1 to 25 of 1,286 Permanent Open Source Jobs in the UK

Anaconda is built to advance AI with open source at scale, giving builders and organizations the confidence to increase productivity, and save time, spend and risk associated with open source. 95% of the Fortune 500 including Panasonic, AmTrust, Booz Allen Hamilton and over 50 million users rely on the value The Anaconda AI Platform delivers through a … developers, and scientific thinkers - to understand their workflows and pain points Collaborate with the broader product organization to ensure seamless integration between Desktop and our enterprise platform Work with open-source communities to ensure our desktop product serves both individual developers and contributes to the broader Python ecosystem Define and track key product metrics including user engagement, feature … unique challenges of software distribution, updates, and cross-platform compatibility Technical background that enables you to engage meaningfully with engineering on complex architectural decisions Track record of working with open-source communities and understanding open-source business models Proven ability to balance multiple stakeholder needs while maintaining a clear product vision A PLG-oriented mindset, creating More ❯

AI Engineer Salary: £65,000 £80,000 Location: Fully remote We are seeking an AI Engineer with a strong open-source software background to join a fast-growing scale-up. They offer fully remote employment and have a team of engineers dedicated to developing AI-powered search and Retrieval-Augmented Generation (RAG) pipelines within DataStax-based architecture. This … role is perfect for someone with expertise in Open-source, API development, fine-tuning LLMs, and integrating AI into scalable applications. If you thrive in an AI-driven development environment, enjoy working on cutting-edge retrieval models, and have a passion for optimizing LLM performance, we want to hear from you. Key Responsibilities: Develop and maintain scalable RESTful … GraphQL APIs to interact with LLMs and AI-powered search systems. Design and implement Retrieval-Augmented Generation (RAG) pipelines using open-source tools like LangChain, Langflow, and DataStax Vector Search. Fine-tune LLMs (Hugging Face, OpenAI, Cohere, or similar) to improve response quality and domain-specific performance. Optimize embedding models for better semantic search and document retrieval. Integrate More ❯

We are looking for an experienced engineer who is passionate about developing compilers and managed runtimes and loves open-source software. In this role you will be working on performance analysis and optimisation across a range of runtimes. You'll be part of the bigger CE-SW Runtimes team, whose goal is to improve modern languages support on … the Arm architecture, from JavaScript to Rust. you will work closely with the team and colleagues across the organisation and with open source communities to tackle challenges in enabling the future of computing. Responsibilities Identify and implement changes to compilers and managed runtimes to improve the performance of selected workloads and better support Arm architectural features and CPU … fine-tune existing ones. (e.g. garbage collectors, interpreters, optimisation passes, intrinsics) Own and be accountable for medium/large technical areas of managed runtime or compiler development. Contribute to open-source software projects and engage with open-source community. Collaborate with colleagues across Arm to improve the support for the Arm Architecture and CPUs. Help develop More ❯

where developers collaborate to build the world's leading AI-powered developer platform. In the GitHub Code Scanning team, we are passionate about securing the world's software - both Open Source and Enterprise. We believe that the best way to secure software is to detect security issues early in the development process, and actively facilitate their remediation as … energy Deliver success Who We Are GitHub is the world's leading AI-powered developer platform with 150 million developers and counting. We're also home to the biggest open-source community on earth (and 99% of the world's software has open-source code in its DNA). Many of the apps and programs you … use every day are built on GitHub. Our teams are dreamers, doers, and pioneers, leading the way in AI, driving humanitarian efforts around the globe, and even sending open source to Mars (and beyond!). At GitHub, our goal is to create the space you need to do your best work. We're remote-first and offer competitive More ❯

recognition since 2021 demonstrates his unwavering dedication to knowledge sharing, community building, and technical innovation within the software development ecosystem. His contributions span multiple channels, from creating widely-adopted open-source security tools to producing educational content that reaches developers across the globe. Jamie's community impact is exemplified through The Modern .NET Show podcast , which serves as … including the United States (25% of all downloads), United Kingdom (15%), Canada (7%), and Asia (30%), providing accessible technical education to developers at all career stages. Technical excellence through open-source contribution forms another cornerstone of Jamie's recognition. His OwaspHeaders.Core library has achieved remarkable success with over 1.2 million downloads, providing essential web application security features to … responsibility," Jamie commented following the announcement. "It represents not just individual achievement, but a commitment to the broader developer community. Through RJJ Software, The Modern .NET Show, and my open-source contributions, I'm able to help organisations and developers alike realise their full potential using modern technologies." The MVP recognition enhances RJJ Software's position as a More ❯

