Senior Software Engineer - Python + React

Salary: Competitive

Location: Braintree, Essex

Work Pattern: Hybrid

We are working with a forward-thinking technology company developing cutting-edge solutions within the utilities sector. Their cloud-native platform integrates software, hardware, and distributed energy assets to enable real-time monitoring, automation, and control at scale.

They are now looking to hire a Senior Software Engineer to play a key role in shaping the technical direction of their platform. This is a hands-on position combining strong engineering delivery with architectural ownership, offering the opportunity to work on complex, real-world systems across IoT, cloud infrastructure, and large-scale data environments.

• Design, build, and operate scalable backend systems using Python (Django) and AWS
• Lead architectural decisions across performance, scalability, reliability, and security
• Design and evolve APIs and data models for internal tools and customer-facing applications
• Drive IoT and device communication architecture across distributed systems
• Collaborate with product and design teams to translate real-world requirements into scalable solutions
• Contribute to frontend development using React and supporting infrastructure
• Build and optimise pipelines for ingesting and querying large-scale time-series data
• Improve system performance, data retention strategies, and reporting capabilities
• Work closely with hardware and edge teams on device provisioning and diagnostics
• Troubleshoot and resolve complex production issues
• Lead and contribute to architecture reviews and technical discussions
• Mentor and support engineers through code reviews, pairing, and design guidance

• Strong proficiency in Python and/or significant experience with React
• Solid experience with SQL and relational database design
• Proven experience working with cloud infrastructure
• Experience with containerisation technologies such as Docker (ECS desirable)
• Strong understanding of RESTful API design
• Experience working with Django and React
• Demonstrated ability to design scalable, maintainable systems
• Strong problem-solving skills with a hands-on engineering mindset

• Experience with microservices or event-driven architectures
• Exposure to time-series databases or large-scale data processing
• Experience working with IoT or distributed device environments
• Interest in renewable energy, industrial systems, or infrastructure technology
• Experience with modern frontend frameworks such as Next.js

• Opportunity to shape the architecture of a complex, real-world platform
• High level of ownership and influence over technical direction
• Work within a small, collaborative, and high-impact engineering team
• Exposure to modern technologies and challenging engineering problems
• Flexible hybrid working environment
• Strong opportunities for career progression as the business scales

If you''re interested in this opportunity, please apply with your CV and a short overview of your experience. Examples of relevant projects or systems you''ve worked on would be highly beneficial.