Embedded Linux Contractor

Addsecure; Reading; On-site; GBP 65,000 - 90,000; Full time

Job summary

AddSecure’s Embedded Linux Software Developer role focuses on building reliable alarm communication solutions in an international team. You’ll work with embedded Linux, C, and protocol handling over RS485 and Ethernet, contributing to secure IoT connectivity and end-to-end solutions.

Responsibilities include designing protocol handlers, UI and JSON configurations, and rewriting C++ components in C with modular processes, while ensuring quality via unit and system tests in Python.

Qualifications

• Minimum 3 years of experience as software developer for embedded Linux products.
• Strong commercial experience developing production embedded Linux software in C.
• Ability to read, understand and modify C++ codebase.
• Proficiency with Git and Agile development methodologies.
• Good Python for automated tests.
• Knowledge of IP technologies (DHCP/DNS/routing) and data encoding concepts.

Responsibilities

• Design and develop new robust 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, system tests in Python and code reviews.

Skills

Embedded Linux

C

Protocol handling

Git

Agile

Python

C++

JSON

MQTT

Wireshark

RS485/RS232

Tools

Git

Python

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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