39 software developer jobs found

Software Developer — Build Your Own Project with an AI Coding Assistant About The Role What if you could get paid to work on the project you've been meaning to build — with a state-of-the-art AI coding assistant at your side, completely free of charge? We're looking for software developers in the London area to bring their own projects and build them using an AI-powered coding assistant. You write real code on real projects you care about. We learn from your expert judgment on how the assistant performed. You keep full ownership of everything you build. This is a fully remote, flexible contract role designed for developers who want to ship their own work — and get compensated for it. Organization: Alignerr Type: Hourly Contract Location: Fully Remote Commitment: Flexible What You'll Do Bring a software project you personally own — a side project, a tool, an open-source library, or something you've been meaning to...

AfterQuery is looking for experts with experience in software engineering, computer science, or app/web development to help train and evaluate AI models. This is a remote, project-based role: qualify once through a single assessment and receive ongoing project matches spanning code review, evaluation, and original task creation. Pay ranges from $50 to $100/hour depending on the projects you qualify into. Why Apply Competitive Pay: $50–$100/hour across the project pool One Assessment, Ongoing Matches: qualify once, get matched to projects continuously Flexible Engagement: fully remote and asynchronous, on your own schedule Responsibilities Complete software engineering tasks across a range of AI training and evaluation projects Review and evaluate code and model outputs for correctness and quality Deliver clear, well-documented work independently Required Qualifications 2+ years of real-world software engineering experience...

Mobile Software Engineers, iOS, Android & Cross-Platform Developers. Remote AI Project   We are seeking experienced Mobile Software Engineers, iOS Developers, Android Developers, React Engineers, and Flutter Developers to contribute to a remote AI project focused on advanced mobile software engineering.   You will create challenging coding environments that test an AI model’s ability to debug mobile applications, build non-trivial features, refactor complex code, manage application state and lifecycle, and optimize performance.   What You’ll Do   Create realistic and technically challenging mobile software engineering tasks using real or representative codebases. Design problems involving bug fixing, feature development, application state, lifecycle behavior, asynchronous workflows, refactoring, and performance optimization. Build tasks for React, Flutter, iOS, or Android applications based on your...

The Ministry of Justice (MoJ) priorities include improving public safety and reducing reoffending by reforming prisons, probation and youth justice, and building a justice system which makes access to justice swifter and more certain for all citizens whatever their background. Project professionals in the MoJ help to improve the government’s ability to protect the public and reduce reoffending, and to provide a more effective, transparent and responsive criminal justice system for victims and the public.   Background: The Digital Automation Programme has a growing portfolio of automation development initiatives designed to reduce manual effort, improve service delivery, increase productivity, and enable data-driven decision making across the organisation in line with the Governments Digital Objectives.   As a   Power Platform Developer , your main responsibilities will be: Delivery of approved programme roadmap initiatives and project...

SC Clearance is an essential requirement for this role, as a minimum you must be willing & eligible to undergo checks. Please note, due to the exceptional requirements of this position (short-term nature of this role and speed at which we require a postholder in situ) preference may be given to candidates who meet all of the essential criteria and hold active SC clearance.    The CPS prosecutes criminal cases that have been investigated by the police and other investigative organisations in England and Wales. The CPS is independent, and they make their decisions independently of the police and government.   Their duty is to make sure that the right person is prosecuted for the right offence, and to bring offenders to justice wherever possible.   The CPS are passionate about ensuring that they are a top-performing organisation and a great place to work. They are committed to being an equal opportunities employer and creating a culture...

Senior Full-Stack Developer — AI & Business Applications Remote contract | Ongoing work for the right person We’re looking for an experienced full-stack developer to help us build and improve a range of applications and systems across our businesses. You’ll work directly with the company CEO to understand business needs, discuss ideas and turn them into clear, working software. Strong communication is important: you should be comfortable explaining technical matters in plain English, asking questions when requirements are unclear and giving regular progress updates. One of the systems you’ll work on is our AI customer-service platform. It uses React and supports email, WhatsApp, website live chat and telephone, with customer history, tickets and AI-assisted replies. There will also be opportunities to develop other customer-facing applications, admin tools and business workflows. We use modern AI development tools, including Claude and...

ABOUT THE OPPORTUNITY Islands Book Trust invites proposals from experienced freelancers, website developers and small studios to develop Islands Server, a free-to-use digital platform for Scotland’s islands. This platform will enable people and organisations to contribute, preserve and discover video, audio, oral histories, heritage, stories, photographs, projects and contemporary cultural material. This commission is for technical design, development, implementation, testing and handover, not a new brand or visual redesign. IBT will work in collaboration to provide the concept, visual and editorial direction, content, partnerships and ongoing platform management. The SSEN allocation of £15k relates directly to the website development, digital hub architecture, Islands Voices archive, hosting configuration, data handling and security, including targeted specialist support. The site structure is based on ISLANDS | PEOPLE | PROJECTS | VOICES | KNOWLEDGE,...

