1 to 25 of 27 Contract Open Source Jobs in England

Senior Front End Developers - Government, Open-source, HTML, CSS, JavaScript, TypeScript, NodeLS, SQL, API, Cloud base, Hybrid, Newcastle or Leeds Our client within the public sector is looking for an experienced Senior Front End Developer to join a dynamic team dedicated to delivering accessible, high-quality digital services. You will lead the development of reusable UI components and … create consistent, efficient solutions that serve a wide range of users across multiple devices and browsers. Key requirements include significant experience in large-scale Front End development, proficiency with open-source tools and frameworks, and a strong understanding of integrating Front End systems with Back End services in cloud environments such as AWS or Azure. You should be … passion for innovation, quality, and continuous improvement. Key experience includes: Significant experience in large-scale Front End development for systems with high user loads and complex processes. Proficiency with open-source tools and frameworks such as HTML, CSS, JavaScript (client and Server Side), TypeScript, and modern Front End frameworks. Proven ability in delivering comprehensive unit testing using frameworks More ❯

RAG Systems ( Security Clearance Essential ) Clearance: Active SC Essential | Sector: Defence Role Overview Defence client requires an SC Cleared AI Engineer to build fully on-premises RAG systems using open-source technologies. You'll develop classified AI capabilities on air-gapped infrastructure with zero external dependencies. Key Responsibilities - Build end-to-end RAG pipelines on isolated defence networks … using open-source LLMs (Llama 3, Mistral, Qwen) - Deploy local vector stores (Chroma, FAISS, Milvus) with sensitive document ingestion pipelines - Host and optimise LLMs using vLLM/TGI on local GPU clusters without internet connectivity - Implement agent orchestration using LangChain/LangGraph in completely offline environments - Design secure document processing for classified materials with appropriate data sanitisation - Build … monitoring and evaluation systems that operate within air-gapped infrastructure Essential Requirements - Active SC Clearance (non-negotiable) - willingness to undergo DV if required - Demonstrable experience deploying open-source LLMs (Llama, Mistral, Falcon) on-premises - Expertise with local vector databases (Chroma, FAISS, Weaviate) in offline deployments - Strong vLLM/Text Generation Inference experience for high-throughput model serving - Proven More ❯

solution architecture (cloud & on-prem). Develop and deploy ML models into production. Identify AI opportunities aligned with business processes Prototype, test, and optimize AI applications. Stay current with open-source AI/ML frameworks. Communicate AI capabilities and set realistic expectations. Essential Skills & Experience Strong expertise in GenAI, NLP, and ML. Hands-on experience with LLMs/… SLMs, Python, Java, SQL/NoSQL. API development, web scraping, data integration. On-prem AI model deployment, open-source frameworks (e.g. Hugging Face, LangChain). Strong consulting and communication skills. Preferred Knowledge of data structures, algorithms, and solution architecture. Experience with cloud AI platforms (AWS, Azure, GCP). Broad ML knowledge and prior consulting with international teams. Refer More ❯

databases, and Python-based solutions. Prototype and test AI applications, optimizing performance and scalability. Apply backend/data processing skills to handle structured and unstructured datasets. Stay current with open-source AI/ML frameworks (e.g., Hugging Face, LangChain) and apply them to business needs. Communicate technical concepts clearly to technical and non-technical stakeholders. Essential Skills & Experience …/SLM). Proficiency in Python (Pandas, NumPy, Scikit-learn, PyTorch/TensorFlow). Experience with SQL/NoSQL databases, APIs, and data integration. Exposure to on-premise/open-source AI frameworks. Strong problem-solving and communication skills. Preferred Knowledge of data structures, algorithms, and solution architecture. Familiarity with cloud AI platforms (AWS, Azure, GCP). Understanding More ❯

