Contract Open Source Jobs in London

8 of 8 Contract Open Source Jobs in London

AI Engineer

London, United Kingdom
83zero Ltd
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 ❯
Employment Type: Contract
Rate: £625 - £650/day
Posted:

Senior Red Team Operator

London, South East, England, United Kingdom
SR2
frameworks such as TIBER-EU, DORA or STAR. Strong coding skills primarilly in C/C++, Rust or Python. Deep familiarity with C2 frameworks, OPSEC and extending commercial/open-source frameworks. Proven tool development or open-source contributions. Extensive knowledge of MITRE ATT&CK and red-team related security frameworks. Qualifications Red Team specific certs More ❯
Employment Type: Contractor
Rate: £650 per day
Posted:

Senior Java Developer - Glasgow - Investment Banking - Data/Spring/Linux/SQL/SDLC/Equity

London, United Kingdom
Scope AT Limited
to learn the business supported by the applications - Knowledge and desire to use agile software development practices Skills Desired: - JMS, MQ, Kafka - MongoDB - Knowledge of a range of common Open Source libraries used in Java development - Database performance tuning (relational and document) - Python/Shell Scripting - Financial domain knowledge (eg Equities) Glasgow based - hybrid - Inside IR35 By applying More ❯
Employment Type: Contract
Rate: GBP Annual
Posted:

Senior Go Developer

London, United Kingdom
Fruition Group
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 ❯
Employment Type: Contract
Posted:

GoLang Developer

London, United Kingdom
Fruition Group
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 passionate GoLang Developer seeking a challenging and rewarding contract role with a reputable tech company, apply now! Our client is looking to More ❯
Employment Type: Contract
Posted:

Spotify Backstage Developer

London, South East, England, United Kingdom
Hybrid / WFH Options
Robert Half
engineering teams to streamline developer workflows. Ensure scalability, security, and usability of the developer portal. Provide technical guidance, documentation, and training for engineering teams adopting Backstage. Contribute to Backstage open-source ecosystem (where applicable). Profile The Spotify Backstage Developer will have strong experience in TypeScript/JavaScript (React knowledge highly desirable). Experience working with Spotify Backstage More ❯
Employment Type: Contractor
Rate: Salary negotiable
Posted:

GenAI Prompt Engineer

South East London, London, United Kingdom
Certain Advantage
human feedback (RLHF). Familiarity with multi-modal AI systems (e.g., text-to-image, speech-to-text). Background in UX writing, technical writing, or computational linguistics. Contributions to open-source GenAI projects or publications in AI/ML conferences. Does this sound like your next career move? Apply today! Working with Certain Advantage We go the extra More ❯
Employment Type: Contract
Posted:

Application Developer

London, United Kingdom
Experis
Application Developer London - hybrid 8 Months+ Inside IR35- Umbrella only Core Technical Skills: React Native & Expo: Proficient with React Native and Expo open source modules (bare workflow) Strong React fundamentals: hooks, context, state management React Navigation, app routing JavaScript & TypeScript Advanced JavaScript (ES6+) and TypeScript Type safety and maintainability for large-scale projects Native Platform Integration Swift (iOS More ❯
Employment Type: Contract
Rate: £550.00 - £800.00 per day + Market Rate
Posted:
Open Source
London
10th Percentile
£375
25th Percentile
£450
Median
£600
75th Percentile
£650
90th Percentile
£743