1 to 25 of 59 Open Source Jobs in London

Fullstack Engineer (Backend)

Hiring Organisation
Randstad Technologies Recruitment
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£450 - £550/day
Opportunity You will join a high-impact development squad building commercial offerings on top of the thriving open-source Backstage framework. You will design and build backend systems, APIs, and developer portals that elevate the developer experience across external commercial clients and internal engineering teams alike. Your Impact … streamline engineering workflows. Engineering Excellence: Elevate code quality through technical RFCs, code reviews, architectural feedback, unit testing, and full operational ownership of your services. Open Source Collaboration: Partner with product managers, designers, and the open-source community to shape the evolution of internal developer platforms. Your ...

Senior Software Engineer

Hiring Organisation
Oscar Technology
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
£70,000 - £90,000 per annum
Already live with banks and financial institutions, and hiring to build the product further. You'll work across our data integration platform and our open-source schema language and ecosystem. What You'll Work On Mostly Kotlin backend, but everyone touches the full stack: the integration platform (streaming … pipelines, query execution, API composition, schema resolution, running in production at real financial institutions); our open-source schema language (compiler, type system, query engine, no prior compiler experience needed); our AI agent built on Spring AI (greenfield work orchestrating integrations autonomously); and the frontend (mainly Angular, some React ...

Security Architect

Hiring Organisation
TXP
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£600 - £650 per day
candidate will have come from a strong technical background, and have an understanding of attack vectors for high threat environments, across both proprietary and open-source technology stacks. You will advise and enable technical teams to make security decisions and provide advice and guidance, ensuring the effective … programmes, projects or a product-centric organisation. You will have a good understanding of a broad range of industry-standard technologies, both proprietary and open source, across a diverse range of Microsoft and Linux-based deployments, across physical, virtual and containerised compute. You will have experience in securing ...

Test Lead

Hiring Organisation
Hackajob Ltd
Location
South West London, London, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£75,000
acumen to drive quality across our engineering processes. You will be responsible for designing, building, and maintaining robust automation and performance testing frameworks using open-source tools, while also mentoring and guiding other engineers. Key Responsibilities: - Strategic Leadership: Plan and lead large-scale, complex testing activities, managing risks … identifying opportunities to improve quality and efficiency. - Technical Ownership: Build, maintain, and evolve automation frameworks using open-source technologies. - Process Improvement: Lead investigative work into existing processes to identify gaps and implement improvements. - Test Design & Execution: Design and execute a wide range of testing techniques including functional, performance ...

Director Strategic Alliances

Hiring Organisation
Searce Inc
Location
City of London, London, United Kingdom
/Azure to position Searce as client-centric, not vendor-locked. Data-Driven Deal-Maker – Uses telemetry to steer pipeline health and ROI. Open-Source Contributor – Shares code, wins mindshare, accelerates co-innovation. Experience & Relevance 12+ years in cloud/AI alliances or partner GTM; 6+ years leading … cloud integration patents. GCP/AWS Partner Award alumnus or Dev Champion speaker. Maintainer of a widely used GCP/AWS/AI open-source repo. Battle-tested: rescued at-risk alliances and turned them into $-wins. Founder energy: built a startup or new region from scratch; thrives ...

Solution Architect

Hiring Organisation
Accenture
Location
London Area, United Kingdom
development of innovative offerings Participate in thought leadership about Architecture and Digital Transformation. Experience Required: The successful candidate will have: Strong working knowledge of open source, open standards and cloud technologies Good understanding of architectural concepts, methodologies and approaches Excellent working knowledge of design patterns and modelling ...

Security Operations Room Operator

Hiring Organisation
Sapient Insight
Location
City of London, London, United Kingdom
Company Description Sapient Insight advises clients on strategic opportunities and risks by turning complex information into clear, actionable insight. Using digitised human networks and open-source analytical software, the company sources verified, novel, and relevant data that gives clients a competitive advantage and supports better, faster decisions. Sapient … analytical and observation skills for monitoring multiple information sources, identifying anomalies, and assessing security-related risks. Proficiency with security monitoring systems, dashboards, and basic open-source information tools or intelligence platforms. Effective written and verbal communication skills for logging events, producing incident reports, and coordinating with internal ...

