Lovable★4.0 (43)· London

Uses Go, Rust, TypeScript; AWS, Azure, Google Cloud, Cloudflare; Kubernetes, Terraform, Temporal, OTEL, CI/CD; PostgreSQL, ClickHouse, Firestore, Spanner, BigQuery. Builds the platform for Lovable Enterprise enabling secure, cloud-agnostic deployment, defining architecture for sandboxing, networking, encryption, identity, and mentoring engineers.

DeepL★3.8 (4)· London

Work with React, TypeScript, Node.js, WebRTC, WebSockets, and streaming architectures. You will join DeepL Voice, building real-time interpretation features for fluid conversations and audio streams. This is a 0-to-1 engineering environment in a cross-functional squad.

Lovable★4.0 (43)· London

Build enterprise deployments using Go, Rust, and TypeScript on AWS, Azure, and Google Cloud, with Kubernetes, Terraform, and Temporal. You will build the platform that allows large customers to run Lovable securely and at scale across every major cloud provider.

HCLTech★3.7 (11k)· London

Work with React, TypeScript, HTML, CSS, JavaScript, Redux, WebSockets, SSE, REST APIs, micro-frontends, and unit testing tools like Jest/React Testing Library. The role delivers high-availability, low-latency UI applications, ideally for financial services or trading platforms.

You will work with React, TypeScript, HTML, CSS, JavaScript, WebSockets, SSE, REST APIs, Redux, micro-frontends, SPA, React Testing Library/Jest, and optionally Playwright or Cypress. The role involves building time-critical, high-availability, high-performance UI applications, with an advantage for experience in financial services or trading platforms.

Cognizant★3.8 (17k)· London

You will work with Python (FastAPI/Flask), serverless architecture, NextJS/React, third-party APIs, OAuth/JWT, and WebSockets. You will design, build, and enhance the Digital Onboarding Service used across the API Platform.

You will build frontend applications using React and TypeScript, develop reusable UI components, and work on real-time features with WebSockets and GraphQL. The company builds a suite of real-time products for enterprise customers in specialized financial markets. The small, experienced engineering team offers significant ownership from day one.

React developer role using React, TypeScript, JavaScript, HTML, CSS, Redux, WebSockets, SSE, REST APIs, React Testing Library and Jest, with optional Playwright or Cypress. You will build time-critical, high-availability, high-performance UI applications, working across the full development lifecycle.

You will build frontend applications with React, TypeScript, JavaScript (ES6+), GraphQL/Apollo, Material UI, and WebSockets. This is for an early-stage company creating a real-time platform for enterprise financial markets, where you will own features alongside product and backend engineers. The team is small and experienced.

You will work with Vue.js, Vuex, Pinia, Vite, TypeScript, and real-time data tools (WebSockets, SSE) to build high-performance trading UIs. The role is on the team that continuously improves Interactive Brokers’ critical platform for automated trade execution and custody across global markets.

Grid Dynamics★3.4 (19)· London

Build high-performance React and TypeScript trading applications using WebSockets, RSocket, and streaming market data. Work within an embedded team modernising a Tier 1 investment bank’s electronic trading platforms, migrating legacy Angular apps to React. Collaborate with backend Java engineers on mission-critical front-office systems.

You will work with Ruby on Rails, PostgreSQL, Redis, Sidekiq, Vue.js, AWS, Docker, GitLab, and Cloudflare. You will take ownership of core product development, platform improvements and technical decision-making for a SaaS platform in the health, fitness and coaching technology sector.

TypeScript, Python, Rust, React, C++, Docker, and Kubernetes. You will build scalable software across Emotech’s AI products and customer platforms, productionising AI prototypes and models from the company’s speech and multimodal research teams.

Angular, .NET and Legacy ASP.NET MVC, WebSockets, SQL Server, XL Deploy, XL Release, GIT, and Jira are used for full-stack development. The team builds and maintains front-end web applications for investment banking, ensuring performance and code quality, while mentoring new developers.

React, TypeScript, AG Grid, RxJS, WebSockets, and OpenFin are used to build a new modular UI layer and real-time trading applications for G10 Rates front-office trading.

Use Kotlin Multiplatform (KMP), Flutter, or React Native; integrate TFLite/CoreML and real-time protocols (WebSockets, SSE). You'll build consumer-facing mobile apps and client SDKs for behavioral AI retail solutions, collaborating with ML engineers and product designers.

You'll use Python/Java/Go, React/TypeScript, Postgres, Mongo, Redis, WebSockets, SSE, Kafka/Pulsar or RabbitMQ, and AI tools like Claude/Copilot. You'll build real-time web interfaces and event-driven backend services for a stealth-mode VC-backed company creating behavioural AI to redefine in-store retail experiences.

TP ICAP★3.1 (34)· London

You will work with C#, TypeScript, React, SQL, RESTful APIs, AWS, Docker/Kubernetes, GitLab CI/CD, and microservices to design and maintain full-stack applications. The team builds scalable applications powering critical business functions within TP ICAP, a global interdealer broker providing market infrastructure and data solutions.

Design and build production-grade multi-agent AI workflows and stateful systems using Google ADK, LangChain, LangGraph, Python, React, Next.js or Vue, with secure Python APIs, Docker, and WebSockets. The role creates responsive frontends for interacting with complex AI orchestrations and deterministic AI engines.

You'll work with Python (FastAPI), Go, TypeScript, PostgreSQL, Redis, Pinecone/pgvector, AWS (ECS, Lambda, SQS), Docker, Kubernetes, Terraform, LangChain/LlamaIndex, vLLM, and Anthropic/OpenAI APIs. You'll build and optimize RAG pipelines, real-time inference APIs, and vector search infrastructure powering LLM features for 500k+ monthly active users.

Java, React (Vite, NX), Kafka/Solace/RabbitMQ, WebSockets/SSE, Rx, Kubernetes, and SQL drive a multi-year platform modernisation building real-time, low-latency, high-performance microservices for front office trading. You will combine hands-on engineering with technical leadership, shaping architecture and engineering standards.

Smarkets★5.0 (2)· London

Build web and mobile apps with Next.js, React, React Native, TypeScript, Redux, React Query, WebSockets, and REST APIs, using Figma for design and GitLab with Kubernetes for DevOps. You will craft polished interfaces for Smarkets, which operates one of the world’s most sophisticated prediction markets for sports and political events.

Ebury★3.3 (13)· London

You will work with React, TypeScript, Python, FastAPI, Strands Agents SDK, AWS Bedrock, RAG, Ragas, Langfuse, AWS/GCP, Terraform, and Docker. You will build Flow, an internal AI agent platform that orchestrates multi-step workflows across data warehouses and services to automate business operations. The role involves end-to-end ownership of agent workflows, reasoning UIs, and cross-system integrations.

Lead a team building scalable web applications with TypeScript, React, and Redux, integrating AI features at Agoda. Work with REST, GraphQL, WebSockets, and modern frontend architecture including SSR and micro-frontends. The team develops user-facing platforms that power global-scale travel experiences.

Senior UI Platform Engineer role at Jain Global using React, TypeScript, Vite, Next.js, Ant Design, AG Grid, Datadog, OpenTelemetry, Grafana, Microsoft Entra ID/Azure AD, and npm packages. The Core Platform team builds reusable frontend foundations—shared UI packages, application scaffolding, authentication/authorization integration, developer tooling, and internal platform applications (onboarding, access, service discovery).