1 to 25 of 102 Open Source Jobs in London

We're looking for open-source contributors and experienced engineers who understand how to review, maintain, and troubleshoot live repositories. Who You Are An open-source developer or maintainer who has contributed to or reviewed code in live repositories Comfortable reasoning about Git at a deep level Adept at debugging repository states and fixing broken histories … without data loss Preferred Qualifications 3+ years of software engineering experience in open-source, backend, or DevOps roles Demonstrated history of contributions on GitHub, GitLab, or other OSS platforms (Bonus) Experience in code review or AI/LLM model evaluation Why Join Turn your open-source experience into valuable, high-impact data Fully remote, flexible work More ❯

intersection of design and technology, with hands-on experience in image generation models, strong technical skills, and a sharp visual/design eye. Key Responsibilities Model evaluation & benchmarkingTest new open-source and proprietary models against Gendo's features, assessing aesthetic quality, fidelity, and usability from an architectural design perspective. Custom pipeline prototypingCreate and adapt ComfyUI custom nodes and … teams to hand off validated pipelines and guide feature development. Stay current with emerging technology Track, evaluate, and report on new model releases, training methods, and tools in the open-source ecosystem. Share insights with the team on opportunities and risks, and propose experiments to test new approaches. Requirements Hands-on generative AI experience: Direct work with image … generation models (Stable Diffusion, SDXL, ControlNet, VAE, embeddings). Practical experience training LoRAs, fine-tuned checkpoints, or other open-source models. Strong understanding of dataset management, labeling data, and training workflows. Technical skills: Python + PyTorch for model manipulation and training. ComfyUI & Other Open Source Projects: comfortable building and extending workflows with custom nodes. Ability to More ❯

love to hear from you. The Centre for Information Resilience (CIR) is an independent organisation dedicated to exposing human rights violations and threats to democracy. We achieve this through open source research, digital investigations, capacity-building with local partners, and collaboration with media to amplify our impact. CIR was born out of a determination to expose those spreading … and influence operations. We work closely with multilateral and national justice accountability bodies. We're always looking to connect with experienced investigators who specialise in collecting, analysing, and interpreting open-source data to generate actionable intelligence. Whether you're currently working in the private sector, law enforcement, journalism, or national security, we want to hear from you. Role … our talent community is the first place we look when hiring. The role The OSINT Investigator will work in a team dedicated to investigating information operations. They will use open-source tools, techniques and methodologies to monitor, collate, verify and analyse information shared across social media platforms and other media outlets, generating internal and external insight products and More ❯

Technical Architect - Data Products & Open Data 12-Month Contract Inside IR35 2 days a week on site in London Role Overview We are seeking an experienced Technical Architect to provide technical leadership for data products and open data services. This role requires a strong background in data product design, solution architecture, and open data platforms, with the … ability to lead multi-disciplinary teams and drive technical strategy across a large programme. Key Responsibilities Lead technical architecture and solution design for data products and open data services Provide design leadership across a multi-disciplinary team Apply expertise in data cataloguing, metadata management, and open/licensed data portals Leverage understanding of AI developments to shape and … enhance data services Work with open source tools and cloud infrastructure (AWS, Terraform) Guide technical direction and ensure consistent implementation across the programme Collaborate with a core team of 7-8 and a wider programme of 50 Essential Skills & Experience Proven experience with data products and open/licensed data portals Knowledge of data cataloguing systems and 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) Benefits Fully remote Competitive salary Performance bonus Competitive share options Annual company … 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 ❯

systems using Imandra. Working directly with customers to prototype and develop new product features. Contributing to novel advanced proof automation techniques, formal verification, and code synthesis algorithms. Contributing to open source projects, both upstreaming new features and fixes and publishing new open source libraries. You'll be working with a globally distributed team in different time … Experience building projects with OCaml, ReasonML, Haskell, or other functional programming languages. Working with cloud infrastructure, specifically GCP. An interest in theorem proving and formal verification. Experience contributing to open-source projects. Benefits Private Healthcare and Dental Plan Pension Plan Stock Option Plan 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 ❯

