1 to 25 of 268 Open Source Jobs in the UK

Get paid to write open-source software Do you want to work on software used by billions around the world? Do you believe in the goals of the open-source software community? This team wants to hear from you. You will be working alongside similarly enthusiastic and highly skilled developers building software with open-source projects and making important contributions to the open-source community. You could be working on improvements to WebKit, or building new Linux kernel driver, or one of countless other projects this team tackles, all of them deeply technical. Requirements: • Knowledge and interest in developing systems level software such as kernel drivers, web rendering engines, display servers, or … A/V libraries. • Demonstrable and significant contributions to open-source projects. This includes engagement with the community and understanding of open-source development methodologies not just code commits. • High level of skill in C. Additional knowledge of Rust would be beneficial. • A Computer Science degree or similar experience. You will be working in a globally More ❯

The Company Our client is one of the fastest-growing software companies in Europe and is the publisher of a popular Open-Source operating system. Their aim is to help the enterprises welcome open source from end to end, across every category of compute and application, starting with infrastructure solutions such as Kubernetes, OpenStack, Data Analytics … an established supplier to many of the world's top Telecoms Service Provider's like BT and AT&T and their use cases span 5G Core, 5G Edge and Open RAN. The Opportunity In this hunter sales role. The qualified candidate will have the responsibility to attain the given annual quota. You are expected to successfully prospect accounts for … new business, sustain an existing territory, and work with colleagues on account strategy. You must be easily selling open source, cloud, virtualization, and technical software solutions to all levels of the enterprise. Key Responsibilities: Surpass annual and quarterly bookings target for services and subscriptions Yearly bookings goal $1.5 million + Represent the company, its software and solutions, for More ❯

the desktop and data centre. 'Wherever Computing Happens', we need to enable Arm by providing software solutions that interface higher-level software stacks with the hardware itself. Responsibilities: Our Open Source Software group is enabling new Arm architecture in projects such as kernel, firmware, system control and driver development, for a variety of target markets. Software on Arm … As well as the technical work of writing patches to implement new functionality, improve performance and enable new Arm architecture, you will enjoy working as part of the wider open source community. Required Skills and Experience: Proficient C programmer Desire and ability to work as part of a team Passion for open source development "Nice To … Have" Skills and Experience: Armv8-A Architecture Arm64 assembly language Experience of open source working practices Knowledge of Android, Linux kernel, driver development, security, cryptography In Return: Our UK offices are amazing places to collaborate. We also have some scope to adapt the job role and title for the right person - if you are interested but unsure whether More ❯

the core of our platform: our distributed database engine, integrated AI capabilities, and high-availability solutions. This role sits at the intersection of distributed systems, OLTP, high availability, and open-source innovation. You will contribute to the product direction for our scalable distributed architecture, our core MariaDB-based OLTP server, and our synchronous high-availability offerings powered by … of the developer and the enterprise architect, translating complex challenges into a product roadmap that pushes the boundaries of what a database can do. You will collaborate with the open-source community and provide key product support for our core MariaDB-based OLTP server. Your work will empower organizations worldwide to build resilient, high-performance applications. Key Responsibilities … content, product demos, and sales enablement materials that clearly articulate our value proposition. Community & Ecosystem Collaboration: Serve as a technical product expert. Collaborate with developer relations to support our open-source community, gathering feedback and representing their needs to inform the product roadmap. Cross-Functional Alignment: Ensure alignment across engineering, marketing, sales, and support, communicating progress and dependencies More ❯

s your chance to take full ownership of frontend projects from design to delivery with minimal supervision! About Ballerine Ballerine is a high-growth, early-stage startup building an open-source platform for identity verification and risk management in the financial sector. It’s a fast-paced team preparing for Series A funding — and looking for a Senior … in React, TypeScript, modern frontend frameworks and architectures • Strong understanding of state management, performance optimization, and scalable component-driven design • Experience with testing frameworks (Jest, Cypress, Playwright) • Comfort with open-source principles and contributions • Clear, confident communication in English (minimum C1, no heavy accents) • Ability to onboard quickly and deliver at startup pace • Proactive, independent, and ownership-driven … Chance to join a core team pre-Series A, shaping the product and the company’s direction • Work on complex, high-scale challenges with cutting-edge tools (LLMs, AI, open-source) • A culture where your voice matters — small team, high impact, no bureaucracy • Opportunities for technical leadership and direct influence on strategy • Fully remote role Responsibilities • Architect, develop More ❯

and Bristol, our UK offices are where emerging talent contributes to global innovation. Whether you're helping to shape the next generation of processors or building tools used across open-source communities, the work you do here will have real-world impact from day one. Our roots in the UK run deep and so does our commitment to … the UK. I wanted to join Arm to grow at a company tackling some of the most exciting challenges in tech, in an inclusive and welcoming environment. Working on open-source projects has been a rewarding challenge - learning how to contribute on behalf of Arm and meet the high standards these projects demand. Intern, based in Manchester Graduate … looking for more than just technical ability. At Arm, we want individuals who are curious, collaborative, and motivated to learn. Whether you're experimenting with side projects, contributing to open-source work, or stepping outside your comfort zone, we value candidates who bring initiative and creativity to everything they do. "I'd recommend checking out the blogs on More ❯

