1 to 25 of 50 WebSockets Jobs in the City of London

support the platform’s bilingual capabilities. Experience with AI/ML integrations or recommendation systems. Expertise in Matrix/Synapse integration for real-time messaging and communication. Knowledge of WebSockets, real-time messaging, and event-driven architectures. Background in platform monetisation and payment integration. Strong familiarity with access control, authentication (OAuth, JWT), and data privacy regulations. More ❯

support the platform’s bilingual capabilities. Experience with AI/ML integrations or recommendation systems. Expertise in Matrix/Synapse integration for real-time messaging and communication. Knowledge of WebSockets, real-time messaging, and event-driven architectures. Background in platform monetisation and payment integration. Strong familiarity with access control, authentication (OAuth, JWT), and data privacy regulations. More ❯

ceremonies including stand-ups, backlog refinement, and retrospectives Evaluate and improve the frontend architecture, including state management and API integrations Help implement real-time frontend/backend communication using WebSockets Extend and optimise the use of Nx for a frontend monorepo setup Leverage Zustand and TanStack Query for state/data handling, and React Router for navigation Work on real More ❯

ceremonies including stand-ups, backlog refinement, and retrospectives Evaluate and improve the frontend architecture, including state management and API integrations Help implement real-time frontend/backend communication using WebSockets Extend and optimise the use of Nx for a frontend monorepo setup Leverage Zustand and TanStack Query for state/data handling, and React Router for navigation Work on real More ❯

ceremonies including stand-ups, backlog refinement, and retrospectives Evaluate and improve the frontend architecture, including state management and API integrations Help implement real-time frontend/backend communication using WebSockets Extend and optimise the use of Nx for a frontend monorepo setup Leverage Zustand and TanStack Query for state/data handling, and React Router for navigation Work on real More ❯

ceremonies including stand-ups, backlog refinement, and retrospectives Evaluate and improve the frontend architecture, including state management and API integrations Help implement real-time frontend/backend communication using WebSockets Extend and optimise the use of Nx for a frontend monorepo setup Leverage Zustand and TanStack Query for state/data handling, and React Router for navigation Work on real More ❯

and designing clean data models (SQL/NoSQL) Bonus Points For: Familiarity with AI/LLM tools (LangChain, Vercel AI SDK, OpenAI APIs) Experience building real-time apps (e.g., WebSockets) Understanding of authentication/authorization flows in web apps Knowledge of financial services, fintech, or enterprise-grade products This is a rare opportunity for a Senior Full Stack Engineer to More ❯

need: 5+ years' backend development experience (games industry preferred) Strong coding skills in C++, C#, Go, or Node.js (C C# ideal) Deep understanding of distributed systems, real-time networking (WebSockets, RPCs, REST, gRPC) Experience with cloud platforms (AWS, Azure, or GCP) Familiarity with matchmaking, player sessions, anti-cheat systems Database experience across SQL and NoSQL (PostgreSQL, Redis, MongoDB) Hands-on … being handled by Langham Recruitment Ltd. Langham Recruitment Ltd acts as an employment agency and is registered in England and Wales (reg 11525223). Keywords: C++, C#, Go, Node.js, WebSockets, RPCs, REST, gRPC, AWS, Azure, GCP, PostgreSQL, Redis, MongoDB, PlayFab, AccelByte, Nakama More ❯

need: 5+ years' backend development experience (games industry preferred) Strong coding skills in C++, C#, Go, or Node.js (C C# ideal) Deep understanding of distributed systems, real-time networking (WebSockets, RPCs, REST, gRPC) Experience with cloud platforms (AWS, Azure, or GCP) Familiarity with matchmaking, player sessions, anti-cheat systems Database experience across SQL and NoSQL (PostgreSQL, Redis, MongoDB) Hands-on … being handled by Langham Recruitment Ltd. Langham Recruitment Ltd acts as an employment agency and is registered in England and Wales (reg 11525223). Keywords: C++, C#, Go, Node.js, WebSockets, RPCs, REST, gRPC, AWS, Azure, GCP, PostgreSQL, Redis, MongoDB, PlayFab, AccelByte, Nakama More ❯

Responsibilities for the Founding iOS Tech Lead, SwiftUI | HealthTech, AI, Greenfield Start-up | Shoreditch, Hybrid | Up to £110,000 + Stocks & Benefits APIs & Communication: Strong understanding of REST, GraphQL, WebSockets, and API design best practices Ideally Fullstack TypeScript Engineer (across frontend and backend) Proven experience as a senior software engineer or tech lead, ideally in an early stage startup environment More ❯