to support a leading AI lab in advancing research and infrastructure for next-generation machine learning systems. This engagement focuses on diagnosing and solving real issues derived from major open-source repositories through hands-on coding, debugging, and validation. It's an opportunity to contribute your technical expertise to cutting-edge AI research while working independently and remotely … on your own schedule. Key Responsibilities Analyze and resolve software issues drawn from large open-source codebases Write, test, and validate code solutions that address specific bugs or system inefficiencies Implement and refine APIs, database structures, and backend components supporting AI workflows Configure local development environments to replicate and investigate complex issues Ideal Qualifications 1+ years of professional … software engineering experience in a fast-paced or technically demanding environment Proven contribution history to one or more of the following open-source repositories is a must: astropy/astropy django/django matplotlib/matplotlib pytest-dev/pytest scikit-learn/scikit-learn sphinx-doc/sphinx sympy/sympy Advanced proficiency in Python, API development More ❯

scaling and optimising storage systems that support critical research and trading workloads. This role offers the opportunity to work on innovative, high-impact projects at the intersection of cloud, open-source, and high-performance computing. The Role: Design and develop scalable data orchestration services across cloud and on-prem environments. Create unified platform abstractions to streamline data access … across diverse storage technologies. Integrate open-source and vendor storage solutions through rapid prototyping and engineering. Optimise storage performance and efficiency across large-scale infrastructure. Collaborate across engineering functions to deliver robust end-to-end platform capabilities. Own operational responsibilities: troubleshooting, performance tuning, and user support. Your Background: 5+ years' development experience with a degree in Computer Science … complex backend systems at scale. Experience with Elasticsearch, Prometheus, Grafana and/or Datadog. Exposure either AWS or GCP plus IaC, (Terraform or similar) would be beneficial. Knowledge with open-source storage tools (Ceph, Minio, JuiceFS or Fuse) and familiarity with high-performance data transport protocols (RDMA, GPUDirect, DPDK) would be well received. This is a chance to More ❯

scaling and optimising storage systems that support critical research and trading workloads. This role offers the opportunity to work on innovative, high-impact projects at the intersection of cloud, open-source, and high-performance computing. The Role: Design and develop scalable data orchestration services across cloud and on-prem environments. Create unified platform abstractions to streamline data access … across diverse storage technologies. Integrate open-source and vendor storage solutions through rapid prototyping and engineering. Optimise storage performance and efficiency across large-scale infrastructure. Collaborate across engineering functions to deliver robust end-to-end platform capabilities. Own operational responsibilities: troubleshooting, performance tuning, and user support. Your Background: 5+ years' development experience with a degree in Computer Science … complex backend systems at scale. Experience with Elasticsearch, Prometheus, Grafana and/or Datadog. Exposure either AWS or GCP plus IaC, (Terraform or similar) would be beneficial. Knowledge with open-source storage tools (Ceph, Minio, JuiceFS or Fuse) and familiarity with high-performance data transport protocols (RDMA, GPUDirect, DPDK) would be well received. This is a chance to More ❯

role grows, this may extend to leading these teams, owning solutions end-to-end and advising clients in this space. The typical applications we build use existing closed or open-source foundational models, potentially with some fine tuning. We generally do not need to train our own foundational models from scratch. Requirements Responsibilities The examples describe the types … hands-on experience of developing production-grade solutions involving: • Building Microservices (including scalable data pipelines using frameworks like Spark) • Data technologies (Python, SQL) • Large language models, fine tuning (closed & open source, OpenAI API) • Solution design (mainly data applications using Python, SQL and other allied tech stack) • Analytical problem solving We are not restricted to the technologies we use More ❯

use cases Prototype multi-agent systems, reasoning engines, and knowledge-graph integrations Implement and fine-tune models for language understanding, decision automation, and data insight generation Evaluate and integrate open-source and commercial AI frameworks into orchestration workflows Ensure AI solutions are explainable, auditable, and compliant with public- sector governance standards Advise on AI strategy, ethical use, and … Understanding of ethical AI, governance frameworks, and public-sector AI standards Familiarity with BPMN/DMN, process orchestration, or workflow automation platforms Experience contributing to AI research, publications, or open-source projects Holds UK security clearance (SC, DV, eDV) What They Offer A company option scheme gives their employees a stake in the organisation theyre building meaningful missions. More ❯