Senior & Principal Java Camunda Enigneers

Hiring Organisation
Casci
Location
South East London, London, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£75,000
event-driven design and message brokers ( e.g. Kafka, RabbitMQ) Understanding of agentic AI capabilities and how they can complement workflow automation Experience contributing to open-source Camunda extensions Holds UK security clearance What We Offer Meaningful missions. Tackle high-impact public-sector problems that improve services millions rely ...

Software Development Engineer in Test - DV Cleared

Hiring Organisation
NSD
Location
London, United Kingdom
Employment Type
Permanent, Work From Home
Cloud Platform. Knowledge of performance, security, or accessibility testing. Experience with infrastructure-as-code or container technologies including Docker, Kubernetes, or Terraform. Contributions to open-source projects or technical communities. What's on Offer Opportunity to work on technically challenging programmes with real-world impact. Collaborative engineering environment ...

Lead AI Engineer

Hiring Organisation
Hackajob Ltd
Location
South West London, London, United Kingdom
Employment Type
Permanent
Gemini), machine learning libraries (e.g. scikit-learn, XGBoost). Experience with data storage for AI, vector databases, semantic search, and knowledge graphs. Contributions to open-source AI projects or research publications. Familiarity with AI security, privacy, and compliance standards e.g. ISO42001. Embracing our differences At Kainos, we believe ...

Principal Java Engineer

Hiring Organisation
Profile 29
Location
South East London, London, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£90,000
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) Other Stuff NB: Please only apply if you have resided ...

Site Reliability Engineer (SRE) / Platform Engineer

Hiring Organisation
Adecco
Location
City of London, London, United Kingdom
Employment Type
Contract
Docker and multi-container application architecture experience. Experience working within scientific, pharmaceutical, genomics, or bioinformatics environments. Start-up or high-growth technology company experience. Open-source software contributions. Technical leadership, mentoring, or coaching experience. Contract Details: 6-Month Initial Contract Inside IR35 London-based Hybrid Working (2 days ...

Senior Cloud Engineer - SC Cleared

Hiring Organisation
VIQU IT Recruitment
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£400 - 500 per day
data platform, and needs someone to own the ground it runs on. Kubernetes, infrastructure as code, CI/CD and observability, on a deliberately open-source stack with no managed-service shortcuts. You run it yourself rather than consuming managed equivalents. The interesting part is the topology ...

Security Engineer

Hiring Organisation
Precise Placements
Location
London, South East, England, United Kingdom
Employment Type
Temporary
Salary
£70,000 - £85,000 per annum
detection accuracy Assess SIEM architecture and recommend improvements across ingestion, parsing, correlation, and storage Implement automation and orchestration (SOAR) to streamline security operations Log Source Onboarding & Integration Identify and onboard log sources across cloud, network, endpoint, identity, and application layers Develop custom parsers, connectors, and ingestion workflows Collaborate with … Data Loss Prevention (DLP) Network security and secure remote access solutions Cloud and software-defined environments (SaaS, IaaS, PaaS, DaaS) Cyber threat intelligence and open-source intelligence tools Disaster recovery and business continuity planning Knowledge of data privacy regulations Additional Information Some out-of-hours work ...

Software Engineer

Hiring Organisation
Experis
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£750 - £830 per day
Kubernetes (e.g. GKE). Familiarity with GCP networking and security controls - VPC, VPC Service Controls (VPC-SC), and private connectivity. Contributions to relevant open-source projects. Knowledge or interest in disease biology, molecular biology and medicine. Experience working with biomedical data (e.g., genomics, transcriptomics, proteomics, electronic health records ...

Senior Automation Test Engineer

Hiring Organisation
Hackajob Ltd
Location
South West London, London, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£70,000
manual testing. Confident with building and maintaining frameworks in one or more of these languages: Java, JavaScript, Python, or C#. Have practical experience with open source tools such as: Cypress, Karate, PlayWright, Selenium or similar. Worked in an agile environment. Develop and maintain high-quality automated test scripts ...

