Zoopla★3.9 (18)· London

A 12-month maternity cover role on a dual-stack C#, .NET, and TypeScript backend with React microfrontends, using AWS managed services (ECS/Fargate, Lambda, SQS, DynamoDB, DocumentDB) and Terraform/SST. You'll build B2B SaaS software for estate agents and home builders at Alto Software Group. Take end-to-end ownership of features from design to production, working with the product team and AI coding agents.

You'll work with TypeScript, Node.js, AWS serverless technologies (Lambda, SQS, EventBridge, API Gateway), MongoDB, Terraform, and GitHub Actions. Seccl is an embedded investment platform helping people invest better, owned by Octopus. You'll design and operate services within cross-functional squads, mentor engineers, and support regulated investment operations in a build-and-run model.

American Express★4.1 (9.7k)· London

You will work with Kotlin/JVM, Java, React, Postgres, MongoDB, Redis, Docker, Kubernetes, and GitHub Actions. The Financial Insights and Tools group builds financial analysis software for American Express customers, powered by APIs and underlying platforms for web and mobile applications.

Work with Kotlin/JVM, Java, React, APIs, Postgres, MongoDB, Redis, Docker, Kubernetes, GCP GKE, AWS ECS/EKS, Ktor, Spring, and GitHub Actions. The Financial Insights and Tools group builds customer-facing web and mobile features that aggregate and analyze financial data to enhance personal finance management.

American Express★4.1 (9.7k)· London

Work with Kotlin/JVM, Java, React, Postgres, MongoDB, Redis, Docker, Kubernetes (GCP GKE, AWS ECS/EKS), GitHub Actions, Ktor, and Spring. The Financial Insights and Tools group within Digital Banking builds financial analysis and planning applications for American Express customers on web and mobile, powered by APIs.

Senior Engineer will work with React Native, TypeScript, Kotlin, Python, PostgreSQL, AWS, and Terraform to build internal tooling for finance, treasury, and operations. The team supports Taptap Send’s cross-border fintech platform for emerging markets.

State Street★3.4 (3k)· London

You will work with ReactJS, NextJS, TypeScript, NodeJS, Java, Spring Boot, Docker, and AWS to build cloud-native microservices. The role involves modernizing legacy platforms and developing enterprise-scale applications for a financial services firm. You will also mentor junior developers.

Work with Java/Kotlin/JVM, Postgres, MongoDB, Redis, Docker, Kubernetes, GCP GKE, AWS ECS/EKS, GitHub Actions, and frameworks like Ktor and Spring. You'll handle end-to-end delivery of green-field and brown-field software projects, collaborating with customers and product teams.

You will work with Vue.js, React, C#/.NET (or Java/Kotlin/Go), SQL, AWS (SQS, DynamoDB, S3, ECS, Lambda), CI/CD, and agentic coding tools like Copilot, Cursor, or Claude Code. You will design and modernize the platform layer for Xe’s cross-border payments platform, owning features across onboarding, KYC, FX, and settlement. You will lead delivery, mentor mid-level engineers, and partner with architects, working in a small engineering team.

Viasat★3.8 (382)· London

Work with Python, AWS Lambda, Next.js/React, Terraform, and BigQuery to architect data-driven platforms that drive Viasat's revenue growth by transforming how commercial and customer-facing teams operate. Co-lead development of web portals and cloud applications, integrating AI capabilities like LLMs and agent frameworks. Join an existing Senior Solutions Architect to share technical ownership of the platform ecosystem.

You'll set technical direction for a squad modernising a billing pipeline using TypeScript, Node.js, NestJS, PHP 8.x, Symfony, RabbitMQ, Kafka, SQS, PostgreSQL, GitLab CI/CD, and Grafana. The Interstellar Squad owns the mission-critical, event-driven billing run for Wireless Logic’s IoT connectivity platform.

