21 of 21 WebSockets Jobs in Central London

development - Solid experience with Angular (preferably Angular 15+) - Hands-on experience with Next.js and React ecosystem - Familiarity with MongoDB, PostgreSQL, or other databases - Knowledge of RESTful APIs, GraphQL, and WebSockets - Experience with Git, CI/CD pipelines, and cloud platforms (GCP) Nice to Have: - Experience with Docker and container orchestration (e.g., Kubernetes) - Familiarity with testing frameworks (Jest, Mocha, Cypress) - Knowledge More ❯

What You’ll Do Design and build scalable backend and fullstack solutions in Node.js, TypeScript, React, AWS Collaborate closely on architecture, data models, and API design (REST, GraphQL, tRPC, WebSockets) Balance speed with long-term maintainability — quality and performance matter here Work on innovative challenges across document parsing, data visualisation, and ML integration Who You Are 5+ years’ experience in More ❯

Backend: Node.js • NestJS • MongoDB • Redis • BullMQ • Microservices • GCP AI/ML: Python • LangChain/LangGraph/LangSmith • Qdrant (vector DB) • Pydantic • FastAPI Integrations: WhatsApp Business API • Email • SMS • Webhooks • WebSockets ✅ What We're Looking For Must-Haves: Technical Chops 5+ years software engineering in production environments Strong in Node.js/TypeScript and Python Experience building microservices architectures Hands-on AI More ❯

RESTful APIs for mobile or web clients. Deep experience with distributed systems, microservices architecture, and event-driven patterns. Demonstrated experience with real-time applications and data streaming technologies (e.g., WebSockets, gRPC, Kafka). Experience integrating third-party AI/ML APIs (e.g., LLMs, STT/TTS, or other complex services) into production systems. Experience with containerization (Docker, Kubernetes) and deploying More ❯

/Java/Go + React) Worked with a variety of storage technologies (eg. Postgres, Mongo, Redis, Object) Experience with async and bi-directional communication protocols and patterns (eg. WebSockets, SSE) Designed and implemented event-driven distributed systems (eg. Kafka/Pulsar, RabbitMQ, MQTT, or similar) Experience with container orchestration and service containerisation (Kubernetes, Docker) Built and deployed services on More ❯

direction. Help define and implement end-to-end testing and deployment strategies. 🔧 Tech Stack: Frontend: React (Remix, SSR, and modern frameworks) Backend: Node.js, REST APIs, JSON:API standards Realtime: WebSockets, CRDTs (Yjs) Tooling: Tiptap, ProseMirror, CLI, IDE extensions Infra: CI/CD pipelines, Kubernetes, AWS ✅ What You Bring: ~6+ years building complex products in collaborative, cross-functional teams. Experience working More ❯

Experience building real-time or streaming systems, or systems with very high throughput demands. Experience influencing the architecture and design of applications Tech Stack - Python, ReactJS, Kubernetes, APi's, websockets, AWS Staff Software Engineer | GO/Python | £600-£800/day | Outside IR35 More ❯

modern JavaScript (ES6+) Proven experience delivering front-end applications in electronic trading environments Strong understanding of performance optimisation and low-latency UI design Experience with real-time data technologies (WebSockets, FIX, etc.) Familiarity with containerized front-end platforms such as OpenFin is a plus Prior exposure to Fixed Income products (Rates, Credit, Bonds) or other capital markets Experience in data More ❯

Pre-trade analytics (liquidity/pricing/scenario/what-if) and risk calculation services used in real time on the desk. Low-latency data services and streaming APIs (WebSockets/gRPC etc.) for live market and risk data. High-performance trader-facing UIs: time series views, blotters, RFQ/axe views, portfolio & risk dashboards. End-to-end systems: you More ❯

of performance tuning and concurrency. Hands-on experience with Kubernetes , AWS , and modern cloud infrastructure . Proficiency with databases — schema design, performance optimization, and analytics. Familiarity with REST APIs , websockets, and authentication/security best practices. A disciplined engineering mindset — you think about reliability, maintainability, and long-term scalability. Nice-to-haves Experience with MLOps and model-serving infrastructure. Background More ❯