part of a small, dynamic team Proven ability to pick up new tools and concepts quickly About Red Hat Red Hat is the world's leading provider of enterprise open source software solutions, using a community-powered approach to deliver high-performing Linux, cloud, container, and Kubernetes technologies. Spread across 40+ countries, our associates work flexibly across work … fully remote, depending on the requirements of their role. Red Hatters are encouraged to bring their best ideas, no matter their title or tenure. We're a leader in open source because of our open and inclusive environment. We hire creative, passionate people ready to contribute their ideas, help solve complex problems, and make an impact. Inclusion … at Red Hat Red Hat's culture is built on the open source principles of transparency, collaboration, and inclusion, where the best ideas can come from anywhere and anyone. When this is realized, it empowers people from different backgrounds, perspectives, and experiences to come together to share ideas, challenge the status quo, and drive innovation. Our aspiration is More ❯

C/C++ or Python Previous experience with container or virtualization environments Proven success working in a distributed environment Supplemental MySQL technologies Why Percona? At Percona, we believe an open world is a better world. Our mission is to enable everyone to innovate freely, by providing the best open source database software, support, and services. We make … databases and applications run better through a unique combination of expertise and open source software built with the community for you. Our technical teams are experts in MySQL, MongoDB, PostgreSQL, and MariaDB. Percona is proud to be a remote-only and globally dispersed workforce - we have colleagues in more than 50 countries! We offer a collaborative, highly-engaged … you love the idea of working with a high-growth tech company that is one of the best in the business and known globally as a leader in the open-source database space, let's talk! Connect with us and stay up to date on our latest news and developments by following us on LinkedIn and Twitter. We More ❯

leading global organisations — constantly pushing boundaries and finding smarter ways to deliver value. Innovation is at the heart of everything this team does. They explore the latest cloud platforms, open-source tools, and modern technologies to create solutions that are as inspiring as they are effective. You'll join a thriving community of specialists who take pride in … ensuring best practices and high standards throughout delivery. Contributing to proposals and client engagements, helping to define innovative and competitive solutions. Staying hands-on with modern cloud-native and open-source technologies, continually learning and exploring new ideas. This is an opportunity to influence outcomes at every level — guiding technology choices and shaping solutions that make a lasting … clearly, and enjoy seeing your designs come to life. Our client is looking for someone with: Strong, hands-on experience with AWS and building cloud-native solutions. Expertise in open-source frameworks , API-led design , and secure, scalable architectures. A deep understanding of microservices , domain-driven design , event-driven systems , and containerisation . Familiarity with architectural frameworks such More ❯

X Days a week Plymouth - willingness to undergo DV if required 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 - willingness to undergo DV if required 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 - willingness to undergo DV if required 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 - willingness to undergo DV if required 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 - willingness to undergo DV if required 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 ❯

Green Energy, and Industrial Automation. What You'll Bring Strong proficiency in C programming Experience with one or more of the following: C++, Python, Rust, or Java Familiarity with open-source technologies and ecosystems Solid understanding of modern software development practices Confident working within Linux environments About the Team You'll collaborate with a talented group of engineers … for technology and modern design. The role offers exposure to the full software development lifecycle - from concept and prototyping through to delivery and deployment. Experience with embedded systems and open-source development will be a significant advantage. We're Looking For Engineers Who Have a genuine passion for software development Enjoy working collaboratively with technical specialists Thrive on … variety - every project brings something new Desirable Experience Embedded software development Contributing to open-source projects CI/CD pipeline development and automation If you're ready to take on diverse challenges and shape cutting-edge software solutions, apply today with an up to date CV. Contact : Laurence Powell KO2 Embedded Recruitment Solutions Ltd More ❯

days per week in office) Maze is partnering with a stealth-mode startup that's rebuilding core banking from the ground up. They’re creating the world’s first open-source, AI-native "Thin Ledger"—set to replace legacy infrastructure at Tier 1 banks. We're looking for a Founding Site Reliability Engineer to drive the infrastructure behind … incident response AI-curious or AI-native: excited to build agent-powered ops Someone who is currently hands on (not someone primarily focused on strategy & people management) Passion for open-source, clean architecture Software Development experience (Bonus points for Go(Golang)) Bonus: background in financial systems, core banking, or regulated infra Why join: Huge ownership: build core infra … Work with a high-caliber team, fast-paced and product-minded founders who have worked in some of the most recognised tech businesses in the world. Help define an open-source platform from day one. Clear path to tech unicorn status with fruitful equity included. Recently raised 8 figures in funding. If your skillset matches, apply within. Please More ❯

