1 to 25 of 75 WebSockets Jobs in London

Senior Full-Stack Developer

Location
City Of London, England, United Kingdom
Good understanding of cloud deployment Strong understanding and proven experience working with browsers and web APIs including HTML Canvas, Drag and Drop, SSE, WebSockets, etc. Effective communication skills through written reports and presentations. Ability to version control code using tools such as Git, GitHub and Azure DevOps in a collaborative ...

Software Developer | Capital Markets

Location
Greater London, England, United Kingdom
Technologies/Infra : Docker, Kubernetes, Kafka, Azure, GCP, NoSQL, DNS Design : Serverless, cloud-native/PaaS, event driven, pub/sub, real-time/websockets, architectural design records (ADRs) SDLC : Agentic AI/Context Engineering; CoPilot, Claude, Codex, building custom agents across full SDLC Experience working in a regulated environment ...

Senior Python Developer/ Engineer

Location
City of Westminster, England, United Kingdom
Have Skills: Experience with React/NextJS. Experience with automated testing frameworks such as Pytest, Unit Testing, Integration Testing, and API Testing. Exposure to WebSockets, event‐driven architectures, or real‐time data patterns. Familiarity with modern authentication approaches such as OAuth2, OpenID Connect, JWT, and AWS Cognito. Experience with OpenAPI ...

Senior Backend Engineer - Investment Technology

Location
Greater London, England, United Kingdom
authorization standards (OAuth2, OIDC, JWT) and secure service design. Messaging and Real‐Time Data — Experience with Kafka, MQ or similar messaging platforms, or with WebSockets and streaming architectures. API Management — Experience with API gateways, documentation tooling (e.g. OpenAPI/Swagger) and developer onboarding for shared services. Previous asset management/ ...

Senior Backend Engineer - Investment Technology

Location
City Of London, England, United Kingdom
authorization standards (OAuth2, OIDC, JWT) and secure service design.Messaging and Real-Time Data — Experience with Kafka, MQ or similar messaging platforms, or with WebSockets and streaming architectures.API Management — Experience with API gateways, documentation tooling (e.g. OpenAPI/Swagger) and developer onboarding for shared services.Previous asset management/financial services experience ...

Full-Stack Engineer ×5

Location
Greater London, England, United Kingdom
help grow a shared component library. The interface respects a detailed role- and permission-based access model, and real-time views over WebSockets handle loading, empty, error and stale-data states with care. The services and data You design and build REST services in async Python with FastAPI or Django ...

AI Engineer, London

Location
Greater London, England, United Kingdom
environments. You have a sharp eye for UI/UX design and have built intuitive, AI-driven interfaces. You have experience with GraphQL, WebSockets, or real-time data streaming. You’ve contributed to open-source projects or have built developer tools for AI. #J-18808-Ljbffr ...

Embedded Software Engineer - Connected Energy Devices

Location
Greater London, England, United Kingdom
systems. Responsibilities Develop and maintain connectivity across Ethernet, Wi-Fi, Thread, Zigbee and BLE; build secure, reliable device messaging using MQTT, CoAP, HTTP or WebSockets; support device time synchronisation using NTP or PTP. Develop low-level firmware and drivers for microcontrollers and embedded peripherals. Integrate devices with cloud IoT platforms ...

Embedded Software Engineer

Location
Greater London, England, United Kingdom
networking: develop and maintain connectivity across Ethernet, Wi-Fi, Thread, Zigbee and BLE; build secure, reliable device messaging using MQTT, CoAP, HTTP or WebSockets; support device time synchronisation using NTP or PTP Device security and OTA management: contribute to secure boot flows, key and certificate provisioning and hardware-backed device ...

Senior Financial Software Consultant

Location
Greater London, England, United Kingdom
below is required. Java 17+ and Kafka (or a comparable streaming platform) are essential. Languages: Java 17+, Python Frameworks and protocols: Spring, Kafka, REST, WebSockets Databases: Oracle, PostgreSQL, CockroachDB, Cassandra, MongoDB Infrastructure: Kubernetes, AWS, Azure Agentic AI: Claude Code, Copilot Agentic Mode, OpenAI Codex Observability: Splunk, Dynatrace, Grafana About ...

Web Developer

Location
Greater London, England, United Kingdom
real-time messaging on the Web, including low level protocol and API design Exposure to the following would be advantageous: RxJS, Webpack, Storybook & Websockets Knowledge of Java would be beneficial but is not a necessity Passion for UX and Interaction design Strong communication skills Relevant academic qualifications, including a college ...

Senior Software Engineer (C# / .Net) · London ·

Location
Greater London, England, United Kingdom
Storage , and data-modelling trade-offs API design : RESTful contracts, versioning, webhooks, long-running operations (202 Accepted patterns) Real-time & frontend integration : SignalR/WebSockets, SPA frameworks (Vue/Nuxt or similar), TypeScript What good looks like You leave systems clearer, more correct, and easier to evolve Problems are solved ...