or Android (3+ years) Experience leading or mentoring engineers in a technical leadership role Deep understanding of Flutter architecture, state management, testing and deployment workflows Comfortable with REST APIs, WebSockets, microservices, Firebase and AWS Experience building CI/CD pipelines and working with tools like Git, Docker and Jenkins A collaborative communicator who enjoys solving complex technical challenges What’s More ❯

data and AI interactions Database design : Creating efficient database schemas and query patterns using PostgreSQL with a focus on AI-related data structures Real-time features : Implementing Phoenix Channels, WebSockets and real-time communication API development : Building performant, well-documented APIs Frontend/CMS Development: Building our CMS : Developing and maintaining our React-based content management system Internal tooling : Creating More ❯

or similar). A proven track record of delivering polished, performant, and elegant user interfaces. Deep appreciation for UI/UX craftsmanship and accessibility. Familiarity with HTTP, REST APIs, websockets, and secure frontend patterns. A creative streak — you think visually and love turning complexity into clarity. Nice-to-haves Experience with 3D or WebGL rendering , or other data-rich visualisations. More ❯

experience, tooling, and mentoring. Degree in Computer Science or equivalent experience. Bonus points for: Open source contributions to front-end tooling, design systems, or data-visualisation libraries. Experience with WebSockets, PWAs, offline support, or design-token pipelines. How They Work Speed with craftsmanship: Continuous delivery, short feedback loops, and peer review excellence. Performance first: Time-to-Interactive, bundle size, and More ❯

architecture (This will be tested) Proven record of complex software delivery in the Interest Rates domain Excellent Java 21, Spring Boot, strong practical experience with containers, REST APIs, and WebSockets Strong experience of Agile, SCRUM, and test-driven development processes Strong leadership experience (at least 5 years of leading a team) Contact Ciara Clarke at Harrington Starr for a confidential More ❯

time, data-intensive user interfaces (e.g., chat applications, financial dashboards, real-time streaming apps). ? Strong experience integrating with backend APIs and services, particularly consuming real-time data via WebSockets, gRPC, or similar protocols. ? Proficiency in translating high-fidelity designs (e.g., Figma, Sketch) into beautiful, performant, and maintainable code. ? A strong understanding of Android UI performance optimization, memory management, and More ❯

define and evolve a robust mobile architecture using modern patterns Work closely with design & product to ship polished, scalable user interactions Essential Qualifications: Experience with real-time protocols (eg. WebSockets gRPC, MQTT, SSE or similar) Experience with implementing on-device machine learning (eg. PyTorch Mobile, ML Kit, TensorFlow Lite) Strong understanding of Android performance: lifecycle, coroutines, memory, and threading Familiarity More ❯

Your team Swissblock is a proprietary investment fund specializing in systematic trading algorithms and advanced global macro and crypto analytics. Our in-house technology powers a suite of innovative financial solutions, delivering deep market insights and actionable intelligence for professional More ❯

Commodity Risk & Analytics Engineer 📍 Location: London/Hybrid/Remote (UK-based) 💼 Reports to: Head of Engineering/Risk Analytics Lead 🧩 Team: Analytics & Risk Platform 🌊 About the Role Join a leading shipping analytics and optimisation company that’s transforming how More ❯

from the ground up. Key Responsibilities: Develop and enhance interactive dashboards for trading and analytics Collaborate directly with trading desks and stakeholders Build and maintain React-based UIs, leveraging WebSockets for real-time data Contribute to framework design and implementation (VP) Provide technical leadership and deeper FX/e-trading expertise Must-Have Skills: Strong React development experience (WebSockets a More ❯

📌 Role : Front-End Engineer within Quant/Research 📍 Location : London (Hybrid) 💰 Comp : Up to £175,000 + exceptional guaranteed bonus + full package 🏆 Company : Award-winning Quant Fund, founded by Computer Scientists Why this stands out: Tech Lead is not More ❯