days per week in office) Maze is partnering with a stealth-mode startup that's rebuilding core banking from the ground up. They’re creating the world’s first open-source, AI-native "Thin Ledger"—set to replace legacy infrastructure at Tier 1 banks. We're looking for a Founding Site Reliability Engineer to drive the infrastructure behind … incident response AI-curious or AI-native: excited to build agent-powered ops Someone who is currently hands on (not someone primarily focused on strategy & people management) Passion for open-source, clean architecture Software Development experience (Bonus points for Go(Golang)) Bonus: background in financial systems, core banking, or regulated infra Why join: Huge ownership: build core infra … Work with a high-caliber team, fast-paced and product-minded founders who have worked in some of the most recognised tech businesses in the world. Help define an open-source platform from day one. Clear path to tech unicorn status with fruitful equity included. Recently raised 8 figures in funding. If your skillset matches, apply within. Please More ❯

days per week in office) Maze is partnering with a stealth-mode startup that's rebuilding core banking from the ground up. They’re creating the world’s first open-source, AI-native "Thin Ledger"—set to replace legacy infrastructure at Tier 1 banks. We're looking for a Founding Site Reliability Engineer to drive the infrastructure behind … incident response AI-curious or AI-native: excited to build agent-powered ops Someone who is currently hands on (not someone primarily focused on strategy & people management) Passion for open-source, clean architecture Software Development experience (Bonus points for Go(Golang)) Bonus: background in financial systems, core banking, or regulated infra Why join: Huge ownership: build core infra … Work with a high-caliber team, fast-paced and product-minded founders who have worked in some of the most recognised tech businesses in the world. Help define an open-source platform from day one. Clear path to tech unicorn status with fruitful equity included. Recently raised 8 figures in funding. If your skillset matches, apply within. Please More ❯

days per week in office) Maze is partnering with a stealth-mode startup that's rebuilding core banking from the ground up. They’re creating the world’s first open-source, AI-native "Thin Ledger"—set to replace legacy infrastructure at Tier 1 banks. We're looking for a Founding Site Reliability Engineer to drive the infrastructure behind … incident response AI-curious or AI-native: excited to build agent-powered ops Someone who is currently hands on (not someone primarily focused on strategy & people management) Passion for open-source, clean architecture Software Development experience (Bonus points for Go(Golang)) Bonus: background in financial systems, core banking, or regulated infra Why join: Huge ownership: build core infra … Work with a high-caliber team, fast-paced and product-minded founders who have worked in some of the most recognised tech businesses in the world. Help define an open-source platform from day one. Clear path to tech unicorn status with fruitful equity included. Recently raised 8 figures in funding. If your skillset matches, apply within. Please More ❯

days per week in office) Maze is partnering with a stealth-mode startup that's rebuilding core banking from the ground up. They’re creating the world’s first open-source, AI-native "Thin Ledger"—set to replace legacy infrastructure at Tier 1 banks. We're looking for a Founding Site Reliability Engineer to drive the infrastructure behind … incident response AI-curious or AI-native: excited to build agent-powered ops Someone who is currently hands on (not someone primarily focused on strategy & people management) Passion for open-source, clean architecture Software Development experience (Bonus points for Go(Golang)) Bonus: background in financial systems, core banking, or regulated infra Why join: Huge ownership: build core infra … Work with a high-caliber team, fast-paced and product-minded founders who have worked in some of the most recognised tech businesses in the world. Help define an open-source platform from day one. Clear path to tech unicorn status with fruitful equity included. Recently raised 8 figures in funding. If your skillset matches, apply within. Please More ❯

Need Strong skills in C programming Experience with one or more of the following: C++, Python or Rust Confidence working in Linux environments Strong with embedded systems. Familiarity with open-source technologies and ecosystems A solid grasp of modern software development practices About the Team You'll be joining a multidisciplinary group of engineers united by a shared … passion for technology and innovation. The team works across the entire software development lifecycle - from concept and prototyping through to delivery and deployment. Experience with embedded systems and open-source development will help you stand out. We're Looking for Engineers Who Have a genuine enthusiasm for software engineering Enjoy collaborating with talented technical specialists Thrive on variety … every project brings fresh challenges and opportunities Desirable Experience Contributions to open-source projects CI/CD pipeline design and automation If you're excited by the idea of solving complex problems and creating next-generation software solutions, we'd love to hear from you. Apply today with your up-to-date CV. Contact: Laurence Powell @ KO2 Embedded More ❯