use cases Prototype multi-agent systems, reasoning engines, and knowledge-graph integrations Implement and fine-tune models for language understanding, decision automation, and data insight generation Evaluate and integrate open-source and commercial AI frameworks into orchestration workflows Ensure AI solutions are explainable, auditable, and compliant with public- sector governance standards Advise on AI strategy, ethical use, and … Understanding of ethical AI, governance frameworks, and public-sector AI standards Familiarity with BPMN/DMN, process orchestration, or workflow automation platforms Experience contributing to AI research, publications, or open-source projects Holds UK security clearance (SC, DV, eDV) What They Offer A company option scheme gives their employees a stake in the organisation theyre building meaningful missions. More ❯

use cases Prototype multi-agent systems, reasoning engines, and knowledge-graph integrations Implement and fine-tune models for language understanding, decision automation, and data insight generation Evaluate and integrate open-source and commercial AI frameworks into orchestration workflows Ensure AI solutions are explainable, auditable, and compliant with public- sector governance standards Advise on AI strategy, ethical use, and … Understanding of ethical AI, governance frameworks, and public-sector AI standards Familiarity with BPMN/DMN, process orchestration, or workflow automation platforms Experience contributing to AI research, publications, or open-source projects Holds UK security clearance (SC, DV, eDV) What They Offer A company option scheme gives their employees a stake in the organisation theyre building meaningful missions. More ❯

use cases Prototype multi-agent systems, reasoning engines, and knowledge-graph integrations Implement and fine-tune models for language understanding, decision automation, and data insight generation Evaluate and integrate open-source and commercial AI frameworks into orchestration workflows Ensure AI solutions are explainable, auditable, and compliant with public- sector governance standards Advise on AI strategy, ethical use, and … Understanding of ethical AI, governance frameworks, and public-sector AI standards Familiarity with BPMN/DMN, process orchestration, or workflow automation platforms Experience contributing to AI research, publications, or open-source projects Holds UK security clearance (SC, DV, eDV) What They Offer A company option scheme gives their employees a stake in the organisation they’re building meaningful More ❯

fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security and freedom online. Our journey began with Proton Mail, the largest secure email service globally, and has since … structure flat to keep moving fast and avoid unnecessary politics. Tired of blending into the crowd? Join us and do work you can truly be proud of. Check our open-source projects here ! Role overview As a fullstack cross-platform Senior Android Engineer, you'll play a pivotal role in developing Proton Pass using Jetpack Compose and Rust. … meetings Work that Matters: Proton is a community-first organisation, started with the support of a crowdfunding campaign and built with community input - to this day, Proton's only source of revenue is user subscriptions: over 100 million people trust and support Proton, and we put our users and community first in everything we do (read more about our More ❯

AI to simplify tasks, save time, and enhance learning and creativity. Our technology is designed to integrate seamlessly into daily working life. We democratize AI through high-performance, optimized, open-source and cutting-edge models, products and solutions. Our comprehensive AI platform is designed to meet enterprise needs, whether on-premises or in cloud environments. Our offerings include … and domains. Working cross-functionally with both external and internal science, engineering, and product teams you will deliver high-impact AI solutions that turn the needle. This position is open for our local offices in Paris and London. What you will do • Run pre-training, post-training and deploy state of the art models on clusters with thousands of … bring a variety of research experiences, such as working with agents, multi-modality, robotics, diffusion models, or time-series analysis. • Have contributed to a large codebase used by many (open source or in the industry). • Have a track record of publications in top academic journals or conferences. • Love improving existing code by fixing typing issues, adding tests More ❯

a distinctive angle from the ground up, focusing on the flow of funds first to help businesses realize their product visions on a solid financial foundation. Starting with an Open Source Ledger (i.e. a database for financial transactions), we’re building a comprehensive suite of modern financial backend modules, including native and automated reconciliation, workflow engines, and connectors … the trusted financial backend for leading SaaS companies and financial institutions like Booksy, Doctolib, and Liberis, along with many others worldwide. Our success stems from the trust in our open-source foundation, the high level of programmability of our solutions, and our software-first approach, moving beyond traditional payment business models. We’ve recently opened two new offices More ❯