Senior Front-End React Developer At Bridebook, we're digitising the wedding industry! Join us in transforming the wedding planning experience for engaged couples around the world. Full-time Contractor · Remote · Competitive Day Rate Who is Bridebook anyway? Bridebook is a revolutionary wedding planning platform that seeks to make wedding planning an enjoyable, intuitive, and rewarding experience for couples, guests, and industry partners. Launched in the UK, Bridebook has over 1,000,000 planning couples and has been featured in major outlets such as the New York Times, the BBC, and the App Store. After seven years and many iterations later, we have 2 in 3 engaged UK couples and 1 in 3 engaged German couples using Bridebook, and have recently expanded into the French and Irish markets. While we serve a very emotional and creative industry, we are disrupting the wedding industry by leveraging cutting-edge technology to provide seamless and...

Are you a Kotlin expert eager to shape the future of AI? Large-scale language models are evolving from chatbots into powerful developer assistants capable of reasoning about complex software systems. With high-quality engineering data, tomorrow's AI can support developers in solving real-world problems faster and more accurately. That training data begins with you—your coding expertise will help power the next generation of AI. We're looking for Kotlin specialists who can take real-world engineering scenarios—such as bug reports or feature requests in a Git repository—and produce clean, efficient, and idiomatic solutions using the Kotlin programming language. You'll create high-quality code patches that reflect modern Android development practices and ensure technical correctness, maintainability, and clarity. You should have hands-on experience with modern Android and Kotlin development, including Jetpack Compose, Kotlin Coroutines, and Jetpack libraries such...

ABOUT THE OPPORTUNITY Islands Book Trust invites proposals from experienced freelancers, website developers and small studios to develop Islands Server, a free-to-use digital platform for Scotland’s islands. This platform will enable people and organisations to contribute, preserve and discover video, audio, oral histories, heritage, stories, photographs, projects and contemporary cultural material. This commission is for technical design, development, implementation, testing and handover, not a new brand or visual redesign. IBT will work in collaboration to provide the concept, visual and editorial direction, content, partnerships and ongoing platform management. The SSEN allocation of £15k relates directly to the website development, digital hub architecture, Islands Voices archive, hosting configuration, data handling and security, including targeted specialist support. The site structure is based on ISLANDS | PEOPLE | PROJECTS | VOICES | KNOWLEDGE,...

Software Engineer (C#) — Internal Tooling (AI Infrastructure) About The Role What if your C# expertise could directly shape the infrastructure powering the next generation of AI? We're looking for experienced full-stack C# engineers to build and optimize the data pipelines, annotation systems, and evaluation tooling that leading AI labs depend on every day. This isn't maintenance work or low-stakes ticket-churning. You'll be working on real production systems at the frontier of AI development — the kind of infrastructure that determines how AI models are trained, measured, and improved. Organization: Alignerr Type: Hourly Contract Location: Remote Commitment: 20–40 hours/week What You'll Do Design, build, and optimize high-performance C# systems supporting large-scale AI data pipelines and evaluation workflows Develop full-stack tooling and backend services for data annotation, validation, and quality control at scale...

Senior Front-End React Developer At Bridebook, we're digitising the wedding industry! Join us in transforming the wedding planning experience for engaged couples around the world. Full-time Contractor · Remote · Competitive Day Rate Who is Bridebook anyway? Bridebook is a revolutionary wedding planning platform that seeks to make wedding planning an enjoyable, intuitive, and rewarding experience for couples, guests, and industry partners. Launched in the UK, Bridebook has over 1,000,000 planning couples and has been featured in major outlets such as the New York Times, the BBC, and the App Store. After seven years and many iterations later, we have 2 in 3 engaged UK couples and 1 in 3 engaged German couples using Bridebook, and have recently expanded into the French and Irish markets. While we serve a very emotional and creative industry, we are disrupting the wedding industry by leveraging cutting-edge technology to provide seamless and...

Are you a Kotlin expert eager to shape the future of AI? Large-scale language models are evolving from chatbots into powerful developer assistants capable of reasoning about complex software systems. With high-quality engineering data, tomorrow's AI can support developers in solving real-world problems faster and more accurately. That training data begins with you—your coding expertise will help power the next generation of AI. We're looking for Kotlin specialists who can take real-world engineering scenarios—such as bug reports or feature requests in a Git repository—and produce clean, efficient, and idiomatic solutions using the Kotlin programming language. You'll create high-quality code patches that reflect modern Android development practices and ensure technical correctness, maintainability, and clarity. You should have hands-on experience with modern Android and Kotlin development, including Jetpack Compose, Kotlin Coroutines, and Jetpack libraries such...

