46 software engineer jobs found

Java Software Engineer (contract outside of IR35) About Us   In 2019, the founders were working as engineers solving complex cross-domain problems within government organisations.   TwinStream was formed to bring together their collective expertise and experience into a single business, focused on delivering technical excellence and high-quality service to clients.   Since then, the company has grown to over 100 team members across the UK, with colleagues working both on-site with clients,  hybrid  and remotely from home.     Details:    3-month (rolling) contract outside of IR35 Rate: £500 - £600 per day /    Location: Remote, with potential travel to the Bristol office in the future. Security: BPSS   About the role:    TwinStream software engineers (Java) develop components of a...

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...

Software Engineer – Ruby (AI Training) About The Role What if your Ruby expertise could directly influence how AI writes and understands backend code for developers around the world? We're looking for experienced Ruby Software Engineers to work on real-world software systems that power data-driven and AI-supported workflows — reviewing, building, and evaluating production-grade code that helps train the next generation of AI models. This is a fully remote, flexible contract role. Work asynchronously on your own schedule, take on as many hours as suits you, and make a tangible impact on how AI reasons about software engineering. Organization: Alignerr Type: Hourly Contract / Task-Based Location: Remote Commitment: 10–40 hours/week What You'll Do Develop and maintain backend services and APIs using Ruby and Ruby-based frameworks Review and analyze existing codebases for correctness, performance, and maintainability...

Software Engineer - Quantitative Decision Systems Experienced Junior to Mid-Level Location:  Remote, London-based Engagement:  Initial contractor, intended to convert to permanent Indicative contract rate:  GBP 350-550/day; target c. GBP 450/day Indicative permanent salary:  GBP 55,000-80,000 Reporting to:  Naverion Chief Technical Officer (CTO)   Role Summary Naverion is seeking a software engineer at experienced-junior to mid-level to deliver defined components across its quantitative decision platform. Working directly with the CTO, the engineer will implement, test, document and support the controlled release of production software. The role suits someone who can progress bounded work independently and, at the upper end of the range, own defined components through the full SDLC. Architecture, methodology, clinical interpretation, security design and production approval remain with the CTO and relevant...

Contract Software Engineer - WebCompat Tooling (Dashboards and Reporting), Firefox The role You will build and improve the WebCompat team’s internal tooling, the dashboards and the broken-site-report screenshot pipeline the team relies on to triage and prioritize site breakage. This is a focused tooling role that makes the WebCompat program faster and more data-driven. Responsibilities Build and improve WebCompat dashboards (triage, reporting, and metrics). Improve the broken-site-report screenshot capture and pipeline. Work with the WebCompat team (including QA) to turn reporting and triage needs into reliable tooling. Required qualifications Solid web development (JavaScript, HTML, CSS, Python & Django) and experience building dashboards / data views. Comfort with tooling, automation, and web services. Self-directed, with good written communication. Preferred Familiarity with WebCompat workflows and Bugzilla....

Job Summary We are seeking a dynamic and passionate Software Engineer to join our innovative development team! In this role, you will play a vital part in designing, developing, and maintaining cutting-edge software solutions that drive our business forward. Your expertise will help craft scalable applications, integrate APIs, and optimize system performance across various platforms. This is an exciting opportunity for someone eager to work with a diverse tech stack and contribute to impactful projects in a fast-paced environment. If you thrive on solving complex problems with code and enjoy collaborating with talented professionals, we want to hear from you! Duties Develop, test, and deploy robust software applications using languages such as JavaScript, Java, C#, Python, C++, Ruby on Rails, C, and VBA. Collaborate with cross-functional teams to gather requirements and translate them into technical specifications for application development. Design and...

We 're looking for experienced software engineers to build AI coding tasks from a codebase they know well. $750 Pounds per task, and you can do as many tasks as you want. You turn a real change from a repository you know into a task that today 's best AI coding models struggle with: hard for the models, but fair for a skilled engineer. Your tasks are used to measure and train AI coding models. Remote, any location. $750 Pounds per task that passes review. Minimum of one task a week, about 10 hours a week.   How it works Apply. Complete a short screener interview and upload your resume. Propose. Once you 're selected, pick a change from a repository you know and submit a short proposal. We approve it or suggest a better candidate. Build. In our platform, set up the repository as it was before the change, then write the brief, the correct solution and the grading checks. Stress-test. Try lazy, incorrect and shortcut solutions and make sure...

About The Role Alignerr is building a dataset of expert tasks that train and evaluate advanced AI agents on real enterprise engineering work. As a Task Author, you will design and calibrate authentic engineering challenges — diagnosing failing integrations from logs, tracing bugs through codebases, and writing and verifying real fixes — that genuinely push the limits of capable AI agents. London's engineering scene spans fintech, enterprise SaaS, and deep-tech — and this role is built for engineers who operate in that world. If you debug real systems, write infrastructure code, and understand what a production failure actually looks like, your expertise is exactly what we need. Organization: Alignerr Type: Hourly Contract Location: Remote Commitment: Flexible, task-based Key Responsibilities Author realistic engineering task prompts covering integration failures, log-based debugging, bug traces through source code, and...

About the Role What if your precision with YAML configurations and structured data could directly influence how AI systems understand and operate in the real world? We're looking for detail-oriented Software Engineers to review, author, and evaluate YAML-based configurations and workflows — helping ensure the AI systems powering tomorrow's technology are built on a solid, reliable foundation. This is a fully remote, flexible contract role designed for engineers who love working close to the metal — configuration files, schemas, and system logic are your natural habitat. Organization : Alignerr (Powered by Labelbox) Type : Hourly Contract Location : Remote Commitment : 10–40 hours/week What You'll Do Author, review, and maintain YAML files used for configuration, data pipelines, and system definitions Ensure YAML structures are accurate, well-organized, and compliant with required schemas Identify formatting issues,...