Figma and is spearheaded from the London office. You'll be working on one of the most exciting areas within Figma incorporating design thinking, the latest AI developments, and open source developer tooling. This is a full time role that can be held from our London hub or remotely in the UK. What you'll do at Figma … senior engineers. While not required, it's an added plus if you also have: Experience building large scale systems using React, C++, and/or Ruby Experience building & maintaining open source software and/or libraries for developers At Figma, one of our values is Grow as you go. We believe in hiring smart, curious people who are More ❯

new position where the successful candidate will be instrumental in scaling and leading a team as we grow the OSINT capability. A strong interest and experience in Cyber Security, Open-Source and/or the Dark Web is necessary for this role. Serve as the main point of contact for current clients. Interaction with the US team, Dark … organised crime - cyber attacks; ransomware; drug trafficking. Communicate regularly with clients and formally track adoption trends, sentiment, and opportunities for deeper engagement. Present OSINT capabilities at events. Familiarity with open-source intelligence/research (OSINT) Acting as a point of triage and giving warm leads back to clients to help source. Create vignettes for use case development and More ❯

PyTorch custom ops or backends. Working knowledge of performance profiling tools and GPU/CPU interplay. Strong written communication and ability to deliver well-documented, self-contained modules. Prior open-source contributions to PyTorch, TorchInductor, Triton, or related projects are a plus. 4) More About the Opportunity Ideal for contractors who enjoy building clean, high-performance abstractions in … invoice cadence. Confidentiality and IP assignment agreements may apply. 6) Application Process Share a concise summary of your experience with PyTorch internals and systems-level programming. Include links to open-source work, GitHub PRs, or sample operator implementations. Provide hourly rate, availability, and relevant technical background. Selected experts may complete a short, paid pilot module to demonstrate fit. More ❯

fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online. Our journey began with Proton Mail, the largest secure email service globally, and has since … structure flat to keep moving fast and avoid unnecessary politics. Tired of blending into the crowd? Join us and do work you can truly be proud of. Check our open-source projects here Purpose of the role As we are rapidly growing, we are now in search of a sharp and mission-driven Senior Product Designer (UX/… programs. Work that Matters: Proton is a community-first organization, started with the support of a crowdfunding campaign and built with community input. To this day, Proton's only source of revenue is user subscriptions. Over 100 million people trust and support Proton, and we put our users and community first in everything we do. Read more about our More ❯

licensing agreements, SaaS contracts, NDAs, and strategic partnerships with customers, vendors, and partners. Developing IP Strategies: Taking ownership of the company's IP strategy, including trademarks, patents, licensing, and open-source compliance. Data Privacy Compliance: Advising on data privacy and data protection regulations across multiple jurisdictions, including the US (CCPA, CPRA, HIPAA), EU (GDPR), and other international laws. … and data protection laws, including CCPA, CPRA, HIPAA, GDPR, and other international regulations. Expertise in managing commercial tech transactions, including B2B licensing, SaaS agreements, and strategic partnerships. Familiarity with open-source licensing models and compliance. A proven ability to advise on product development while ensuring data protection compliance. Exceptional drafting, communication, and collaboration skills. A proactive mindset for More ❯

improving the debugging experience. This involves work LLVM, the Clang and Swift compiler frontends, the LLDB debugger, and related tools. You will closely collaborate with the Swift and LLVM open source projects. Description Our team works at the intersection of compiler and debugger technology: we are responsible for the debugging experience — from generating debug information in our compilers … Experience with serialization formats such as Clang and Swift modules Experience with LLVM, Clang, and LLDB development Experience working with debug info formats like DWARF Experience with contributing to Open Source projects More ❯

Experience integrating process automation with case-management or service-orchestration platforms Understanding of agentic AI capabilities and how they can complement workflow automation Experience mentoring developers or contributing to open-source Camunda extensions Already holding UK security clearance (SC, DV, eDV) What They Offer A company option scheme gives their employees a stake in the organisation theyre building More ❯