Lead UI Developer role using TypeScript, React, RxJS, WebSockets/SSE, GraphQL, Protobuf, Flatbuffers, Jest/Vitest, React Testing Library, Playwright, and AG Grid. You will own the front-end architecture for a real-time Single Dealer Platform used by Sales, Trading, and institutional clients globally, building low-latency trading applications for market data, pricing, RFQ, and trade capture.

Lead Software Engineer for the PRIIP Cloud platform, owning full-stack development with TypeScript/Node.js, React, Java/Kotlin, REST APIs, event-driven architectures, AWS, Docker, and Kubernetes. The team builds a cloud-based PRIIP documentation and reporting system for regulated financial services, collaborating with compliance, quant, and product specialists. This role leads a multidisciplinary team of engineers and subject matter experts.

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.

You will build and operate a Kubernetes platform on Azure using Terraform, GitOps, service mesh, and observability tools like Grafana and OpenTelemetry. The platform underpins AI and automation services for a large-scale enterprise, supporting multiple engineering teams. This is a hands-on role covering infrastructure as code, CI/CD, networking, and platform reliability.

You will work with AWS, Kubernetes, Python, Go or Node.js, CI/CD tools, and OpenTelemetry or Datadog. The role involves platform engineering and DevOps, focusing on cloud-native architectures, automation, and observability.

The Infrastructure Reliability Engineering Lead will lead a team of specialist engineers, implementing reliability engineering practices across infrastructure platforms for LME industrial metals trading and clearing services. The role focuses on observability, resilience engineering, automation, operational readiness, and service reliability improvement.

Python (3.10+) and Go development, with JavaScript/TypeScript for frontend; using RabbitMQ, Kafka, PostgreSQL, Redis, OpenTelemetry, and Prometheus. You will build and maintain low-latency real-time data feeds and web scraping pipelines to expand access to liquidity providers for sports prediction models.

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.

You will own the C++17+ systems that ingest, process, and store high-rate sensor data from metal 3D printers, serving physics-informed ML inference and 3D insights in production. The work involves Python bindings (via pybind11), WebSockets, CMake, 3D geometry/meshes, and on-premise deployment. Nexus is an early-stage startup building the data and software layers for additive manufacturing of safety-critical parts.

9fin★0.0· London

Build tools, services, APIs, and CLIs on AWS with Terraform. Improve CI/CD, observability (OpenTelemetry, CloudWatch, SigNoz), and development workflows for 9fin's engineering teams. You join the established Platform team to create paved roads and self-service capabilities that accelerate and simplify software delivery.

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 work with Azure (AI Foundry, AI Search, Cosmos DB, API Management, observability), Langfuse, Datadog, LiteLLM, MCP gateways, contemporary AI models, agent harnesses (Claude Code, Codex, GitHub Copilot), OpenTelemetry, LangChain, LangGraph, and Azure document-processing services. The team builds and experiments with AI agents and retrieval-augmented generation (RAG) systems at LSEG, a global financial markets infrastructure and data company. The role is at the Manager career stage.

LSEG★3.7 (402)· London

Work with Azure (AI Foundry, AI Search, Cosmos DB, APIM, observability), Langfuse, Datadog, RAG, vector databases, LiteLLM, MCP, contemporary AI models, Claude Code, Codex, GitHub Copilot, OpenTelemetry, LangChain/LangGraph, and Azure AI Document Intelligence. The role is within LSEG, a global financial markets infrastructure and data business. This is

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.

Dynatrace★4.2 (100)· London

You will evangelize Dynatrace's telemetry pipeline using Bindplane, OpenTelemetry, Fluentd, Logstash, Fluent Bit, event-streaming (Kafka, Kinesis, Pub/Sub) and cloud-native ecosystems (AWS, Azure, GCP, Kubernetes). The role drives adoption of Dynatrace's AI-powered observability and security platform, advising on data routing and analytics. You will partner with Global Sales and Customer Success teams in a specialist pre-sales capacity.

You will work with AWS and Amazon EKS, automating infrastructure with Terraform and building CI/CD with GitHub Actions, GitLab CI/CD, ArgoCD, and GitOps. Scripting is in Python and Bash/Shell, using Helm, Kustomize, Prometheus, Grafana, and the ELK stack. The team supports production AWS/EKS environments for a leading gaming company.

U.S. Bank★3.5 (12k)· London

Work with CI/CD (GitLab, Jenkins, Harness), Terraform, AWS (ECS/EKS, Lambda, S3, IAM), Docker, Kubernetes, OpenTelemetry, CloudWatch, and Python/Bash. You own the deployment, operations, and reliability of the AI‑SDLC platform as it transitions from local execution to a centralized, hosted enterprise service.

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.

You'll build Python-based backend services and data pipelines with Docker, Kubernetes, and Terraform, integrating enterprise systems like SAP and Oracle ERP while handling multi-terabyte datasets. Magentic develops agentic AI systems for supply chain and procurement workflows, targeting enterprise customers with end-to-end feature ownership from architecture through deployment and iteration.

Build and manage CI/CD pipelines (GitLab/Jenkins/Harness), infrastructure as code (Terraform), and AWS cloud services (ECS/EKS, Lambda, S3) with Docker and Kubernetes for the AI‑SDLC platform. Ensure platform reliability, monitoring (OpenTelemetry, CloudWatch), and operational support, while driving the centralized, hosted enterprise service through automation and security compliance. This role is within the team at Elavon, a U.S. Bank subsidiary building tailored payment solutions.

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.