About The Role What if the code you write could directly shape how the next generation of AI understands and generates software? We're looking for Software Engineers in London to build, evaluate, and improve AI-generated code — helping train AI systems to think like real developers. You'll write solutions, review AI outputs, and provide the expert-level feedback that makes AI coding assistants smarter, safer, and more reliable. This is hands-on engineering work at the frontier of AI development — not theoretical, not bureaucratic, and not boring. This is a fully remote, flexible contract role. If you can write clean code and explain your reasoning, we want to hear from you. Organization: Alignerr Type: Hourly Contract Location: Remote Commitment: 10–40 hours/week What You'll Do Write, debug, and optimize code across a range of languages, frameworks, and problem domains Review and evaluate AI-generated code for correctness,...

Job Title: Software & DevOps Engineer Location: London Hybrid Duration: 12 months Contract Start Date: November, ASAP Day Rate: Competitive (Inside IR35)   Deloitte Working with the Deloitte Associate (Contractor) Programme means we can offer you the opportunity to work on a variation of industry and client related projects. Our aim is to retain the best talent and so when your project end date nears our team of Talent Community Advisors will be working with you to look at alternative projects within the firm that suit your experience should you wish to continue with Deloitte.   The Role This role requires a senior software engineer specializing in Java and JavaScript development to design, build, and secure enterprise-level applications and platforms. The consultant will be a key figure in enhancing software supply chain security and driving the adoption of secure development practices across the software...

This is a  contractor/freelancer  opportunity, and work is compensated based on tasks performed. Currently, we are only accepting applications from candidates in the countries  on our website , and require that resumes be submitted in English. What Interview Engineers do: Interview Engineers facilitate technical interviews with software developers around the world. As an Interview Engineer, you will create inclusive hiring processes by mitigating bias, improving hiring signals, and completing objective evaluations. These skills are critical to hiring and managing teams in startups and large enterprises. As a Karat Interview Engineer, you will: Interview— Facilitate an interview through Karat's platform. Create an enjoyable candidate experience while you evaluate a candidate's fundamental coding skills and technical knowledge. Evaluate— Provide input on the candidate's performance, coding style, communication skills,...

Location: UK Remote (GMT timezone) Department: Engineering Employment Type: Contract (B2B)   About YLD: Our goal is to help our clients keep moving forward. We work with them to build the skills and capabilities they need to stay ahead of the competition, and we know our success only happens when they succeed. We’re a team of curious, talented people, and we’re committed to making YLD a place where great people want to work, grow, and stay. We’re a remote-first consultancy specialising in software engineering, product design, and data. Our teams are based across London, Lisbon, and Porto, and we create digital solutions that continue to deliver value long after our work is done.   About the role As a Senior Software Engineer at YLD, you’ll be part of a client team building innovative products. We’re looking for someone curious, passionate, driven, and enthusiastic. You should be skilled in...

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: Technical architecture document – technology stack, system design, rationale Development framework – Git...

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 across Bristol and the wider UK 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...

Machine Learning Engineer (AI Data Trainer) About The Role What if your expertise in machine learning could directly shape how the next generation of AI systems reason, plan, and solve real-world problems? We're looking for Machine Learning Engineers to work at the frontier of AI development — capturing the step-by-step reasoning and decision-making processes that teach large language models to think more reliably. This is a fully remote, flexible contract role built for technical minds who can break down complex logic and communicate it with precision. You won't just observe how AI is trained — you'll be a core part of making it smarter. Organization: Alignerr Type: Hourly Contract Location: Remote Commitment: 10–40 hours/week What You'll Do Author clear, structured reasoning traces that document how an AI should plan and execute complex technical tasks Map out step-by-step decision-making processes — including tool...

Lead DevOps Engineer (Contract, Outside IR35) Contract:  Outside IR35 Start date:  December 2026 Length:  Three months initially, with a chance to extend Location:  Remote first, based within 50 miles of Edinburgh, Newcastle, Leeds, Manchester or London A lot of DevOps contracts drop you into someone else's setup and ask you to keep it running. On this one, you'll decide how it's built. What's in it for you You'll lead the DevOps work from day one, with the authority to make decisions and see them through. You'll join a team that already knows what good looks like, so you won't spend your first month untangling things. Who you'll be doing it for You'll be working for hedgehog lab, a digital product consultancy with 20 years of experience. We're around 100 people, B Corp and Great Place to Work certified, and backed by a growth capital investor. Your clients will be public and private sector organisations going through digital...

The Cabinet Office supports the Prime Minister and ensures the effective running of government. The Cabinet Office is also the corporate headquarters for the government, in partnership with HM Treasury, and takes the lead in certain critical policy areas. More information about the Cabinet Office can be found on its website at: www.gov.uk/government/organisations/cabinet-office   As a Lead Data Engineer AI , your main responsibilities will be: AI Data Integration & Pipeline Design: Establish Cabinet Office data integration standards and lead the engineering of automated data pipelines, ETL/ELT workflows, and API connections connecting enterprise SaaS and internal databases to AI applications whilst ensuring alignment with existing pipelines and standards. AI Data Security & Compliance: Implement identity and access controls, including SSO, conduct data quality, sensitivity and access checks before indexing, and ensure AI applications respect...

  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 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...