Senior Software Engineer (IoT)

Department: Software Engineering

Employment Type: Full Time

Location: Leeds - Hybrid

Compensation: £50,000 - £70,000 / year

At Parallax, we celebrate the curious. The people who love getting stuck into tough challenges and building technology that genuinely moves the needle and demonstrates the art of the possible.

We’re seeking a highly capable software engineer with a passion for connected systems and end-to-end product delivery. You’ll design, develop and ship software across the IoT stack — from embedded firmware running on microcontrollers to backend services, mobile apps, and web dashboards that our clients use every day.

You’ll spend most of your time writing code, solving complex technical challenges, and working collaboratively with UX designers, engineers and others across multiple projects; with some of your time focused on improving how we deploy, scale, and monitor our applications.

Our clients are diverse, operating across multiple sectors and geographies, often targeting global audiences. We’re innovators at heart, we work with technology that we’re passionate and excited about and use it to produce software and products that our customers love.

• 
  
• Work as part of a cross‑functional squad to design, build and ship high‑quality digital products for our clients
  
• Take ownership of complex technical challenges; unpicking problems and proposing well‑structured, pragmatic solutions
  
• Write, optimise, and maintain firmware for microcontrollers (e.g., ESP32, STM32 or similar), including real‑time control, sensor integration, power management and connectivity protocols such as LoRaWAN. You’ll work closely with our customers to bring devices to life
  
• Build user‑facing applications — mobile apps (mostly in React Native) and web dashboards (TypeScript/JavaScript and modern frameworks)
  
• Contribute to estimates and technical planning alongside your team and the Client Lead
  
• Communicate clearly and confidently with both technical and non‑technical people, from clients to internal stakeholders, to explain ideas, trade‑offs, and recommendations
  
• Implement and improve CI/CD pipelines using GitHub Actions
  
• Support the design, deployment, and monitoring of cloud infrastructure - primarily on AWS (ECS, ECR, Lambda, CloudFront, RDS, etc.) and Azure (you don’t need to be an expert but being interested helps!)
  
• Promote strong engineering practices around code quality, automated testing, peer reviews, observability, and security and help instil a culture of quality and accountability in engineering.
  
• Collaborate closely with designers, product managers and QA to ensure solutions are user‑focused, technically sound, and aligned with client needs.
  

What you need to have:

• 
  
• A passion for connected technology and continuous learning in the evolving IoT landscape.
  
• Strong software engineering background with ideally 3+ years of experience building and maintaining production systems, specifically those interacting with physical devices or sensors.
  
• Experience working on IoT ecosystems, including device‑to‑cloud communication, telemetry data processing, and remote device management.
  
• Strong hands‑on experience with modern JavaScript/TypeScript frameworks (Next.js, React) for building IoT dashboards; proficiency in Node.js or Python for backend/edge logic is highly preferred.
  
• Excellent communication skills and emotional intelligence; able to bridge the gap between hardware constraints and software requirements while collaborating with diverse teams.
  
• A collaborative mindset. You enjoy working closely with hardware engineers, firmware developers, UX designers, and product managers to create seamless experiences.
  
• Confident problem‑solver able to troubleshoot complex distributed systems (e.g., debugging connectivity issues or “ghost in the machine” hardware bugs) while balancing long‑term stability with rapid delivery.
  
• Flexibility to adapt your technical approach to fit existing technology stacks and specific hardware limitations (memory, power consumption, bandwidth).
  
• Proficient with CI/CD pipeline design and automation, including experience with Over‑the‑Air (OTA) update deployments and automated hardware‑in‑the‑loop (HIL) testing.
  
• Passion for code quality, with a strong understanding of TDD, automated testing, and peer review processes tailored for distributed systems.
  
• Deep familiarity with security best practices in IoT/Cloud environments, including device identity (X.509 certificates), encryption at rest/transit, and secure boot concepts.
  
• Familiar with Agile/Scrum methodologies and iterative delivery in cross‑functional teams.
  

Nice to haves (don’t worry if you don’t have any of the following experiences, we’d still like to hear from you)

• 
  
• Curiosity about mentoring or progressing toward a Principal Tech Lead role
  
• Experience working with AWS and/or Azure cloud environments
  
• Experience using infrastructure as code (Terraform and AWS CDK)
  
• Good understanding of monitoring, logging, and alerting (Prometheus, Grafana, CloudWatch etc.)
  

• 
  
• You possess a strong strategic mindset and outstanding interpersonal skills, enabling effective collaboration at all organisational levels.
  
• You excel under pressure, managing multiple complex workstreams while inspiring and guiding your team.
  
• You are self‑motivated, highly organised and eager to challenge the status quo, driving continuous improvement in your own work and that of others.
  
• You have a deep passion for software engineering, meticulous attention to detail and a commitment to delivering solutions that drive tangible business outcomes.
  
• You show pragmatism around balancing the need for process and achieving outcomes.
  

• 
  
• Private medical healthcare (Bupa)
  
• 4% matched pension
  
• Hybrid working (flexible, office time not mandated)
  
• Flexible working
  
• Quarterly company Hack Days
  
• 1 professional development day per month
  
• City centre office
  
• 25 days annual leave + bank holidays + up to 5 loyalty days
  
• Team events
  
• Enhanced maternity leave (12 weeks full pay, followed by 27 weeks of SMP)
  
• Enhanced paternity leave (3 weeks at 90% salary)
  
• 2 streaming services or gym membership subsidised