Responsibilities for the Founding iOS Tech Lead, SwiftUI | HealthTech, AI, Greenfield Start-up | Shoreditch, Hybrid | Up to £110,000 + Stocks & Benefits APIs & Communication: Strong understanding of REST, GraphQL, WebSockets, and API design best practices Ideally Fullstack TypeScript Engineer (across frontend and backend) Proven experience as a senior software engineer or tech lead, ideally in an early stage startup environment More ❯

Responsibilities for the Founding iOS Tech Lead, SwiftUI | HealthTech, AI, Greenfield Start-up | Shoreditch, Hybrid | Up to £110,000 + Stocks & Benefits APIs & Communication: Strong understanding of REST, GraphQL, WebSockets, and API design best practices Ideally Fullstack TypeScript Engineer (across frontend and backend) Proven experience as a senior software engineer or tech lead, ideally in an early stage startup environment More ❯

Position: Front End JavaScript Developer Reports to: Front End Development Team Lead Hours: 40 hours Location: 3 days in North London office (Monday – Wednesday) Salary: £60 - £80,000 + eligibility for performance bonus Start date: ASAP Purpose of the role More ❯

Position: Front End JavaScript Developer Reports to: Front End Development Team Lead Hours: 40 hours Location: 3 days in North London office (Monday – Wednesday) Salary: £60 - £80,000 + eligibility for performance bonus Start date: ASAP Purpose of the role More ❯

building scalable front-end applications using Angular. Solid Solution Deisgn Experience. Nice-to-Have : Experience with Event-Driven Architecture using AWS services (SNS, SQS, EventBridge). Knowledge of GraphQL, WebSockets, or real-time data streaming. Exposure to DevOps and observability practices (e.g., Prometheus, Datadog, AWS CloudWatch, OpenTelemetry). Prior experience in leading distributed engineering teams. More ❯

building scalable front-end applications using Angular. Solid Solution Deisgn Experience. Nice-to-Have : Experience with Event-Driven Architecture using AWS services (SNS, SQS, EventBridge). Knowledge of GraphQL, WebSockets, or real-time data streaming. Exposure to DevOps and observability practices (e.g., Prometheus, Datadog, AWS CloudWatch, OpenTelemetry). Prior experience in leading distributed engineering teams. 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 ❯

/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 ❯

strong full stack engineer, proficient in TypeScript or JavaScript and Python. You have experience building high-performance, responsive web applications, and a deep understanding of HTTP protocols, REST APIs, WebSockets, and the DOM. You are comfortable operating across the stack, with strong knowledge of relational databases, web security best practices, and authentication. You have experience architecting distributed systems and deploying More ❯

strong full stack engineer, proficient in TypeScript or JavaScript and Python. You have experience building high-performance, responsive web applications, and a deep understanding of HTTP protocols, REST APIs, WebSockets, and the DOM. You are comfortable operating across the stack, with strong knowledge of relational databases, web security best practices, and authentication. You have experience architecting distributed systems and deploying More ❯

Senior Frontend Engineer | FinTech/DeFi | Up to £120,000 p/a + Bonus + Liquid Equity 💻 Senior Frontend Engineer - Up to £120,000 per annum 🚀Rising player in Decentralised Finance (DeFi) 💰Up to £120,000 p/a More ❯

Senior Frontend Engineer | FinTech/DeFi | Up to £120,000 p/a + Bonus + Liquid Equity 💻 Senior Frontend Engineer - Up to £120,000 per annum 🚀Rising player in Decentralised Finance (DeFi) 💰Up to £120,000 p/a More ❯

developing with: Relational databases (PostgreSQL, MySQL, etc.) OpenSearch DynamoDB S3 Event-driven architectures Third-party API integration Access control and user permissions Implementing APIs used by single-page applications WebSockets Infrastructure as code (AWS CDK, Terraform, etc.) Docker AWS IoT What we’re looking for Circa 2 years of commercial or equivalent experience in a software development role building cloud More ❯

developing with: Relational databases (PostgreSQL, MySQL, etc.) OpenSearch DynamoDB S3 Event-driven architectures Third-party API integration Access control and user permissions Implementing APIs used by single-page applications WebSockets Infrastructure as code (AWS CDK, Terraform, etc.) Docker AWS IoT What we’re looking for Circa 2 years of commercial or equivalent experience in a software development role building cloud More ❯

Role Overview As a quantitative developer, you will play a pivotal role in building and optimising our quant trading systems, backtesting infrastructure, and research tools. You will collaborate closely with quantitative researchers, traders, and engineers to translate complex financial models More ❯