Mid-Level Software Engineer (Backend and Integrations) - Fixed-term Contract

Location
Greater London, England, United Kingdom
integrating RESTful and/or gRPC APIs, with a good understanding of authentication, security and caching. Real-time and event-driven systems. Experience with WebSockets, SSE or event streaming platforms such as Kafka or Azure Event Hubs. AI fundamentals and coding agents. A good grasp of AI and LLM fundamentals ...

Director Data & Analytics API Experience - Data Services

Location
Greater London, England, United Kingdom
Python, with the ability to write clean, idiomatic, and robust code for public consumption. Technical Stack Environment: Google Cloud Platform (GCP), Apigee. Protocols: WebSockets, REST, GCS. Tooling: Python (Expert), OAuth 2.0, GitHub, Protobuf/Avro, SQL. Company Benefits Bonus Programme Equity Programme Employee Stock Purchase Plan (ESPP) Private Medical ...

Back-End Engineer Trading: Blockchain.com in London

Location
Greater London, England, United Kingdom
backend service development, REST API design, SQL, and internal or third-party service integration. Performance fundamentals, problem-solving, and communication skills are also required. WebSockets, event-driven systems, Docker or Kubernetes, AWS, and an interest in financial markets or crypto are listed as pluses. London Work Arrangement The role ...

Back-End Engineer, Trading

Location
Greater London, England, United Kingdom
Professional experience building backend services, ideally in Kotlin and/or Python. Solid experience designing and building backend services and REST APIs; experience with WebSockets or other real-time streaming protocols such as NATS/JETSREAM is a plus. Working knowledge of SQL and experience integrating with multiple internal ...

Lead Financial Software Consultant

Location
Greater London, England, United Kingdom
below is required. Java 17+ and Kafka (or a comparable streaming platform) are essential. Languages Java 17+, Python Frameworks and protocols Spring, Kafka, REST, WebSockets Databases Oracle, PostgreSQL, CockroachDB, Cassandra, MongoDB Infrastructure Kubernetes, AWS, Azure Agentic AI Claude Code, Copilot Agentic Mode, OpenAI Codex Observability Splunk, Dynatrace, Grafana About ...

Senior Full-Stack Engineer

Location
Greater London, England, United Kingdom
Redis Understanding of cloud services (AWS, Vercel, or similar) Excellent problem‐solving and communication skills Nice to Have Experience with real‐time systems and WebSockets Knowledge of payment processing (Stripe) Previous experience in ticketing or events industry Contributions to open‐source projects Benefits Competitive salary with equity options. Flexible hybrid ...

Backend Developer

Location
Greater London, England, United Kingdom
rate data streams Exceptional problem-solving abilities with a bias toward practical solutions Eligible to work in the UK Nice to Have Understanding of WebSockets and real-time data streaming between backend services and clients Experience with pybind11 or similar binding frameworks Knowledge of scientific data formats, particularly HDF5 Experience ...

Senior Frontend Developer (React & React Native)

Location
Greater London, England, United Kingdom
have: Experience with micro frontends, monorepos, or component libraries (Storybook, Bit); Knowledge of design systems (Material UI, Tailwind, or similar); Exposure to WebAssembly, WebSockets, or real-time applications; Experience integrating third‐party tools and libraries (e.g. Trustly, Whizdom); Ability to understand business requirements and translate them into technical requirements. Your ...

Senior Software Engineer, Backend

Hiring Organisation
Unity Technologies
Location
London, England, United Kingdom
data persistence, data consistency, and state managementHands-on experience with cloud platforms and containerized, orchestrated deploymentsExperience with real-time or multiplayer systems, such as WebSockets, collaborative editing, or state synchronizationSound judgment that teammates trust, and effective written/verbal communication with technical and non-technical colleaguesComfort with ambiguity and with ...

Real-Time Backend Engineer | Crypto Trading Platform (London)

Location
Greater London, England, United Kingdom
time client APIs, collaborating closely with product, frontend, and trading teams. Applicants should have Kotlin or Python backend experience, proficiency with REST APIs and WebSockets, and knowledge of SQL, Docker/Kubernetes, and AWS. #J-18808-Ljbffr ...

Senior Full Stack Engineer

Location
Greater London, England, United Kingdom
worked with Python Stronger still if you have worked with: Chrome extensions or the Chrome DevTools Protocol Real-time interfaces using streaming, SSE or WebSockets Design systems or component libraries FastAPI or a similar Python API framework Preact and Vite You do not need a background in Python backend development. ...

Senior Frontend Developer

Location
Greater London, England, United Kingdom
Experience making a slow app fast, and the numbers to show for it Comfort working with REST APIs and live data over WebSockets or server-sent events Clear written communication. We're remote, so a lot of decisions get made in pull requests and short design docs Nice to have ...

UI Engineer

Location
Greater London, England, United Kingdom
with native modules). Deep understanding of modern UI architecture, state management paradigms, and responsive design systems. Experience consuming, designing, and optimizing APIs (REST, WebSockets, or GraphQL) for client performance and intermittent connectivity. Familiarity with client-side security fundamentals (content security policies, token management, secure device storage, threat modeling ...