functional collaboration across sales, product, and marketing. Drive execution from concept to delivery, aligning product management with go-to-market initiatives. Identify and capitalize on new opportunities in the open source and cloud ecosystem . Represent the company at major cloud-related campaigns, opportunities, and events . Travel internationally (up to 2x per year for 1-2 weeks … record of building and growing global partner ecosystems . Exceptional leadership, presentation, and interpersonal skills, with the ability to energize stakeholders through data-driven storytelling . Passion for technology, open source, and cloud innovation. Strong work ethic, self-motivation, and accountability in a distributed work environment. Appreciation for diversity and effectiveness in multicultural, multinational organizations. Experience with Linux … competitive landscape. Nice to Have: Solid experience in the Public Cloud sector . Background in indirect/channel sales management . History of personal tech projects or contributions to open source. What We Offer Competitive compensation based on location, experience, and performance. Annual bonus or commission tied to results. Personal learning & development budget of USD 2,000 per year. More ❯

Provide best Customer experience in terms of responsiveness, resolution time, tone, and knowledge Support the customer throughout their entire lifecycle Provide expert-level technical support for customers using our Open Source Ledger and other backend modules. Troubleshoot complex issues, investigating and diagnosing problems quickly, and escalating them to the development team when necessary. Create and maintain detailed documentation … product teams to deliver seamless support and relay feedback for continuous improvement. Ability to prioritize and manage multiple tickets/issues Fluent in English Nice to have : Familiarity with open-source ecosystems, APIs, webhooks, or BE tools Basic understanding of financial services infrastructure (ledgers, reconciliation, transactions) Benefits We offer a competitive package including equity for employees. We organize … regular off-sites with the team in Europe and soon in the US! About FORMANCE : Formance is building the next-generation financial infrastructure - open-source, developer-first, and built to power the most ambitious fintech products of tomorrow. Formance is global native and serving enterprise companies around the globe, around the clock, to build and scale their financial More ❯

Provide best Customer experience in terms of responsiveness, resolution time, tone, and knowledge Support the customer throughout their entire lifecycle Provide expert-level technical support for customers using our Open Source Ledger and other backend modules. Troubleshoot complex issues, investigating and diagnosing problems quickly, and escalating them to the development team when necessary. Create and maintain detailed documentation … product teams to deliver seamless support and relay feedback for continuous improvement. Ability to prioritize and manage multiple tickets/issues Fluent in English Nice to have : Familiarity with open-source ecosystems, APIs, webhooks, or BE tools Basic understanding of financial services infrastructure (ledgers, reconciliation, transactions) Benefits We offer a competitive package including equity for employees. We organize … regular off-sites with the team in Europe and soon in the US! About FORMANCE : Formance is building the next-generation financial infrastructure - open-source, developer-first, and built to power the most ambitious fintech products of tomorrow. Formance is global native and serving enterprise companies around the globe, around the clock, to build and scale their financial More ❯

Provide best Customer experience in terms of responsiveness, resolution time, tone, and knowledge Support the customer throughout their entire lifecycle Provide expert-level technical support for customers using our Open Source Ledger and other backend modules. Troubleshoot complex issues, investigating and diagnosing problems quickly, and escalating them to the development team when necessary. Create and maintain detailed documentation … product teams to deliver seamless support and relay feedback for continuous improvement. Ability to prioritize and manage multiple tickets/issues Fluent in English Nice to have : Familiarity with open-source ecosystems, APIs, webhooks, or BE tools Basic understanding of financial services infrastructure (ledgers, reconciliation, transactions) Benefits We offer a competitive package including equity for employees. We organize … regular off-sites with the team in Europe and soon in the US! About FORMANCE: Formance is building the next-generation financial infrastructure - open-source, developer-first, and built to power the most ambitious fintech products of tomorrow. Formance is global native and serving enterprise companies around the globe, around the clock, to build and scale their financial More ❯

Provide best Customer experience in terms of responsiveness, resolution time, tone, and knowledge Support the customer throughout their entire lifecycle Provide expert-level technical support for customers using our Open Source Ledger and other backend modules. Troubleshoot complex issues, investigating and diagnosing problems quickly, and escalating them to the development team when necessary. Create and maintain detailed documentation … product teams to deliver seamless support and relay feedback for continuous improvement. Ability to prioritize and manage multiple tickets/issues Fluent in English Nice to have : Familiarity with open-source ecosystems, APIs, webhooks, or BE tools Basic understanding of financial services infrastructure (ledgers, reconciliation, transactions) Benefits We offer a competitive package including equity for employees. We organize … regular off-sites with the team in Europe and soon in the US! About FORMANCE: Formance is building the next-generation financial infrastructure - open-source, developer-first, and built to power the most ambitious fintech products of tomorrow. Formance is global native and serving enterprise companies around the globe, around the clock, to build and scale their financial More ❯