communication, working with embedded Linux, C and communication protocols in an international development environment.

AddSecure is a leading European provider of secure IoT connectivity and end-to-end solutions. We help customers optimize their operations, drive business value, and secure vital functions

Our Smart Alarms business unit delivers secure and reliable communication solutions between alarm systems and alarm receiving centers to protect lives, homes, businesses, and assets.

We are seeking a Contractor specializing in embedded Linux systems to join our team. The ideal candidate will have extensive expertise as a software developer, with a strong focus on C and protocol conversion. The development team is centered in Theale, near Reading, UK with colleagues in the Nordic region.

About the job

You will play a crucial role in designing, developing, and maintaining our software solutions, ensuring they meet high-quality standards and fulfill business requirements. Initial responsibilities include:

• Design and develop new robust protocol handlers for alarm panels using C. These protocols are typically over RS485 or Ethernet.


• Add local web page UI elements and JSON configuration.


• Redesign and rewrite existing C++ software in C using small modular processes.


• Maintain code quality via unit tests, system tests in Python and code reviews.

About you

You are a strong software developer who we can depend on to develop and maintain solutions that meet our customers’ requirements. Additionally, you will have:

• Minimum 3 years experience as a software developer for embedded Linux products.


• Very proficient with git (clean commits, fixup with review feedback) and Agile development methodologies.


• Strong commercial experience developing production embedded Linux software in C.


• Ability to read, understand and make minor changes in C++ codebase.


• Reasonable Python skills for writing automated tests.


• Comfortable using AI-assisted development tools, or willing to adopt them where they can improve development productivity and quality.


• Good knowledge of IP technologies such as DHCP, DNS, routing, etc.


• Awareness of different character encodings and conversion.


• If needed, can investigate problems on low-level interfaces such as RS232, RS485 and use Wireshark, etc.


• Good communication and interpersonal skills, with the ability to articulate complex technical concepts to both technical and non-technical stakeholders.


• Good understanding of software security principles and best practices.

Other desirable experience includes BACnet, MQTT and JSON.

We use a competence-based recruitment process that may include psychometric assessments, interviews, reference checks, and background checks. As part of the process, candidates may complete assessments provided by Alva Labs to support a fair and structured evaluation.
We conduct background checks for all our employees, and you must be eligible to work in [country].

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