React and Typescript/Open-Source Software Engineer to join our talented & recently formed creative team. Based in Manchester and fully remote, the team are designing and developing the next generation containerised IT infrastructure. This React and TypeScript Software Engineer opportunity is deeply technical, and we want someone with solid Python or TypeScript experience and a thirst to … peer code review. Any exposure to Angular front-end tech is highly advantageous. Are you excited about Golang, Jenkins, Dockers, Kubernetes, architecture, test driven development, API's and everything open source? Then I'd love to hear from you. Superb environment, office, tech stack and ability to learn from one of the greatest in the industry. Please apply More ❯

relation to trading standards and online consumer protection. Gather and handle digital evidence in line with legal and forensic standards. Carry out online inspections, research, and intelligence gathering using open-source techniques. Provide evidence in criminal or civil proceedings. Contribute to safeguarding and welfare responsibilities. Additional responsibilities by grade: Grade G: Apply advanced online research techniques and intelligence … to analyse information from multiple sources. Good written and spoken communication skills, including the ability to give evidence in court. Grade progression requires: Training and/or certification in open-source investigation, intelligence gathering, and enforcement procedures (e.g. RIPA/IPA). Increasing knowledge of legislation, digital forensics, and online investigation techniques. Demonstrable experience in trading standards or More ❯

scale, data-driven applications Product-focused approach, ideally within fast-paced tech organisations (start-ups or scale-ups) Knowledge of Kafka, Cassandra, gRPC, and microservices is a strong advantage Open-source contributions are beneficial If you're a Senior Go Developer looking for a challenging 6-month contract with a forward-thinking tech company, apply today. We are More ❯

logging) Confident debugging and resolving issues in complex distributed systems Product-oriented mindset with a collaborative approach to improving developer experience Bonus: experience with Kafka, gRPC, or contributing to open-source projects If you're a Senior Platform Engineer who thrives on building tools and systems that empower developers and accelerate delivery, apply today. The client is looking More ❯

core parts of the platform. You'll take ownership across the full development lifecycle, from system design and implementation to optimisation and release. You'll be working in an open, fast-moving environment where ideas get tested quickly and good engineering practices are taken seriously. If you like seeing your work go live within days - not weeks - you'll … and familiarity with working in technology-driven organisations or start-ups Experience with Kafka, Cassandra, gRPC, and microservices architecture will also be beneficial, as well as experience contributing to open-source projects If you're a Senior Go Developer looking for a fast-paced, collaborative contract role where your work will ship quickly and matter to real users More ❯

to security threats. As a Cyber Security Engineer your main responsibilities will be to: . Design, deploy, and manage the security platforms, including the SIEM (eg, Splunk, Microsoft Sentinel & Opensource alternatives) and supporting infrastructure across hybrid cloud environments. . Monitor platform performance, troubleshoot issues, and implement optimisation to ensure high availability and data integrity. . Configure and maintain data pipelines More ❯

improvement in performance testing practices. What we're looking for: 5+ years' experience in non-functional/performance testing for large-scale applications. Hands-on experience with Gatling and open-source performance tools. Strong knowledge of CI/CD tools (Jenkins, GitHub Actions, Gradle/Maven). Skilled in monitoring/logging with Prometheus and Grafana. Proficiency in More ❯

Experience : Significant demonstrable expertise in Front-end development of large-scale systems dealing with high numbers of users, transactions and business processes. Detailed working knowledge and extensive experience of open-source technologies including HTML, CSS, client and server-side JavaScript, TypeScript, Node.js and other modern front-end frameworks and templating languages. Experience in building accessible compliant user interfaces More ❯

of components.Delivery end to end testing using TDD and BDD. Essential: Expertise in Front-end development of large-scale systems dealing with high numbers of users Extensive experience of open-source technologies including HTML, CSS. Extensive use of server-side JavaScript, TypeScriptNode.js and other modern front-end frameworks and templating languages. Experience with Public Sector/DWP would More ❯

