Invisible Systems
Senior Linux & Embedded Systems Engineer
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Senior Linux & Embedded Systems Engineer
Location: Hybrid (Manchester HQ with flexible working) Salary: Competitive + Benefits Company: Invisible Systems Limited
About Invisible Systems
Invisible Systems is one of the UK's leading providers of smart monitoring solutions, delivering IoT technology that helps organisations improve compliance, reduce energy consumption, and operate more efficiently.
Our technology connects thousands of sensors and intelligent devices across the UK and internationally, providing real-time monitoring of temperature, energy, environmental conditions, and critical assets. As we continue to expand our platform and connected estate, we are looking for an experienced Linux and Embedded Systems Engineer to help build a robust, scalable and secure software deployment infrastructure.
The Role
We are seeking an experienced engineer with a strong background in Linux systems, embedded devices, and infrastructure engineering.
The successful candidate will lead the design and implementation of a reliable, repeatable, and secure software update framework across our fleet of embedded Linux devices. This is a hands-on engineering role involving embedded Linux, networking, cloud infrastructure, and reliability engineering.
You'll work closely with our software, hardware, and DevOps teams to improve the resilience, maintainability, and security of our deployed systems.
Key Responsibilities
- Design, implement, and maintain a reliable over-the-air (OTA) software update process for embedded Linux devices.
- Define update strategies, including rollback, version control, integrity checking, and recovery mechanisms.
- Build release packaging and deployment pipelines for embedded devices.
- Develop automated release testing using hardware simulators and software test harnesses.
- Evaluate and implement proven update frameworks, with bespoke solutions where necessary.
- Design secure methods for remote administration of deployed systems.
- Evaluate and implement centralised Authentication, Authorisation and Accounting (AAA) solutions for SSH access.
- Support infrastructure relating to device connectivity, networking, and cloud services.
- Improve system reliability, monitoring, and operational resilience.
- Produce technical documentation covering deployment processes, recovery procedures, and operational best practices.
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Current Project Scope
-
LoRaWAN Gateway Fleet
- Approximately 1,000 deployed gateways with LTE Cat 1 and LTE Cat 4 connectivity
- ARM and MIPS architectures
- OpenWRT-based Linux systems
-
Energy Monitoring Platform
- Approximately 200 deployed systems
- Raspberry Pi-based
- Node-RED applications
- Serial communications (UART, RS232, Modbus integration)
All systems communicate via secure 4G cellular networks.
Essential Skills & Experience
A candidate should have experience in many of the following:
Linux & Embedded Systems
- Strong Linux administration skills
- Embedded Linux development
- OpenWRT
- Shell scripting (Bash)
- Package management and cross-compilation
- ARM and MIPS architecture development
- Raspberry Pi development
- Embedded networking and device provisioning
- System recovery and rollback techniques
Software Deployment
- Designing OTA update mechanisms
- Release packaging and version management
- Automated deployment and software testing
- Test harness development and hardware simulation
Networking
- IPv4 and IPv6
- IPSec VPNs
- Routing fundamentals
- BGP, network diagnostics
- Secure remote access
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Cloud & Infrastructure (AWS Focus)
- EC2, VPC, Route53, SQS, SNS, Lambda
- CloudWatch, Application Load Balancer (ALB), Network Load Balancer (NLB)
Security
- SSH security and Public Key Infrastructure (PKI)
- Authentication, Authorisation, and AAA solutions (FreeRADIUS, TACACS+, LDAP)
- Secure software deployment and certificate management
Reliability Engineering
- Monitoring, logging, fault tolerance, and high availability
- Incident analysis & root cause investigation
- Operational resilience and infrastructure automation
Desirable Experience (Additional Skills)
- LoRaWAN and MQTT
- Docker and CI/CD platforms (GitHub Actions)
- Infrastructure as Code (Pulumi, AWS CloudFormation)
- Programming languages (JavaScript, C/C++)
- Node-RED, Modbus and industrial communications
- Cellular networking (4G/5G) and IoT platforms
What We're Looking For
You'll be someone who:
- Enjoys solving complex technical problems.
- Can work independently and take ownership of critical infrastructure.
- Takes a pragrantic engineering approach with a strong focus on reliability.
- Produces clean, maintainable, and well-documented solutions.
- Is comfortable working across embedded devices, networking, and cloud infrastructure.
- Has a passion for automation and continuous improvement.
Why Join Invisible Systems?
This role offers the opportunity to design and build the core infrastructure that supports thousands of connected devices across multiple industries. You'll work with modern cloud technologies, embedded Linux platforms, and large-scale IoT deployments while shaping the future architecture of our products.
If you enjoy designing robust systems that operate reliably in the real world, we’d love to hear from you.
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