About The Role What if the code you write could directly power the AI systems shaping how millions of people interact with technology? We're looking for Back End Developers based in London to design, build, and optimize the server-side systems and APIs that drive cutting-edge AI products — from data pipelines and model-serving infrastructure to scalable microservices that handle real-world traffic at scale. This is a fully remote, flexible contract role. Whether you're a seasoned engineer looking for meaningful project work or a strong developer ready to apply your skills to AI-adjacent infrastructure, this is your chance to build things that matter. Organization: Alignerr Type: Hourly Contract Location: Remote Commitment: 10–40 hours/week What You'll Do Design, develop, and maintain robust back end services, APIs, and data pipelines Build scalable, high-performance server-side architecture to support AI training and inference...

Contract Lead .Net Developer - Optimizely Description We are recruiting for a Contract Lead .NET Developer with strong experience in modern .NET/C# architectures and hands-on Optimizely experience, stepping in to spearhead the build of greenfield digital platforms for one of our key enterprise clients. Role Overview Role:  Lead .NET Developer (Associate / Contract) Rate:  £550 – £600 per day Location:  Primarily remote (occasional travel to client sites in London / Watford) Duration:  6-month initial contract (strong potential for extension) Start Date:  ASAP Who We Are: AND Digital are a tech company focused on accelerating digital delivery and dedicated to closing the digital skills gap. We’ve been helping organisations build better digital products and stronger digital teams since 2014.We believe our work should always make a remarkable impact for our clients. We do this through...

Contract: Outside IR35 Commitment: 2-3 days a week Additional days: £280 per day, subject to prior written approval Location: UK-based, remote Start date: 20 November 2026 Term: Initial MVP contract with the possibility of extension   ABOUT VAULTIER Vaultier is building a private collection-management platform for wealthy collectors and the people authorised to manage their collections. The product will hold sensitive information about valuable pieces, including ownership, value, location, documents, actions and access permissions.   THE ROLE Vaultier is looking for an independent QA engineer to test its responsive web MVP.   You will review completed features against approved requirements, identify defects and risks, and provide clear evidence of whether each release is ready. You will work independently from the full-stack engineer while collaborating with Product, UX and Development.  ...

AI Automation Developer / Workflow Automation Specialist Location: Remote, United Kingdom Job Type: Freelance / Self Employed Contractor Pay: £250 to £400 per day, depending on experience Start Date: November 2026 Working Arrangement: Flexible, project based, with potential for ongoing work About Us We a new UK based AI automation company focused on helping businesses improve efficiency, reduce operating costs, increase productivity and streamline their daily operations through intelligent automation. Our ambition is to establish a successful and scalable technology business providing practical AI and automation solutions to companies throughout the UK, with plans to expand into international markets. We are seeking an experienced, commercially minded AI Automation Developer to help establish the technical foundations of the company, develop our initial services and deliver reliable automation solutions to business clients. As a new...

Senior Front-End React Developer At Bridebook, we're digitising the wedding industry! Join us in transforming the wedding planning experience for engaged couples around the world. Full-time Contractor · Remote · Competitive Day Rate Who is Bridebook anyway? Bridebook is a revolutionary wedding planning platform that seeks to make wedding planning an enjoyable, intuitive, and rewarding experience for couples, guests, and industry partners. Launched in the UK, Bridebook has over 1,000,000 planning couples and has been featured in major outlets such as the New York Times, the BBC, and the App Store. After seven years and many iterations later, we have 2 in 3 engaged UK couples and 1 in 3 engaged German couples using Bridebook, and have recently expanded into the French and Irish markets. While we serve a very emotional and creative industry, we are disrupting the wedding industry by leveraging cutting-edge technology to provide seamless and...

UK Senior Technical Advisor – Fintech Marketplace Platform (3-Month Contract)   We are an early stage fintech startup building a cross-border lending marketplace connecting emerging-market financial institutions (seeking foreign-currency funding) with lenders in developed markets. Think of us as connecting Tier 1/2 banks in Africa/Asia with mid Tier lenders in the UK and Europe and China. We are pre-revenue, validating product-market fit with anchor users, and now ready to build the MVP. This is a ground-floor opportunity to shape the technical foundation of a marketplace that could scale to billions in annual deal flow. LOCATION: United Kingdom (Remote, flexible hours) THE ROLE We need an experienced senior technologist to design the core architecture of our marketplace platform and ensure a junior/mid-level UK engineer can execute the MVP independently. You will own six concrete deliverables over 12 weeks:...

About The Role What if your years of software engineering experience could directly shape how AI writes code for millions of developers? We're looking for Software Engineers in London to evaluate, rank, and refine AI-generated code — helping the next generation of coding assistants produce solutions that are correct, efficient, idiomatic, and production-ready. Your deep understanding of software architecture, design patterns, and real-world engineering trade-offs is exactly what AI models need to get better. This isn't about writing boilerplate — it's about applying expert judgment to push the boundaries of what AI can do with code. This is a fully remote, flexible contract role built for experienced developers who want meaningful, high-impact work on their own schedule. Organization: Alignerr Type: Hourly Contract Location: Remote Commitment: 10–40 hours/week What You'll Do Review and rank AI-generated code solutions across...