Requirements Significant demonstrable expertise in Front End development of large-scale systems dealing with high numbers of users, transactions and business processes. Detailed working knowledge and extensive experience of open-source technologies including HTML, CSS, client and Server Side JavaScript, TypeScript, Node.js and other Front End frameworks. Experience in building accessible compliant user interfaces (WCAG). Proven ability More ❯

Requirements Significant demonstrable expertise in Front-end development of large-scale systems dealing with high numbers of users, transactions and business processes. Detailed working knowledge and extensive experience of open-source technologies including HTML, CSS, client and server-side JavaScript, TypeScript, Node.js and other front-end frameworks. Experience in building accessible compliant user interfaces (WCAG). Proven ability More ❯

Plan, Provide & Assure functions Own development and solution architecture targets and roadmaps Allocate tickets to squads and support sprint shaping Provide strategic updates to key stakeholders Explore new libraries, open-source tools, and frameworks to drive efficiencies Mentor and develop teams, arranging training where appropriate Promote data-driven decision-making and agile planning Deliver synergies across both fixed More ❯

Plan, Provide & Assure functions Own development and solution architecture targets and roadmaps Allocate tickets to squads and support sprint shaping Provide strategic updates to key stakeholders Explore new libraries, open-source tools, and frameworks to drive efficiencies Mentor and develop teams, arranging training where appropriate Promote data-driven decision-making and agile planning Deliver synergies across both fixed More ❯

of Kotlin/Java Strong knowledge of Android SDK, Android UI design principles, patterns, and best practices Experience with offline storage, threading, and performance tuning Awesome knowledge of the open-source Android ecosystem and the libraries available for common tasks and benchmarking and optimisation Proficient in Google's Android design principles, interface guidelines and code versioning tools, such More ❯

experience with Python, Java, SQL/NoSQL databases · Have experience with API development, web scraping/crawling, and data integration · Practical exposure to on premise AI model deployment and open-source AI frameworks · Be consultative · Ability to assess AI tools and recommend optimization for performance improvements · Maintain strong communication skills Please apply for more information on this great More ❯

Python development skills. Integrating with SQL/NoSQL databases. Experience with API development, web scraping/crawling, and data integration. Practical exposure to on premise AI model deployment and open-source AI frameworks (e.g., Hugging Face, LangChain.) Ability to assess AI tools and recommend optimization for performance improvements. Strong consulting and communication skills able to translate technical concepts More ❯

income, derivatives) Experience with distributed computing frameworks (e.g., Spark, Dask) and cloud-native ML pipelines Exposure to LLMs, graph learning, or other advanced AI methods Strong publication record or open-source contributions in ML or quantitative finance Please apply within for further details or call on (phone number removed) Alex Reeder Harvey Nash Finance & Banking More ❯

Design and implement AI-powered solutions· Work with Python, SQL/NoSQL, and APIs for integration· Test AI applications· Improve performance through feature engineering· Explore and incorporate the latest open-source AI/ML tools into business solutions· Develop and deploy machine learning models · Solve business problems· Clearly communicate technical ideas and insights · Work with technical and non More ❯

and patching mechanisms. Experience in Agile software development and delivery. Active Directory, secure networks, and system hardening expertise. Knowledge of scripting with tools such as Python and working with open-source products. This PKI Architect role is ideal for someone who thrives in a collaborative, fast-paced environment and is committed to technical excellence. To apply, please send More ❯

AI agent frameworks such as Model Context Protocol (MCP) or LangChain. Exposure to large-scale software system architecture. Desirable: Direct experience in generative AI and LLM research. Experience with open-source AI libraries. Knowledge of SQL and database interaction. Hands-on experience with version control systems. More ❯

in Angular 14+, TypeScript, RxJS, JavaScript and AstroUXDS Skilled in CSS Grid/flexbox, HTML5/CSS3, Playwright and Cucumber Experienced in npm/nodeJS with general experience integrating open source npm packages to web-apps Experience in React, Vue, Svelte is beneficial Why join us Career coaching, mentoring and access to upskilling throughout your entire FDM career More ❯