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10 back end developer jobs found

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United Kingdom Hourly/Freelance back end developer
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Southampton  (3) West Midlands  (3) Remote  (2) Greater London  (1)
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Contract Spy
Feb 12, 2026
Hourly/Freelance
Data Engineer - AI Trainer at DataAnnotation, Remote, £Hourly Rate
Contract Spy London, UK
Join the DataAnnotation team and contribute to developing cutting-edge AI systems, while enjoying the flexibility of remote work and setting your own schedule. We are looking for a proficient Data Engineer to help advance AI development. As a member of DataAnnotation’s coding team, you’ll be part of a growing community of over 100,000 professionals — including front-end, back-end, full-stack, machine learning, and other engineers — who are driving real-world impact in AI development. Our platform offers an engaging blend of flexibility and challenge: you’ll work closely with state-of the art AI models to take on programming tasks that include creating and solving challenging coding problems, building beautiful apps with rich functionality, and synthesizing insights through data analysis and visualization. Your work directly contributes to refining intelligent systems that learn, adapt, and evolve. Some team members fit this work alongside a...
Contract Spy
Feb 18, 2026
Hourly/Freelance
LEAN Six Sigma Analyst at DEKRA, Southampton, £35-£50 per hour
Contract Spy Southampton, UK
LEAN Analyst - Associate Location: Hybrid, office based in Southampton, SO16 7NS – Domestic and / or limited international travel involved in this role Salary: £35-50 per hour DOE Contract: Associate Basis / Self – Employed   We are DEKRA UK, part of a global organisation employing over 49,000 people in more than 60 countries! In the UK, we deliver a wide range of services spanning all industry types including but not limited to automotive, oil and gas, insurance, manufacturing, and chemical and process safety industries. We are one of the world’s most respected names in safety and risk management. We help organisations operate more efficiently, safely and sustainable – and we’re now looking for a highly skilled LEAN Analyst to join us on an associate basis! This is a unique opportunity to lead major process improvement projects that will directly influence our transformation journey, including the...
Contract Spy
Feb 17, 2026
Hourly/Freelance
Senior Python Engineer - AI Testing Project at Mindrift, Remote, £Freelance Rate
Contract Spy Remote (United Kingdom)
Please submit your CV in English and indicate your level of English proficiency. Mindrift connects specialists with project-based AI opportunities for leading tech companies, focused on testing, evaluating, and improving AI systems. Participation is project-based, not permanent employment. About the Role This project is suited for a Senior Python developer with deep functional testing experience, strong Linux and Docker skills, the ability to read code across multiple languages with the support of LLMs (e.g., C, Rust, Go) and translate requirements for migration tasks, and confidence using tools like Roo Code or Claude Code to accelerate iterative development. Key Responsibilities Create functional black box tests for large codebases in various source languages Create and manage Docker environments to ensure 100% reproducible builds and test execution across different platforms Monitor code coverage and configure automated scoring criteria to meet industry...
Contract Spy
Feb 16, 2026
Hourly/Freelance
Senior Python Engineer - AI Testing Project at Mindrift, Remote, £Freelance Rate
Contract Spy Remote (United Kingdom)
Please submit your CV in English and indicate your level of English proficiency. Mindrift connects specialists with project-based AI opportunities for leading tech companies, focused on testing, evaluating, and improving AI systems. Participation is project-based, not permanent employment. About the Role This project is suited for a Senior Python developer with deep functional testing experience, strong Linux and Docker skills, the ability to read code across multiple languages with the support of LLMs (e.g., C, Rust, Go) and translate requirements for migration tasks, and confidence using tools like Roo Code or Claude Code to accelerate iterative development. Key Responsibilities Create functional black box tests for large codebases in various source languages Create and manage Docker environments to ensure 100% reproducible builds and test execution across different platforms Monitor code coverage and configure automated scoring criteria to meet industry...
Contract Spy
Feb 13, 2026
Hourly/Freelance
Web Developer at LIC, Brierley Hill, £Freelance Rate
Contract Spy Brierley Hill DY5 1SE, UK
Looking for an experienced web developer who can provide ad-hoc support across the business. We are a growing digital agency and need someone reliable, hard-working and eager to learn and develop. Your main duties: Help build websites (Wordpress/Shopify/others) Fix issues with sites (such as loading slow, or updating plugins, using Elementor etc) Responding back to client queries via Slack/WhatsApp/other Assist with email and hosting queries Skills we expect you to have: HTML, CSS, JS, PHP - you don't need to be an expert but you should be able to read it and have a rough idea of what code is doing Wordpress/Elementor/Divi - know the WP environment, how to set it up, fix issues, common problems Shopify - have used Shopify before and understand what liquid code is, templates and metafields NodeJS/React/NextJS - would be very useful if you have had some exposure to these AI - have proven experience of using AI to debug and fix coding issues...