Principal Automation Test Consultant

Hiring Organisation
Scale Factory
Location
South East London, London, United Kingdom
Employment Type
Permanent, Work From Home
success and leading by example. You will: Design and Develop: Build and support automation or performance test frameworks using the most appropriate solutions. Whether open source or commercial, or a combination. Collaborate with Clients: Work closely with clients to understand their requirements and create tailored QA strategies. ...

Senior Forward Deployment Engineer

Hiring Organisation
Luxoft
Location
London Area, United Kingdom
smoke tests using Test-Driven Development practices. Select appropriate automation-testing approaches per application and drive implementation, including the use of AI coding assistance. Source suitable test data and implement secure data masking for lower environments. Conduct vulnerability triage, root-cause and dependency reachability analyses, remediation prioritization, secure code … changes, and regression testing. Upgrade Java, JVM, NPM, Spring, open-source libraries, internal dependencies, installed software, base images, and operating systems to supported versions. Establish sustainable dependency-management processes with continuous library updates using Renovate or equivalent tools. Modernize legacy applications and middleware stacks, including those deployed ...

AI Solution Architect - Senior Manager/Associate Director Capital Markets

Hiring Organisation
Datatech Analytics
Location
London, United Kingdom
Employment Type
Permanent
containerised and GPU enabled environments Supporting AI implementation programmes from proof of concept through to enterprise deployment and optimisation Evaluating and selecting technologies across open source and commercial platforms Designing and integrating AI solutions into existing enterprise systems and applications Working with AI Engineers, Data Scientists and technical ...

Principal Java Software Engineer

Hiring Organisation
Profile 29
Location
South East London, London, United Kingdom
Employment Type
Permanent
Salary
£90,000
level React Native or equivalent building native mobile from a React codebase Design system or component library ownership Consultancy or client-facing delivery background Open-source contributions, conference talks, or published technical writing Polyglot beyond Java Other Stuff NB: for non-UK Citizens; we cannot accept applications from ...

Principal Software Engineer

Hiring Organisation
Profile 29
Location
South East London, London, United Kingdom
Employment Type
Permanent
Salary
£90,000
level React Native or equivalent building native mobile from a React codebase Design system or component library ownership Consultancy or client-facing delivery background Open-source contributions, conference talks, or published technical writing Polyglot beyond Java Other Stuff NB: for non-UK Citizens; we cannot accept applications from ...

Senior Test Engineer

Hiring Organisation
Hackajob Ltd
Location
South West London, London, United Kingdom
Employment Type
Permanent, Work From Home
manual testing. Confident with building and maintaining frameworks in one or more of these languages: Java, JavaScript, Python, or C#. Have practical experience with open source tools such as: Cypress, Karate, PlayWright, Selenium or similar. Worked in an agile environment. Candidates must have active SC Clearance Additional Information ...

Sr. Director, Onyx Application Engineering

Hiring Organisation
GSK
Location
Greater London, United Kingdom
Employment Type
Full Time
Experience in establishing engineering standards , software quality frameworks, governance processes, and best practices across large organizations. Industry visibility through technical publications, conference speaking engagements, open-source contributions, or participation in engineering communities. Experience attracting, developing, and retaining high-performing engineering talent within competitive technology markets. Experience leading global ...

Frontend Engineer - Java and Open Source - Private and FS

Hiring Organisation
Hackajob Ltd
Location
South West London, London, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£70,000
hackajob is partnering directly with Version 1 to hire for this role. Company Description Version 1 has celebrated over 26 years in Technology Services and continues to be trusted by global brands to deliver solutions ...

Linux Systems Engineer

Hiring Organisation
Becrypt
Location
London, United Kingdom
Employment Type
Permanent
Purpose: We are seeking an innovative and dynamic Linux Systems Engineer to help shape the next generation of secure endpoint solutions. This role is open to enthusiastic engineers ready to tackle complex challenges in a fast moving environment. You will work at the intersection of Linux internals, networking … level or performance-critical development. Experience with containerisation (Docker, Kubernetes). Familiarity with endpoint security, intrusion detection, or system hardening. Contributions to Linux or open-source projects. Experience with debugging, profiling, or performance optimisation tools. Why Join Us: Shape the future of secure endpoint technology. Work on high ...