This role requires expert-level Python, Java, Kotlin, and Typescript to build APIs (REST, GraphQL, gRPC) within microservices, distributed systems, and event-driven architectures on AWS (Lambda, ECS, DynamoDB, SQS, S

You will refactor Java & Angular applications into AWS cloud-native microservices using Java 11+/17, Spring Boot, and REST APIs, deploying via AWS (EKS/ECS, EC2, Lambda, S3, RDS, CloudWatch). You will build CI/CD pipelines with Docker, Kubernetes, Git, and Jenkins/GitLab within a leading financial organisation’s large-scale cloud transformation projects.

You will work with Kotlin (or Java), SQL, React, TypeScript, Redux, Tailwind, AWS/GCP/Azure, Terraform, Docker, and Kubernetes. You will design and build backend services for a large-scale marketing platform and machine learning platform for a global telecommunications client.

Lyst★3.0 (1)· London

You'll build and maintain affiliate platforms, data pipelines, bidding systems, and integrations using Python, Django, AWS, Docker, ECS, PostgreSQL, Redis, Snowflake, SQS, and SNS. The Affiliate Operations squad develops technology that connects shoppers with fashion brands, driving customer acquisition, partner integrations, and revenue growth.

Build full-stack applications with TypeScript, React, NestJS, Prisma, PostgreSQL, and AWS on the Reap Direct team, which develops client-facing web and mobile platforms for stablecoin-powered corporate cards, payments, and expense management tools.

You will work with C#, .NET, AWS (EC2, RDS, Lambda, S3), SQL Server, PostgreSQL, xUnit, GitHub, TeamCity, and Octopus Deploy. As a senior engineer at a UK insurance broker, you will drive TDD adoption and build an agentic AI development workflow. This is not a management role.

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.

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.

JPMorgan★3.9 (20k)· London

Uses Java, Spring, Springboot, React, Kafka, Python, Databricks, Spark, AWS, and AI development tools to build real-time trade processing applications for financial markets, Futures & Options, and Trade Execution/Clearing. Leads engineering teams, defining the technology roadmap for next-generation data, analytics, and automation platforms.

Ebury★3.3 (13)· London

Build an AI-powered financial crime investigation platform using React, TypeScript, FastAPI, Python, LangGraph, LlamaIndex, and AWS (Bedrock, ECS, DynamoDB, OpenSearch). Design AI agent workflows and micro-frontend architecture while mentoring engineers.

Ebury★3.3 (13)· London

You will work with React 19, TypeScript, Material-UI, Python 3.13, FastAPI, LangGraph, AWS Bedrock, DynamoDB, OpenSearch, Terraform, GitHub Actions, Docker, and Kubernetes. The team is building an AI-powered financial crime investigation platform that automates screening for compliance teams. This is a full-stack, individual-contributor role.

Elliptic★0.0· London

You'll design and build agentic workflows using LangChain or LangGraph, develop backend services in TypeScript and Node.js, and create evaluation frameworks for LLM outputs. Elliptic builds AI-powered compliance tools that help investigators trace blockchain fund flows and detect financial crime. You'll lead the AI team's technical direction, mentor junior engineers, and own significant features from design through production.

Work with Python, AWS (S3, ECR, ECS/EKS), Terraform, GitHub Actions, React, TypeScript, and LLM APIs (Gemini, Claude, OpenAI). Build a neurosymbolic AI platform combining symbolic reasoning (decision trees, knowledge graphs) with LLMs for audit, compliance, and financial services, transitioning from bespoke engagements to a scalable public API. As a Staff Engineer, drive architecture and engineering quality across cross-functional squads.

Universal Music Group★4.0 (408)· London

The Senior Developer will work with modern .NET, C#, React.js, TypeScript, AWS services, PostgreSQL, and containerization tools (ECS/Kubernetes) while building CI/CD pipelines using GitHub Actions or similar. You'll develop and maintain front-end and back-end solutions for Universal Music Group's Rights Product & Services Team, which manages technical systems for music contracts and repertoire assignment across their global operations. Working in an agile team with product owners, developers, and DevOps engineers, you'll ensure secure, performant solutions while diagnosing issues using tools like Dynatrace.