empower developers to rapidly build and test their cloud applications, allowing for a more enjoyable dev experience, and saving valuable time and resources. LocalStack has a large and active open-source community (57k+ stars on GitHub) with over 100k active users worldwide and 290M+ downloads to date. Our customer base ranges from SMBs to Global Fortune 500 companies. … GCP), ideally working with big data or database services. Strong programming skills in Python (Java a plus); familiarity with TypeScript or Go is (nice to have.) Experience contributing to open source or working with communities to gather feedback, triage issues, and guide contributors. (Nice to have) Fully remote Competitive salary Performance bonus Competitive share options Annual company retreat … redefining how developers interact with cloud platforms. By joining our team, you'll have the opportunity to: Lead a critical engineering function in a fast-growing company with huge open source traction and global customer base. Work on cutting-edge technology with a talented and passionate team. Shape the evolution of a product used and loved by thousands More ❯

APIs, DevOps and Microservices - and what we like to call Digital Integration. Our expert IT integration services include consulting, development, delivery, support and resourcing. Our consultants have experience of open-source andbest-of-breed technologies. Integrella has been in the integration business for years - so can help with all aspects of integration, strategy, design, implementation. Using open source technology or partnering with all the best suppliers in the industry, we are completely vendor neutral, and work with our customers to find the best solutions for them. Job Description This is a remote position. We are seeking a dynamic Quality Assurance (QA) Engineer that is comfortable working both hands-on in our product engineering teams delivering … implement data sharing solutions and build digital products as part of their digital strategy. We advise and deliver on all aspects of product engineering, strategy, design, and implementation. Using open-source technology or partnering with all the best suppliers in the industry, we are completely vendor neutral, and work with our customers to find the best solutions for More ❯

creativity, precision, and a shared obsession with what’s next. You’ll be part of a team shaping the future of Agentic AI - architecting and scaling a next-gen open-source framework that powers autonomous systems across industries. We're not just talking innovation - we're building it. Fast . Startup inside Kyndryl: Zero bureaucracy. You’ll work … equally — ideas over titles. What You’ll Do Serve as the bridge between deep technical work and business transformation, solving meaningful challenges through Agentic AI. Work on a modular, open-source Agentic AI framework - integrating GenAI and real-world tools. Develop, train, and deploy intelligent agents using tools like Python, Azure ML, focused on dynamic, self-improving systems. … e.g., microservice ecosystems, message brokers) Plus, You Bring Ability to operate independently and collaborate within a high-trust, low-hierarchy team Contributions to academic/technical communities and shaping open-source projects Bonus Points For Certifications in Azure, AWS, or Google ML platforms Demonstrated contributions to graph theory, DevOps, or distributed systems Previous projects involving digital transformation, AI 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 ❯

X Days a week, Plymouth 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 ❯

opportunity to create a more cohesive, integrated, and managed AI development life cycle to enable the building and maintenance of our AI systems. Our teams make extensive use of open source technologies such as, Kubernetes, Kubeflow, KServe, Argo, Buildpacks, and other cloud-native MLOps technologies. From technical governance to upstream collaboration, we are committed to enhancing the impact … and sustainability of open source. Join the AI Group as a Senior ML Platform Engineer and you will have the opportunity to: Architect, build, and diagnose multi-tenant AI platform systems Work closely with AI application teams to design seamless workflows for continuous model training, inference, and monitoring Work with AI experts to understand workflows, pinpoint, and resolve inefficiencies … and to inform the next set of features for the platforms Collaborate with open-source communities and AI application teams to build a cohesive MLOps experience Design CI/CD automation frameworks that incorporate regulatory requirements Develop cloud-native deployment patterns for AI systems across environments Troubleshoot and debug user issues Provide operational and user-facing documentation We More ❯

the user experience, drive product growth, establish best practices, and integrate cutting-edge AI capabilities. ️ Your responsibilities Design and develop robust and scalable generative AI services using Python and open source frameworks such as Writer Agent Builder, LangChain, and n8n. Implement responsive and user-friendly frontend interfaces, leveraging technologies like React, TypeScript, and modern web frameworks. Work with … databases as Elastic, Pinecone, Weaviate, or similar. Familiarity with cloud platforms (AWS, GCP, etc.) and containerized environments (Docker, Kubernetes). Familiarity with MCP, devtools, AI agents, or contributed to open source You are committed to writing clean, maintainable, and scalable code, following best practices in software development. You enjoy solving complex problems and continuously improving the performance and … closely with cross-functional teams to build impactful features. Proven ability to help teams adopt technical best practices. Note: . 5 years experience is minimum experience, but we are open to seniority (Senior, Staff, Senior Staff, etc). Benefits & perks (UK full-time employees): Generous PTO, plus company holidays Comprehensive medical and dental insurance Paid parental leave for all More ❯

