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Mid-Level Software Developer Role (PERMANENT).

Assystem in Bridgwater is seeking a motivated Software Developer to support Instrumentation & Control system commissioning on a major nuclear project. You'll design and develop software solutions critical for system startup and performance.

Company Description ⚡️ About Assystem At Assystem, our mission is to accelerate the energy transition worldwide. Our 8,000 Switchers blend historical engineering expertise with cutting-edge digital technologies to drive this change. Join us in revolutionizing the energy sector and making a significant global impact. Why Join the Community of Switchers? Be part of one of the top three largest independent nuclear engineering companies globally. At Assystem, you'll contribute to groundbreaking projects that push the boundaries of innovation and engineering excellence. Join a community committed to driving forward the future of energy. Job Description We are seeking a skilled Software Developer to play a key role in supporting Instrumentation & Control (I&C) system commissioning across a major nuclear project. This role focuses on designing, developing, testing, and supporting software solutions that enable safe, efficient, and compliant commissioning activities on one of the UK’s most significant infrastructure projects. You will develop robust, scalable applications using technologies such as Python, JavaScript, and PostgreSQL, contributing across the full software development lifecycle - from requirements capture and technical design through to implementation, testing, deployment, and ongoing optimisation. We are looking for someone who is comfortable working across both server-side and client-side technologies, has a strong understanding of modern web architectures, and takes pride in delivering clean, maintainable, and high‑quality code. A proactive approach to troubleshooting, performance optimisation, and continuous improvement is essential, along with a desire to stay current with emerging technologies and best practices. This is a hands-on role within a fast‑paced commissioning environment, requiring strong attention to detail, adaptability, and effective collaboration with multidisciplinary teams. Your work will directly support the safe startup and long-term performance of critical nuclear systems. Roles & Responsibilities: Design technical solutions to support I&C commissioning engineers, simplifying the use and interpretation of I&C data. Improve and maintain web-based applications. Implement backend logic, data processing workflows, and automation solutions using Python. Build responsive, user-friendly frontend components and interactive features using JavaScript. Design, manage, and optimise relational databases in PostgreSQL. Write performant SQL queries, stored procedures, and data migration scripts. Ensure data integrity and security across environments. Ensure software quality by testing and writing documentation. Conduct unit testing, integration testing, and assist in user acceptance testing. Write technical specifications and installation procedures. Assist in writing user manuals. Debug, troubleshoot, and resolve software defects across the stack. Deploy and maintain these tools. Collaborate with cybersecurity team. Ensuring high standards of security, performance, and scalability across all developed solutions. Contribute to the continuous improvement of development practices and code quality standards. Qualifications Essential Proven experience developing web applications. Strong proficiency in Python and at least one major Python framework (FastAPI, Flask, Django). Strong knowledge of JavaScript and common front-end libraries (ideally Angular). Solid understanding of SQL database: modelling, query optimisation, and performance tuning. The ability to innovate, think laterally and implement processes. Fluent in spoken and written English. Desirable Degree in software development. Experience with containerisation technologies such as Docker. Familiarity with cloud platforms (AWS, Azure, GCP) or on-premises hosting environments. Additional Information Additional information Join us at Assystem and be part of a global team delivering some of the most exciting and complex engineering projects in the world. This is your chance to shape the UK’s energy future while developing your expertise in a unique environment. Benefits include: Hybrid Working Opportunity Flexible working hours ️ Pension scheme (8% company contribution / 4% personal contribution) ️ 25 days’ paid annual leave + bank holidays + option to buy or sell days Professional fees reimbursed Employee referral scheme Competitive Sick Pay – Support when you need it Income Protection & 3x Salary Death-in-Service Cover Free Digital Gym Access – Expert-led fitness classes 24/7 Employee Support Line – Mental health, financial & legal help We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter! Bring your unique contributions and help us shape the future NOTICE TO CANDIDATES ON RECRUITMENT FRAUD - We are committed to safeguarding candidates from fraudulent activity associated with our recruitment process. Please note that we will never offer specialist CV writing services, request payment or ask for sensitive personal information during the recruitment process. We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future

You are an experienced and proactive software developer with a strong technical background and a passion for delivering high-quality solutions. Reporting to the Software Development Team Lead, the role will focus on developing and maintaining bespoke software solutions using. Provide support and gui

Python/Golang/Rust Developer - Digital Assets arm of Global Hedge Fund - Up to £200k base + Bonus. Python/Golang/Rust Developer - Digital Assets arm of Global Fund - Up to £200k base + Bonus.

AI researchers who specialize in software engineering, logical reasoning, STEM, multilinguality, multimodality, and agents; and second, by applying that expertise to help enterprises transform AI from proof of concept into proprietary intelligence with systems that perform reliably, deliver measurab

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Exciting opportunity for a React / UI Software Developer to join this global Energy company.

Design, develop, and maintain high-performance iOS applications.Collaborate with product managers, designers, and engineers to deliver new features.Write clean, scalable, and well-documented code for maintainability.Troubleshoot and resolve technical issues to ensure optimal performance.Participate

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Corgi is an AI-powered insurance company designed for tech startups.The company has raised $108M and holds regulatory approval as a licensed carrier.The platform is built on Django, utilizes Stripe for payments, and features AI-driven underwriting.Corgi is currently scaling operations into the UK an

R Global Talent is looking for a Software Developer for a permanent role in East Midlands.

Headquartered in San Francisco, our investors include.Develop and maintain complex, production-grade.Design modular, testable codebases using modern.Collaborate asynchronously with AI research teams to improve model training and evaluation.Work independently to meet deadlines and enhance.Experience

From a technical standpoint, the team is looking for experienced software engineers with strong skills in either Python or Java alongside AWS, with the ability to work across a modern cloud environment. Senior Software Engineer (Python/Java, AWS).

Role: Software Developer (React) – Up to £120,000 + Bonus + Package. Software Engineers are treated as the company’s.

Our client, an established and successful Consultancy are looking for a number of experienced Developers to join them on a contract basis.

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Curiosity and pragmatism around applying AI where it meaningfully improves developer productivity or product capabilities. We support thousands of associations, clubs, and communities globally with software that simplifies recurring billing, member engagement, and day-to-day operations. Proactively

Also administrative, coordination, and operational support while developing knowledge, skills and behaviours in line with the software development apprenticeship standard.

Knowledge of cloud software design, particularly AWS.

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OCR Alpha is seeking a Senior Software Engineer focused on Developer Experience in Greater London. The ideal candidate is passionate about developer experience and has a strong background in software engineering and CI/CD systems.

We’re looking for a Junior Software Developer to join us and help build, improve and support the digital services that underpin some of our most important environmental and regulatory schemes. We’re looking for someone with a strong interest in software development and experience working with co

WorldQuant develops and deploys systematic financial strategies across a broad range of asset classes and global markets.We seek to produce high-quality predictive signals (alphas) through our proprietary research platform to employ financial strategies focused on market inefficiencies.Our teams wor

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We are building a new software engineering team with strong applied AI orientation to amplify WorldQuant's success.

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NEC Software Solutions is an equal opportunity employer, welcoming applications from all communities. We’re NEC Software Solutions (part of global tech giant NEC Corporation). While you read this ad, our software is helping to dispatch ambulances, support families, keep trains on the move, locate

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At think‑cell, we’re not just building innovative software – we’re empowering over 1.

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The documentation engineering team is responsible for creating world‑class developer tools and framework‑level support for the documentation workflows on the developer website and Xcode. We’re looking for a software engineer to join the backend team and continue to scale and improve our existi