Software Engineer (Mid and Senior Levels)

One Big Circle – Bristol

Full-Time 37.5 hours over 5 Days

Salary: £36,000 - £70,000 depending on experience

The software technology team at One Big Circle is expanding! We are looking for software engineers at all levels of seniority and experience to integrate into our existing team and work across our diverse technology estate.

About One Big Circle

Be part of an award-winning workplace: The Sunday Times Best Medium-sized Technology Company 2025

Formed in 2017, One Big Circle is a fast-growing Bristol technology company that provides “Intelligent Video” solutions. We focus entirely on solving real-world industry problems by fusing new technology in the field of Video, IOT, Cloud and AI providing end to end solutions which allow our customers to dramatically improve their operational efficiency and safety. Our culture is one of high-quality technical delivery and we work at a speed that many industries are unaccustomed to; we have done this by building a team dynamic that challenges and empowers our people and creating an environment where everyone contributes and learns. We are growing, profitable and have ambitious plans to continue expansion in and beyond our existing markets.

We are looking for a proactive and motivated individual to join our team to support the business in further growing our flagship award-winning product: AIVR. AIVR (Automated Intelligent Video Review) is a state-of-the-art video technology system used by thousands of people in the rail industry. AIVR has won dozens of awards and is recognised as the market leading solution, but we are building many more opportunities both in existing and new markets which will further accelerate our growth.

We have built a culture where people feel supported, included, and empowered to do their best work. Our team is growing, and we’d love for you to be part of the journey.

Available Roles

We have a number of roles available that are suitable for engineers with circa 3+ years of experience from ‘mid level’ up to senior. The roles span a number of broad capability areas which describe the kinds of problems we work on. They are not checklists, we recognise that candidates will bring depth in some areas and interest or exposure in others. We encourage interest from applicants with partial or adjacent skills and backgrounds, to fill a number of different roles within each capability area.

Device & Embedded Software Systems

Embedded Linux, C++/Python, embedded systems, multi-sensor and camera-based devices (including thermal and line-scan), data acquisition and edge processing, device-to-cloud pipelines, networking, system integration, hardware/software collaboration, field diagnostics, performance optimisation, secure and robust systems, Linux build systems (e.g. Yocto), media pipelines (e.g. GStreamer), FFMPEG, IoT devices, sensor data processing, signal conditioning, computer vision, FPGA exposure, electronics fundamentals.

Platform Engineering

Cloud infrastructure, AWS, distributed systems, backend services, RESTful APIs, microservices architecture, service integration, data pipelines, storage systems, relational databases (MySQL), scalability, system reliability, observability, infrastructure as code, serverless deployments, containerisation (Docker), AWS services (Lambda, SQS, EC2, S3), IAM permissions (AWS), DevOps security, CI/CD, CI/CD tools (GitHub Workflows), Git, Python development, Python testing frameworks (pytest, unittest), JavaScript knowledge (Node.js), RabbitMQ, FFMPEG, Linux systems administration

Machine Learning

Applied machine learning, computer vision, object detection, image classification, model development and evaluation, data annotation and curation, training pipelines, performance optimisation, edge ML, MLOps, deployment and maintenance of ML solutions, Python development, Python-based ML frameworks, PyTorch, TensorFlow, sklearn, OpenCV, NumPy, feature development, code review, pytest, linting, bug fixing, relational databases, database design and maintenance, AWS/cloud infrastructure, CI/CD pipelines, developer tooling, Linux systems

The Role

As an OBC Software Engineer, you’ll be a hands-on contributor, working closely with experienced engineers to build reliable, high-performance systems across devices, cloud platforms, and applied ML, contributing to real-world, field-deployed solutions. You will take responsibility for defined components and projects, contributing to system design, implementation, testing, and deployment, while continuing to develop your technical and professional skills.

Responsibilities

You will contribute to the development of innovative solutions within a skilled team that likes getting things done:

• Design, develop, and maintain software solutions
• Contribute to system design and technical decision-making within the team
• Collaborate with adjacent teams to achieve system integration
• Take ownership of features, projects, or technical areas (scope matched to experience)
• Diagnose and resolve issues with in-service systems and data
• Contribute to code reviews and help maintain high engineering standards
• Support continuous improvement of development practices, tooling, and system reliability

Personal Qualities and Experience

We are looking for engineers with a strong foundational skillset, a pragmatic approach to problem solving, and a desire to grow. You should be comfortable working in dynamic and multidisciplinary technical teams.

Personal Attributes

• Practical and delivery-focused, balancing engineering rigour with pragmatism
• Strong communication skills, able to work effectively with multidisciplinary teams
• Self-motivated and proactive, with a willingness to take ownership of work
• Comfortable contributing to code reviews and technical discussions
• Willing to support more junior engineers
• Keen to grow into greater responsibility for technical direction and project delivery

Company Benefits Include:

• Auto enrolment Pension Scheme
• 25 Days Holiday plus bank holidays
• Life Assurance
• Private Healthcare Cover
• Work related training courses as required
• Complimentary snacks and refreshments including fresh fruit
• Office-Centric role
• Access to Bike to Work Scheme
• Secure bike storage and shower facilities
• Social events

How to Apply

Join an award-winning team, named ‘The Sunday Times Best Medium-sized Technology Company 2025’. At One Big Circle, you’ll be part of a fast-growing team where your ideas and contributions are truly valued.

Please send your CV and covering letter to jobs@onebigcircle.co.uk.

By applying for this role, you understand that we will process your personal information in accordance with our privacy policy, accessible at https://onebigcircle.co.uk/privacy-policy/

Successful applicants will be required to pass a BPSS (Baseline Personnel Security Standard) check.

Find out more about us at www.onebigcircle.co.uk

Pay: £36,000.00-£70,000.00 per year

Work Location: In person