Overview stackable - who are we? Stackable is an innovative technology company focused on delivering cutting-edge, opensource Big Data solutions for data lakehouses, data mesh, event processing and AI. We specialise in designing, deploying, and managing scalable datainfrastructures that empower businesses to harness the power of data effectively. Our core product, the Stackable Data Platform, enables companies of all sizes … mission at stackable: We are looking for a skilled Solutions Architect with a strong background in Big Data to join our team. The ideal candidate will have expertise in open source Big Data technologies and Kubernetes and DevOps practices . This role will be instrumental in designing, implementing, and optimizing cloud-based and on-premise data solutions for … Working either remote or onsite with our customers from UK A technology-focused start-up culture Choice of development tools The chance to shape a sustainable and future-oriented open source product Our engineering mindset: our aim is make bring architectures and software available in the most automated, maintainable and robust way possible! Diverse training opportunities and social More ❯

to Work" please feel free to ask us about the access to work scheme. Desirable Skills Experience using Azure OpenAI and foundational LLMs for Retrieval-Augmented Generation (RAG), including open-source implementations. Experience with LLM architecture (e.g., Transformer, GANs, VAEs), Fine-tuning PEFT/LoRA, Context embedding, Vector database technologies, and Semantic Search techniques & tools. Familiarity with Azure … Python libraries (e.g., PyPDF, Camelot) and OCR tools like Azure Document Intelligence or AWS Textract. Awareness of emerging InsurTech innovations, with the ability to propose creative solutions and adapt open-source models and technologies. What We Will Offer You Recognised and rewarded for a job well done, we have a range of flexible benefits for you to choose More ❯

code through rigorous testing and code review processes. Contribute to cross-platform development (Windows, Linux, Android, iOS, Mac) using CMake. Utilize unit testing frameworks like GTest/Catch and open-source libraries such as Boost and OpenCV. Work with .NET Core and Restful API, and proficiency in scripting languages like Python. Implement complex object-oriented patterns, public interfaces … What We're Looking For: Proven experience in software development in a commercial environment. Strong proficiency in modern C++ development and cross-platform development. Familiarity with unit testing frameworks, open-source libraries, and code review processes. Working knowledge of .NET Core, Restful API, and scripting languages. Passion for problem-solving and a commitment to continuous improvement. Experience in More ❯

Design, develop, deploy, monitor, and fix the data services and pipelines you build. Contribute to the development of pipelines and services that ingest, transform, and expose multilingual, multi-format open-source data. Work cross functionally with product managers, data scientists, investigators, and sanctions experts, translating fuzzy problems into clean, testable code. REQUIRED QUALIFICATIONS: 3-6+ years of … Docker, Kubernetes, and implementing CI/CD pipelines for data workflows. Familiarity with graph databases such as Neo4j, Memgraph, or a triple store Search experience, particularly in tools like Open/ElasticSearch, Lucene, Vector search (Pinecone, postgres Vectors, etc) to support complex data relationships and querying needs. Kharon is a highly disruptive and incredibly innovative organization that navigates risk … businesses perceive and navigate global risks. Reporting to the Data Engineering Manager , this Software Engineer will support and enhance the reliability of our research and analysis platform, which leverages open-source intelligence, data mining, network analysis, and machine learning to generate unparalleled insights on networks engaged in illicit financial activity. Key focus areas include system architecture, code quality More ❯

a general or development specific genre, or a willingness to work towards it. The post holder will be able to demonstrate the following knowledge, skills, and experience: Proficient in Open-source technologies such as TypeScript, JavaScript, Java, PHP, HTML, and CSS within Open-source environments. A sound understanding of value-based delivery and planning and ability More ❯

a general or development specific genre, or a willingness to work towards it. The post holder will be able to demonstrate the following knowledge, skills, and experience: Proficient in Open-source technologies such as TypeScript, JavaScript, Java, PHP, HTML, and CSS within Open-source environments. A sound understanding of value-based delivery and planning and ability More ❯

a general or development specific genre, or a willingness to work towards it. The post holder will be able to demonstrate the following knowledge, skills, and experience: Proficient in Open-source technologies such as TypeScript, JavaScript, Java, PHP, HTML, and CSS within Open-source environments. A sound understanding of value-based delivery and planning and ability 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 ❯

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 ❯

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 ❯

responsibilities Define and champion the technical strategy for services, ensuring alignment with user needs and business goals Lead technical specialists across multiple projects, solving architectural challenges. Design and assure open-source, user-centred systems in agile environments. Own the technical design and evolution of services, including integration and interoperability. Provide technical governance and present designs to boards such … governance boards and ensuring alignment with standards. Previous or current experience developing web services using Python/Django and/or NodeJS/React with knowledge of cloud technologies, open-source technologies and secure system design. Proven leadership in guiding technical teams, delivering user-focused services in agile environments and communicating complex concepts to varied stakeholders. Desirable skills More ❯