Contract Spy
Feb 11, 2026
Hourly/Freelance
LEAN Six Sigma Analyst at DEKRA, Southampton, £35-£50 per hour
Contract Spy Southampton, UK
LEAN Analyst - Associate Location: Hybrid, office based in Southampton, SO16 7NS – Domestic and / or limited international travel involved in this role Salary: £35-50 per hour DOE Contract: Associate Basis / Self – Employed   We are DEKRA UK, part of a global organisation employing over 49,000 people in more than 60 countries! In the UK, we deliver a wide range of services spanning all industry types including but not limited to automotive, oil and gas, insurance, manufacturing, and chemical and process safety industries. We are one of the world’s most respected names in safety and risk management. We help organisations operate more efficiently, safely and sustainable – and we’re now looking for a highly skilled LEAN Analyst to join us on an associate basis! This is a unique opportunity to lead major process improvement projects that will directly influence our transformation journey, including the...
Contract Spy
Feb 06, 2026
Hourly/Freelance
Web Developer at LIC, Brierley Hill, £Freelance Rate
Contract Spy Brierley Hill DY5 1SE, UK
Looking for an experienced web developer who can provide ad-hoc support across the business. We are a growing digital agency and need someone reliable, hard-working and eager to learn and develop. Your main duties: Help build websites (Wordpress/Shopify/others) Fix issues with sites (such as loading slow, or updating plugins, using Elementor etc) Responding back to client queries via Slack/WhatsApp/other Assist with email and hosting queries Skills we expect you to have: HTML, CSS, JS, PHP - you don't need to be an expert but you should be able to read it and have a rough idea of what code is doing Wordpress/Elementor/Divi - know the WP environment, how to set it up, fix issues, common problems Shopify - have used Shopify before and understand what liquid code is, templates and metafields NodeJS/React/NextJS - would be very useful if you have had some exposure to these AI - have proven experience of using AI to debug and fix coding issues...
Contract Spy
Feb 04, 2026
Hourly/Freelance
LEAN Six Sigma Analyst at DEKRA, Southampton, £35-£50 per hour
Contract Spy Southampton, UK
LEAN Analyst - Associate Location: Hybrid, office based in Southampton, SO16 7NS – Domestic and / or limited international travel involved in this role Salary: £35-50 per hour DOE Contract: Associate Basis / Self – Employed   We are DEKRA UK, part of a global organisation employing over 49,000 people in more than 60 countries! In the UK, we deliver a wide range of services spanning all industry types including but not limited to automotive, oil and gas, insurance, manufacturing, and chemical and process safety industries. We are one of the world’s most respected names in safety and risk management. We help organisations operate more efficiently, safely and sustainable – and we’re now looking for a highly skilled LEAN Analyst to join us on an associate basis! This is a unique opportunity to lead major process improvement projects that will directly influence our transformation journey, including the...
Contract Spy
Feb 02, 2026
Hourly/Freelance
Senior Python Developer - Functional Test Frameworks at Mindrift, Remote, £Freelance Rate
Contract Spy United Kingdom
Please submit your CV in English and indicate your level of English proficiency. Mindrift connects specialists with project-based AI opportunities for leading tech companies, focused on testing, evaluating, and improving AI systems. Participation is project-based, not permanent employment. What this opportunity involves While each project involves unique tasks, contributors may: Coordinate cross-language migration workflows by analyzing C/Rust/Go codebases to create behavioral tests and migration stubs for Rust targets. Design and implement black-box functional test frameworks (pytest + uv, Python 3.10) for native CLI projects. Built reproducible Docker evaluation images and CI pipelines for agent evaluation (Dagger/Codespaces), handling secure workspace setup and git submodule integration. Apply professional judgment to assess AI responses. What we look for This opportunity is a good fit for senior software developers open to part-time,...
Contract Spy
Jan 30, 2026
Hourly/Freelance
Web Developer at LIC, Brierley Hill, £Freelance Rate
Contract Spy Brierley Hill DY5 1SE, UK
Looking for an experienced web developer who can provide ad-hoc support across the business. We are a growing digital agency and need someone reliable, hard-working and eager to learn and develop. Your main duties: Help build websites (Wordpress/Shopify/others) Fix issues with sites (such as loading slow, or updating plugins, using Elementor etc) Responding back to client queries via Slack/WhatsApp/other Assist with email and hosting queries Skills we expect you to have: HTML, CSS, JS, PHP - you don't need to be an expert but you should be able to read it and have a rough idea of what code is doing Wordpress/Elementor/Divi - know the WP environment, how to set it up, fix issues, common problems Shopify - have used Shopify before and understand what liquid code is, templates and metafields NodeJS/React/NextJS - would be very useful if you have had some exposure to these AI - have proven experience of using AI to debug and fix coding issues...
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